From 0ec364c0c95fc85bcbc88f1a9a06ebe83c88e18c Mon Sep 17 00:00:00 2001 From: Yang Shi Date: Tue, 4 Nov 2025 13:49:47 -0800 Subject: [PATCH] arm64: kprobes: check the return value of set_memory_rox() Since commit a166563e7ec3 ("arm64: mm: support large block mapping when rodata=full"), __change_memory_common has more chance to fail due to memory allocation failure when splitting page table. So check the return value of set_memory_rox(), then bail out if it fails otherwise we may have RW memory mapping for kprobes insn page. Fixes: 195a1b7d8388 ("arm64: kprobes: call set_memory_rox() for kprobe page") Reviewed-by: Ryan Roberts Reviewed-by: Dev Jain Signed-off-by: Yang Shi Signed-off-by: Will Deacon --- arch/arm64/kernel/probes/kprobes.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kernel/probes/kprobes.c b/arch/arm64/kernel/probes/kprobes.c index 8ab6104a4883..43a0361a8bf0 100644 --- a/arch/arm64/kernel/probes/kprobes.c +++ b/arch/arm64/kernel/probes/kprobes.c @@ -49,7 +49,10 @@ void *alloc_insn_page(void) addr = execmem_alloc(EXECMEM_KPROBES, PAGE_SIZE); if (!addr) return NULL; - set_memory_rox((unsigned long)addr, 1); + if (set_memory_rox((unsigned long)addr, 1)) { + execmem_free(addr); + return NULL; + } return addr; } -- 2.47.3