[Bug 288321] memrchr function can be very slow
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Date: Sat, 19 Jul 2025 13:04:52 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=288321
Lewis Donzis <lew@perftech.com> changed:
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CC| |lew@perftech.com
--- Comment #3 from Lewis Donzis <lew@perftech.com> ---
(In reply to Konstantin Belousov from comment #1)
I don't think it's legitimate for the length to exceed the length of the
buffer. It may work in some implementations (including the optimized amd64
variant) but it would be poor practice to depend on that. Our own
non-optimized C implementation (/usr/src/lib/libc/string/memrchr.c) searches
backwards from the specified length and, in your example, would likely crash
or, perhaps worse, provide an incorrect result, potentially far beyond the end
of the buffer.
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