From: Oleg Nesterov <o...@redhat.com>
arch_check_bp_in_kernelspace() tries to avoid the overflow and does 2
TASK_SIZE checks but it needs OR, not AND. Consider va = TASK_SIZE -1
and len = 2 case.
Note: TASK_SIZE doesn't look right at least on x86, I think it should
be replaced by TASK_SIZE_MAX.
Signed-off-by: Oleg Nesterov <o...@redhat.com>
Fixes: 0067f1297241ea567f2b22a455519752d70fcca9
Cc: <stable@vger.kernel.org>
Signed-off-by: Frederic Weisbecker <fweis...@gmail.com>
---
arch/x86/kernel/hw_breakpoint.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kernel/hw_breakpoint.c b/arch/x86/kernel/hw_breakpoint.c
index f66ff16..1131c1f 100644
--- a/arch/x86/kernel/hw_breakpoint.c
+++ b/arch/x86/kernel/hw_breakpoint.c
@@ -200,7 +200,7 @@ int arch_check_bp_in_kernelspace(struct perf_event *bp)
va = info->address;
len = get_hbp_len(info->len);
- return (va >= TASK_SIZE) && ((va + len - 1) >= TASK_SIZE);
+ return (va >= TASK_SIZE) || ((va + len - 1) >= TASK_SIZE);
}
int arch_bp_generic_fields(int x86_len, int x86_type,
--
1.8.3.1
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