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authorKees Cook <keescook@chromium.org>2017-06-21 19:53:06 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2017-06-30 03:08:32 +0300
commitcc658db47d6897a8571fb6227f59d1d18151b0b2 (patch)
tree67d1bd8c5c8f3f7c90a6f24c39832fc0218de07a
parent41124db869b7e00e12052555f8987867ac01d70c (diff)
downloadlinux-cc658db47d6897a8571fb6227f59d1d18151b0b2.tar.xz
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>
-rw-r--r--fs/inode.c2
-rw-r--r--fs/namei.c2
2 files changed, 2 insertions, 2 deletions
diff --git a/fs/inode.c b/fs/inode.c
index db5914783a71..7092debe90cc 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -2023,7 +2023,7 @@ bool inode_owner_or_capable(const struct inode *inode)
return true;
ns = current_user_ns();
- if (ns_capable(ns, CAP_FOWNER) && kuid_has_mapping(ns, inode->i_uid))
+ if (kuid_has_mapping(ns, inode->i_uid) && ns_capable(ns, CAP_FOWNER))
return true;
return false;
}
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);