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-rw-r--r--fs/open.c31
1 files changed, 15 insertions, 16 deletions
diff --git a/fs/open.c b/fs/open.c
index f96eaab280a3..c0a426d5766c 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -425,30 +425,33 @@ out:
*/
asmlinkage long sys_faccessat(int dfd, const char __user *filename, int mode)
{
- struct cred *cred = current->cred;
+ const struct cred *old_cred;
+ struct cred *override_cred;
struct path path;
struct inode *inode;
- int old_fsuid, old_fsgid;
- kernel_cap_t uninitialized_var(old_cap); /* !SECURE_NO_SETUID_FIXUP */
int res;
if (mode & ~S_IRWXO) /* where's F_OK, X_OK, W_OK, R_OK? */
return -EINVAL;
- old_fsuid = cred->fsuid;
- old_fsgid = cred->fsgid;
+ override_cred = prepare_creds();
+ if (!override_cred)
+ return -ENOMEM;
- cred->fsuid = cred->uid;
- cred->fsgid = cred->gid;
+ override_cred->fsuid = override_cred->uid;
+ override_cred->fsgid = override_cred->gid;
if (!issecure(SECURE_NO_SETUID_FIXUP)) {
/* Clear the capabilities if we switch to a non-root user */
- if (current->cred->uid)
- old_cap = cap_set_effective(__cap_empty_set);
+ if (override_cred->uid)
+ cap_clear(override_cred->cap_effective);
else
- old_cap = cap_set_effective(cred->cap_permitted);
+ override_cred->cap_effective =
+ override_cred->cap_permitted;
}
+ old_cred = override_creds(override_cred);
+
res = user_path_at(dfd, filename, LOOKUP_FOLLOW, &path);
if (res)
goto out;
@@ -485,12 +488,8 @@ asmlinkage long sys_faccessat(int dfd, const char __user *filename, int mode)
out_path_release:
path_put(&path);
out:
- cred->fsuid = old_fsuid;
- cred->fsgid = old_fsgid;
-
- if (!issecure(SECURE_NO_SETUID_FIXUP))
- cap_set_effective(old_cap);
-
+ revert_creds(old_cred);
+ put_cred(override_cred);
return res;
}