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rtla/timerlat: Add bounds check for softirq vector

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Add bounds checking when accessing the softirq_name array using the
vector value from kernel trace data. The vector field from the
osnoise:softirq_noise event is used directly as an array index without
validation, which could cause an out-of-bounds read if the kernel
provides an unexpected vector value.

The softirq_name array contains 10 elements corresponding to the
standard Linux softirq vectors. While the kernel should only provide
valid vector values in the range 0-9, defensive programming requires
validating untrusted input before using it as an array index. If an
out-of-range vector is encountered, display the word UNKNOWN instead
of attempting to read beyond the array bounds.

Signed-off-by: Wander Lairson Costa <wander@redhat.com>
Link: https://lore.kernel.org/r/20260309195040.1019085-9-wander@redhat.com
Signed-off-by: Tomas Glozar <tglozar@redhat.com>
This commit is contained in:
Wander Lairson Costa
2026-03-09 16:46:21 -03:00
committed by Tomas Glozar
parent f79720e25b
commit d6515424e8
1 changed files with 2 additions and 2 deletions
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4
tools/tracing/rtla/src/timerlat_aa.c
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@@ -417,8 +417,8 @@ static int timerlat_aa_softirq_handler(struct trace_seq *s, struct tep_record *r
taa_data->thread_softirq_sum += duration;
trace_seq_printf(taa_data->softirqs_seq, " %24s:%-3llu %.*s %9.2f us\n",
softirq_name[vector], vector,
24, spaces,
vector < ARRAY_SIZE(softirq_name) ? softirq_name[vector] : "UNKNOWN",
vector, 24, spaces,
ns_to_usf(duration));
return 0;
}