From d2ae5b5f6afd3c4caaf82444102a4372135cb994 Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Mon, 26 Jun 2006 13:57:56 +0200 Subject: [PATCH] x86_64: Get rid of pud_offset_k / __pud_offset_k pud_offset_k() equivalent to pud_offset() now. Pointed out by Jan Beulich Similar for __pud_offset_ok, which needs a small change in the callers. Signed-off-by: Andi Kleen Signed-off-by: Linus Torvalds --- arch/x86_64/mm/fault.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/x86_64/mm/fault.c') diff --git a/arch/x86_64/mm/fault.c b/arch/x86_64/mm/fault.c index 55250593d8c9..64728898f869 100644 --- a/arch/x86_64/mm/fault.c +++ b/arch/x86_64/mm/fault.c @@ -160,7 +160,7 @@ void dump_pagetable(unsigned long address) printk("PGD %lx ", pgd_val(*pgd)); if (!pgd_present(*pgd)) goto ret; - pud = __pud_offset_k((pud_t *)pgd_page(*pgd), address); + pud = pud_offset(pgd, address); if (bad_address(pud)) goto bad; printk("PUD %lx ", pud_val(*pud)); if (!pud_present(*pud)) goto ret; -- cgit v1.2.3 From 03fdc2c277afdbd217eccd1ce0cfeff77ebd8b77 Mon Sep 17 00:00:00 2001 From: Chuck Ebbert <76306.1226@compuserve.com> Date: Mon, 26 Jun 2006 13:59:50 +0200 Subject: [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 Signed-off-by: Linus Torvalds --- arch/x86_64/mm/fault.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'arch/x86_64/mm/fault.c') diff --git a/arch/x86_64/mm/fault.c b/arch/x86_64/mm/fault.c index 64728898f869..4968a71df4aa 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)) -- cgit v1.2.3