diff options
| -rw-r--r-- | arch/arm64/include/asm/unistd.h | 1 | ||||
| -rw-r--r-- | arch/arm64/include/asm/unistd32.h | 2 | ||||
| -rw-r--r-- | arch/x86/entry/syscalls/syscall_32.tbl | 2 | ||||
| -rw-r--r-- | arch/x86/include/asm/unistd.h | 1 | ||||
| -rw-r--r-- | fs/compat.c | 1191 | ||||
| -rw-r--r-- | fs/fcntl.c | 157 | ||||
| -rw-r--r-- | fs/fhandle.c | 13 | ||||
| -rw-r--r-- | fs/internal.h | 2 | ||||
| -rw-r--r-- | fs/open.c | 20 | ||||
| -rw-r--r-- | fs/read_write.c | 75 | ||||
| -rw-r--r-- | fs/readdir.c | 165 | ||||
| -rw-r--r-- | fs/select.c | 421 | ||||
| -rw-r--r-- | fs/stat.c | 86 | ||||
| -rw-r--r-- | fs/statfs.c | 140 | ||||
| -rw-r--r-- | fs/utimes.c | 66 | ||||
| -rw-r--r-- | include/linux/compat.h | 5 | ||||
| -rw-r--r-- | include/linux/poll.h | 56 | ||||
| -rw-r--r-- | include/uapi/asm-generic/unistd.h | 3 |
18 files changed, 1139 insertions, 1267 deletions
diff --git a/arch/arm64/include/asm/unistd.h b/arch/arm64/include/asm/unistd.h index bdbeb06dc11e..a0baa9af5487 100644 --- a/arch/arm64/include/asm/unistd.h +++ b/arch/arm64/include/asm/unistd.h @@ -14,7 +14,6 @@ * along with this program. If not, see <http://www.gnu.org/licenses/>. */ #ifdef CONFIG_COMPAT -#define __ARCH_WANT_COMPAT_SYS_GETDENTS64 #define __ARCH_WANT_COMPAT_STAT64 #define __ARCH_WANT_SYS_GETHOSTNAME #define __ARCH_WANT_SYS_PAUSE diff --git a/arch/arm64/include/asm/unistd32.h b/arch/arm64/include/asm/unistd32.h index c66b51aab195..ef292160748c 100644 --- a/arch/arm64/include/asm/unistd32.h +++ b/arch/arm64/include/asm/unistd32.h @@ -456,7 +456,7 @@ __SYSCALL(__NR_setfsuid32, sys_setfsuid) #define __NR_setfsgid32 216 __SYSCALL(__NR_setfsgid32, sys_setfsgid) #define __NR_getdents64 217 -__SYSCALL(__NR_getdents64, compat_sys_getdents64) +__SYSCALL(__NR_getdents64, sys_getdents64) #define __NR_pivot_root 218 __SYSCALL(__NR_pivot_root, sys_pivot_root) #define __NR_mincore 219 diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl index 0af59fa789ea..448ac2161112 100644 --- a/arch/x86/entry/syscalls/syscall_32.tbl +++ b/arch/x86/entry/syscalls/syscall_32.tbl @@ -226,7 +226,7 @@ 217 i386 pivot_root sys_pivot_root 218 i386 mincore sys_mincore 219 i386 madvise sys_madvise -220 i386 getdents64 sys_getdents64 compat_sys_getdents64 +220 i386 getdents64 sys_getdents64 221 i386 fcntl64 sys_fcntl64 compat_sys_fcntl64 # 222 is unused # 223 is unused diff --git a/arch/x86/include/asm/unistd.h b/arch/x86/include/asm/unistd.h index 32712a925f26..1ba1536f627e 100644 --- a/arch/x86/include/asm/unistd.h +++ b/arch/x86/include/asm/unistd.h @@ -23,7 +23,6 @@ # include <asm/unistd_64.h> # include <asm/unistd_64_x32.h> # define __ARCH_WANT_COMPAT_SYS_TIME -# define __ARCH_WANT_COMPAT_SYS_GETDENTS64 # define __ARCH_WANT_COMPAT_SYS_PREADV64 # define __ARCH_WANT_COMPAT_SYS_PWRITEV64 # define __ARCH_WANT_COMPAT_SYS_PREADV64V2 diff --git a/fs/compat.c b/fs/compat.c index c61b506f5bc9..190b38b39d9e 100644 --- a/fs/compat.c +++ b/fs/compat.c @@ -15,555 +15,14 @@ * published by the Free Software Foundation. */ -#include <linux/stddef.h> -#include <linux/kernel.h> -#include <linux/linkage.h> #include <linux/compat.h> -#include <linux/errno.h> -#include <linux/time.h> -#include <linux/cred.h> -#include <linux/fs.h> -#include <linux/fcntl.h> -#include <linux/namei.h> -#include <linux/file.h> -#include <linux/fdtable.h> -#include <linux/vfs.h> -#include <linux/ioctl.h> -#include <linux/init.h> #include <linux/ncp_mount.h> #include <linux/nfs4_mount.h> #include <linux/syscalls.h> -#include <linux/ctype.h> -#include <linux/dirent.h> -#include <linux/fsnotify.h> -#include <linux/highuid.h> -#include <linux/personality.h> -#include <linux/rwsem.h> -#include <linux/tsacct_kern.h> -#include <linux/security.h> -#include <linux/highmem.h> -#include <linux/signal.h> -#include <linux/poll.h> -#include <linux/mm.h> -#include <linux/fs_struct.h> #include <linux/slab.h> -#include <linux/pagemap.h> -#include <linux/aio.h> - #include <linux/uaccess.h> -#include <asm/mmu_context.h> -#include <asm/ioctls.h> #include "internal.h" -/* - * Not all architectures have sys_utime, so implement this in terms - * of sys_utimes. - */ -COMPAT_SYSCALL_DEFINE2(utime, const char __user *, filename, - struct compat_utimbuf __user *, t) -{ - struct timespec tv[2]; - - if (t) { - if (get_user(tv[0].tv_sec, &t->actime) || - get_user(tv[1].tv_sec, &t->modtime)) - return -EFAULT; - tv[0].tv_nsec = 0; - tv[1].tv_nsec = 0; - } - return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0); -} - -COMPAT_SYSCALL_DEFINE4(utimensat, unsigned int, dfd, const char __user *, filename, struct compat_timespec __user *, t, int, flags) -{ - struct timespec tv[2]; - - if (t) { - if (compat_get_timespec(&tv[0], &t[0]) || - compat_get_timespec(&tv[1], &t[1])) - return -EFAULT; - - if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT) - return 0; - } - return do_utimes(dfd, filename, t ? tv : NULL, flags); -} - -COMPAT_SYSCALL_DEFINE3(futimesat, unsigned int, dfd, const char __user *, filename, struct compat_timeval __user *, t) -{ - struct timespec tv[2]; - - if (t) { - if (get_user(tv[0].tv_sec, &t[0].tv_sec) || - get_user(tv[0].tv_nsec, &t[0].tv_usec) || - get_user(tv[1].tv_sec, &t[1].tv_sec) || - get_user(tv[1].tv_nsec, &t[1].tv_usec)) - return -EFAULT; - if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 || - tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0) - return -EINVAL; - tv[0].tv_nsec *= 1000; - tv[1].tv_nsec *= 1000; - } - return do_utimes(dfd, filename, t ? tv : NULL, 0); -} - -COMPAT_SYSCALL_DEFINE2(utimes, const char __user *, filename, struct compat_timeval __user *, t) -{ - return compat_sys_futimesat(AT_FDCWD, filename, t); -} - -static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf) -{ - struct compat_stat tmp; - - if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev)) - return -EOVERFLOW; - - memset(&tmp, 0, sizeof(tmp)); - tmp.st_dev = old_encode_dev(stat->dev); - tmp.st_ino = stat->ino; - if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) - return -EOVERFLOW; - tmp.st_mode = stat->mode; - tmp.st_nlink = stat->nlink; - if (tmp.st_nlink != stat->nlink) - return -EOVERFLOW; - SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid)); - SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid)); - tmp.st_rdev = old_encode_dev(stat->rdev); - if ((u64) stat->size > MAX_NON_LFS) - return -EOVERFLOW; - tmp.st_size = stat->size; - tmp.st_atime = stat->atime.tv_sec; - tmp.st_atime_nsec = stat->atime.tv_nsec; - tmp.st_mtime = stat->mtime.tv_sec; - tmp.st_mtime_nsec = stat->mtime.tv_nsec; - tmp.st_ctime = stat->ctime.tv_sec; - tmp.st_ctime_nsec = stat->ctime.tv_nsec; - tmp.st_blocks = stat->blocks; - tmp.st_blksize = stat->blksize; - return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0; -} - -COMPAT_SYSCALL_DEFINE2(newstat, const char __user *, filename, - struct compat_stat __user *, statbuf) -{ - struct kstat stat; - int error; - - error = vfs_stat(filename, &stat); - if (error) - return error; - return cp_compat_stat(&stat, statbuf); -} - -COMPAT_SYSCALL_DEFINE2(newlstat, const char __user *, filename, - struct compat_stat __user *, statbuf) -{ - struct kstat stat; - int error; - - error = vfs_lstat(filename, &stat); - if (error) - return error; - return cp_compat_stat(&stat, statbuf); -} - -#ifndef __ARCH_WANT_STAT64 -COMPAT_SYSCALL_DEFINE4(newfstatat, unsigned int, dfd, - const char __user *, filename, - struct compat_stat __user *, statbuf, int, flag) -{ - struct kstat stat; - int error; - - error = vfs_fstatat(dfd, filename, &stat, flag); - if (error) - return error; - return cp_compat_stat(&stat, statbuf); -} -#endif - -COMPAT_SYSCALL_DEFINE2(newfstat, unsigned int, fd, - struct compat_stat __user *, statbuf) -{ - struct kstat stat; - int error = vfs_fstat(fd, &stat); - - if (!error) - error = cp_compat_stat(&stat, statbuf); - return error; -} - -static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf) -{ - - if (sizeof ubuf->f_blocks == 4) { - if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail | - kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL) - return -EOVERFLOW; - /* f_files and f_ffree may be -1; it's okay - * to stuff that into 32 bits */ - if (kbuf->f_files != 0xffffffffffffffffULL - && (kbuf->f_files & 0xffffffff00000000ULL)) - return -EOVERFLOW; - if (kbuf->f_ffree != 0xffffffffffffffffULL - && (kbuf->f_ffree & 0xffffffff00000000ULL)) - return -EOVERFLOW; - } - if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) || - __put_user(kbuf->f_type, &ubuf->f_type) || - __put_user(kbuf->f_bsize, &ubuf->f_bsize) || - __put_user(kbuf->f_blocks, &ubuf->f_blocks) || - __put_user(kbuf->f_bfree, &ubuf->f_bfree) || - __put_user(kbuf->f_bavail, &ubuf->f_bavail) || - __put_user(kbuf->f_files, &ubuf->f_files) || - __put_user(kbuf->f_ffree, &ubuf->f_ffree) || - __put_user(kbuf->f_namelen, &ubuf->f_namelen) || - __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) || - __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) || - __put_user(kbuf->f_frsize, &ubuf->f_frsize) || - __put_user(kbuf->f_flags, &ubuf->f_flags) || - __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare))) - return -EFAULT; - return 0; -} - -/* - * The following statfs calls are copies of code from fs/statfs.c and - * should be checked against those from time to time - */ -COMPAT_SYSCALL_DEFINE2(statfs, const char __user *, pathname, struct compat_statfs __user *, buf) -{ - struct kstatfs tmp; - int error = user_statfs(pathname, &tmp); - if (!error) - error = put_compat_statfs(buf, &tmp); - return error; -} - -COMPAT_SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct compat_statfs __user *, buf) -{ - struct kstatfs tmp; - int error = fd_statfs(fd, &tmp); - if (!error) - error = put_compat_statfs(buf, &tmp); - return error; -} - -static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf) -{ - if (sizeof(ubuf->f_bsize) == 4) { - if ((kbuf->f_type | kbuf->f_bsize | kbuf->f_namelen | - kbuf->f_frsize | kbuf->f_flags) & 0xffffffff00000000ULL) - return -EOVERFLOW; - /* f_files and f_ffree may be -1; it's okay - * to stuff that into 32 bits */ - if (kbuf->f_files != 0xffffffffffffffffULL - && (kbuf->f_files & 0xffffffff00000000ULL)) - return -EOVERFLOW; - if (kbuf->f_ffree != 0xffffffffffffffffULL - && (kbuf->f_ffree & 0xffffffff00000000ULL)) - return -EOVERFLOW; - } - if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) || - __put_user(kbuf->f_type, &ubuf->f_type) || - __put_user(kbuf->f_bsize, &ubuf->f_bsize) || - __put_user(kbuf->f_blocks, &ubuf->f_blocks) || - __put_user(kbuf->f_bfree, &ubuf->f_bfree) || - __put_user(kbuf->f_bavail, &ubuf->f_bavail) || - __put_user(kbuf->f_files, &ubuf->f_files) || - __put_user(kbuf->f_ffree, &ubuf->f_ffree) || - __put_user(kbuf->f_namelen, &ubuf->f_namelen) || - __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) || - __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) || - __put_user(kbuf->f_frsize, &ubuf->f_frsize) || - __put_user(kbuf->f_flags, &ubuf->f_flags) || - __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare))) - return -EFAULT; - return 0; -} - -COMPAT_SYSCALL_DEFINE3(statfs64, const char __user *, pathname, compat_size_t, sz, struct compat_statfs64 __user *, buf) -{ - struct kstatfs tmp; - int error; - - if (sz != sizeof(*buf)) - return -EINVAL; - - error = user_statfs(pathname, &tmp); - if (!error) - error = put_compat_statfs64(buf, &tmp); - return error; -} - -COMPAT_SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, compat_size_t, sz, struct compat_statfs64 __user *, buf) -{ - struct kstatfs tmp; - int error; - - if (sz != sizeof(*buf)) - return -EINVAL; - - error = fd_statfs(fd, &tmp); - if (!error) - error = put_compat_statfs64(buf, &tmp); - return error; -} - -/* - * This is a copy of sys_ustat, just dealing with a structure layout. - * Given how simple this syscall is that apporach is more maintainable - * than the various conversion hacks. - */ -COMPAT_SYSCALL_DEFINE2(ustat, unsigned, dev, struct compat_ustat __user *, u) -{ - struct compat_ustat tmp; - struct kstatfs sbuf; - int err = vfs_ustat(new_decode_dev(dev), &sbuf); - if (err) - return err; - - memset(&tmp, 0, sizeof(struct compat_ustat)); - tmp.f_tfree = sbuf.f_bfree; - tmp.f_tinode = sbuf.f_ffree; - if (copy_to_user(u, &tmp, sizeof(struct compat_ustat))) - return -EFAULT; - return 0; -} - -static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl) -{ - if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) || - __get_user(kfl->l_type, &ufl->l_type) || - __get_user(kfl->l_whence, &ufl->l_whence) || - __get_user(kfl->l_start, &ufl->l_start) || - __get_user(kfl->l_len, &ufl->l_len) || - __get_user(kfl->l_pid, &ufl->l_pid)) - return -EFAULT; - return 0; -} - -static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl) -{ - if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) || - __put_user(kfl->l_type, &ufl->l_type) || - __put_user(kfl->l_whence, &ufl->l_whence) || - __put_user(kfl->l_start, &ufl->l_start) || - __put_user(kfl->l_len, &ufl->l_len) || - __put_user(kfl->l_pid, &ufl->l_pid)) - return -EFAULT; - return 0; -} - -#ifndef HAVE_ARCH_GET_COMPAT_FLOCK64 -static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl) -{ - if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) || - __get_user(kfl->l_type, &ufl->l_type) || - __get_user(kfl->l_whence, &ufl->l_whence) || - __get_user(kfl->l_start, &ufl->l_start) || - __get_user(kfl->l_len, &ufl->l_len) || - __get_user(kfl->l_pid, &ufl->l_pid)) - return -EFAULT; - return 0; -} -#endif - -#ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64 -static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl) -{ - if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) || - __put_user(kfl->l_type, &ufl->l_type) || - __put_user(kfl->l_whence, &ufl->l_whence) || - __put_user(kfl->l_start, &ufl->l_start) || - __put_user(kfl->l_len, &ufl->l_len) || - __put_user(kfl->l_pid, &ufl->l_pid)) - return -EFAULT; - return 0; -} -#endif - -static unsigned int -convert_fcntl_cmd(unsigned int cmd) -{ - switch (cmd) { - case F_GETLK64: - return F_GETLK; - case F_SETLK64: - return F_SETLK; - case F_SETLKW64: - return F_SETLKW; - } - - return cmd; -} - -COMPAT_SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd, - compat_ulong_t, arg) -{ - mm_segment_t old_fs; - struct flock f; - long ret; - unsigned int conv_cmd; - - switch (cmd) { - case F_GETLK: - case F_SETLK: - case F_SETLKW: - ret = get_compat_flock(&f, compat_ptr(arg)); - if (ret != 0) - break; - old_fs = get_fs(); - set_fs(KERNEL_DS); - ret = sys_fcntl(fd, cmd, (unsigned long)&f); - set_fs(old_fs); - if (cmd == F_GETLK && ret == 0) { - /* GETLK was successful and we need to return the data... - * but it needs to fit in the compat structure. - * l_start shouldn't be too big, unless the original - * start + end is greater than COMPAT_OFF_T_MAX, in which - * case the app was asking for trouble, so we return - * -EOVERFLOW in that case. - * l_len could be too big, in which case we just truncate it, - * and only allow the app to see that part of the conflicting - * lock that might make sense to it anyway - */ - - if (f.l_start > COMPAT_OFF_T_MAX) - ret = -EOVERFLOW; - if (f.l_len > COMPAT_OFF_T_MAX) - f.l_len = COMPAT_OFF_T_MAX; - if (ret == 0) - ret = put_compat_flock(&f, compat_ptr(arg)); - } - break; - - case F_GETLK64: - case F_SETLK64: - case F_SETLKW64: - case F_OFD_GETLK: - case F_OFD_SETLK: - case F_OFD_SETLKW: - ret = get_compat_flock64(&f, compat_ptr(arg)); - if (ret != 0) - break; - old_fs = get_fs(); - set_fs(KERNEL_DS); - conv_cmd = convert_fcntl_cmd(cmd); - ret = sys_fcntl(fd, conv_cmd, (unsigned long)&f); - set_fs(old_fs); - if ((conv_cmd == F_GETLK || conv_cmd == F_OFD_GETLK) && ret == 0) { - /* need to return lock information - see above for commentary */ - if (f.l_start > COMPAT_LOFF_T_MAX) - ret = -EOVERFLOW; - if (f.l_len > COMPAT_LOFF_T_MAX) - f.l_len = COMPAT_LOFF_T_MAX; - if (ret == 0) - ret = put_compat_flock64(&f, compat_ptr(arg)); - } - break; - - default: - ret = sys_fcntl(fd, cmd, arg); - break; - } - return ret; -} - -COMPAT_SYSCALL_DEFINE3(fcntl, unsigned int, fd, unsigned int, cmd, - compat_ulong_t, arg) -{ - switch (cmd) { - case F_GETLK64: - case F_SETLK64: - case F_SETLKW64: - case F_OFD_GETLK: - case F_OFD_SETLK: - case F_OFD_SETLKW: - return -EINVAL; - } - return compat_sys_fcntl64(fd, cmd, arg); -} - -/* A write operation does a read from user space and vice versa */ -#define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ) - -ssize_t compat_rw_copy_check_uvector(int type, - const struct compat_iovec __user *uvector, unsigned long nr_segs, - unsigned long fast_segs, struct iovec *fast_pointer, - struct iovec **ret_pointer) -{ - compat_ssize_t tot_len; - struct iovec *iov = *ret_pointer = fast_pointer; - ssize_t ret = 0; - int seg; - - /* - * SuS says "The readv() function *may* fail if the iovcnt argument - * was less than or equal to 0, or greater than {IOV_MAX}. Linux has - * traditionally returned zero for zero segments, so... - */ - if (nr_segs == 0) - goto out; - - ret = -EINVAL; - if (nr_segs > UIO_MAXIOV) - goto out; - if (nr_segs > fast_segs) { - ret = -ENOMEM; - iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL); - if (iov == NULL) - goto out; - } - *ret_pointer = iov; - - ret = -EFAULT; - if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector))) - goto out; - - /* - * Single unix specification: - * We should -EINVAL if an element length is not >= 0 and fitting an - * ssize_t. - * - * In Linux, the total length is limited to MAX_RW_COUNT, there is - * no overflow possibility. - */ - tot_len = 0; - ret = -EINVAL; - for (seg = 0; seg < nr_segs; seg++) { - compat_uptr_t buf; - compat_ssize_t len; - - if (__get_user(len, &uvector->iov_len) || - __get_user(buf, &uvector->iov_base)) { - ret = -EFAULT; - goto out; - } - if (len < 0) /* size_t not fitting in compat_ssize_t .. */ - goto out; - if (type >= 0 && - !access_ok(vrfy_dir(type), compat_ptr(buf), len)) { - ret = -EFAULT; - goto out; - } - if (len > MAX_RW_COUNT - tot_len) - len = MAX_RW_COUNT - tot_len; - tot_len += len; - iov->iov_base = compat_ptr(buf); - iov->iov_len = (compat_size_t) len; - uvector++; - iov++; - } - ret = tot_len; - -out: - return ret; -} - struct compat_ncp_mount_data { compat_int_t version; compat_uint_t ncp_fd; @@ -744,653 +203,3 @@ COMPAT_SYSCALL_DEFINE5(mount, const char __user *, dev_name, out: return retval; } - -struct compat_old_linux_dirent { - compat_ulong_t d_ino; - compat_ulong_t d_offset; - unsigned short d_namlen; - char d_name[1]; -}; - -struct compat_readdir_callback { - struct dir_context ctx; - struct compat_old_linux_dirent __user *dirent; - int result; -}; - -static int compat_fillonedir(struct dir_context *ctx, const char *name, - int namlen, loff_t offset, u64 ino, - unsigned int d_type) -{ - struct compat_readdir_callback *buf = - container_of(ctx, struct compat_readdir_callback, ctx); - struct compat_old_linux_dirent __user *dirent; - compat_ulong_t d_ino; - - if (buf->result) - return -EINVAL; - d_ino = ino; - if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) { - buf->result = -EOVERFLOW; - return -EOVERFLOW; - } - buf->result++; - dirent = buf->dirent; - if (!access_ok(VERIFY_WRITE, dirent, - (unsigned long)(dirent->d_name + namlen + 1) - - (unsigned long)dirent)) - goto efault; - if ( __put_user(d_ino, &dirent->d_ino) || - __put_user(offset, &dirent->d_offset) || - __put_user(namlen, &dirent->d_namlen) || - __copy_to_user(dirent->d_name, name, namlen) || - __put_user(0, dirent->d_name + namlen)) - goto efault; - return 0; -efault: - buf->result = -EFAULT; - return -EFAULT; -} - -COMPAT_SYSCALL_DEFINE3(old_readdir, unsigned int, fd, - struct compat_old_linux_dirent __user *, dirent, unsigned int, count) -{ - int error; - struct fd f = fdget_pos(fd); - struct compat_readdir_callback buf = { - .ctx.actor = compat_fillonedir, - .dirent = dirent - }; - - if (!f.file) - return -EBADF; - - error = iterate_dir(f.file, &buf.ctx); - if (buf.result) - error = buf.result; - - fdput_pos(f); - return error; -} - -struct compat_linux_dirent { - compat_ulong_t d_ino; - compat_ulong_t d_off; - unsigned short d_reclen; - char d_name[1]; -}; - -struct compat_getdents_callback { - struct dir_context ctx; - struct compat_linux_dirent __user *current_dir; - struct compat_linux_dirent __user *previous; - int count; - int error; -}; - -static int compat_filldir(struct dir_context *ctx, const char *name, int namlen, - loff_t offset, u64 ino, unsigned int d_type) -{ - struct compat_linux_dirent __user * dirent; - struct compat_getdents_callback *buf = - container_of(ctx, struct compat_getdents_callback, ctx); - compat_ulong_t d_ino; - int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) + - namlen + 2, sizeof(compat_long_t)); - - buf->error = -EINVAL; /* only used if we fail.. */ - if (reclen > buf->count) - return -EINVAL; - d_ino = ino; - if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) { - buf->error = -EOVERFLOW; - return -EOVERFLOW; - } - dirent = buf->previous; - if (dirent) { - if (signal_pending(current)) - return -EINTR; - if (__put_user(offset, &dirent->d_off)) - goto efault; - } - dirent = buf->current_dir; - if (__put_user(d_ino, &dirent->d_ino)) - goto efault; - if (__put_user(reclen, &dirent->d_reclen)) - goto efault; - if (copy_to_user(dirent->d_name, name, namlen)) - goto efault; - if (__put_user(0, dirent->d_name + namlen)) - goto efault; - if (__put_user(d_type, (char __user *) dirent + reclen - 1)) - goto efault; - buf->previous = dirent; - dirent = (void __user *)dirent + reclen; - buf->current_dir = dirent; - buf->count -= reclen; - return 0; -efault: - buf->error = -EFAULT; - return -EFAULT; -} - -COMPAT_SYSCALL_DEFINE3(getdents, unsigned int, fd, - struct compat_linux_dirent __user *, dirent, unsigned int, count) -{ - struct fd f; - struct compat_linux_dirent __user * lastdirent; - struct compat_getdents_callback buf = { - .ctx.actor = compat_filldir, - .current_dir = dirent, - .count = count - }; - int error; - - if (!access_ok(VERIFY_WRITE, dirent, count)) - return -EFAULT; - - f = fdget_pos(fd); - if (!f.file) - return -EBADF; - - error = iterate_dir(f.file, &buf.ctx); - if (error >= 0) - error = buf.error; - lastdirent = buf.previous; - if (lastdirent) { - if (put_user(buf.ctx.pos, &lastdirent->d_off)) - error = -EFAULT; - else - error = count - buf.count; - } - fdput_pos(f); - return error; -} - -#ifdef __ARCH_WANT_COMPAT_SYS_GETDENTS64 - -struct compat_getdents_callback64 { - struct dir_context ctx; - struct linux_dirent64 __user *current_dir; - struct linux_dirent64 __user *previous; - int count; - int error; -}; - -static int compat_filldir64(struct dir_context *ctx, const char *name, - int namlen, loff_t offset, u64 ino, - unsigned int d_type) -{ - struct linux_dirent64 __user *dirent; - struct compat_getdents_callback64 *buf = - container_of(ctx, struct compat_getdents_callback64, ctx); - int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1, - sizeof(u64)); - u64 off; - - buf->error = -EINVAL; /* only used if we fail.. */ - if (reclen > buf->count) - return -EINVAL; - dirent = buf->previous; - - if (dirent) { - if (signal_pending(current)) - return -EINTR; - if (__put_user_unaligned(offset, &dirent->d_off)) - goto efault; - } - dirent = buf->current_dir; - if (__put_user_unaligned(ino, &dirent->d_ino)) - goto efault; - off = 0; - if (__put_user_unaligned(off, &dirent->d_off)) - goto efault; - if (__put_user(reclen, &dirent->d_reclen)) - goto efault; - if (__put_user(d_type, &dirent->d_type)) - goto efault; - if (copy_to_user(dirent->d_name, name, namlen)) - goto efault; - if (__put_user(0, dirent->d_name + namlen)) - goto efault; - buf->previous = dirent; - dirent = (void __user *)dirent + reclen; - buf->current_dir = dirent; - buf->count -= reclen; - return 0; -efault: - buf->error = -EFAULT; - return -EFAULT; -} - -COMPAT_SYSCALL_DEFINE3(getdents64, unsigned int, fd, - struct linux_dirent64 __user *, dirent, unsigned int, count) -{ - struct fd f; - struct linux_dirent64 __user * lastdirent; - struct compat_getdents_callback64 buf = { - .ctx.actor = compat_filldir64, - .current_dir = dirent, - .count = count - }; - int error; - - if (!access_ok(VERIFY_WRITE, dirent, count)) - return -EFAULT; - - f = fdget_pos(fd); - if (!f.file) - return -EBADF; - - error = iterate_dir(f.file, &buf.ctx); - if (error >= 0) - error = buf.error; - lastdirent = buf.previous; - if (lastdirent) { - typeof(lastdirent->d_off) d_off = buf.ctx.pos; - if (__put_user_unaligned(d_off, &lastdirent->d_off)) - error = -EFAULT; - else - error = count - buf.count; - } - fdput_pos(f); - return error; -} -#endif /* __ARCH_WANT_COMPAT_SYS_GETDENTS64 */ - -/* - * Exactly like fs/open.c:sys_open(), except that it doesn't set the - * O_LARGEFILE flag. - */ -COMPAT_SYSCALL_DEFINE3(open, const char __user *, filename, int, flags, umode_t, mode) -{ - return do_sys_open(AT_FDCWD, filename, flags, mode); -} - -/* - * Exactly like fs/open.c:sys_openat(), except that it doesn't set the - * O_LARGEFILE flag. - */ -COMPAT_SYSCALL_DEFINE4(openat, int, dfd, const char __user *, filename, int, flags, umode_t, mode) -{ - return do_sys_open(dfd, filename, flags, mode); -} - -#define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t)) - -static int poll_select_copy_remaining(struct timespec *end_time, void __user *p, - int timeval, int ret) -{ - struct timespec ts; - - if (!p) - return ret; - - if (current->personality & STICKY_TIMEOUTS) - goto sticky; - - /* No update for zero timeout */ - if (!end_time->tv_sec && !end_time->tv_nsec) - return ret; - - ktime_get_ts(&ts); - ts = timespec_sub(*end_time, ts); - if (ts.tv_sec < 0) - ts.tv_sec = ts.tv_nsec = 0; - - if (timeval) { - struct compat_timeval rtv; - - rtv.tv_sec = ts.tv_sec; - rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC; - - if (!copy_to_user(p, &rtv, sizeof(rtv))) - return ret; - } else { - struct compat_timespec rts; - - rts.tv_sec = ts.tv_sec; - rts.tv_nsec = ts.tv_nsec; - - if (!copy_to_user(p, &rts, sizeof(rts))) - return ret; - } - /* - * If an application puts its timeval in read-only memory, we - * don't want the Linux-specific update to the timeval to - * cause a fault after the select has completed - * successfully. However, because we're not updating the - * timeval, we can't restart the system call. - */ - -sticky: - if (ret == -ERESTARTNOHAND) - ret = -EINTR; - return ret; -} - -/* - * Ooo, nasty. We need here to frob 32-bit unsigned longs to - * 64-bit unsigned longs. - */ -static -int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset, - unsigned long *fdset) -{ - nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS); - if (ufdset) { - unsigned long odd; - - if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t))) - return -EFAULT; - - odd = nr & 1UL; - nr &= ~1UL; - while (nr) { - unsigned long h, l; - if (__get_user(l, ufdset) || __get_user(h, ufdset+1)) - return -EFAULT; - ufdset += 2; - *fdset++ = h << 32 | l; - nr -= 2; - } - if (odd && __get_user(*fdset, ufdset)) - return -EFAULT; - } else { - /* Tricky, must clear full unsigned long in the - * kernel fdset at the end, this makes sure that - * actually happens. - */ - memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t)); - } - return 0; -} - -static -int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset, - unsigned long *fdset) -{ - unsigned long odd; - nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS); - - if (!ufdset) - return 0; - - odd = nr & 1UL; - nr &= ~1UL; - while (nr) { - unsigned long h, l; - l = *fdset++; - h = l >> 32; - if (__put_user(l, ufdset) || __put_user(h, ufdset+1)) - return -EFAULT; - ufdset += 2; - nr -= 2; - } - if (odd && __put_user(*fdset, ufdset)) - return -EFAULT; - return 0; -} - - -/* - * This is a virtual copy of sys_select from fs/select.c and probably - * should be compared to it from time to time - */ - -/* - * We can actually return ERESTARTSYS instead of EINTR, but I'd - * like to be certain this leads to no problems. So I return - * EINTR just for safety. - * - * Update: ERESTARTSYS breaks at least the xview clock binary, so - * I'm trying ERESTARTNOHAND which restart only when you want to. - */ -int compat_core_sys_select(int n, compat_ulong_t __user *inp, - compat_ulong_t __user *outp, compat_ulong_t __user *exp, - struct timespec *end_time) -{ - fd_set_bits fds; - void *bits; - int size, max_fds, ret = -EINVAL; - struct fdtable *fdt; - long stack_fds[SELECT_STACK_ALLOC/sizeof(long)]; - - if (n < 0) - goto out_nofds; - - /* max_fds can increase, so grab it once to avoid race */ - rcu_read_lock(); - fdt = files_fdtable(current->files); - max_fds = fdt->max_fds; - rcu_read_unlock(); - if (n > max_fds) - n = max_fds; - - /* - * We need 6 bitmaps (in/out/ex for both incoming and outgoing), - * since we used fdset we need to allocate memory in units of - * long-words. - */ - size = FDS_BYTES(n); - bits = stack_fds; - if (size > sizeof(stack_fds) / 6) { - bits = kmalloc(6 * size, GFP_KERNEL); - ret = -ENOMEM; - if (!bits) - goto out_nofds; - } - fds.in = (unsigned long *) bits; - fds.out = (unsigned long *) (bits + size); - fds.ex = (unsigned long *) (bits + 2*size); - fds.res_in = (unsigned long *) (bits + 3*size); - fds.res_out = (unsigned long *) (bits + 4*size); - fds.res_ex = (unsigned long *) (bits + 5*size); - - if ((ret = compat_get_fd_set(n, inp, fds.in)) || - (ret = compat_get_fd_set(n, outp, fds.out)) || - (ret = compat_get_fd_set(n, exp, fds.ex))) - goto out; - zero_fd_set(n, fds.res_in); - zero_fd_set(n, fds.res_out); - zero_fd_set(n, fds.res_ex); - - ret = do_select(n, &fds, end_time); - - if (ret < 0) - goto out; - if (!ret) { - ret = -ERESTARTNOHAND; - if (signal_pending(current)) - goto out; - ret = 0; - } - - if (compat_set_fd_set(n, inp, fds.res_in) || - compat_set_fd_set(n, outp, fds.res_out) || - compat_set_fd_set(n, exp, fds.res_ex)) - ret = -EFAULT; -out: - if (bits != stack_fds) - kfree(bits); -out_nofds: - return ret; -} - -COMPAT_SYSCALL_DEFINE5(select, int, n, compat_ulong_t __user *, inp, - compat_ulong_t __user *, outp, compat_ulong_t __user *, exp, - struct compat_timeval __user *, tvp) -{ - struct timespec end_time, *to = NULL; - struct compat_timeval tv; - int ret; - - if (tvp) { - if (copy_from_user(&tv, tvp, sizeof(tv))) - return -EFAULT; - - to = &end_time; - if (poll_select_set_timeout(to, - tv.tv_sec + (tv.tv_usec / USEC_PER_SEC), - (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC)) - return -EINVAL; - } - - ret = compat_core_sys_select(n, inp, outp, exp, to); - ret = poll_select_copy_remaining(&end_time, tvp, 1, ret); - - return ret; -} - -struct compat_sel_arg_struct { - compat_ulong_t n; - compat_uptr_t inp; - compat_uptr_t outp; - compat_uptr_t exp; - compat_uptr_t tvp; -}; - -COMPAT_SYSCALL_DEFINE1(old_select, struct compat_sel_arg_struct __user *, arg) -{ - struct compat_sel_arg_struct a; - - if (copy_from_user(&a, arg, sizeof(a))) - return -EFAULT; - return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp), - compat_ptr(a.exp), compat_ptr(a.tvp)); -} - -static long do_compat_pselect(int n, compat_ulong_t __user *inp, - compat_ulong_t __user *outp, compat_ulong_t __user *exp, - struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask, - compat_size_t sigsetsize) -{ - compat_sigset_t ss32; - sigset_t ksigmask, sigsaved; - struct compat_timespec ts; - struct timespec end_time, *to = NULL; - int ret; - - if (tsp) { - if (copy_from_user(&ts, tsp, sizeof(ts))) - return -EFAULT; - - to = &end_time; - if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec)) - return -EINVAL; - } - - if (sigmask) { - if (sigsetsize != sizeof(compat_sigset_t)) - return -EINVAL; - if (copy_from_user(&ss32, sigmask, sizeof(ss32))) - return -EFAULT; - sigset_from_compat(&ksigmask, &ss32); - - sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP)); - sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved); - } - - ret = compat_core_sys_select(n, inp, outp, exp, to); - ret = poll_select_copy_remaining(&end_time, tsp, 0, ret); - - if (ret == -ERESTARTNOHAND) { - /* - * Don't restore the signal mask yet. Let do_signal() deliver - * the signal on the way back to userspace, before the signal - * mask is restored. - */ - if (sigmask) { - memcpy(¤t->saved_sigmask, &sigsaved, - sizeof(sigsaved)); - set_restore_sigmask(); - } - } else if (sigmask) - sigprocmask(SIG_SETMASK, &sigsaved, NULL); - - return ret; -} - -COMPAT_SYSCALL_DEFINE6(pselect6, int, n, compat_ulong_t __user *, inp, - compat_ulong_t __user *, outp, compat_ulong_t __user *, exp, - struct compat_timespec __user *, tsp, void __user *, sig) -{ - compat_size_t sigsetsize = 0; - compat_uptr_t up = 0; - - if (sig) { - if (!access_ok(VERIFY_READ, sig, - sizeof(compat_uptr_t)+sizeof(compat_size_t)) || - __get_user(up, (compat_uptr_t __user *)sig) || - __get_user(sigsetsize, - (compat_size_t __user *)(sig+sizeof(up)))) - return -EFAULT; - } - return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up), - sigsetsize); -} - -COMPAT_SYSCALL_DEFINE5(ppoll, struct pollfd __user *, ufds, - unsigned int, nfds, struct compat_timespec __user *, tsp, - const compat_sigset_t __user *, sigmask, compat_size_t, sigsetsize) -{ - compat_sigset_t ss32; - sigset_t ksigmask, sigsaved; - struct compat_timespec ts; - struct timespec end_time, *to = NULL; - int ret; - - if (tsp) { - if (copy_from_user(&ts, tsp, sizeof(ts))) - return -EFAULT; - - to = &end_time; - if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec)) - return -EINVAL; - } - - if (sigmask) { - if (sigsetsize != sizeof(compat_sigset_t)) - return -EINVAL; - if (copy_from_user(&ss32, sigmask, sizeof(ss32))) - return -EFAULT; - sigset_from_compat(&ksigmask, &ss32); - - sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP)); - sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved); - } - - ret = do_sys_poll(ufds, nfds, to); - - /* We can restart this syscall, usually */ - if (ret == -EINTR) { - /* - * Don't restore the signal mask yet. Let do_signal() deliver - * the signal on the way back to userspace, before the signal - * mask is restored. - */ - if (sigmask) { - memcpy(¤t->saved_sigmask, &sigsaved, - sizeof(sigsaved)); - set_restore_sigmask(); - } - ret = -ERESTARTNOHAND; - } else if (sigmask) - sigprocmask(SIG_SETMASK, &sigsaved, NULL); - - ret = poll_select_copy_remaining(&end_time, tsp, 0, ret); - - return ret; -} - -#ifdef CONFIG_FHANDLE -/* - * Exactly like fs/open.c:sys_open_by_handle_at(), except that it - * doesn't set the O_LARGEFILE flag. - */ -COMPAT_SYSCALL_DEFINE3(open_by_handle_at, int, mountdirfd, - struct file_handle __user *, handle, int, flags) -{ - return do_handle_open(mountdirfd, handle, flags); -} -#endif diff --git a/fs/fcntl.c b/fs/fcntl.c index be8fbe289087..8bd81c2e89b2 100644 --- a/fs/fcntl.c +++ b/fs/fcntl.c @@ -23,6 +23,7 @@ #include <linux/pid_namespace.h> #include <linux/user_namespace.h> #include <linux/shmem_fs.h> +#include <linux/compat.h> #include <asm/poll.h> #include <asm/siginfo.h> @@ -420,6 +421,162 @@ out: } #endif +#ifdef CONFIG_COMPAT +static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl) +{ + if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) || + __get_user(kfl->l_type, &ufl->l_type) || + __get_user(kfl->l_whence, &ufl->l_whence) || + __get_user(kfl->l_start, &ufl->l_start) || + __get_user(kfl->l_len, &ufl->l_len) || + __get_user(kfl->l_pid, &ufl->l_pid)) + return -EFAULT; + return 0; +} + +static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl) +{ + if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) || + __put_user(kfl->l_type, &ufl->l_type) || + __put_user(kfl->l_whence, &ufl->l_whence) || + __put_user(kfl->l_start, &ufl->l_start) || + __put_user(kfl->l_len, &ufl->l_len) || + __put_user(kfl->l_pid, &ufl->l_pid)) + return -EFAULT; + return 0; +} + +#ifndef HAVE_ARCH_GET_COMPAT_FLOCK64 +static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl) +{ + if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) || + __get_user(kfl->l_type, &ufl->l_type) || + __get_user(kfl->l_whence, &ufl->l_whence) || + __get_user(kfl->l_start, &ufl->l_start) || + __get_user(kfl->l_len, &ufl->l_len) || + __get_user(kfl->l_pid, &ufl->l_pid)) + return -EFAULT; + return 0; +} +#endif + +#ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64 +static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl) +{ + if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) || + __put_user(kfl->l_type, &ufl->l_type) || + __put_user(kfl->l_whence, &ufl->l_whence) || + __put_user(kfl->l_start, &ufl->l_start) || + __put_user(kfl->l_len, &ufl->l_len) || + __put_user(kfl->l_pid, &ufl->l_pid)) + return -EFAULT; + return 0; +} +#endif + +static unsigned int +convert_fcntl_cmd(unsigned int cmd) +{ + switch (cmd) { + case F_GETLK64: + return F_GETLK; + case F_SETLK64: + return F_SETLK; + case F_SETLKW64: + return F_SETLKW; + } + + return cmd; +} + +COMPAT_SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd, + compat_ulong_t, arg) +{ + mm_segment_t old_fs; + struct flock f; + long ret; + unsigned int conv_cmd; + + switch (cmd) { + case F_GETLK: + case F_SETLK: + case F_SETLKW: + ret = get_compat_flock(&f, compat_ptr(arg)); + if (ret != 0) + break; + old_fs = get_fs(); + set_fs(KERNEL_DS); + ret = sys_fcntl(fd, cmd, (unsigned long)&f); + set_fs(old_fs); + if (cmd == F_GETLK && ret == 0) { + /* GETLK was successful and we need to return the data... + * but it needs to fit in the compat structure. + * l_start shouldn't be too big, unless the original + * start + end is greater than COMPAT_OFF_T_MAX, in which + * case the app was asking for trouble, so we return + * -EOVERFLOW in that case. + * l_len could be too big, in which case we just truncate it, + * and only allow the app to see that part of the conflicting + * lock that might make sense to it anyway + */ + + if (f.l_start > COMPAT_OFF_T_MAX) + ret = -EOVERFLOW; + if (f.l_len > COMPAT_OFF_T_MAX) + f.l_len = COMPAT_OFF_T_MAX; + if (ret == 0) + ret = put_compat_flock(&f, compat_ptr(arg)); + } + break; + + case F_GETLK64: + case F_SETLK64: + case F_SETLKW64: + case F_OFD_GETLK: + case F_OFD_SETLK: + case F_OFD_SETLKW: + ret = get_compat_flock64(&f, compat_ptr(arg)); + if (ret != 0) + break; + old_fs = get_fs(); + set_fs(KERNEL_DS); + conv_cmd = convert_fcntl_cmd(cmd); + ret = sys_fcntl(fd, conv_cmd, (unsigned long)&f); + set_fs(old_fs); + if ((conv_cmd == F_GETLK || conv_cmd == F_OFD_GETLK) && ret == 0) { + /* need to return lock information - see above for commentary */ + if (f.l_start > COMPAT_LOFF_T_MAX) + ret = -EOVERFLOW; + if (f.l_len > COMPAT_LOFF_T_MAX) + f.l_len = COMPAT_LOFF_T_MAX; + if (ret == 0) + ret = put_compat_flock64(&f, compat_ptr(arg)); + } + break; + + default: + ret = sys_fcntl(fd, cmd, arg); + break; + } + return ret; +} + +COMPAT_SYSCALL_DEFINE3(fcntl, unsigned int, fd, unsigned int, cmd, + compat_ulong_t, arg) +{ + switch (cmd) { + case F_GETLK64: + case F_SETLK64: + case F_SETLKW64: + case F_OFD_GETLK: + case F_OFD_SETLK: + case F_OFD_SETLKW: + return -EINVAL; + } + return compat_sys_fcntl64(fd, cmd, arg); +} +#endif + /* Table to convert sigio signal codes into poll band bitmaps */ static const long band_table[NSIGPOLL] = { diff --git a/fs/fhandle.c b/fs/fhandle.c index 5559168d5637..58a61f55e0d0 100644 --- a/fs/fhandle.c +++ b/fs/fhandle.c @@ -9,6 +9,7 @@ #include <linux/fsnotify.h> #include <linux/personality.h> #include <linux/uaccess.h> +#include <linux/compat.h> #include "internal.h" #include "mount.h" @@ -264,3 +265,15 @@ SYSCALL_DEFINE3(open_by_handle_at, int, mountdirfd, ret = do_handle_open(mountdirfd, handle, flags); return ret; } + +#ifdef CONFIG_COMPAT +/* + * Exactly like fs/open.c:sys_open_by_handle_at(), except that it + * doesn't set the O_LARGEFILE flag. + */ +COMPAT_SYSCALL_DEFINE3(open_by_handle_at, int, mountdirfd, + struct file_handle __user *, handle, int, flags) +{ + return do_handle_open(mountdirfd, handle, flags); +} +#endif diff --git a/fs/internal.h b/fs/internal.h index 11c6d89dce9c..076751d90ba2 100644 --- a/fs/internal.h +++ b/fs/internal.h @@ -108,8 +108,6 @@ extern struct file *do_filp_open(int dfd, struct filename *pathname, extern struct file *do_file_open_root(struct dentry *, struct vfsmount *, const char *, const struct open_flags *); -extern long do_handle_open(int mountdirfd, - struct file_handle __user *ufh, int open_flag); extern int open_check_o_direct(struct file *f); extern int vfs_open(const struct path *, struct file *, const struct cred *); extern struct file *filp_clone_open(struct file *); diff --git a/fs/open.c b/fs/open.c index 949cef29c3bb..4d23f729dcc6 100644 --- a/fs/open.c +++ b/fs/open.c @@ -1078,6 +1078,26 @@ SYSCALL_DEFINE4(openat, int, dfd, const char __user *, filename, int, flags, return do_sys_open(dfd, filename, flags, mode); } +#ifdef CONFIG_COMPAT +/* + * Exactly like sys_open(), except that it doesn't set the + * O_LARGEFILE flag. + */ +COMPAT_SYSCALL_DEFINE3(open, const char __user *, filename, int, flags, umode_t, mode) +{ + return do_sys_open(AT_FDCWD, filename, flags, mode); +} + +/* + * Exactly like sys_openat(), except that it doesn't set the + * O_LARGEFILE flag. + */ +COMPAT_SYSCALL_DEFINE4(openat, int, dfd, const char __user *, filename, int, flags, umode_t, mode) +{ + return do_sys_open(dfd, filename, flags, mode); +} +#endif + #ifndef __alpha__ /* diff --git a/fs/read_write.c b/fs/read_write.c index c4f88afbc67f..47c1d4484df9 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -841,6 +841,81 @@ out: return ret; } +#ifdef CONFIG_COMPAT +ssize_t compat_rw_copy_check_uvector(int type, + const struct compat_iovec __user *uvector, unsigned long nr_segs, + unsigned long fast_segs, struct iovec *fast_pointer, + struct iovec **ret_pointer) +{ + compat_ssize_t tot_len; + struct iovec *iov = *ret_pointer = fast_pointer; + ssize_t ret = 0; + int seg; + + /* + * SuS says "The readv() function *may* fail if the iovcnt argument + * was less than or equal to 0, or greater than {IOV_MAX}. Linux has + * traditionally returned zero for zero segments, so... + */ + if (nr_segs == 0) + goto out; + + ret = -EINVAL; + if (nr_segs > UIO_MAXIOV) + goto out; + if (nr_segs > fast_segs) { + ret = -ENOMEM; + iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL); + if (iov == NULL) + goto out; + } + *ret_pointer = iov; + + ret = -EFAULT; + if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector))) + goto out; + + /* + * Single unix specification: + * We should -EINVAL if an element length is not >= 0 and fitting an + * ssize_t. + * + * In Linux, the total length is limited to MAX_RW_COUNT, there is + * no overflow possibility. + */ + tot_len = 0; + ret = -EINVAL; + for (seg = 0; seg < nr_segs; seg++) { + compat_uptr_t buf; + compat_ssize_t len; + + if (__get_user(len, &uvector->iov_len) || + __get_user(buf, &uvector->iov_base)) { + ret = -EFAULT; + goto out; + } + if (len < 0) /* size_t not fitting in compat_ssize_t .. */ + goto out; + if (type >= 0 && + !access_ok(vrfy_dir(type), compat_ptr(buf), len)) { + ret = -EFAULT; + goto out; + } + if (len > MAX_RW_COUNT - tot_len) + len = MAX_RW_COUNT - tot_len; + tot_len += len; + iov->iov_base = compat_ptr(buf); + iov->iov_len = (compat_size_t) len; + uvector++; + iov++; + } + ret = tot_len; + +out: + return ret; +} +#endif + static ssize_t __do_readv_writev(int type, struct file *file, struct iov_iter *iter, loff_t *pos, int flags) { diff --git a/fs/readdir.c b/fs/readdir.c index 0e8a7f355f7a..89659549c09d 100644 --- a/fs/readdir.c +++ b/fs/readdir.c @@ -18,6 +18,7 @@ #include <linux/security.h> #include <linux/syscalls.h> #include <linux/unistd.h> +#include <linux/compat.h> #include <linux/uaccess.h> @@ -324,3 +325,167 @@ SYSCALL_DEFINE3(getdents64, unsigned int, fd, fdput_pos(f); return error; } + +#ifdef CONFIG_COMPAT +struct compat_old_linux_dirent { + compat_ulong_t d_ino; + compat_ulong_t d_offset; + unsigned short d_namlen; + char d_name[1]; +}; + +struct compat_readdir_callback { + struct dir_context ctx; + struct compat_old_linux_dirent __user *dirent; + int result; +}; + +static int compat_fillonedir(struct dir_context *ctx, const char *name, + int namlen, loff_t offset, u64 ino, + unsigned int d_type) +{ + struct compat_readdir_callback *buf = + container_of(ctx, struct compat_readdir_callback, ctx); + struct compat_old_linux_dirent __user *dirent; + compat_ulong_t d_ino; + + if (buf->result) + return -EINVAL; + d_ino = ino; + if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) { + buf->result = -EOVERFLOW; + return -EOVERFLOW; + } + buf->result++; + dirent = buf->dirent; + if (!access_ok(VERIFY_WRITE, dirent, + (unsigned long)(dirent->d_name + namlen + 1) - + (unsigned long)dirent)) + goto efault; + if ( __put_user(d_ino, &dirent->d_ino) || + __put_user(offset, &dirent->d_offset) || + __put_user(namlen, &dirent->d_namlen) || + __copy_to_user(dirent->d_name, name, namlen) || + __put_user(0, dirent->d_name + namlen)) + goto efault; + return 0; +efault: + buf->result = -EFAULT; + return -EFAULT; +} + +COMPAT_SYSCALL_DEFINE3(old_readdir, unsigned int, fd, + struct compat_old_linux_dirent __user *, dirent, unsigned int, count) +{ + int error; + struct fd f = fdget_pos(fd); + struct compat_readdir_callback buf = { + .ctx.actor = compat_fillonedir, + .dirent = dirent + }; + + if (!f.file) + return -EBADF; + + error = iterate_dir(f.file, &buf.ctx); + if (buf.result) + error = buf.result; + + fdput_pos(f); + return error; +} + +struct compat_linux_dirent { + compat_ulong_t d_ino; + compat_ulong_t d_off; + unsigned short d_reclen; + char d_name[1]; +}; + +struct compat_getdents_callback { + struct dir_context ctx; + struct compat_linux_dirent __user *current_dir; + struct compat_linux_dirent __user *previous; + int count; + int error; +}; + +static int compat_filldir(struct dir_context *ctx, const char *name, int namlen, + loff_t offset, u64 ino, unsigned int d_type) +{ + struct compat_linux_dirent __user * dirent; + struct compat_getdents_callback *buf = + container_of(ctx, struct compat_getdents_callback, ctx); + compat_ulong_t d_ino; + int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) + + namlen + 2, sizeof(compat_long_t)); + + buf->error = -EINVAL; /* only used if we fail.. */ + if (reclen > buf->count) + return -EINVAL; + d_ino = ino; + if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) { + buf->error = -EOVERFLOW; + return -EOVERFLOW; + } + dirent = buf->previous; + if (dirent) { + if (signal_pending(current)) + return -EINTR; + if (__put_user(offset, &dirent->d_off)) + goto efault; + } + dirent = buf->current_dir; + if (__put_user(d_ino, &dirent->d_ino)) + goto efault; + if (__put_user(reclen, &dirent->d_reclen)) + goto efault; + if (copy_to_user(dirent->d_name, name, namlen)) + goto efault; + if (__put_user(0, dirent->d_name + namlen)) + goto efault; + if (__put_user(d_type, (char __user *) dirent + reclen - 1)) + goto efault; + buf->previous = dirent; + dirent = (void __user *)dirent + reclen; + buf->current_dir = dirent; + buf->count -= reclen; + return 0; +efault: + buf->error = -EFAULT; + return -EFAULT; +} + +COMPAT_SYSCALL_DEFINE3(getdents, unsigned int, fd, + struct compat_linux_dirent __user *, dirent, unsigned int, count) +{ + struct fd f; + struct compat_linux_dirent __user * lastdirent; + struct compat_getdents_callback buf = { + .ctx.actor = compat_filldir, + .current_dir = dirent, + .count = count + }; + int error; + + if (!access_ok(VERIFY_WRITE, dirent, count)) + return -EFAULT; + + f = fdget_pos(fd); + if (!f.file) + return -EBADF; + + error = iterate_dir(f.file, &buf.ctx); + if (error >= 0) + error = buf.error; + lastdirent = buf.previous; + if (lastdirent) { + if (put_user(buf.ctx.pos, &lastdirent->d_off)) + error = -EFAULT; + else + error = count - buf.count; + } + fdput_pos(f); + return error; +} +#endif diff --git a/fs/select.c b/fs/select.c index e2112270d75a..dd70937ddb60 100644 --- a/fs/select.c +++ b/fs/select.c @@ -338,6 +338,53 @@ sticky: return ret; } +/* + * Scalable version of the fd_set. + */ + +typedef struct { + unsigned long *in, *out, *ex; + unsigned long *res_in, *res_out, *res_ex; +} fd_set_bits; + +/* + * How many longwords for "nr" bits? + */ +#define FDS_BITPERLONG (8*sizeof(long)) +#define FDS_LONGS(nr) (((nr)+FDS_BITPERLONG-1)/FDS_BITPERLONG) +#define FDS_BYTES(nr) (FDS_LONGS(nr)*sizeof(long)) + +/* + * We do a VERIFY_WRITE here even though we are only reading this time: + * we'll write to it eventually.. + * + * Use "unsigned long" accesses to let user-mode fd_set's be long-aligned. + */ +static inline +int get_fd_set(unsigned long nr, void __user *ufdset, unsigned long *fdset) +{ + nr = FDS_BYTES(nr); + if (ufdset) + return copy_from_user(fdset, ufdset, nr) ? -EFAULT : 0; + + memset(fdset, 0, nr); + return 0; +} + +static inline unsigned long __must_check +set_fd_set(unsigned long nr, void __user *ufdset, unsigned long *fdset) +{ + if (ufdset) + return __copy_to_user(ufdset, fdset, FDS_BYTES(nr)); + return 0; +} + +static inline +void zero_fd_set(unsigned long nr, unsigned long *fdset) +{ + memset(fdset, 0, FDS_BYTES(nr)); +} + #define FDS_IN(fds, n) (fds->in + n) #define FDS_OUT(fds, n) (fds->out + n) #define FDS_EX(fds, n) (fds->ex + n) @@ -401,7 +448,7 @@ static inline void wait_key_set(poll_table *wait, unsigned long in, wait->_key |= POLLOUT_SET; } -int do_select(int n, fd_set_bits *fds, struct timespec64 *end_time) +static int do_select(int n, fd_set_bits *fds, struct timespec64 *end_time) { ktime_t expire, *to = NULL; struct poll_wqueues table; @@ -881,7 +928,7 @@ static int do_poll(struct poll_list *list, struct poll_wqueues *wait, #define N_STACK_PPS ((sizeof(stack_pps) - sizeof(struct poll_list)) / \ sizeof(struct pollfd)) -int do_sys_poll(struct pollfd __user *ufds, unsigned int nfds, +static int do_sys_poll(struct pollfd __user *ufds, unsigned int nfds, struct timespec64 *end_time) { struct poll_wqueues table; @@ -1053,3 +1100,373 @@ SYSCALL_DEFINE5(ppoll, struct pollfd __user *, ufds, unsigned int, nfds, return ret; } + +#ifdef CONFIG_COMPAT +#define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t)) + +static +int compat_poll_select_copy_remaining(struct timespec *end_time, void __user *p, + int timeval, int ret) +{ + struct timespec ts; + + if (!p) + return ret; + + if (current->personality & STICKY_TIMEOUTS) + goto sticky; + + /* No update for zero timeout */ + if (!end_time->tv_sec && !end_time->tv_nsec) + return ret; + + ktime_get_ts(&ts); + ts = timespec_sub(*end_time, ts); + if (ts.tv_sec < 0) + ts.tv_sec = ts.tv_nsec = 0; + + if (timeval) { + struct compat_timeval rtv; + + rtv.tv_sec = ts.tv_sec; + rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC; + + if (!copy_to_user(p, &rtv, sizeof(rtv))) + return ret; + } else { + struct compat_timespec rts; + + rts.tv_sec = ts.tv_sec; + rts.tv_nsec = ts.tv_nsec; + + if (!copy_to_user(p, &rts, sizeof(rts))) + return ret; + } + /* + * If an application puts its timeval in read-only memory, we + * don't want the Linux-specific update to the timeval to + * cause a fault after the select has completed + * successfully. However, because we're not updating the + * timeval, we can't restart the system call. + */ + +sticky: + if (ret == -ERESTARTNOHAND) + ret = -EINTR; + return ret; +} + +/* + * Ooo, nasty. We need here to frob 32-bit unsigned longs to + * 64-bit unsigned longs. + */ +static +int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset, + unsigned long *fdset) +{ + nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS); + if (ufdset) { + unsigned long odd; + + if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t))) + return -EFAULT; + + odd = nr & 1UL; + nr &= ~1UL; + while (nr) { + unsigned long h, l; + if (__get_user(l, ufdset) || __get_user(h, ufdset+1)) + return -EFAULT; + ufdset += 2; + *fdset++ = h << 32 | l; + nr -= 2; + } + if (odd && __get_user(*fdset, ufdset)) + return -EFAULT; + } else { + /* Tricky, must clear full unsigned long in the + * kernel fdset at the end, this makes sure that + * actually happens. + */ + memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t)); + } + return 0; +} + +static +int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset, + unsigned long *fdset) +{ + unsigned long odd; + nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS); + + if (!ufdset) + return 0; + + odd = nr & 1UL; + nr &= ~1UL; + while (nr) { + unsigned long h, l; + l = *fdset++; + h = l >> 32; + if (__put_user(l, ufdset) || __put_user(h, ufdset+1)) + return -EFAULT; + ufdset += 2; + nr -= 2; + } + if (odd && __put_user(*fdset, ufdset)) + return -EFAULT; + return 0; +} + + +/* + * This is a virtual copy of sys_select from fs/select.c and probably + * should be compared to it from time to time + */ + +/* + * We can actually return ERESTARTSYS instead of EINTR, but I'd + * like to be certain this leads to no problems. So I return + * EINTR just for safety. + * + * Update: ERESTARTSYS breaks at least the xview clock binary, so + * I'm trying ERESTARTNOHAND which restart only when you want to. + */ +static int compat_core_sys_select(int n, compat_ulong_t __user *inp, + compat_ulong_t __user *outp, compat_ulong_t __user *exp, + struct timespec *end_time) +{ + fd_set_bits fds; + void *bits; + int size, max_fds, ret = -EINVAL; + struct fdtable *fdt; + long stack_fds[SELECT_STACK_ALLOC/sizeof(long)]; + + if (n < 0) + goto out_nofds; + + /* max_fds can increase, so grab it once to avoid race */ + rcu_read_lock(); + fdt = files_fdtable(current->files); + max_fds = fdt->max_fds; + rcu_read_unlock(); + if (n > max_fds) + n = max_fds; + + /* + * We need 6 bitmaps (in/out/ex for both incoming and outgoing), + * since we used fdset we need to allocate memory in units of + * long-words. + */ + size = FDS_BYTES(n); + bits = stack_fds; + if (size > sizeof(stack_fds) / 6) { + bits = kmalloc(6 * size, GFP_KERNEL); + ret = -ENOMEM; + if (!bits) + goto out_nofds; + } + fds.in = (unsigned long *) bits; + fds.out = (unsigned long *) (bits + size); + fds.ex = (unsigned long *) (bits + 2*size); + fds.res_in = (unsigned long *) (bits + 3*size); + fds.res_out = (unsigned long *) (bits + 4*size); + fds.res_ex = (unsigned long *) (bits + 5*size); + + if ((ret = compat_get_fd_set(n, inp, fds.in)) || + (ret = compat_get_fd_set(n, outp, fds.out)) || + (ret = compat_get_fd_set(n, exp, fds.ex))) + goto out; + zero_fd_set(n, fds.res_in); + zero_fd_set(n, fds.res_out); + zero_fd_set(n, fds.res_ex); + + ret = do_select(n, &fds, end_time); + + if (ret < 0) + goto out; + if (!ret) { + ret = -ERESTARTNOHAND; + if (signal_pending(current)) + goto out; + ret = 0; + } + + if (compat_set_fd_set(n, inp, fds.res_in) || + compat_set_fd_set(n, outp, fds.res_out) || + compat_set_fd_set(n, exp, fds.res_ex)) + ret = -EFAULT; +out: + if (bits != stack_fds) + kfree(bits); +out_nofds: + return ret; +} + +COMPAT_SYSCALL_DEFINE5(select, int, n, compat_ulong_t __user *, inp, + compat_ulong_t __user *, outp, compat_ulong_t __user *, exp, + struct compat_timeval __user *, tvp) +{ + struct timespec end_time, *to = NULL; + struct compat_timeval tv; + int ret; + + if (tvp) { + if (copy_from_user(&tv, tvp, sizeof(tv))) + return -EFAULT; + + to = &end_time; + if (poll_select_set_timeout(to, + tv.tv_sec + (tv.tv_usec / USEC_PER_SEC), + (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC)) + return -EINVAL; + } + + ret = compat_core_sys_select(n, inp, outp, exp, to); + ret = compat_poll_select_copy_remaining(&end_time, tvp, 1, ret); + + return ret; +} + +struct compat_sel_arg_struct { + compat_ulong_t n; + compat_uptr_t inp; + compat_uptr_t outp; + compat_uptr_t exp; + compat_uptr_t tvp; +}; + +COMPAT_SYSCALL_DEFINE1(old_select, struct compat_sel_arg_struct __user *, arg) +{ + struct compat_sel_arg_struct a; + + if (copy_from_user(&a, arg, sizeof(a))) + return -EFAULT; + return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp), + compat_ptr(a.exp), compat_ptr(a.tvp)); +} + +static long do_compat_pselect(int n, compat_ulong_t __user *inp, + compat_ulong_t __user *outp, compat_ulong_t __user *exp, + struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask, + compat_size_t sigsetsize) +{ + compat_sigset_t ss32; + sigset_t ksigmask, sigsaved; + struct compat_timespec ts; + struct timespec end_time, *to = NULL; + int ret; + + if (tsp) { + if (copy_from_user(&ts, tsp, sizeof(ts))) + return -EFAULT; + + to = &end_time; + if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec)) + return -EINVAL; + } + + if (sigmask) { + if (sigsetsize != sizeof(compat_sigset_t)) + return -EINVAL; + if (copy_from_user(&ss32, sigmask, sizeof(ss32))) + return -EFAULT; + sigset_from_compat(&ksigmask, &ss32); + + sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP)); + sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved); + } + + ret = compat_core_sys_select(n, inp, outp, exp, to); + ret = compat_poll_select_copy_remaining(&end_time, tsp, 0, ret); + + if (ret == -ERESTARTNOHAND) { + /* + * Don't restore the signal mask yet. Let do_signal() deliver + * the signal on the way back to userspace, before the signal + * mask is restored. + */ + if (sigmask) { + memcpy(¤t->saved_sigmask, &sigsaved, + sizeof(sigsaved)); + set_restore_sigmask(); + } + } else if (sigmask) + sigprocmask(SIG_SETMASK, &sigsaved, NULL); + + return ret; +} + +COMPAT_SYSCALL_DEFINE6(pselect6, int, n, compat_ulong_t __user *, inp, + compat_ulong_t __user *, outp, compat_ulong_t __user *, exp, + struct compat_timespec __user *, tsp, void __user *, sig) +{ + compat_size_t sigsetsize = 0; + compat_uptr_t up = 0; + + if (sig) { + if (!access_ok(VERIFY_READ, sig, + sizeof(compat_uptr_t)+sizeof(compat_size_t)) || + __get_user(up, (compat_uptr_t __user *)sig) || + __get_user(sigsetsize, + (compat_size_t __user *)(sig+sizeof(up)))) + return -EFAULT; + } + return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up), + sigsetsize); +} + +COMPAT_SYSCALL_DEFINE5(ppoll, struct pollfd __user *, ufds, + unsigned int, nfds, struct compat_timespec __user *, tsp, + const compat_sigset_t __user *, sigmask, compat_size_t, sigsetsize) +{ + compat_sigset_t ss32; + sigset_t ksigmask, sigsaved; + struct compat_timespec ts; + struct timespec end_time, *to = NULL; + int ret; + + if (tsp) { + if (copy_from_user(&ts, tsp, sizeof(ts))) + return -EFAULT; + + to = &end_time; + if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec)) + return -EINVAL; + } + + if (sigmask) { + if (sigsetsize != sizeof(compat_sigset_t)) + return -EINVAL; + if (copy_from_user(&ss32, sigmask, sizeof(ss32))) + return -EFAULT; + sigset_from_compat(&ksigmask, &ss32); + + sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP)); + sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved); + } + + ret = do_sys_poll(ufds, nfds, to); + + /* We can restart this syscall, usually */ + if (ret == -EINTR) { + /* + * Don't restore the signal mask yet. Let do_signal() deliver + * the signal on the way back to userspace, before the signal + * mask is restored. + */ + if (sigmask) { + memcpy(¤t->saved_sigmask, &sigsaved, + sizeof(sigsaved)); + set_restore_sigmask(); + } + ret = -ERESTARTNOHAND; + } else if (sigmask) + sigprocmask(SIG_SETMASK, &sigsaved, NULL); + + ret = compat_poll_select_copy_remaining(&end_time, tsp, 0, ret); + + return ret; +} +#endif diff --git a/fs/stat.c b/fs/stat.c index a257b872a53d..f494b182c7c7 100644 --- a/fs/stat.c +++ b/fs/stat.c @@ -15,6 +15,7 @@ #include <linux/cred.h> #include <linux/syscalls.h> #include <linux/pagemap.h> +#include <linux/compat.h> #include <linux/uaccess.h> #include <asm/unistd.h> @@ -575,6 +576,91 @@ SYSCALL_DEFINE5(statx, return cp_statx(&stat, buffer); } +#ifdef CONFIG_COMPAT +static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf) +{ + struct compat_stat tmp; + + if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev)) + return -EOVERFLOW; + + memset(&tmp, 0, sizeof(tmp)); + tmp.st_dev = old_encode_dev(stat->dev); + tmp.st_ino = stat->ino; + if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) + return -EOVERFLOW; + tmp.st_mode = stat->mode; + tmp.st_nlink = stat->nlink; + if (tmp.st_nlink != stat->nlink) + return -EOVERFLOW; + SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid)); + SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid)); + tmp.st_rdev = old_encode_dev(stat->rdev); + if ((u64) stat->size > MAX_NON_LFS) + return -EOVERFLOW; + tmp.st_size = stat->size; + tmp.st_atime = stat->atime.tv_sec; + tmp.st_atime_nsec = stat->atime.tv_nsec; + tmp.st_mtime = stat->mtime.tv_sec; + tmp.st_mtime_nsec = stat->mtime.tv_nsec; + tmp.st_ctime = stat->ctime.tv_sec; + tmp.st_ctime_nsec = stat->ctime.tv_nsec; + tmp.st_blocks = stat->blocks; + tmp.st_blksize = stat->blksize; + return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0; +} + +COMPAT_SYSCALL_DEFINE2(newstat, const char __user *, filename, + struct compat_stat __user *, statbuf) +{ + struct kstat stat; + int error; + + error = vfs_stat(filename, &stat); + if (error) + return error; + return cp_compat_stat(&stat, statbuf); +} + +COMPAT_SYSCALL_DEFINE2(newlstat, const char __user *, filename, + struct compat_stat __user *, statbuf) +{ + struct kstat stat; + int error; + + error = vfs_lstat(filename, &stat); + if (error) + return error; + return cp_compat_stat(&stat, statbuf); +} + +#ifndef __ARCH_WANT_STAT64 +COMPAT_SYSCALL_DEFINE4(newfstatat, unsigned int, dfd, + const char __user *, filename, + struct compat_stat __user *, statbuf, int, flag) +{ + struct kstat stat; + int error; + + error = vfs_fstatat(dfd, filename, &stat, flag); + if (error) + return error; + return cp_compat_stat(&stat, statbuf); +} +#endif + +COMPAT_SYSCALL_DEFINE2(newfstat, unsigned int, fd, + struct compat_stat __user *, statbuf) +{ + struct kstat stat; + int error = vfs_fstat(fd, &stat); + + if (!error) + error = cp_compat_stat(&stat, statbuf); + return error; +} +#endif + /* Caller is here responsible for sufficient locking (ie. inode->i_lock) */ void __inode_add_bytes(struct inode *inode, loff_t bytes) { diff --git a/fs/statfs.c b/fs/statfs.c index 13ae259d4879..4e4623c7a126 100644 --- a/fs/statfs.c +++ b/fs/statfs.c @@ -7,6 +7,7 @@ #include <linux/statfs.h> #include <linux/security.h> #include <linux/uaccess.h> +#include <linux/compat.h> #include "internal.h" static int flags_by_mnt(int mnt_flags) @@ -239,3 +240,142 @@ SYSCALL_DEFINE2(ustat, unsigned, dev, struct ustat __user *, ubuf) return copy_to_user(ubuf, &tmp, sizeof(struct ustat)) ? -EFAULT : 0; } + +#ifdef CONFIG_COMPAT +static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf) +{ + if (sizeof ubuf->f_blocks == 4) { + if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail | + kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL) + return -EOVERFLOW; + /* f_files and f_ffree may be -1; it's okay + * to stuff that into 32 bits */ + if (kbuf->f_files != 0xffffffffffffffffULL + && (kbuf->f_files & 0xffffffff00000000ULL)) + return -EOVERFLOW; + if (kbuf->f_ffree != 0xffffffffffffffffULL + && (kbuf->f_ffree & 0xffffffff00000000ULL)) + return -EOVERFLOW; + } + if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) || + __put_user(kbuf->f_type, &ubuf->f_type) || + __put_user(kbuf->f_bsize, &ubuf->f_bsize) || + __put_user(kbuf->f_blocks, &ubuf->f_blocks) || + __put_user(kbuf->f_bfree, &ubuf->f_bfree) || + __put_user(kbuf->f_bavail, &ubuf->f_bavail) || + __put_user(kbuf->f_files, &ubuf->f_files) || + __put_user(kbuf->f_ffree, &ubuf->f_ffree) || + __put_user(kbuf->f_namelen, &ubuf->f_namelen) || + __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) || + __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) || + __put_user(kbuf->f_frsize, &ubuf->f_frsize) || + __put_user(kbuf->f_flags, &ubuf->f_flags) || + __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare))) + return -EFAULT; + return 0; +} + +/* + * The following statfs calls are copies of code from fs/statfs.c and + * should be checked against those from time to time + */ +COMPAT_SYSCALL_DEFINE2(statfs, const char __user *, pathname, struct compat_statfs __user *, buf) +{ + struct kstatfs tmp; + int error = user_statfs(pathname, &tmp); + if (!error) + error = put_compat_statfs(buf, &tmp); + return error; +} + +COMPAT_SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct compat_statfs __user *, buf) +{ + struct kstatfs tmp; + int error = fd_statfs(fd, &tmp); + if (!error) + error = put_compat_statfs(buf, &tmp); + return error; +} + +static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf) +{ + if (sizeof(ubuf->f_bsize) == 4) { + if ((kbuf->f_type | kbuf->f_bsize | kbuf->f_namelen | + kbuf->f_frsize | kbuf->f_flags) & 0xffffffff00000000ULL) + return -EOVERFLOW; + /* f_files and f_ffree may be -1; it's okay + * to stuff that into 32 bits */ + if (kbuf->f_files != 0xffffffffffffffffULL + && (kbuf->f_files & 0xffffffff00000000ULL)) + return -EOVERFLOW; + if (kbuf->f_ffree != 0xffffffffffffffffULL + && (kbuf->f_ffree & 0xffffffff00000000ULL)) + return -EOVERFLOW; + } + if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) || + __put_user(kbuf->f_type, &ubuf->f_type) || + __put_user(kbuf->f_bsize, &ubuf->f_bsize) || + __put_user(kbuf->f_blocks, &ubuf->f_blocks) || + __put_user(kbuf->f_bfree, &ubuf->f_bfree) || + __put_user(kbuf->f_bavail, &ubuf->f_bavail) || + __put_user(kbuf->f_files, &ubuf->f_files) || + __put_user(kbuf->f_ffree, &ubuf->f_ffree) || + __put_user(kbuf->f_namelen, &ubuf->f_namelen) || + __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) || + __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) || + __put_user(kbuf->f_frsize, &ubuf->f_frsize) || + __put_user(kbuf->f_flags, &ubuf->f_flags) || + __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare))) + return -EFAULT; + return 0; +} + +COMPAT_SYSCALL_DEFINE3(statfs64, const char __user *, pathname, compat_size_t, sz, struct compat_statfs64 __user *, buf) +{ + struct kstatfs tmp; + int error; + + if (sz != sizeof(*buf)) + return -EINVAL; + + error = user_statfs(pathname, &tmp); + if (!error) + error = put_compat_statfs64(buf, &tmp); + return error; +} + +COMPAT_SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, compat_size_t, sz, struct compat_statfs64 __user *, buf) +{ + struct kstatfs tmp; + int error; + + if (sz != sizeof(*buf)) + return -EINVAL; + + error = fd_statfs(fd, &tmp); + if (!error) + error = put_compat_statfs64(buf, &tmp); + return error; +} + +/* + * This is a copy of sys_ustat, just dealing with a structure layout. + * Given how simple this syscall is that apporach is more maintainable + * than the various conversion hacks. + */ +COMPAT_SYSCALL_DEFINE2(ustat, unsigned, dev, struct compat_ustat __user *, u) +{ + struct compat_ustat tmp; + struct kstatfs sbuf; + int err = vfs_ustat(new_decode_dev(dev), &sbuf); + if (err) + return err; + + memset(&tmp, 0, sizeof(struct compat_ustat)); + tmp.f_tfree = sbuf.f_bfree; + tmp.f_tinode = sbuf.f_ffree; + if (copy_to_user(u, &tmp, sizeof(struct compat_ustat))) + return -EFAULT; + return 0; +} +#endif diff --git a/fs/utimes.c b/fs/utimes.c index 32b15b3f6629..6571d8c848a0 100644 --- a/fs/utimes.c +++ b/fs/utimes.c @@ -1,14 +1,10 @@ -#include <linux/compiler.h> #include <linux/file.h> -#include <linux/fs.h> -#include <linux/linkage.h> #include <linux/mount.h> #include <linux/namei.h> -#include <linux/sched.h> -#include <linux/stat.h> #include <linux/utime.h> #include <linux/syscalls.h> #include <linux/uaccess.h> +#include <linux/compat.h> #include <asm/unistd.h> #ifdef __ARCH_WANT_SYS_UTIME @@ -219,3 +215,63 @@ SYSCALL_DEFINE2(utimes, char __user *, filename, { return sys_futimesat(AT_FDCWD, filename, utimes); } + +#ifdef CONFIG_COMPAT +/* + * Not all architectures have sys_utime, so implement this in terms + * of sys_utimes. + */ +COMPAT_SYSCALL_DEFINE2(utime, const char __user *, filename, + struct compat_utimbuf __user *, t) +{ + struct timespec tv[2]; + + if (t) { + if (get_user(tv[0].tv_sec, &t->actime) || + get_user(tv[1].tv_sec, &t->modtime)) + return -EFAULT; + tv[0].tv_nsec = 0; + tv[1].tv_nsec = 0; + } + return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0); +} + +COMPAT_SYSCALL_DEFINE4(utimensat, unsigned int, dfd, const char __user *, filename, struct compat_timespec __user *, t, int, flags) +{ + struct timespec tv[2]; + + if (t) { + if (compat_get_timespec(&tv[0], &t[0]) || + compat_get_timespec(&tv[1], &t[1])) + return -EFAULT; + + if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT) + return 0; + } + return do_utimes(dfd, filename, t ? tv : NULL, flags); +} + +COMPAT_SYSCALL_DEFINE3(futimesat, unsigned int, dfd, const char __user *, filename, struct compat_timeval __user *, t) +{ + struct timespec tv[2]; + + if (t) { + if (get_user(tv[0].tv_sec, &t[0].tv_sec) || + get_user(tv[0].tv_nsec, &t[0].tv_usec) || + get_user(tv[1].tv_sec, &t[1].tv_sec) || + get_user(tv[1].tv_nsec, &t[1].tv_usec)) + return -EFAULT; + if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 || + tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0) + return -EINVAL; + tv[0].tv_nsec *= 1000; + tv[1].tv_nsec *= 1000; + } + return do_utimes(dfd, filename, t ? tv : NULL, 0); +} + +COMPAT_SYSCALL_DEFINE2(utimes, const char __user *, filename, struct compat_timeval __user *, t) +{ + return compat_sys_futimesat(AT_FDCWD, filename, t); +} +#endif diff --git a/include/linux/compat.h b/include/linux/compat.h index af9dbc44fd92..8172b03685f9 100644 --- a/include/linux/compat.h +++ b/include/linux/compat.h @@ -528,11 +528,6 @@ asmlinkage long compat_sys_old_readdir(unsigned int fd, asmlinkage long compat_sys_getdents(unsigned int fd, struct compat_linux_dirent __user *dirent, unsigned int count); -#ifdef __ARCH_WANT_COMPAT_SYS_GETDENTS64 -asmlinkage long compat_sys_getdents64(unsigned int fd, - struct linux_dirent64 __user *dirent, - unsigned int count); -#endif asmlinkage long compat_sys_vmsplice(int fd, const struct compat_iovec __user *, unsigned int nr_segs, unsigned int flags); asmlinkage long compat_sys_open(const char __user *filename, int flags, diff --git a/include/linux/poll.h b/include/linux/poll.h index a46d6755035e..75ffc5729e4c 100644 --- a/include/linux/poll.h +++ b/include/linux/poll.h @@ -98,64 +98,8 @@ extern int poll_schedule_timeout(struct poll_wqueues *pwq, int state, ktime_t *expires, unsigned long slack); extern u64 select_estimate_accuracy(struct timespec64 *tv); - -static inline int poll_schedule(struct poll_wqueues *pwq, int state) -{ - return poll_schedule_timeout(pwq, state, NULL, 0); -} - -/* - * Scalable version of the fd_set. - */ - -typedef struct { - unsigned long *in, *out, *ex; - unsigned long *res_in, *res_out, *res_ex; -} fd_set_bits; - -/* - * How many longwords for "nr" bits? - */ -#define FDS_BITPERLONG (8*sizeof(long)) -#define FDS_LONGS(nr) (((nr)+FDS_BITPERLONG-1)/FDS_BITPERLONG) -#define FDS_BYTES(nr) (FDS_LONGS(nr)*sizeof(long)) - -/* - * We do a VERIFY_WRITE here even though we are only reading this time: - * we'll write to it eventually.. - * - * Use "unsigned long" accesses to let user-mode fd_set's be long-aligned. - */ -static inline -int get_fd_set(unsigned long nr, void __user *ufdset, unsigned long *fdset) -{ - nr = FDS_BYTES(nr); - if (ufdset) - return copy_from_user(fdset, ufdset, nr) ? -EFAULT : 0; - - memset(fdset, 0, nr); - return 0; -} - -static inline unsigned long __must_check -set_fd_set(unsigned long nr, void __user *ufdset, unsigned long *fdset) -{ - if (ufdset) - return __copy_to_user(ufdset, fdset, FDS_BYTES(nr)); - return 0; -} - -static inline -void zero_fd_set(unsigned long nr, unsigned long *fdset) -{ - memset(fdset, 0, FDS_BYTES(nr)); -} - #define MAX_INT64_SECONDS (((s64)(~((u64)0)>>1)/HZ)-1) -extern int do_select(int n, fd_set_bits *fds, struct timespec64 *end_time); -extern int do_sys_poll(struct pollfd __user * ufds, unsigned int nfds, - struct timespec64 *end_time); extern int core_sys_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timespec64 *end_time); diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h index a076cf1a3a23..061185a5eb51 100644 --- a/include/uapi/asm-generic/unistd.h +++ b/include/uapi/asm-generic/unistd.h @@ -194,8 +194,7 @@ __SYSCALL(__NR_quotactl, sys_quotactl) /* fs/readdir.c */ #define __NR_getdents64 61 -#define __ARCH_WANT_COMPAT_SYS_GETDENTS64 -__SC_COMP(__NR_getdents64, sys_getdents64, compat_sys_getdents64) +__SYSCALL(__NR_getdents64, sys_getdents64) /* fs/read_write.c */ #define __NR3264_lseek 62 |