Messages in this thread Patch in this message | | | From | Li Huafei <> | Subject | [PATCH 4.19] tracing/kprobe: Fix kprobe_on_func_entry() modification | Date | Fri, 24 Sep 2021 10:54:48 +0800 |
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The commit 960434acef37 ("tracing/kprobe: Fix to support kretprobe events on unloaded modules") backport from v5.11, which modifies the return value of kprobe_on_func_entry(). However, there is no adaptation modification in create_trace_kprobe(), resulting in the exact opposite behavior. Now we need to return an error immediately only if kprobe_on_func_entry() returns -EINVAL.
Fixes: 960434acef37 ("tracing/kprobe: Fix to support kretprobe events on unloaded modules") Signed-off-by: Li Huafei <lihuafei1@huawei.com> --- kernel/trace/trace_kprobe.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index 61eff45653f5..36dfea29d5fa 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -836,8 +836,9 @@ static int create_trace_kprobe(int argc, char **argv) pr_info("Failed to parse either an address or a symbol.\n"); return ret; } + /* Defer the ENOENT case until register kprobe */ if (offset && is_return && - !kprobe_on_func_entry(NULL, symbol, offset)) { + kprobe_on_func_entry(NULL, symbol, offset) == -EINVAL) { pr_info("Given offset is not valid for return probe.\n"); return -EINVAL; } -- 2.17.1
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