摘要:

In the Linux kernel, the following vulnerability has been resolved:ASoC: dapm: Fix UAF for snd_soc_pcm_runtime objectWhen using kernel with the following extra config, - CONFIG_KASAN=y - CONFIG_KASAN_GENERIC=y - CONFIG_KASAN_INLINE=y - CONFIG_KASAN_VMALLOC=y - CONFIG_FRAME_WARN=4096kernel detects that snd_pcm_suspend_all() access a freed snd_soc_pcm_runtime object when the system is suspended, whichleads to a use-after-free bug:[ 52.047746] BUG: KASAN: use-after-free in snd_pcm_suspend_all+0x1a8/0x270[ 52.047765] Read of size 1 at addr ffff0000b9434d50 by task systemd-sleep/2330[ 52.047785] Call trace:[ 52.047787] dump_backtrace+0x0/0x3c0[ 52.047794] show_stack+0x34/0x50[ 52.047797] dump_stack_lvl+0x68/0x8c[ 52.047802] print_address_description.constprop.0+0x74/0x2c0[ 52.047809] kasan_report+0x210/0x230[ 52.047815] __asan_report_load1_noabort+0x3c/0x50[ 52.047820] snd_pcm_suspend_all+0x1a8/0x270[ 52.047824] snd_soc_suspend+0x19c/0x4e0The snd_pcm_sync_stop() has a NULL check on substream->runtime beforemaking any access. So we need to always set substream->runtime to NULLeverytime we kfree() it.

安全等级: Low

公告ID: KylinSec-SA-2024-3910

发布日期: 2024年10月12日

关联CVE: CVE-2024-46798