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| author |   Michael Bommarito <michael.bommarito@gmail.com> | 2026-04-20 09:50:58 -0400 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2026-04-27 07:30:18 -0600 |
| commit | f8488c07bea2431ee12a6067d736578064fa46b4 (patch) | |
| tree | 7ca9013a295c17ae589bfae2022c5b131c91a246 /kernel/liveupdate/ssh:/git@git.zx2c4.com | |
| parent | smb: server: fix max_connections off-by-one in tcp accept path (diff) | |
smb: client: require a full NFS mode SID before reading mode bits
commit 2757ad3e4b6f9e0fed4c7739594e702abc5cab21 upstream.
parse_dacl() treats an ACE SID matching sid_unix_NFS_mode as an NFS
mode SID and reads sid.sub_auth[2] to recover the mode bits.
That assumes the ACE carries three subauthorities, but compare_sids()
only compares min(a, b) subauthorities. A malicious server can return
an ACE with num_subauth = 2 and sub_auth[] = {88, 3}, which still
matches sid_unix_NFS_mode and then drives the sub_auth[2] read four
bytes past the end of the ACE.
Require num_subauth >= 3 before treating the ACE as an NFS mode SID.
This keeps the fix local to the special-SID mode path without changing
compare_sids() semantics for the rest of cifsacl.
Fixes: e2f8fbfb8d09 ("cifs: get mode bits from special sid on stat")
Cc: stable@vger.kernel.org
Assisted-by: Claude:claude-opus-4-6
Signed-off-by: Michael Bommarito <michael.bommarito@gmail.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/liveupdate/ssh:/git@git.zx2c4.com')
0 files changed, 0 insertions, 0 deletions