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-rw-r--r--security/selinux/hooks.c144
-rw-r--r--security/selinux/include/classmap.h30
-rw-r--r--security/selinux/include/conditional.h2
-rw-r--r--security/selinux/include/objsec.h5
-rw-r--r--security/selinux/ss/services.c6
5 files changed, 127 insertions, 60 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 912deee3f01e..a00ab81ab719 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -259,7 +259,7 @@ static int __inode_security_revalidate(struct inode *inode,
might_sleep_if(may_sleep);
- if (isec->initialized == LABEL_INVALID) {
+ if (ss_initialized && isec->initialized != LABEL_INITIALIZED) {
if (!may_sleep)
return -ECHILD;
@@ -297,6 +297,13 @@ static struct inode_security_struct *inode_security(struct inode *inode)
return inode->i_security;
}
+static struct inode_security_struct *backing_inode_security_novalidate(struct dentry *dentry)
+{
+ struct inode *inode = d_backing_inode(dentry);
+
+ return inode->i_security;
+}
+
/*
* Get the security label of a dentry's backing inode.
*/
@@ -686,7 +693,7 @@ static int selinux_set_mnt_opts(struct super_block *sb,
struct superblock_security_struct *sbsec = sb->s_security;
const char *name = sb->s_type->name;
struct dentry *root = sbsec->sb->s_root;
- struct inode_security_struct *root_isec = backing_inode_security(root);
+ struct inode_security_struct *root_isec;
u32 fscontext_sid = 0, context_sid = 0, rootcontext_sid = 0;
u32 defcontext_sid = 0;
char **mount_options = opts->mnt_opts;
@@ -729,6 +736,8 @@ static int selinux_set_mnt_opts(struct super_block *sb,
&& (num_opts == 0))
goto out;
+ root_isec = backing_inode_security_novalidate(root);
+
/*
* parse the mount options, check if they are valid sids.
* also check if someone is trying to mount the same sb more
@@ -1622,7 +1631,7 @@ static int current_has_perm(const struct task_struct *tsk,
/* Check whether a task is allowed to use a capability. */
static int cred_has_capability(const struct cred *cred,
- int cap, int audit)
+ int cap, int audit, bool initns)
{
struct common_audit_data ad;
struct av_decision avd;
@@ -1636,10 +1645,10 @@ static int cred_has_capability(const struct cred *cred,
switch (CAP_TO_INDEX(cap)) {
case 0:
- sclass = SECCLASS_CAPABILITY;
+ sclass = initns ? SECCLASS_CAPABILITY : SECCLASS_CAP_USERNS;
break;
case 1:
- sclass = SECCLASS_CAPABILITY2;
+ sclass = initns ? SECCLASS_CAPABILITY2 : SECCLASS_CAP2_USERNS;
break;
default:
printk(KERN_ERR
@@ -1781,7 +1790,6 @@ static int selinux_determine_inode_label(struct inode *dir,
u32 *_new_isid)
{
const struct superblock_security_struct *sbsec = dir->i_sb->s_security;
- const struct inode_security_struct *dsec = inode_security(dir);
const struct task_security_struct *tsec = current_security();
if ((sbsec->flags & SE_SBINITIALIZED) &&
@@ -1791,6 +1799,7 @@ static int selinux_determine_inode_label(struct inode *dir,
tsec->create_sid) {
*_new_isid = tsec->create_sid;
} else {
+ const struct inode_security_struct *dsec = inode_security(dir);
return security_transition_sid(tsec->sid, dsec->sid, tclass,
name, _new_isid);
}
@@ -2075,7 +2084,7 @@ static int selinux_binder_transfer_file(struct task_struct *from,
u32 sid = task_sid(to);
struct file_security_struct *fsec = file->f_security;
struct dentry *dentry = file->f_path.dentry;
- struct inode_security_struct *isec = backing_inode_security(dentry);
+ struct inode_security_struct *isec;
struct common_audit_data ad;
int rc;
@@ -2094,6 +2103,7 @@ static int selinux_binder_transfer_file(struct task_struct *from,
if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
return 0;
+ isec = backing_inode_security(dentry);
return avc_has_perm(sid, isec->sid, isec->sclass, file_to_av(file),
&ad);
}
@@ -2142,7 +2152,7 @@ static int selinux_capset(struct cred *new, const struct cred *old,
static int selinux_capable(const struct cred *cred, struct user_namespace *ns,
int cap, int audit)
{
- return cred_has_capability(cred, cap, audit);
+ return cred_has_capability(cred, cap, audit, ns == &init_user_ns);
}
static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb)
@@ -2220,7 +2230,7 @@ static int selinux_vm_enough_memory(struct mm_struct *mm, long pages)
int rc, cap_sys_admin = 0;
rc = cred_has_capability(current_cred(), CAP_SYS_ADMIN,
- SECURITY_CAP_NOAUDIT);
+ SECURITY_CAP_NOAUDIT, true);
if (rc == 0)
cap_sys_admin = 1;
@@ -2229,6 +2239,20 @@ static int selinux_vm_enough_memory(struct mm_struct *mm, long pages)
/* binprm security operations */
+static u32 ptrace_parent_sid(struct task_struct *task)
+{
+ u32 sid = 0;
+ struct task_struct *tracer;
+
+ rcu_read_lock();
+ tracer = ptrace_parent(task);
+ if (tracer)
+ sid = task_sid(tracer);
+ rcu_read_unlock();
+
+ return sid;
+}
+
static int check_nnp_nosuid(const struct linux_binprm *bprm,
const struct task_security_struct *old_tsec,
const struct task_security_struct *new_tsec)
@@ -2350,18 +2374,7 @@ static int selinux_bprm_set_creds(struct linux_binprm *bprm)
* changes its SID has the appropriate permit */
if (bprm->unsafe &
(LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) {
- struct task_struct *tracer;
- struct task_security_struct *sec;
- u32 ptsid = 0;
-
- rcu_read_lock();
- tracer = ptrace_parent(current);
- if (likely(tracer != NULL)) {
- sec = __task_cred(tracer)->security;
- ptsid = sec->sid;
- }
- rcu_read_unlock();
-
+ u32 ptsid = ptrace_parent_sid(current);
if (ptsid != 0) {
rc = avc_has_perm(ptsid, new_tsec->sid,
SECCLASS_PROCESS,
@@ -3045,7 +3058,7 @@ static int selinux_inode_setxattr(struct dentry *dentry, const char *name,
const void *value, size_t size, int flags)
{
struct inode *inode = d_backing_inode(dentry);
- struct inode_security_struct *isec = backing_inode_security(dentry);
+ struct inode_security_struct *isec;
struct superblock_security_struct *sbsec;
struct common_audit_data ad;
u32 newsid, sid = current_sid();
@@ -3064,6 +3077,7 @@ static int selinux_inode_setxattr(struct dentry *dentry, const char *name,
ad.type = LSM_AUDIT_DATA_DENTRY;
ad.u.dentry = dentry;
+ isec = backing_inode_security(dentry);
rc = avc_has_perm(sid, isec->sid, isec->sclass,
FILE__RELABELFROM, &ad);
if (rc)
@@ -3122,7 +3136,7 @@ static void selinux_inode_post_setxattr(struct dentry *dentry, const char *name,
int flags)
{
struct inode *inode = d_backing_inode(dentry);
- struct inode_security_struct *isec = backing_inode_security(dentry);
+ struct inode_security_struct *isec;
u32 newsid;
int rc;
@@ -3139,6 +3153,7 @@ static void selinux_inode_post_setxattr(struct dentry *dentry, const char *name,
return;
}
+ isec = backing_inode_security(dentry);
isec->sclass = inode_mode_to_security_class(inode->i_mode);
isec->sid = newsid;
isec->initialized = LABEL_INITIALIZED;
@@ -3180,7 +3195,7 @@ static int selinux_inode_getsecurity(struct inode *inode, const char *name, void
u32 size;
int error;
char *context = NULL;
- struct inode_security_struct *isec = inode_security(inode);
+ struct inode_security_struct *isec;
if (strcmp(name, XATTR_SELINUX_SUFFIX))
return -EOPNOTSUPP;
@@ -3198,7 +3213,8 @@ static int selinux_inode_getsecurity(struct inode *inode, const char *name, void
SECURITY_CAP_NOAUDIT);
if (!error)
error = cred_has_capability(current_cred(), CAP_MAC_ADMIN,
- SECURITY_CAP_NOAUDIT);
+ SECURITY_CAP_NOAUDIT, true);
+ isec = inode_security(inode);
if (!error)
error = security_sid_to_context_force(isec->sid, &context,
&size);
@@ -3219,7 +3235,7 @@ out_nofree:
static int selinux_inode_setsecurity(struct inode *inode, const char *name,
const void *value, size_t size, int flags)
{
- struct inode_security_struct *isec = inode_security(inode);
+ struct inode_security_struct *isec = inode_security_novalidate(inode);
u32 newsid;
int rc;
@@ -3308,7 +3324,7 @@ static int ioctl_has_perm(const struct cred *cred, struct file *file,
struct common_audit_data ad;
struct file_security_struct *fsec = file->f_security;
struct inode *inode = file_inode(file);
- struct inode_security_struct *isec = inode_security(inode);
+ struct inode_security_struct *isec;
struct lsm_ioctlop_audit ioctl;
u32 ssid = cred_sid(cred);
int rc;
@@ -3332,6 +3348,7 @@ static int ioctl_has_perm(const struct cred *cred, struct file *file,
if (unlikely(IS_PRIVATE(inode)))
return 0;
+ isec = inode_security(inode);
rc = avc_has_extended_perms(ssid, isec->sid, isec->sclass,
requested, driver, xperm, &ad);
out:
@@ -3373,7 +3390,7 @@ static int selinux_file_ioctl(struct file *file, unsigned int cmd,
case KDSKBENT:
case KDSKBSENT:
error = cred_has_capability(cred, CAP_SYS_TTY_CONFIG,
- SECURITY_CAP_AUDIT);
+ SECURITY_CAP_AUDIT, true);
break;
/* default case assumes that the command will go
@@ -3462,8 +3479,9 @@ static int selinux_file_mprotect(struct vm_area_struct *vma,
vma->vm_end <= vma->vm_mm->brk) {
rc = cred_has_perm(cred, cred, PROCESS__EXECHEAP);
} else if (!vma->vm_file &&
- vma->vm_start <= vma->vm_mm->start_stack &&
- vma->vm_end >= vma->vm_mm->start_stack) {
+ ((vma->vm_start <= vma->vm_mm->start_stack &&
+ vma->vm_end >= vma->vm_mm->start_stack) ||
+ vma_is_stack_for_task(vma, current))) {
rc = current_has_perm(current, PROCESS__EXECSTACK);
} else if (vma->vm_file && vma->anon_vma) {
/*
@@ -3719,6 +3737,52 @@ static int selinux_kernel_module_request(char *kmod_name)
SYSTEM__MODULE_REQUEST, &ad);
}
+static int selinux_kernel_module_from_file(struct file *file)
+{
+ struct common_audit_data ad;
+ struct inode_security_struct *isec;
+ struct file_security_struct *fsec;
+ u32 sid = current_sid();
+ int rc;
+
+ /* init_module */
+ if (file == NULL)
+ return avc_has_perm(sid, sid, SECCLASS_SYSTEM,
+ SYSTEM__MODULE_LOAD, NULL);
+
+ /* finit_module */
+
+ ad.type = LSM_AUDIT_DATA_PATH;
+ ad.u.path = file->f_path;
+
+ fsec = file->f_security;
+ if (sid != fsec->sid) {
+ rc = avc_has_perm(sid, fsec->sid, SECCLASS_FD, FD__USE, &ad);
+ if (rc)
+ return rc;
+ }
+
+ isec = inode_security(file_inode(file));
+ return avc_has_perm(sid, isec->sid, SECCLASS_SYSTEM,
+ SYSTEM__MODULE_LOAD, &ad);
+}
+
+static int selinux_kernel_read_file(struct file *file,
+ enum kernel_read_file_id id)
+{
+ int rc = 0;
+
+ switch (id) {
+ case READING_MODULE:
+ rc = selinux_kernel_module_from_file(file);
+ break;
+ default:
+ break;
+ }
+
+ return rc;
+}
+
static int selinux_task_setpgid(struct task_struct *p, pid_t pgid)
{
return current_has_perm(p, PROCESS__SETPGID);
@@ -4598,6 +4662,7 @@ static int selinux_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *
{
u32 peer_secid = SECSID_NULL;
u16 family;
+ struct inode_security_struct *isec;
if (skb && skb->protocol == htons(ETH_P_IP))
family = PF_INET;
@@ -4608,9 +4673,10 @@ static int selinux_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *
else
goto out;
- if (sock && family == PF_UNIX)
- selinux_inode_getsecid(SOCK_INODE(sock), &peer_secid);
- else if (skb)
+ if (sock && family == PF_UNIX) {
+ isec = inode_security_novalidate(SOCK_INODE(sock));
+ peer_secid = isec->sid;
+ } else if (skb)
selinux_skb_peerlbl_sid(skb, family, &peer_secid);
out:
@@ -5675,7 +5741,6 @@ static int selinux_setprocattr(struct task_struct *p,
char *name, void *value, size_t size)
{
struct task_security_struct *tsec;
- struct task_struct *tracer;
struct cred *new;
u32 sid = 0, ptsid;
int error;
@@ -5782,14 +5847,8 @@ static int selinux_setprocattr(struct task_struct *p,
/* Check for ptracing, and update the task SID if ok.
Otherwise, leave SID unchanged and fail. */
- ptsid = 0;
- rcu_read_lock();
- tracer = ptrace_parent(p);
- if (tracer)
- ptsid = task_sid(tracer);
- rcu_read_unlock();
-
- if (tracer) {
+ ptsid = ptrace_parent_sid(p);
+ if (ptsid != 0) {
error = avc_has_perm(ptsid, sid, SECCLASS_PROCESS,
PROCESS__PTRACE, NULL);
if (error)
@@ -6020,6 +6079,7 @@ static struct security_hook_list selinux_hooks[] = {
LSM_HOOK_INIT(kernel_act_as, selinux_kernel_act_as),
LSM_HOOK_INIT(kernel_create_files_as, selinux_kernel_create_files_as),
LSM_HOOK_INIT(kernel_module_request, selinux_kernel_module_request),
+ LSM_HOOK_INIT(kernel_read_file, selinux_kernel_read_file),
LSM_HOOK_INIT(task_setpgid, selinux_task_setpgid),
LSM_HOOK_INIT(task_getpgid, selinux_task_getpgid),
LSM_HOOK_INIT(task_getsid, selinux_task_getsid),
diff --git a/security/selinux/include/classmap.h b/security/selinux/include/classmap.h
index ef83c4b85a33..1f1f4b2f6018 100644
--- a/security/selinux/include/classmap.h
+++ b/security/selinux/include/classmap.h
@@ -12,6 +12,18 @@
#define COMMON_IPC_PERMS "create", "destroy", "getattr", "setattr", "read", \
"write", "associate", "unix_read", "unix_write"
+#define COMMON_CAP_PERMS "chown", "dac_override", "dac_read_search", \
+ "fowner", "fsetid", "kill", "setgid", "setuid", "setpcap", \
+ "linux_immutable", "net_bind_service", "net_broadcast", \
+ "net_admin", "net_raw", "ipc_lock", "ipc_owner", "sys_module", \
+ "sys_rawio", "sys_chroot", "sys_ptrace", "sys_pacct", "sys_admin", \
+ "sys_boot", "sys_nice", "sys_resource", "sys_time", \
+ "sys_tty_config", "mknod", "lease", "audit_write", \
+ "audit_control", "setfcap"
+
+#define COMMON_CAP2_PERMS "mac_override", "mac_admin", "syslog", \
+ "wake_alarm", "block_suspend", "audit_read"
+
/*
* Note: The name for any socket class should be suffixed by "socket",
* and doesn't contain more than one substr of "socket".
@@ -32,16 +44,9 @@ struct security_class_mapping secclass_map[] = {
"setsockcreate", NULL } },
{ "system",
{ "ipc_info", "syslog_read", "syslog_mod",
- "syslog_console", "module_request", NULL } },
+ "syslog_console", "module_request", "module_load", NULL } },
{ "capability",
- { "chown", "dac_override", "dac_read_search",
- "fowner", "fsetid", "kill", "setgid", "setuid", "setpcap",
- "linux_immutable", "net_bind_service", "net_broadcast",
- "net_admin", "net_raw", "ipc_lock", "ipc_owner", "sys_module",
- "sys_rawio", "sys_chroot", "sys_ptrace", "sys_pacct", "sys_admin",
- "sys_boot", "sys_nice", "sys_resource", "sys_time",
- "sys_tty_config", "mknod", "lease", "audit_write",
- "audit_control", "setfcap", NULL } },
+ { COMMON_CAP_PERMS, NULL } },
{ "filesystem",
{ "mount", "remount", "unmount", "getattr",
"relabelfrom", "relabelto", "associate", "quotamod",
@@ -150,12 +155,15 @@ struct security_class_mapping secclass_map[] = {
{ "memprotect", { "mmap_zero", NULL } },
{ "peer", { "recv", NULL } },
{ "capability2",
- { "mac_override", "mac_admin", "syslog", "wake_alarm", "block_suspend",
- "audit_read", NULL } },
+ { COMMON_CAP2_PERMS, NULL } },
{ "kernel_service", { "use_as_override", "create_files_as", NULL } },
{ "tun_socket",
{ COMMON_SOCK_PERMS, "attach_queue", NULL } },
{ "binder", { "impersonate", "call", "set_context_mgr", "transfer",
NULL } },
+ { "cap_userns",
+ { COMMON_CAP_PERMS, NULL } },
+ { "cap2_userns",
+ { COMMON_CAP2_PERMS, NULL } },
{ NULL }
};
diff --git a/security/selinux/include/conditional.h b/security/selinux/include/conditional.h
index 67ce7a8d8301..ff4fddca9050 100644
--- a/security/selinux/include/conditional.h
+++ b/security/selinux/include/conditional.h
@@ -17,6 +17,6 @@ int security_get_bools(int *len, char ***names, int **values);
int security_set_bools(int len, int *values);
-int security_get_bool_value(int bool);
+int security_get_bool_value(int index);
#endif
diff --git a/security/selinux/include/objsec.h b/security/selinux/include/objsec.h
index a2ae05414ba1..c21e135460a5 100644
--- a/security/selinux/include/objsec.h
+++ b/security/selinux/include/objsec.h
@@ -38,9 +38,8 @@ struct task_security_struct {
};
enum label_initialized {
- LABEL_MISSING, /* not initialized */
- LABEL_INITIALIZED, /* inizialized */
- LABEL_INVALID /* invalid */
+ LABEL_INVALID, /* invalid or not initialized */
+ LABEL_INITIALIZED /* initialized */
};
struct inode_security_struct {
diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index ebda97333f1b..89df64672b89 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -2696,7 +2696,7 @@ out:
return rc;
}
-int security_get_bool_value(int bool)
+int security_get_bool_value(int index)
{
int rc;
int len;
@@ -2705,10 +2705,10 @@ int security_get_bool_value(int bool)
rc = -EFAULT;
len = policydb.p_bools.nprim;
- if (bool >= len)
+ if (index >= len)
goto out;
- rc = policydb.bool_val_to_struct[bool]->state;
+ rc = policydb.bool_val_to_struct[index]->state;
out:
read_unlock(&policy_rwlock);
return rc;
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-30 07:42:32 +0000