diff mbox series

[v2,bpf-next,05/11] bpf: Clear the probe_addr for uprobe

Message ID 20230608103523.102267-6-laoar.shao@gmail.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series bpf: Support ->fill_link_info for kprobe_multi and perf_event links | expand

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netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for bpf-next, async
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 23 this patch: 23
netdev/cc_maintainers warning 3 maintainers not CCed: mhiramat@kernel.org linux-trace-kernel@vger.kernel.org rostedt@goodmis.org
netdev/build_clang success Errors and warnings before: 8 this patch: 8
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netdev/check_selftest success No net selftest shell script
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Commit Message

Yafang Shao June 8, 2023, 10:35 a.m. UTC 
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>
Cc: Yonghong Song <yhs@fb.com>
---
 kernel/trace/bpf_trace.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 738efcf..0cabd2e 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -2372,10 +2372,12 @@  int bpf_get_perf_event_info(const struct perf_event *event, u32 *prog_id,
 						  event->attr.type == PERF_TYPE_TRACEPOINT);
 #endif
 #ifdef CONFIG_UPROBE_EVENTS
-		if (flags & TRACE_EVENT_FL_UPROBE)
+		if (flags & TRACE_EVENT_FL_UPROBE) {
 			err = bpf_get_uprobe_info(event, fd_type, buf,
 						  probe_offset,
 						  event->attr.type == PERF_TYPE_TRACEPOINT);
+			*probe_addr = 0x0;
+		}
 #endif
 	}