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fix undefined behavior from signed overflow in strstr and memmem

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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.
This commit is contained in:
Rich Felker 2020-04-30 21:36:43 -04:00
parent 4486c579cb
commit 593caa4563
2 changed files with 8 additions and 8 deletions
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8
src/string/memmem.c
View File

@ -12,8 +12,8 @@ static char *twobyte_memmem(const unsigned char *h, size_t k, const unsigned cha
static char *threebyte_memmem(const unsigned char *h, size_t k, const unsigned char *n)
{
uint32_t nw = n[0]<<24 | n[1]<<16 | n[2]<<8;
uint32_t hw = h[0]<<24 | h[1]<<16 | h[2]<<8;
uint32_t nw = (uint32_t)n[0]<<24 | n[1]<<16 | n[2]<<8;
uint32_t hw = (uint32_t)h[0]<<24 | h[1]<<16 | h[2]<<8;
for (h+=3, k-=3; k; k--, hw = (hw|*h++)<<8)
if (hw == nw) return (char *)h-3;
return hw == nw ? (char *)h-3 : 0;
@ -21,8 +21,8 @@ static char *threebyte_memmem(const unsigned char *h, size_t k, const unsigned c
static char *fourbyte_memmem(const unsigned char *h, size_t k, const unsigned char *n)
{
uint32_t nw = n[0]<<24 | n[1]<<16 | n[2]<<8 | n[3];
uint32_t hw = h[0]<<24 | h[1]<<16 | h[2]<<8 | h[3];
uint32_t nw = (uint32_t)n[0]<<24 | n[1]<<16 | n[2]<<8 | n[3];
uint32_t hw = (uint32_t)h[0]<<24 | h[1]<<16 | h[2]<<8 | h[3];
for (h+=4, k-=4; k; k--, hw = hw<<8 | *h++)
if (hw == nw) return (char *)h-4;
return hw == nw ? (char *)h-4 : 0;

8
src/string/strstr.c
View File

@ -10,16 +10,16 @@ static char *twobyte_strstr(const unsigned char *h, const unsigned char *n)
static char *threebyte_strstr(const unsigned char *h, const unsigned char *n)
{
uint32_t nw = n[0]<<24 | n[1]<<16 | n[2]<<8;
uint32_t hw = h[0]<<24 | h[1]<<16 | h[2]<<8;
uint32_t nw = (uint32_t)n[0]<<24 | n[1]<<16 | n[2]<<8;
uint32_t hw = (uint32_t)h[0]<<24 | h[1]<<16 | h[2]<<8;
for (h+=2; *h && hw != nw; hw = (hw|*++h)<<8);
return *h ? (char *)h-2 : 0;
}
static char *fourbyte_strstr(const unsigned char *h, const unsigned char *n)
{
uint32_t nw = n[0]<<24 | n[1]<<16 | n[2]<<8 | n[3];
uint32_t hw = h[0]<<24 | h[1]<<16 | h[2]<<8 | h[3];
uint32_t nw = (uint32_t)n[0]<<24 | n[1]<<16 | n[2]<<8 | n[3];
uint32_t hw = (uint32_t)h[0]<<24 | h[1]<<16 | h[2]<<8 | h[3];
for (h+=3; *h && hw != nw; hw = hw<<8 | *++h);
return *h ? (char *)h-3 : 0;
}