| 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-2024-53097: mm: krealloc: Fix MTE false alarm in __do_krealloc |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| mm: krealloc: Fix MTE false alarm in __do_krealloc |
| |
| This patch addresses an issue introduced by commit 1a83a716ec233 ("mm: |
| krealloc: consider spare memory for __GFP_ZERO") which causes MTE |
| (Memory Tagging Extension) to falsely report a slab-out-of-bounds error. |
| |
| The problem occurs when zeroing out spare memory in __do_krealloc. The |
| original code only considered software-based KASAN and did not account |
| for MTE. It does not reset the KASAN tag before calling memset, leading |
| to a mismatch between the pointer tag and the memory tag, resulting |
| in a false positive. |
| |
| Example of the error: |
| ================================================================== |
| swapper/0: BUG: KASAN: slab-out-of-bounds in __memset+0x84/0x188 |
| swapper/0: Write at addr f4ffff8005f0fdf0 by task swapper/0/1 |
| swapper/0: Pointer tag: [f4], memory tag: [fe] |
| swapper/0: |
| swapper/0: CPU: 4 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.12. |
| swapper/0: Hardware name: MT6991(ENG) (DT) |
| swapper/0: Call trace: |
| swapper/0: dump_backtrace+0xfc/0x17c |
| swapper/0: show_stack+0x18/0x28 |
| swapper/0: dump_stack_lvl+0x40/0xa0 |
| swapper/0: print_report+0x1b8/0x71c |
| swapper/0: kasan_report+0xec/0x14c |
| swapper/0: __do_kernel_fault+0x60/0x29c |
| swapper/0: do_bad_area+0x30/0xdc |
| swapper/0: do_tag_check_fault+0x20/0x34 |
| swapper/0: do_mem_abort+0x58/0x104 |
| swapper/0: el1_abort+0x3c/0x5c |
| swapper/0: el1h_64_sync_handler+0x80/0xcc |
| swapper/0: el1h_64_sync+0x68/0x6c |
| swapper/0: __memset+0x84/0x188 |
| swapper/0: btf_populate_kfunc_set+0x280/0x3d8 |
| swapper/0: __register_btf_kfunc_id_set+0x43c/0x468 |
| swapper/0: register_btf_kfunc_id_set+0x48/0x60 |
| swapper/0: register_nf_nat_bpf+0x1c/0x40 |
| swapper/0: nf_nat_init+0xc0/0x128 |
| swapper/0: do_one_initcall+0x184/0x464 |
| swapper/0: do_initcall_level+0xdc/0x1b0 |
| swapper/0: do_initcalls+0x70/0xc0 |
| swapper/0: do_basic_setup+0x1c/0x28 |
| swapper/0: kernel_init_freeable+0x144/0x1b8 |
| swapper/0: kernel_init+0x20/0x1a8 |
| swapper/0: ret_from_fork+0x10/0x20 |
| ================================================================== |
| |
| The Linux kernel CVE team has assigned CVE-2024-53097 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.10.227 with commit a543785856249a5ba8c20468098601c0c33b1224 and fixed in 5.10.230 with commit d02492863023431c31f85d570f718433c22b9311 |
| Issue introduced in 5.15.168 with commit 44f79667fefd52945a44d2a57a2cd3c554d7f4e0 and fixed in 5.15.173 with commit d43f1430d47c22a0727c05b6f156ed25fecdfeb4 |
| Issue introduced in 6.1.113 with commit f8767d10bcbc2529540eb906906c0058e15cd918 and fixed in 6.1.118 with commit 486aeb5f1855c75dd810c25036134961bd2a6722 |
| Issue introduced in 6.6.55 with commit e3a9fc1520a6606c6121aca8d6679c6b93de7fd8 and fixed in 6.6.62 with commit 71548fada7ee0eb50cc6ccda82dff010c745f92c |
| Issue introduced in 6.11.3 with commit 3e9a65a38706866bf93e19f5b4936465188add10 and fixed in 6.11.9 with commit 3dfb40da84f26dd35dd9bbaf626a2424565b8406 |
| Issue introduced in 6.10.14 with commit 73388659ef0eea51747350530afdeadf8809ce9c |
| |
| 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-2024-53097 |
| 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/8ebee7565effdeae6085458f8f8463363120a871 |
| https://git.kernel.org/stable/c/d02492863023431c31f85d570f718433c22b9311 |
| https://git.kernel.org/stable/c/d43f1430d47c22a0727c05b6f156ed25fecdfeb4 |
| https://git.kernel.org/stable/c/486aeb5f1855c75dd810c25036134961bd2a6722 |
| https://git.kernel.org/stable/c/71548fada7ee0eb50cc6ccda82dff010c745f92c |
| https://git.kernel.org/stable/c/3dfb40da84f26dd35dd9bbaf626a2424565b8406 |
| https://git.kernel.org/stable/c/704573851b51808b45dae2d62059d1d8189138a2 |
