Commit 03fdc2c2 authored by Chuck Ebbert's avatar Chuck Ebbert Committed by Linus Torvalds
Browse files

[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: default avatarChuck Ebbert <>
Signed-off-by: default avatarAndi Kleen <>
Signed-off-by: default avatarLinus Torvalds <>
parent 6bfa9bb5
......@@ -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))
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment