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authorUlrich Drepper <drepper@redhat.com>2007-07-04 18:06:39 +0000
committerUlrich Drepper <drepper@redhat.com>2007-07-04 18:06:39 +0000
commit1311e86e432fde7e3ea44eb33e8b8472f710dd61 (patch)
treee15c0dd38128a7454e4c48010b9d7b255f8d8e28 /elf/dl-minimal.c
parent57c9179cab174f606a05b0372600efedd3331b92 (diff)
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* elf/dl-sysdep.c (_dl_important_hwcaps): Add integer overflow check.
* elf/dl-minimal.c (__libc_memalign): Likewise. Handle malloc (0). Return NULL if mmap failed instead of asserting it does not. (calloc): Check for integer overflow. * elf/dl-minimal.c (__strtoul_internal): Fix parsing of numbers bigger than LONG_MAX / 10.
Diffstat (limited to 'elf/dl-minimal.c')
-rw-r--r--elf/dl-minimal.c22
1 files changed, 18 insertions, 4 deletions
diff --git a/elf/dl-minimal.c b/elf/dl-minimal.c
index 45524088e9..5079c449f6 100644
--- a/elf/dl-minimal.c
+++ b/elf/dl-minimal.c
@@ -75,14 +75,21 @@ __libc_memalign (size_t align, size_t n)
alloc_ptr = (void *) 0 + (((alloc_ptr - (void *) 0) + align - 1)
& ~(align - 1));
- if (alloc_ptr + n >= alloc_end)
+ if (alloc_ptr + n >= alloc_end || n >= -(uintptr_t) alloc_ptr)
{
/* Insufficient space left; allocate another page. */
caddr_t page;
size_t nup = (n + GLRO(dl_pagesize) - 1) & ~(GLRO(dl_pagesize) - 1);
+ if (__builtin_expect (nup == 0, 0))
+ {
+ if (n)
+ return NULL;
+ nup = GLRO(dl_pagesize);
+ }
page = __mmap (0, nup, PROT_READ|PROT_WRITE,
MAP_ANON|MAP_PRIVATE, _dl_zerofd, 0);
- assert (page != MAP_FAILED);
+ if (page == MAP_FAILED)
+ return NULL;
if (page != alloc_end)
alloc_ptr = page;
alloc_end = page + nup;
@@ -108,7 +115,14 @@ calloc (size_t nmemb, size_t size)
/* New memory from the trivial malloc above is always already cleared.
(We make sure that's true in the rare occasion it might not be,
by clearing memory in free, below.) */
- return malloc (nmemb * size);
+ size_t bytes = nmemb * size;
+
+#define HALF_SIZE_T (((size_t) 1) << (8 * sizeof (size_t) / 2))
+ if (__builtin_expect ((nmemb | size) >= HALF_SIZE_T, 0)
+ && size != 0 && bytes / size != nmemb)
+ return NULL;
+
+ return malloc (bytes);
}
/* This will rarely be called. */
@@ -264,7 +278,7 @@ __strtoul_internal (const char *nptr, char **endptr, int base, int group)
while (*nptr >= '0' && *nptr <= '9')
{
unsigned long int digval = *nptr - '0';
- if (result > LONG_MAX / 10
+ if (result > ULONG_MAX / 10
|| (result == ULONG_MAX / 10 && digval > ULONG_MAX % 10))
{
errno = ERANGE;