6.4-stable review patch. If anyone has any objections, please let me know.
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From: Yafang Shao laoar.shao@gmail.com
[ Upstream commit 5125e757e62f6c1d5478db4c2b61a744060ddf3f ]
To avoid returning uninitialized or random values when querying the file descriptor (fd) and accessing probe_addr, it is necessary to clear the variable prior to its use.
Fixes: 41bdc4b40ed6 ("bpf: introduce bpf subcommand BPF_TASK_FD_QUERY") Signed-off-by: Yafang Shao laoar.shao@gmail.com Acked-by: Yonghong Song yhs@fb.com Acked-by: Jiri Olsa jolsa@kernel.org Link: https://lore.kernel.org/r/20230709025630.3735-6-laoar.shao@gmail.com Signed-off-by: Alexei Starovoitov ast@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- include/linux/trace_events.h | 3 ++- kernel/trace/bpf_trace.c | 2 +- kernel/trace/trace_uprobe.c | 3 ++- 3 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h index c55fc453e33b5..6a41ad2ca84cc 100644 --- a/include/linux/trace_events.h +++ b/include/linux/trace_events.h @@ -875,7 +875,8 @@ extern int perf_uprobe_init(struct perf_event *event, extern void perf_uprobe_destroy(struct perf_event *event); extern int bpf_get_uprobe_info(const struct perf_event *event, u32 *fd_type, const char **filename, - u64 *probe_offset, bool perf_type_tracepoint); + u64 *probe_offset, u64 *probe_addr, + bool perf_type_tracepoint); #endif extern int ftrace_profile_set_filter(struct perf_event *event, int event_id, char *filter_str); diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index a53524f3f7d82..3d8d5c383dfe5 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -2391,7 +2391,7 @@ int bpf_get_perf_event_info(const struct perf_event *event, u32 *prog_id, #ifdef CONFIG_UPROBE_EVENTS if (flags & TRACE_EVENT_FL_UPROBE) err = bpf_get_uprobe_info(event, fd_type, buf, - probe_offset, + probe_offset, probe_addr, event->attr.type == PERF_TYPE_TRACEPOINT); #endif } diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c index 7b47e9a2c0102..9173fcfc03820 100644 --- a/kernel/trace/trace_uprobe.c +++ b/kernel/trace/trace_uprobe.c @@ -1416,7 +1416,7 @@ static void uretprobe_perf_func(struct trace_uprobe *tu, unsigned long func,
int bpf_get_uprobe_info(const struct perf_event *event, u32 *fd_type, const char **filename, u64 *probe_offset, - bool perf_type_tracepoint) + u64 *probe_addr, bool perf_type_tracepoint) { const char *pevent = trace_event_name(event->tp_event); const char *group = event->tp_event->class->system; @@ -1433,6 +1433,7 @@ int bpf_get_uprobe_info(const struct perf_event *event, u32 *fd_type, : BPF_FD_TYPE_UPROBE; *filename = tu->filename; *probe_offset = tu->offset; + *probe_addr = 0; return 0; } #endif /* CONFIG_PERF_EVENTS */