| From bippy-1.2.0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@kernel.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2024-49933: blk_iocost: fix more out of bound shifts |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| blk_iocost: fix more out of bound shifts |
| |
| Recently running UBSAN caught few out of bound shifts in the |
| ioc_forgive_debts() function: |
| |
| UBSAN: shift-out-of-bounds in block/blk-iocost.c:2142:38 |
| shift exponent 80 is too large for 64-bit type 'u64' (aka 'unsigned long |
| long') |
| ... |
| UBSAN: shift-out-of-bounds in block/blk-iocost.c:2144:30 |
| shift exponent 80 is too large for 64-bit type 'u64' (aka 'unsigned long |
| long') |
| ... |
| Call Trace: |
| <IRQ> |
| dump_stack_lvl+0xca/0x130 |
| __ubsan_handle_shift_out_of_bounds+0x22c/0x280 |
| ? __lock_acquire+0x6441/0x7c10 |
| ioc_timer_fn+0x6cec/0x7750 |
| ? blk_iocost_init+0x720/0x720 |
| ? call_timer_fn+0x5d/0x470 |
| call_timer_fn+0xfa/0x470 |
| ? blk_iocost_init+0x720/0x720 |
| __run_timer_base+0x519/0x700 |
| ... |
| |
| Actual impact of this issue was not identified but I propose to fix the |
| undefined behaviour. |
| The proposed fix to prevent those out of bound shifts consist of |
| precalculating exponent before using it the shift operations by taking |
| min value from the actual exponent and maximum possible number of bits. |
| |
| The Linux kernel CVE team has assigned CVE-2024-49933 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.10 with commit bec02dbbafad534674309f8b948094900f456797 and fixed in 5.10.227 with commit 1f61d509257d6a05763d05bf37943b35306522b1 |
| Issue introduced in 5.10 with commit bec02dbbafad534674309f8b948094900f456797 and fixed in 5.15.168 with commit f4ef9bef023d5c543cb0f3194ecacfd47ef590ec |
| Issue introduced in 5.10 with commit bec02dbbafad534674309f8b948094900f456797 and fixed in 6.1.113 with commit 59121bb38fdc01434ea3fe361ee02b59f036227f |
| Issue introduced in 5.10 with commit bec02dbbafad534674309f8b948094900f456797 and fixed in 6.6.55 with commit 1ab2cfe19700fb3dde4c7dfec392acff34db3120 |
| Issue introduced in 5.10 with commit bec02dbbafad534674309f8b948094900f456797 and fixed in 6.10.14 with commit 1b120f151871eb47ce9f283c007af3f8ae1d990e |
| Issue introduced in 5.10 with commit bec02dbbafad534674309f8b948094900f456797 and fixed in 6.11.3 with commit 364022095bdd4108efdaaa68576afa4712a5d085 |
| Issue introduced in 5.10 with commit bec02dbbafad534674309f8b948094900f456797 and fixed in 6.12 with commit 9bce8005ec0dcb23a58300e8522fe4a31da606fa |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2024-49933 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| block/blk-iocost.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/1f61d509257d6a05763d05bf37943b35306522b1 |
| https://git.kernel.org/stable/c/f4ef9bef023d5c543cb0f3194ecacfd47ef590ec |
| https://git.kernel.org/stable/c/59121bb38fdc01434ea3fe361ee02b59f036227f |
| https://git.kernel.org/stable/c/1ab2cfe19700fb3dde4c7dfec392acff34db3120 |
| https://git.kernel.org/stable/c/1b120f151871eb47ce9f283c007af3f8ae1d990e |
| https://git.kernel.org/stable/c/364022095bdd4108efdaaa68576afa4712a5d085 |
| https://git.kernel.org/stable/c/9bce8005ec0dcb23a58300e8522fe4a31da606fa |
