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a02527363a
strncpy() is deprecated for use on NUL-terminated destination strings [1] and as such we should prefer more robust and less ambiguous string interfaces. This patch eliminates three uses of strncpy(): Firstly, `dest` is expected to be NUL-terminated which is evident by the manual setting of a NUL-byte at size - 1. For this use specifically, strscpy() is a viable replacement due to the fact that it guarantees NUL-termination on the destination buffer. The next two cases should simply be memcpy() as the size of the src string is always 3 and the destination string just wants the first 3 bytes changed. To be clear, there are no buffer overread bugs in the current code as the sizes and offsets are carefully managed such that buffers are NUL-terminated. However, with these changes, the code is now more robust and less ambiguous (and hopefully easier to read). Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1] Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2] Link: https://github.com/KSPP/linux/issues/90 Signed-off-by: Justin Stitt <justinstitt@google.com> Reviewed-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20231012-strncpy-drivers-net-ethernet-qlogic-qed-qed_debug-c-v2-1-16d2c0162b80@google.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
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