kmsan: disable strscpy() optimization under KMSAN

Disable the efficient 8-byte reading under KMSAN to avoid false positives.

Alexander Potapenko committed 4 years ago

Commit 2de6f3b1 parent 8ed691b1 file · +8 −0Browse files

Showing the changes to lib/string.c (1 of 1 file). Show all

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@@ -197,6 +197,14 @@ ssize_t strscpy(char dest, const char src, size_t count) · 196 unmodified lines
197	max = 0;	197	max = 0;
198	#endif	198	#endif
199		199
		200	/*
		201	* read_word_at_a_time() below may read uninitialized bytes after the
		202	* trailing zero and use them in comparisons. Disable this optimization
		203	* under KMSAN to prevent false positive reports.
		204	*/
		205	if (IS_ENABLED(CONFIG_KMSAN))
		206	max = 0;
		207
200	while (max >= sizeof(unsigned long)) {	208	while (max >= sizeof(unsigned long)) {
201	unsigned long c, data;	209	unsigned long c, data;
202		210