Résumé

mm: krealloc: Fix MTE false alarm in __do_krealloc

Description d'origine

La description telle que publiée par la source (souvent en anglais).

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: __m…

Source: OSV.dev (Open Source Vulnerabilities) NVD OSV

Paquets affectés

Linux Kernel

[{"type":"ECOSYSTEM","events":[{"introduced":"5.10.227"},{"fixed":"5.10.230"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.15.168"},{"fixed":"5.15.173"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.1.113"},{"fixed":"6.1.118"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.6.55"},{"fixed":"6.6.62"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.11.3"},{"fixed":"6.11.9"}]}]

État des correctifs par distribution

Paquets corrigés publiés par chaque distribution pour cette CVE

Debian DEBIAN-CVE-2024-53097 linux Corrigé dans: 5.10.234-1
Ubuntu UBUNTU-CVE-2024-53097 linux-hwe-edge