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| author | Juergen Gross <jgross@suse.com> | 2026-03-27 14:13:38 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2026-04-30 11:13:05 +0200 |
| commit | 52cecff98bda2c51eed1c6ce9d21c5d6268fb19d (patch) | |
| tree | bb2fc5241e163a362e5da13b3c5efc0972160ee1 /tools/perf/scripts/python/flamegraph.py | |
| parent | bff90486aa66dbad83a0777f3c17e34fcf26a3e5 (diff) | |
Buffer overflow in drivers/xen/sys-hypervisor.c
commit 27fdbab4221b375de54bf91919798d88520c6e28 upstream.
The build id returned by HYPERVISOR_xen_version(XENVER_build_id) is
neither NUL terminated nor a string.
The first causes a buffer overflow as sprintf in buildid_show will
read and copy till it finds a NUL.
00000000 f4 91 51 f4 dd 38 9e 9d 65 47 52 eb 10 71 db 50 |..Q..8..eGR..q.P|
00000010 b9 a8 01 42 6f 2e 32 |...Bo.2|
00000017
So use a memcpy instead of sprintf to have the correct value:
00000000 f4 91 51 f4 dd 00 9e 9d 65 47 52 eb 10 71 db 50 |..Q.....eGR..q.P|
00000010 b9 a8 01 42 |...B|
00000014
(the above have a hack to embed a zero inside and check it's
returned correctly).
This is XSA-485 / CVE-2026-31786
Fixes: 84b7625728ea ("xen: add sysfs node for hypervisor build id")
Signed-off-by: Frediano Ziglio <frediano.ziglio@citrix.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/perf/scripts/python/flamegraph.py')
0 files changed, 0 insertions, 0 deletions