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Diffstat (limited to 'fs/proc')
-rw-r--r--fs/proc/base.c63
-rw-r--r--fs/proc/stat.c34
-rw-r--r--fs/proc/task_mmu.c15
3 files changed, 60 insertions, 52 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 1c8b280146d7..57b8159f26f3 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1799,10 +1799,15 @@ static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
if (task) {
files = get_files_struct(task);
if (files) {
+ struct file *file;
rcu_read_lock();
- if (fcheck_files(files, fd)) {
+ file = fcheck_files(files, fd);
+ if (file) {
+ unsigned i_mode, f_mode = file->f_mode;
+
rcu_read_unlock();
put_files_struct(files);
+
if (task_dumpable(task)) {
rcu_read_lock();
cred = __task_cred(task);
@@ -1813,7 +1818,14 @@ static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
inode->i_uid = 0;
inode->i_gid = 0;
}
- inode->i_mode &= ~(S_ISUID | S_ISGID);
+
+ i_mode = S_IFLNK;
+ if (f_mode & FMODE_READ)
+ i_mode |= S_IRUSR | S_IXUSR;
+ if (f_mode & FMODE_WRITE)
+ i_mode |= S_IWUSR | S_IXUSR;
+ inode->i_mode = i_mode;
+
security_task_to_inode(task, inode);
put_task_struct(task);
return 1;
@@ -1837,8 +1849,6 @@ static struct dentry *proc_fd_instantiate(struct inode *dir,
struct dentry *dentry, struct task_struct *task, const void *ptr)
{
unsigned fd = *(const unsigned *)ptr;
- struct file *file;
- struct files_struct *files;
struct inode *inode;
struct proc_inode *ei;
struct dentry *error = ERR_PTR(-ENOENT);
@@ -1848,25 +1858,6 @@ static struct dentry *proc_fd_instantiate(struct inode *dir,
goto out;
ei = PROC_I(inode);
ei->fd = fd;
- files = get_files_struct(task);
- if (!files)
- goto out_iput;
- inode->i_mode = S_IFLNK;
-
- /*
- * We are not taking a ref to the file structure, so we must
- * hold ->file_lock.
- */
- spin_lock(&files->file_lock);
- file = fcheck_files(files, fd);
- if (!file)
- goto out_unlock;
- if (file->f_mode & FMODE_READ)
- inode->i_mode |= S_IRUSR | S_IXUSR;
- if (file->f_mode & FMODE_WRITE)
- inode->i_mode |= S_IWUSR | S_IXUSR;
- spin_unlock(&files->file_lock);
- put_files_struct(files);
inode->i_op = &proc_pid_link_inode_operations;
inode->i_size = 64;
@@ -1879,12 +1870,6 @@ static struct dentry *proc_fd_instantiate(struct inode *dir,
out:
return error;
-out_unlock:
- spin_unlock(&files->file_lock);
- put_files_struct(files);
-out_iput:
- iput(inode);
- goto out;
}
static struct dentry *proc_lookupfd_common(struct inode *dir,
@@ -2177,16 +2162,16 @@ static struct dentry *proc_map_files_lookup(struct inode *dir,
goto out;
result = ERR_PTR(-EACCES);
- if (lock_trace(task))
+ if (!ptrace_may_access(task, PTRACE_MODE_READ))
goto out_put_task;
result = ERR_PTR(-ENOENT);
if (dname_to_vma_addr(dentry, &vm_start, &vm_end))
- goto out_unlock;
+ goto out_put_task;
mm = get_task_mm(task);
if (!mm)
- goto out_unlock;
+ goto out_put_task;
down_read(&mm->mmap_sem);
vma = find_exact_vma(mm, vm_start, vm_end);
@@ -2198,8 +2183,6 @@ static struct dentry *proc_map_files_lookup(struct inode *dir,
out_no_vma:
up_read(&mm->mmap_sem);
mmput(mm);
-out_unlock:
- unlock_trace(task);
out_put_task:
put_task_struct(task);
out:
@@ -2233,7 +2216,7 @@ proc_map_files_readdir(struct file *filp, void *dirent, filldir_t filldir)
goto out;
ret = -EACCES;
- if (lock_trace(task))
+ if (!ptrace_may_access(task, PTRACE_MODE_READ))
goto out_put_task;
ret = 0;
@@ -2241,12 +2224,12 @@ proc_map_files_readdir(struct file *filp, void *dirent, filldir_t filldir)
case 0:
ino = inode->i_ino;
if (filldir(dirent, ".", 1, 0, ino, DT_DIR) < 0)
- goto out_unlock;
+ goto out_put_task;
filp->f_pos++;
case 1:
ino = parent_ino(dentry);
if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
- goto out_unlock;
+ goto out_put_task;
filp->f_pos++;
default:
{
@@ -2257,7 +2240,7 @@ proc_map_files_readdir(struct file *filp, void *dirent, filldir_t filldir)
mm = get_task_mm(task);
if (!mm)
- goto out_unlock;
+ goto out_put_task;
down_read(&mm->mmap_sem);
nr_files = 0;
@@ -2287,7 +2270,7 @@ proc_map_files_readdir(struct file *filp, void *dirent, filldir_t filldir)
flex_array_free(fa);
up_read(&mm->mmap_sem);
mmput(mm);
- goto out_unlock;
+ goto out_put_task;
}
for (i = 0, vma = mm->mmap, pos = 2; vma;
vma = vma->vm_next) {
@@ -2332,8 +2315,6 @@ proc_map_files_readdir(struct file *filp, void *dirent, filldir_t filldir)
}
}
-out_unlock:
- unlock_trace(task);
out_put_task:
put_task_struct(task);
out:
diff --git a/fs/proc/stat.c b/fs/proc/stat.c
index 6a0c62d6e442..64c3b3172367 100644
--- a/fs/proc/stat.c
+++ b/fs/proc/stat.c
@@ -18,19 +18,39 @@
#ifndef arch_irq_stat
#define arch_irq_stat() 0
#endif
-#ifndef arch_idle_time
-#define arch_idle_time(cpu) 0
-#endif
+
+#ifdef arch_idle_time
+
+static cputime64_t get_idle_time(int cpu)
+{
+ cputime64_t idle;
+
+ idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];
+ if (cpu_online(cpu) && !nr_iowait_cpu(cpu))
+ idle += arch_idle_time(cpu);
+ return idle;
+}
+
+static cputime64_t get_iowait_time(int cpu)
+{
+ cputime64_t iowait;
+
+ iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
+ if (cpu_online(cpu) && nr_iowait_cpu(cpu))
+ iowait += arch_idle_time(cpu);
+ return iowait;
+}
+
+#else
static u64 get_idle_time(int cpu)
{
u64 idle, idle_time = get_cpu_idle_time_us(cpu, NULL);
- if (idle_time == -1ULL) {
+ if (idle_time == -1ULL)
/* !NO_HZ so we can rely on cpustat.idle */
idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];
- idle += arch_idle_time(cpu);
- } else
+ else
idle = usecs_to_cputime64(idle_time);
return idle;
@@ -49,6 +69,8 @@ static u64 get_iowait_time(int cpu)
return iowait;
}
+#endif
+
static int show_stat(struct seq_file *p, void *v)
{
int i, j;
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 2b9a7607cbd5..1030a716d155 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -597,9 +597,6 @@ static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
if (!page)
continue;
- if (PageReserved(page))
- continue;
-
/* Clear accessed and referenced bits. */
ptep_test_and_clear_young(vma, addr, pte);
ClearPageReferenced(page);
@@ -750,6 +747,8 @@ static void pte_to_pagemap_entry(pagemap_entry_t *pme, pte_t pte)
else if (pte_present(pte))
*pme = make_pme(PM_PFRAME(pte_pfn(pte))
| PM_PSHIFT(PAGE_SHIFT) | PM_PRESENT);
+ else
+ *pme = make_pme(PM_NOT_PRESENT);
}
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
@@ -764,6 +763,8 @@ static void thp_pmd_to_pagemap_entry(pagemap_entry_t *pme,
if (pmd_present(pmd))
*pme = make_pme(PM_PFRAME(pmd_pfn(pmd) + offset)
| PM_PSHIFT(PAGE_SHIFT) | PM_PRESENT);
+ else
+ *pme = make_pme(PM_NOT_PRESENT);
}
#else
static inline void thp_pmd_to_pagemap_entry(pagemap_entry_t *pme,
@@ -804,8 +805,10 @@ static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
/* check to see if we've left 'vma' behind
* and need a new, higher one */
- if (vma && (addr >= vma->vm_end))
+ if (vma && (addr >= vma->vm_end)) {
vma = find_vma(walk->mm, addr);
+ pme = make_pme(PM_NOT_PRESENT);
+ }
/* check that 'vma' actually covers this address,
* and that it isn't a huge page vma */
@@ -833,6 +836,8 @@ static void huge_pte_to_pagemap_entry(pagemap_entry_t *pme,
if (pte_present(pte))
*pme = make_pme(PM_PFRAME(pte_pfn(pte) + offset)
| PM_PSHIFT(PAGE_SHIFT) | PM_PRESENT);
+ else
+ *pme = make_pme(PM_NOT_PRESENT);
}
/* This function walks within one hugetlb entry in the single call */
@@ -842,7 +847,7 @@ static int pagemap_hugetlb_range(pte_t *pte, unsigned long hmask,
{
struct pagemapread *pm = walk->private;
int err = 0;
- pagemap_entry_t pme = make_pme(PM_NOT_PRESENT);
+ pagemap_entry_t pme;
for (; addr != end; addr += PAGE_SIZE) {
int offset = (addr & ~hmask) >> PAGE_SHIFT;
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 04:47:40 +0000