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authorLinus Torvalds <torvalds@linux-foundation.org>2017-05-12 11:39:59 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-05-12 11:39:59 -0700
commit050453295f808dd683b9a88f58a1b29540097394 (patch)
tree1d43b39b72779d9133de345a96a6ea92cf96582c /fs/open.c
parente0c4a5fc750e22c6f8d5c1ab7cc18592b88852ab (diff)
parent4f757f3cbf54edef7b75c68d6d6d2f1a0ca08d2e (diff)
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Merge branch 'work.sane_pwd' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull misc vfs updates from Al Viro: "Making sure that something like a referral point won't end up as pwd or root. The main part is the last commit (fixing mntns_install()); that one fixes a hard-to-hit race. The fchdir() commit is making fchdir(2) a bit more robust - it should be impossible to get opened files (even O_PATH ones) for referral points in the first place, so the existing checks are OK, but checking the same thing as in chdir(2) is just as cheap. The path_init() commit removes a redundant check that shouldn't have been there in the first place" * 'work.sane_pwd' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: make sure that mntns_install() doesn't end up with referral for root path_init(): don't bother with checking MAY_EXEC for LOOKUP_ROOT make sure that fchdir() won't accept referral points, etc.
Diffstat (limited to 'fs/open.c')
-rw-r--r--fs/open.c9
1 files changed, 3 insertions, 6 deletions
diff --git a/fs/open.c b/fs/open.c
index 6d2d2b33ac54..cd0c5be8d012 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -460,20 +460,17 @@ out:
SYSCALL_DEFINE1(fchdir, unsigned int, fd)
{
struct fd f = fdget_raw(fd);
- struct inode *inode;
- int error = -EBADF;
+ int error;
error = -EBADF;
if (!f.file)
goto out;
- inode = file_inode(f.file);
-
error = -ENOTDIR;
- if (!S_ISDIR(inode->i_mode))
+ if (!d_can_lookup(f.file->f_path.dentry))
goto out_putf;
- error = inode_permission(inode, MAY_EXEC | MAY_CHDIR);
+ error = inode_permission(file_inode(f.file), MAY_EXEC | MAY_CHDIR);
if (!error)
set_fs_pwd(current->fs, &f.file->f_path);
out_putf: