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[PATCHv8,bpf-next,02/13] bpf: Force uprobe bpf program to always return 0

Message ID 20241018204109.713820-3-jolsa@kernel.org (mailing list archive)
State Superseded
Headers show
Series bpf: Add uprobe session support | expand

Commit Message

Jiri Olsa Oct. 18, 2024, 8:40 p.m. UTC 
As suggested by Andrii make uprobe multi bpf programs to always return 0,
so they can't force uprobe removal.

Keeping the int return type for uprobe_prog_run, because it will be used
in following session changes.

Fixes: 89ae89f53d20 ("bpf: Add multi uprobe link")
Suggested-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 kernel/trace/bpf_trace.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)
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Patch

diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index fdab7ecd8dfa..3c1e5a561df4 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -3209,7 +3209,6 @@  static int uprobe_prog_run(struct bpf_uprobe *uprobe,
 	struct bpf_prog *prog = link->link.prog;
 	bool sleepable = prog->sleepable;
 	struct bpf_run_ctx *old_run_ctx;
-	int err = 0;
 
 	if (link->task && !same_thread_group(current, link->task))
 		return 0;
@@ -3222,7 +3221,7 @@  static int uprobe_prog_run(struct bpf_uprobe *uprobe,
 	migrate_disable();
 
 	old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
-	err = bpf_prog_run(link->link.prog, regs);
+	bpf_prog_run(link->link.prog, regs);
 	bpf_reset_run_ctx(old_run_ctx);
 
 	migrate_enable();
@@ -3231,7 +3230,7 @@  static int uprobe_prog_run(struct bpf_uprobe *uprobe,
 		rcu_read_unlock_trace();
 	else
 		rcu_read_unlock();
-	return err;
+	return 0;
 }
 
 static bool