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bpf: Force uprobe bpf program to always return 0

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[ Upstream commit f505005bc7 ]

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: 89ae89f53d ("bpf: Add multi uprobe link")
Suggested-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20241108134544.480660-3-jolsa@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jiri Olsa
2024-11-08 14:45:33 +01:00
committed by Greg Kroah-Hartman
parent 38e3d796f6
commit 89bf1b665b
1 changed files with 2 additions and 3 deletions
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5
kernel/trace/bpf_trace.c
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@@ -3098,7 +3098,6 @@ static int uprobe_prog_run(struct bpf_uprobe *uprobe,
struct bpf_prog *prog = link->link.prog;
bool sleepable = prog->aux->sleepable;
struct bpf_run_ctx *old_run_ctx;
int err = 0;
if (link->task && current->mm != link->task->mm)
return 0;
@@ -3111,7 +3110,7 @@ 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();
@@ -3120,7 +3119,7 @@ static int uprobe_prog_run(struct bpf_uprobe *uprobe,
rcu_read_unlock_trace();
else
rcu_read_unlock();
return err;
return 0;
}
static bool