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| author | Florian-Ewald Mueller <florian-ewald.mueller@ionos.com> | 2022-10-25 09:37:05 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-18 11:41:49 +0100 |
| commit | 2c4832a0893a47068a660049bedf9c6b3f08f640 (patch) | |
| tree | 54553b4d522deb105b3e1cfc849819fce8274678 /security | |
| parent | b869cb7a3d524040966a08487fa9003bc7856aa9 (diff) | |
md/bitmap: Fix bitmap chunk size overflow issues
commit 4555211190798b6b6fa2c37667d175bf67945c78 upstream.
- limit bitmap chunk size internal u64 variable to values not overflowing
the u32 bitmap superblock structure variable stored on persistent media
- assign bitmap chunk size internal u64 variable from unsigned values to
avoid possible sign extension artifacts when assigning from a s32 value
The bug has been there since at least kernel 4.0.
Steps to reproduce it:
1: mdadm -C /dev/mdx -l 1 --bitmap=internal --bitmap-chunk=256M -e 1.2
-n2 /dev/rnbd1 /dev/rnbd2
2 resize member device rnbd1 and rnbd2 to 8 TB
3 mdadm --grow /dev/mdx --size=max
The bitmap_chunksize will overflow without patch.
Cc: stable@vger.kernel.org
Signed-off-by: Florian-Ewald Mueller <florian-ewald.mueller@ionos.com>
Signed-off-by: Jack Wang <jinpu.wang@ionos.com>
Signed-off-by: Song Liu <song@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'security')
0 files changed, 0 insertions, 0 deletions