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Add a macro to align the length of the stack, not the pointer itself, since

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we always want the alignment to grow the length.
This commit is contained in:
christos 2012-01-25 18:26:26 +00:00
parent 83d4c4e701
commit 3628cdc41a
2 changed files with 5 additions and 4 deletions
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6
sys/kern/kern_exec.c
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@ -1,4 +1,4 @@
/* $NetBSD: kern_exec.c,v 1.334 2012/01/24 20:03:36 christos Exp $ */
/* $NetBSD: kern_exec.c,v 1.335 2012/01/25 18:26:26 christos Exp $ */
/*-
* Copyright (c) 2008 The NetBSD Foundation, Inc.
@ -59,7 +59,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: kern_exec.c,v 1.334 2012/01/24 20:03:36 christos Exp $");
__KERNEL_RCSID(0, "$NetBSD: kern_exec.c,v 1.335 2012/01/25 18:26:26 christos Exp $");
#include "opt_exec.h"
#include "opt_ktrace.h"
@ -793,7 +793,7 @@ execve1(struct lwp *l, const char *path, char * const *args,
#endif /* PAX_ASLR */
/* make the stack "safely" aligned */
len = (size_t)STACK_ALIGN(len, STACK_ALIGNBYTES);
len = STACK_LEN_ALIGN(len, STACK_ALIGNBYTES);
if (len > pack.ep_ssize) { /* in effect, compare to initial limit */
DPRINTF(("%s: stack limit exceeded %zu\n", __func__, len));

3
sys/sys/param.h
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@ -1,4 +1,4 @@
/* $NetBSD: param.h,v 1.400 2012/01/24 20:03:36 christos Exp $ */
/* $NetBSD: param.h,v 1.401 2012/01/25 18:26:26 christos Exp $ */
/*-
* Copyright (c) 1982, 1986, 1989, 1993
@ -224,6 +224,7 @@
#define STACK_ALLOC(sp, _size) (((char *)(void *)(sp)) - (_size))
#define STACK_MAX(p, _size) ((char *)(void *)(p))
#endif
#define STACK_LEN_ALIGN(len, bytes) ((len) + bytes) & ~bytes)
#endif /* defined(_KERNEL) || defined(__EXPOSE_STACK) */