fuse: add a flag FUSE_SETXATTR_ACL_KILL_SGID to kill SGID

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When posix access ACL is set, it can have an effect on file mode and it can
also need to clear SGID if.

- None of caller's group/supplementary groups match file owner group.
AND
- Caller is not priviliged (No CAP_FSETID).

As of now fuser server is responsible for changing the file mode as
well. But it does not know whether to clear SGID or not.

So add a flag FUSE_SETXATTR_ACL_KILL_SGID and send this info with SETXATTR
to let file server know that sgid needs to be cleared as well.

Reported-by: Luis Henriques <lhenriques@suse.de>
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

...

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Vivek Goyal 2021-03-25 11:18:23 -04:00 • committed by Miklos Szeredi

parent 52a4c95f4d

commit 550a7d3bc0

2 changed files with 13 additions and 1 deletions

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7

include/uapi/linux/fuse.h

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