diff options
| author | Chuck Ebbert <76306.1226@compuserve.com> | 2006-06-26 13:59:50 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-26 10:48:22 -0700 |
| commit | 03fdc2c277afdbd217eccd1ce0cfeff77ebd8b77 (patch) | |
| tree | e7264520754eed7b71296c839dff36d9270ee516 /arch | |
| parent | 6bfa9bb5195c68f75bd3937e4d77cb0bfe852d0d (diff) | |
[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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86_64/mm/fault.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/x86_64/mm/fault.c b/arch/x86_64/mm/fault.c index 64728898f86..4968a71df4a 100644 --- a/arch/x86_64/mm/fault.c +++ b/arch/x86_64/mm/fault.c @@ -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)) |