Comments (2)
dvyukov
commented on May 5, 2024
At some point I saw lots of false positives in sctp interrupt handlers, which turned out to be related to jprobes. I fixed it with:
diff --git a/arch/x86/kernel/kprobes/core.c b/arch/x86/kernel/kprobes/core.c
index 7847e5c..9198c18 100644
--- a/arch/x86/kernel/kprobes/core.c
+++ b/arch/x86/kernel/kprobes/core.c
@@ -1080,6 +1080,8 @@ void jprobe_return(void)
{
struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
+ kasan_unpoison_shadow((char*)&kcb - 32, (char*)kcb->jprobe_saved_sp - (char*)&kcb + 64);
+
asm volatile (
#ifdef CONFIG_X86_64
" xchg %%rbx,%%rsp \n"
Later the false positives disappeared, so I dropped the change.
Probably we still need it something along these lines. Not sure about other stores to %rsp in arch/x86/kernel/kprobes/{core,opt}.c.
from kernel-sanitizers.
xairy
commented on May 5, 2024
This looks fixed by 9f7d416.
from kernel-sanitizers.
Related Issues (20)
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