Searched hist:"2 d8ae8c4" (Results 1 – 1 of 1) sorted by relevance
/openbmc/linux/fs/nfsd/ |
H A D | vfs.c | 2d8ae8c4 Tue May 02 08:36:02 CDT 2023 Christian Brauner <brauner@kernel.org> nfsd: use vfs setgid helper
We've aligned setgid behavior over multiple kernel releases. The details can be found in commit cf619f891971 ("Merge tag 'fs.ovl.setgid.v6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/idmapping") and commit 426b4ca2d6a5 ("Merge tag 'fs.setgid.v6.0' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux"). Consistent setgid stripping behavior is now encapsulated in the setattr_should_drop_sgid() helper which is used by all filesystems that strip setgid bits outside of vfs proper. Usually ATTR_KILL_SGID is raised in e.g., chown_common() and is subject to the setattr_should_drop_sgid() check to determine whether the setgid bit can be retained. Since nfsd is raising ATTR_KILL_SGID unconditionally it will cause notify_change() to strip it even if the caller had the necessary privileges to retain it. Ensure that nfsd only raises ATR_KILL_SGID if the caller lacks the necessary privileges to retain the setgid bit.
Without this patch the setgid stripping tests in LTP will fail:
> As you can see, the problem is S_ISGID (0002000) was dropped on a > non-group-executable file while chown was invoked by super-user, while
[...]
> fchown02.c:66: TFAIL: testfile2: wrong mode permissions 0100700, expected 0102700
[...]
> chown02.c:57: TFAIL: testfile2: wrong mode permissions 0100700, expected 0102700
With this patch all tests pass.
Reported-by: Sherry Yang <sherry.yang@oracle.com> Signed-off-by: Christian Brauner <brauner@kernel.org> Reviewed-by: Jeff Layton <jlayton@kernel.org> Cc: <stable@vger.kernel.org> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
|