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tracing: Use memset_startat() to zero struct trace_iterator

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In preparation for FORTIFY_SOURCE performing compile-time and run-time
field bounds checking for memset(), avoid intentionally writing across
neighboring fields.

Use memset_startat() to avoid confusing memset() about writing beyond
the target struct member.

Link: https://lkml.kernel.org/r/20211118202217.1285588-1-keescook@chromium.org

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Kees Cook 2021-11-18 12:22:17 -08:00 committed by Steven Rostedt (VMware)
parent f86b0aaad7
commit c4c1dbcc09
1 changed files with 1 additions and 3 deletions
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4
kernel/trace/trace.c
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@ -6706,9 +6706,7 @@ waitagain:
cnt = PAGE_SIZE - 1;
/* reset all but tr, trace, and overruns */
memset(&iter->seq, 0,
sizeof(struct trace_iterator) -
offsetof(struct trace_iterator, seq));
memset_startat(iter, 0, seq);
cpumask_clear(iter->started);
trace_seq_init(&iter->seq);
iter->pos = -1;