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-rw-r--r--elf/dl-minimal.c38
1 files changed, 23 insertions, 15 deletions
diff --git a/elf/dl-minimal.c b/elf/dl-minimal.c
index adb85e6753..eeea790e40 100644
--- a/elf/dl-minimal.c
+++ b/elf/dl-minimal.c
@@ -1,5 +1,6 @@
/* Minimal replacements for basic facilities used in the dynamic linker.
- Copyright (C) 1995-1998,2000-2002,2004 Free Software Foundation, Inc.
+ Copyright (C) 1995-1998,2000-2002,2004-2006,2007
+ Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -74,14 +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;
@@ -107,7 +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. */
@@ -128,14 +143,13 @@ free (void *ptr)
void * weak_function
realloc (void *ptr, size_t n)
{
- void *new;
if (ptr == NULL)
return malloc (n);
assert (ptr == alloc_last_block);
+ size_t old_size = alloc_ptr - alloc_last_block;
alloc_ptr = alloc_last_block;
- new = malloc (n);
- assert (new == ptr);
- return new;
+ void *new = malloc (n);
+ return new != ptr ? memcpy (new, ptr, old_size) : new;
}
/* Avoid signal frobnication in setjmp/longjmp. Keeps things smaller. */
@@ -148,12 +162,6 @@ __sigjmp_save (sigjmp_buf env, int savemask __attribute__ ((unused)))
env[0].__mask_was_saved = 0;
return 0;
}
-
-void weak_function
-longjmp (jmp_buf env, int val)
-{
- __longjmp (env[0].__jmpbuf, val);
-}
/* Define our own version of the internal function used by strerror. We
only provide the messages for some common errors. This avoids pulling
@@ -270,7 +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;