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fix(ebpf): relax MySQL split header length check #11794

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Merged
yinjiping merged 1 commit into from
Jun 12, 2026
Merged

fix(ebpf): relax MySQL split header length check #11794

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21 changes: 14 additions & 7 deletions agent/src/ebpf/kernel/include/protocol_inference.h
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Original file line number Diff line number Diff line change
Expand Up @@ -768,18 +768,25 @@ static __inline enum message_type infer_mysql_message(const char *buf,

if (conn_info->prev_count == 4) {
len = *(__u32 *) conn_info->prev_buf & 0x00ffffff;
if (len == count) {
seq = conn_info->prev_buf[3];
count += 4;
com = buf[0];
point_1 = buf[2];
point_2 = buf[4];
}
seq = conn_info->prev_buf[3];
count += 4;
com = buf[0];
point_1 = buf[2];
point_2 = buf[4];
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}

if (count < 5 || len == 0)
return MSG_UNKNOWN;

/*
* To prevent stale data from a previous map value remaining in
* the unused portion of `__infer_buf->data` when the current
* syscall provides fewer than 9 bytes of actual data.
*/
if (count < 9) {
point_1 = point_2 = 0;
}

bool is_mysqld = is_current_comm("mysqld");
if (is_socket_info_valid(conn_info->socket_info_ptr)) {
/*
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