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| author | Chen Zhongjin <chenzhongjin@huawei.com> | 2022-08-01 11:37:19 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2022-08-02 11:47:29 +0200 |
| commit | 28f6c37a2910f565b4f5960df52b2eccae28c891 (patch) | |
| tree | 5d8aea752d27e43075fb186acf1651cfa18d7c9f /kernel/kprobes.c | |
| parent | 9de1f9c8ca5100a02a2e271bdbde36202e251b4b (diff) | |
| download | linux-28f6c37a2910f565b4f5960df52b2eccae28c891.tar.bz2 | |
kprobes: Forbid probing on trampoline and BPF code areas
kernel_text_address() treats ftrace_trampoline, kprobe_insn_slot
and bpf_text_address as valid kprobe addresses - which is not ideal.
These text areas are removable and changeable without any notification
to kprobes, and probing on them can trigger unexpected behavior:
https://lkml.org/lkml/2022/7/26/1148
Considering that jump_label and static_call text are already
forbiden to probe, kernel_text_address() should be replaced with
core_kernel_text() and is_module_text_address() to check other text
areas which are unsafe to kprobe.
[ mingo: Rewrote the changelog. ]
Fixes: 5b485629ba0d ("kprobes, extable: Identify kprobes trampolines as kernel text area")
Fixes: 74451e66d516 ("bpf: make jited programs visible in traces")
Signed-off-by: Chen Zhongjin <chenzhongjin@huawei.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Link: https://lore.kernel.org/r/20220801033719.228248-1-chenzhongjin@huawei.com
Diffstat (limited to 'kernel/kprobes.c')
| -rw-r--r-- | kernel/kprobes.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/kprobes.c b/kernel/kprobes.c index f214f8c088ed..80697e5e03e4 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -1560,7 +1560,8 @@ static int check_kprobe_address_safe(struct kprobe *p, preempt_disable(); /* Ensure it is not in reserved area nor out of text */ - if (!kernel_text_address((unsigned long) p->addr) || + if (!(core_kernel_text((unsigned long) p->addr) || + is_module_text_address((unsigned long) p->addr)) || within_kprobe_blacklist((unsigned long) p->addr) || jump_label_text_reserved(p->addr, p->addr) || static_call_text_reserved(p->addr, p->addr) || |