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[PATCH] x86_64: enlarge window for stack growth 

Allow stack growth so the 'enter' instruction works.  Also
fixes problem in compat_sys_kexec_load() which could allocate
more than 128 bytes using compat_alloc_user_space().

Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Chuck Ebbert 2006-06-26 13:59:50 +02:00 committed by Linus Torvalds
parent 6bfa9bb519
commit 03fdc2c277
1 changed files with 4 additions and 2 deletions
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6
arch/x86_64/mm/fault.c
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@ -410,8 +410,10 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
if (!(vma->vm_flags & VM_GROWSDOWN))
goto bad_area;
if (error_code & 4) {
// XXX: align red zone size with ABI
if (address + 128 < regs->rsp)
/* Allow userspace just enough access below the stack pointer
* to let the 'enter' instruction work.
*/
if (address + 65536 + 32 * sizeof(unsigned long) < regs->rsp)
goto bad_area;
}
if (expand_stack(vma, address))