diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/i386/mm/fault.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/arch/i386/mm/fault.c b/arch/i386/mm/fault.c index 7f0fcf219a26..f38085ff3c3d 100644 --- a/arch/i386/mm/fault.c +++ b/arch/i386/mm/fault.c | |||
| @@ -380,12 +380,12 @@ fastcall void __kprobes do_page_fault(struct pt_regs *regs, | |||
| 380 | goto bad_area; | 380 | goto bad_area; |
| 381 | if (error_code & 4) { | 381 | if (error_code & 4) { |
| 382 | /* | 382 | /* |
| 383 | * accessing the stack below %esp is always a bug. | 383 | * Accessing the stack below %esp is always a bug. |
| 384 | * The "+ 32" is there due to some instructions (like | 384 | * The large cushion allows instructions like enter |
| 385 | * pusha) doing post-decrement on the stack and that | 385 | * and pusha to work. ("enter $65535,$31" pushes |
| 386 | * doesn't show up until later.. | 386 | * 32 pointers and then decrements %esp by 65535.) |
| 387 | */ | 387 | */ |
| 388 | if (address + 32 < regs->esp) | 388 | if (address + 65536 + 32 * sizeof(unsigned long) < regs->esp) |
| 389 | goto bad_area; | 389 | goto bad_area; |
| 390 | } | 390 | } |
| 391 | if (expand_stack(vma, address)) | 391 | if (expand_stack(vma, address)) |