fs: Check for invalid i_uid in may_follow_link()

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Filesystem uids which don't map into a user namespace may result
in inode->i_uid being INVALID_UID. A symlink and its parent
could have different owners in the filesystem can both get
mapped to INVALID_UID, which may result in following a symlink
when this would not have otherwise been permitted when protected
symlinks are enabled.

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>

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Seth Forshee 2016-04-26 14:36:23 -05:00 • committed by Eric W. Biederman

parent 0d4d717f25

commit 2d7f9e2ad3

1 changed files with 3 additions and 1 deletions

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fs/namei.c

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