| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2024-38661: s390/ap: Fix crash in AP internal function modify_bitmap() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| s390/ap: Fix crash in AP internal function modify_bitmap() |
| |
| A system crash like this |
| |
| Failing address: 200000cb7df6f000 TEID: 200000cb7df6f403 |
| Fault in home space mode while using kernel ASCE. |
| AS:00000002d71bc007 R3:00000003fe5b8007 S:000000011a446000 P:000000015660c13d |
| Oops: 0038 ilc:3 [#1] PREEMPT SMP |
| Modules linked in: mlx5_ib ... |
| CPU: 8 PID: 7556 Comm: bash Not tainted 6.9.0-rc7 #8 |
| Hardware name: IBM 3931 A01 704 (LPAR) |
| Krnl PSW : 0704e00180000000 0000014b75e7b606 (ap_parse_bitmap_str+0x10e/0x1f8) |
| R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 RI:0 EA:3 |
| Krnl GPRS: 0000000000000001 ffffffffffffffc0 0000000000000001 00000048f96b75d3 |
| 000000cb00000100 ffffffffffffffff ffffffffffffffff 000000cb7df6fce0 |
| 000000cb7df6fce0 00000000ffffffff 000000000000002b 00000048ffffffff |
| 000003ff9b2dbc80 200000cb7df6fcd8 0000014bffffffc0 000000cb7df6fbc8 |
| Krnl Code: 0000014b75e7b5fc: a7840047 brc 8,0000014b75e7b68a |
| 0000014b75e7b600: 18b2 lr %r11,%r2 |
| #0000014b75e7b602: a7f4000a brc 15,0000014b75e7b616 |
| >0000014b75e7b606: eb22d00000e6 laog %r2,%r2,0(%r13) |
| 0000014b75e7b60c: a7680001 lhi %r6,1 |
| 0000014b75e7b610: 187b lr %r7,%r11 |
| 0000014b75e7b612: 84960021 brxh %r9,%r6,0000014b75e7b654 |
| 0000014b75e7b616: 18e9 lr %r14,%r9 |
| Call Trace: |
| [<0000014b75e7b606>] ap_parse_bitmap_str+0x10e/0x1f8 |
| ([<0000014b75e7b5dc>] ap_parse_bitmap_str+0xe4/0x1f8) |
| [<0000014b75e7b758>] apmask_store+0x68/0x140 |
| [<0000014b75679196>] kernfs_fop_write_iter+0x14e/0x1e8 |
| [<0000014b75598524>] vfs_write+0x1b4/0x448 |
| [<0000014b7559894c>] ksys_write+0x74/0x100 |
| [<0000014b7618a440>] __do_syscall+0x268/0x328 |
| [<0000014b761a3558>] system_call+0x70/0x98 |
| INFO: lockdep is turned off. |
| Last Breaking-Event-Address: |
| [<0000014b75e7b636>] ap_parse_bitmap_str+0x13e/0x1f8 |
| Kernel panic - not syncing: Fatal exception: panic_on_oops |
| |
| occured when /sys/bus/ap/a[pq]mask was updated with a relative mask value |
| (like +0x10-0x12,+60,-90) with one of the numeric values exceeding INT_MAX. |
| |
| The fix is simple: use unsigned long values for the internal variables. The |
| correct checks are already in place in the function but a simple int for |
| the internal variables was used with the possibility to overflow. |
| |
| The Linux kernel CVE team has assigned CVE-2024-38661 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 4.19.316 with commit 2062e3f1f2374102f8014d7ca286b9aa527bd558 |
| Fixed in 5.4.278 with commit 7c72af16abf2ec7520407098360bbba312289e05 |
| Fixed in 5.10.219 with commit 7360cef95aa1ea2b5efb7b5e2ed32e941664e1f0 |
| Fixed in 5.15.161 with commit 67011123453b91ec03671d40712fa213e94a01b9 |
| Fixed in 6.1.94 with commit 8c5f5911c1b13170d3404eb992c6a0deaa8d81ad |
| Fixed in 6.6.34 with commit 4c0bfb4e867c1ec6616a5049bd3618021e127056 |
| Fixed in 6.9.5 with commit 7dabe54a016defe11bb2a278cd9f1ff6db3feba6 |
| Fixed in 6.10 with commit d4f9d5a99a3fd1b1c691b7a1a6f8f3f25f4116c9 |
| |
| 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-2024-38661 |
| 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: |
| drivers/s390/crypto/ap_bus.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/2062e3f1f2374102f8014d7ca286b9aa527bd558 |
| https://git.kernel.org/stable/c/7c72af16abf2ec7520407098360bbba312289e05 |
| https://git.kernel.org/stable/c/7360cef95aa1ea2b5efb7b5e2ed32e941664e1f0 |
| https://git.kernel.org/stable/c/67011123453b91ec03671d40712fa213e94a01b9 |
| https://git.kernel.org/stable/c/8c5f5911c1b13170d3404eb992c6a0deaa8d81ad |
| https://git.kernel.org/stable/c/4c0bfb4e867c1ec6616a5049bd3618021e127056 |
| https://git.kernel.org/stable/c/7dabe54a016defe11bb2a278cd9f1ff6db3feba6 |
| https://git.kernel.org/stable/c/d4f9d5a99a3fd1b1c691b7a1a6f8f3f25f4116c9 |
