| 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-2024-53065: mm/slab: fix warning caused by duplicate kmem_cache creation in kmem_buckets_create |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| mm/slab: fix warning caused by duplicate kmem_cache creation in kmem_buckets_create |
| |
| Commit b035f5a6d852 ("mm: slab: reduce the kmalloc() minimum alignment |
| if DMA bouncing possible") reduced ARCH_KMALLOC_MINALIGN to 8 on arm64. |
| However, with KASAN_HW_TAGS enabled, arch_slab_minalign() becomes 16. |
| This causes kmalloc_caches[*][8] to be aliased to kmalloc_caches[*][16], |
| resulting in kmem_buckets_create() attempting to create a kmem_cache for |
| size 16 twice. This duplication triggers warnings on boot: |
| |
| [ 2.325108] ------------[ cut here ]------------ |
| [ 2.325135] kmem_cache of name 'memdup_user-16' already exists |
| [ 2.325783] WARNING: CPU: 0 PID: 1 at mm/slab_common.c:107 __kmem_cache_create_args+0xb8/0x3b0 |
| [ 2.327957] Modules linked in: |
| [ 2.328550] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.12.0-rc5mm-unstable-arm64+ #12 |
| [ 2.328683] Hardware name: QEMU QEMU Virtual Machine, BIOS 2024.02-2 03/11/2024 |
| [ 2.328790] pstate: 61000009 (nZCv daif -PAN -UAO -TCO +DIT -SSBS BTYPE=--) |
| [ 2.328911] pc : __kmem_cache_create_args+0xb8/0x3b0 |
| [ 2.328930] lr : __kmem_cache_create_args+0xb8/0x3b0 |
| [ 2.328942] sp : ffff800083d6fc50 |
| [ 2.328961] x29: ffff800083d6fc50 x28: f2ff0000c1674410 x27: ffff8000820b0598 |
| [ 2.329061] x26: 000000007fffffff x25: 0000000000000010 x24: 0000000000002000 |
| [ 2.329101] x23: ffff800083d6fce8 x22: ffff8000832222e8 x21: ffff800083222388 |
| [ 2.329118] x20: f2ff0000c1674410 x19: f5ff0000c16364c0 x18: ffff800083d80030 |
| [ 2.329135] x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 |
| [ 2.329152] x14: 0000000000000000 x13: 0a73747369786520 x12: 79646165726c6120 |
| [ 2.329169] x11: 656820747563205b x10: 2d2d2d2d2d2d2d2d x9 : 0000000000000000 |
| [ 2.329194] x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000 |
| [ 2.329210] x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000000 |
| [ 2.329226] x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000 |
| [ 2.329291] Call trace: |
| [ 2.329407] __kmem_cache_create_args+0xb8/0x3b0 |
| [ 2.329499] kmem_buckets_create+0xfc/0x320 |
| [ 2.329526] init_user_buckets+0x34/0x78 |
| [ 2.329540] do_one_initcall+0x64/0x3c8 |
| [ 2.329550] kernel_init_freeable+0x26c/0x578 |
| [ 2.329562] kernel_init+0x3c/0x258 |
| [ 2.329574] ret_from_fork+0x10/0x20 |
| [ 2.329698] ---[ end trace 0000000000000000 ]--- |
| |
| [ 2.403704] ------------[ cut here ]------------ |
| [ 2.404716] kmem_cache of name 'msg_msg-16' already exists |
| [ 2.404801] WARNING: CPU: 2 PID: 1 at mm/slab_common.c:107 __kmem_cache_create_args+0xb8/0x3b0 |
| [ 2.404842] Modules linked in: |
| [ 2.404971] CPU: 2 UID: 0 PID: 1 Comm: swapper/0 Tainted: G W 6.12.0-rc5mm-unstable-arm64+ #12 |
| [ 2.405026] Tainted: [W]=WARN |
| [ 2.405043] Hardware name: QEMU QEMU Virtual Machine, BIOS 2024.02-2 03/11/2024 |
| [ 2.405057] pstate: 60400009 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) |
| [ 2.405079] pc : __kmem_cache_create_args+0xb8/0x3b0 |
| [ 2.405100] lr : __kmem_cache_create_args+0xb8/0x3b0 |
| [ 2.405111] sp : ffff800083d6fc50 |
| [ 2.405115] x29: ffff800083d6fc50 x28: fbff0000c1674410 x27: ffff8000820b0598 |
| [ 2.405135] x26: 000000000000ffd0 x25: 0000000000000010 x24: 0000000000006000 |
| [ 2.405153] x23: ffff800083d6fce8 x22: ffff8000832222e8 x21: ffff800083222388 |
| [ 2.405169] x20: fbff0000c1674410 x19: fdff0000c163d6c0 x18: ffff800083d80030 |
| [ 2.405185] x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 |
| [ 2.405201] x14: 0000000000000000 x13: 0a73747369786520 x12: 79646165726c6120 |
| [ 2.405217] x11: 656820747563205b x10: 2d2d2d2d2d2d2d2d x9 : 0000000000000000 |
| [ 2.405233] x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000 |
| [ 2.405248] x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000000 |
| [ 2.405271] x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000 |
| [ 2.405287] Call trace: |
| [ 2.405293] __kmem_cache_create_args+0xb8/0x3b0 |
| [ 2.405305] kmem_buckets_create+0xfc/0x320 |
| [ 2.405315] init_msg_buckets+0x34/0x78 |
| [ 2.405326] do_one_initcall+0x64/0x3c8 |
| [ 2.405337] kernel_init_freeable+0x26c/0x578 |
| [ 2.405348] kernel_init+0x3c/0x258 |
| [ 2.405360] ret_from_fork+0x10/0x20 |
| [ 2.405370] ---[ end trace 0000000000000000 ]--- |
| |
| To address this, alias kmem_cache for sizes smaller than min alignment |
| to the aligned sized kmem_cache, as done with the default system kmalloc |
| bucket. |
| |
| The Linux kernel CVE team has assigned CVE-2024-53065 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.11 with commit b32801d1255be1da62ea8134df3ed9f3331fba12 and fixed in 6.11.8 with commit 1b47f9febf48641d3530ec877f4d0995c58e6b73 |
| Issue introduced in 6.11 with commit b32801d1255be1da62ea8134df3ed9f3331fba12 and fixed in 6.12 with commit 9c9201afebea1efc7ea4b8f721ee18a05bb8aca1 |
| |
| 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-2024-53065 |
| 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/slab_common.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/1b47f9febf48641d3530ec877f4d0995c58e6b73 |
| https://git.kernel.org/stable/c/9c9201afebea1efc7ea4b8f721ee18a05bb8aca1 |
