| 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-2024-36882: mm: use memalloc_nofs_save() in page_cache_ra_order() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| mm: use memalloc_nofs_save() in page_cache_ra_order() |
| |
| See commit f2c817bed58d ("mm: use memalloc_nofs_save in readahead path"), |
| ensure that page_cache_ra_order() do not attempt to reclaim file-backed |
| pages too, or it leads to a deadlock, found issue when test ext4 large |
| folio. |
| |
| INFO: task DataXceiver for:7494 blocked for more than 120 seconds. |
| "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. |
| task:DataXceiver for state:D stack:0 pid:7494 ppid:1 flags:0x00000200 |
| Call trace: |
| __switch_to+0x14c/0x240 |
| __schedule+0x82c/0xdd0 |
| schedule+0x58/0xf0 |
| io_schedule+0x24/0xa0 |
| __folio_lock+0x130/0x300 |
| migrate_pages_batch+0x378/0x918 |
| migrate_pages+0x350/0x700 |
| compact_zone+0x63c/0xb38 |
| compact_zone_order+0xc0/0x118 |
| try_to_compact_pages+0xb0/0x280 |
| __alloc_pages_direct_compact+0x98/0x248 |
| __alloc_pages+0x510/0x1110 |
| alloc_pages+0x9c/0x130 |
| folio_alloc+0x20/0x78 |
| filemap_alloc_folio+0x8c/0x1b0 |
| page_cache_ra_order+0x174/0x308 |
| ondemand_readahead+0x1c8/0x2b8 |
| page_cache_async_ra+0x68/0xb8 |
| filemap_readahead.isra.0+0x64/0xa8 |
| filemap_get_pages+0x3fc/0x5b0 |
| filemap_splice_read+0xf4/0x280 |
| ext4_file_splice_read+0x2c/0x48 [ext4] |
| vfs_splice_read.part.0+0xa8/0x118 |
| splice_direct_to_actor+0xbc/0x288 |
| do_splice_direct+0x9c/0x108 |
| do_sendfile+0x328/0x468 |
| __arm64_sys_sendfile64+0x8c/0x148 |
| invoke_syscall+0x4c/0x118 |
| el0_svc_common.constprop.0+0xc8/0xf0 |
| do_el0_svc+0x24/0x38 |
| el0_svc+0x4c/0x1f8 |
| el0t_64_sync_handler+0xc0/0xc8 |
| el0t_64_sync+0x188/0x190 |
| |
| The Linux kernel CVE team has assigned CVE-2024-36882 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.18 with commit 793917d997df2e432f3e9ac126e4482d68256d01 and fixed in 6.1.91 with commit 7629ef6dda1564098aadeef38e5fbd11ee8627c4 |
| Issue introduced in 5.18 with commit 793917d997df2e432f3e9ac126e4482d68256d01 and fixed in 6.6.31 with commit 468971c3f4b8187f25334503b68050a0e1370147 |
| Issue introduced in 5.18 with commit 793917d997df2e432f3e9ac126e4482d68256d01 and fixed in 6.8.10 with commit cf6a1d16c6df3c30b03f0c6a92a2ba7f86dffb45 |
| Issue introduced in 5.18 with commit 793917d997df2e432f3e9ac126e4482d68256d01 and fixed in 6.9 with commit 30153e4466647a17eebfced13eede5cbe4290e69 |
| |
| 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-2024-36882 |
| 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: |
| mm/readahead.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/7629ef6dda1564098aadeef38e5fbd11ee8627c4 |
| https://git.kernel.org/stable/c/468971c3f4b8187f25334503b68050a0e1370147 |
| https://git.kernel.org/stable/c/cf6a1d16c6df3c30b03f0c6a92a2ba7f86dffb45 |
| https://git.kernel.org/stable/c/30153e4466647a17eebfced13eede5cbe4290e69 |
