Ed Maste 33482dae89 libc: fix undefined behavior from signed overflow in strstr and memmem ... unsigned char promotes to int, which can overflow when shifted left by 24 bits or more. this has been reported multiple times but then forgotten. it's expected to be benign UB, but can trap when built with explicit overflow catching (ubsan or similar). fix it now. note that promotion to uint32_t is safe and portable even outside of the assumptions usually made in musl, since either uint32_t has rank at least unsigned int, so that no further default promotions happen, or int is wide enough that the shift can't overflow. this is a desirable property to have in case someone wants to reuse the code elsewhere. musl commit: 593caa456309714402ca4cb77c3770f4c24da9da Obtained from: musl		2020-11-19 00:03:15 +00:00
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bcmp.3
bcmp.c
bcopy.3
bcopy.c
bstring.3
bzero.3
bzero.c
ffs.3
ffs.c
ffsl.c
ffsll.c
fls.c
flsl.c
flsll.c
index.3
Makefile.inc
memccpy.3
memccpy.c
memchr.3
memchr.c	clang-format libc string functions imported from musl	2020-11-18 22:01:34 +00:00
memcmp.3
memcmp.c
memcpy.3
memcpy.c
memmem.3
memmem.c	libc: fix undefined behavior from signed overflow in strstr and memmem	2020-11-19 00:03:15 +00:00
memmove.3
memmove.c
memrchr.c
memset_s.c
memset.3	memset.3: better fix previous typo	2020-02-08 21:17:48 +00:00
memset.c
stpcpy.c
stpncpy.c
strcasecmp.3
strcasecmp.c
strcasestr.c
strcat.3
strcat.c
strchr.3
strchr.c
strchrnul.c
strcmp.3
strcmp.c
strcoll.3
strcoll.c
strcpy.3
strcpy.c	[PPC64] strcpy optimization	2020-01-15 19:46:01 +00:00
strcspn.c
strdup.3	strdup.3: Slightly canonicalize OOM return/error status	2020-05-05 17:57:04 +00:00
strdup.c
strerror.3
strerror.c
string.3
strlcat.c
strlcpy.3	libc manpages: various improvements from NetBSD	2020-06-14 05:59:30 +00:00
strlcpy.c
strlen.3
strlen.c
strmode.3
strmode.c
strncat.c
strncmp.c
strncpy.c	[PPC64] strncpy optimization	2020-01-15 19:53:03 +00:00
strndup.c
strnlen.c
strnstr.c
strpbrk.3
strpbrk.c
strrchr.c
strsep.3
strsep.c
strsignal.c
strspn.3
strspn.c
strstr.3
strstr.c	libc: fix undefined behavior from signed overflow in strstr and memmem	2020-11-19 00:03:15 +00:00
strtok.3	strtok(3): make it easier to find the RETURN VALUES section	2020-06-22 11:03:36 +00:00
strtok.c
strxfrm.3
strxfrm.c
swab.3
swab.c
Symbol.map
timingsafe_bcmp.3
timingsafe_bcmp.c
timingsafe_memcmp.c
wcpcpy.c
wcpncpy.c
wcscasecmp.c
wcscat.c
wcschr.c
wcscmp.c
wcscoll.3
wcscoll.c
wcscpy.c
wcscspn.c
wcsdup.c
wcslcat.c
wcslcpy.c
wcslen.c
wcsncasecmp.c
wcsncat.c
wcsncmp.c
wcsncpy.c
wcsnlen.c
wcspbrk.c
wcsrchr.c
wcsspn.c
wcsstr.c
wcstok.3
wcstok.c
wcswidth.3
wcswidth.c
wcsxfrm.3
wcsxfrm.c
wmemchr.3
wmemchr.c
wmemcmp.c
wmemcpy.c
wmemmove.c
wmemset.c