CVE-2023-52504
Description
In the Linux kernel, the following vulnerability has been resolved: x86/alternatives: Disable KASAN in apply_alternatives() Fei has reported that KASAN triggers during apply_alternatives() on a 5-level paging machine: BUG: KASAN: out-of-bounds in rcu_is_watching() Read of size 4 at addr ff110003ee6419a0 by task swapper/0/0 ... __asan_load4() rcu_is_watching() trace_hardirqs_on() text_poke_early() apply_alternatives() ... On machines with 5-level paging, cpu_feature_enabled(X86_FEATURE_LA57) gets patched. It includes KASAN code, where KASAN_SHADOW_START depends on __VIRTUAL_MASK_SHIFT, which is defined with cpu_feature_enabled(). KASAN gets confused when apply_alternatives() patches the KASAN_SHADOW_START users. A test patch that makes KASAN_SHADOW_START static, by replacing __VIRTUAL_MASK_SHIFT with 56, works around the issue. Fix it for real by disabling KASAN while the kernel is patching alternatives. [ mingo: updated the changelog ]
How to fix
- linux linux_kernel4.19.297, 5.4.270, 5.10.199, 5.15.136, 6.1.59, 6.5.8 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 4.17 ≤ v < 4.19.297, 4.20 ≤ v < 5.4.270, 5.5 ≤ v < 5.10.199, 5.11 ≤ v < 5.15.136, 5.16 ≤ v < 6.1.59, 6.2 ≤ v < 6.5.8, 6.6 | 4.19.297, 5.4.270, 5.10.199, 5.15.136, 6.1.59, 6.5.8 |
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