svn commit: branches/uClibc_0_9_29/libc/unistd
vapier at uclibc.org
vapier at uclibc.org
Tue Jan 8 06:44:36 UTC 2008
Author: vapier
Date: 2008-01-07 22:44:36 -0800 (Mon, 07 Jan 2008)
New Revision: 20814
Log:
fix memory corruption on no-mmu from doing multiple execls where earlier execls fail by simply not releasing the memory reserved for the arguments of children processes
Modified:
branches/uClibc_0_9_29/libc/unistd/exec.c
Changeset:
Modified: branches/uClibc_0_9_29/libc/unistd/exec.c
===================================================================
--- branches/uClibc_0_9_29/libc/unistd/exec.c 2008-01-08 06:44:19 UTC (rev 20813)
+++ branches/uClibc_0_9_29/libc/unistd/exec.c 2008-01-08 06:44:36 UTC (rev 20814)
@@ -63,19 +63,12 @@
# define EXEC_ALLOC_SIZE(VAR) size_t VAR; /* Semicolon included! */
# define EXEC_ALLOC(SIZE,VAR) __exec_alloc((VAR = (SIZE)))
-# define EXEC_FREE(PTR,VAR) __exec_free((PTR),(VAR))
+# define EXEC_FREE(PTR,VAR) ((void)0)
extern void *__exec_alloc(size_t size) attribute_hidden;
-extern void __exec_free(void *ptr, size_t size) attribute_hidden;
# ifdef L___exec_alloc
-void attribute_hidden __exec_free(void *ptr, size_t size)
-{
- if (ptr)
- munmap(ptr, size);
-}
-
void attribute_hidden *__exec_alloc(size_t size)
{
static void *p;
@@ -83,8 +76,8 @@
if (old_size >= size)
return p;
- else
- __exec_free(p, old_size);
+ else if (p)
+ munmap(p, old_size);
old_size = size;
p = mmap(0, size, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS, -1, 0);
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