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| author | Kees Cook <keescook@chromium.org> | 2017-06-21 09:53:06 -0700 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2017-06-29 20:08:32 -0400 |
| commit | cc658db47d6897a8571fb6227f59d1d18151b0b2 (patch) | |
| tree | 67d1bd8c5c8f3f7c90a6f24c39832fc0218de07a /fs/namei.c | |
| parent | 41124db869b7e00e12052555f8987867ac01d70c (diff) | |
| download | linux-cc658db47d6897a8571fb6227f59d1d18151b0b2.tar.gz linux-cc658db47d6897a8571fb6227f59d1d18151b0b2.tar.bz2 linux-cc658db47d6897a8571fb6227f59d1d18151b0b2.zip | |
fs: Reorder inode_owner_or_capable() to avoid needless
Checking for capabilities should be the last operation when performing
access control tests so that PF_SUPERPRIV is set only when it was required
for success (implying that the capability was needed for the operation).
Reported-by: Solar Designer <solar@openwall.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Serge Hallyn <serge@hallyn.com>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/namei.c')
| -rw-r--r-- | fs/namei.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/namei.c b/fs/namei.c index 6571a5f5112e..efe53a5d0737 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -1008,7 +1008,7 @@ static int may_linkat(struct path *link) /* Source inode owner (or CAP_FOWNER) can hardlink all they like, * otherwise, it must be a safe source. */ - if (inode_owner_or_capable(inode) || safe_hardlink_source(inode)) + if (safe_hardlink_source(inode) || inode_owner_or_capable(inode)) return 0; audit_log_link_denied("linkat", link); |