Commit 96054569 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

x86: don't send SIGBUS for kernel page faults

It's wrong for several reasons, but the most direct one is that the
fault may be for the stack accesses to set up a previous SIGBUS.  When
we have a kernel exception, the kernel exception handler does all the
fixups, not some user-level signal handler.

Even apart from the nested SIGBUS issue, it's also wrong to give out
kernel fault addresses in the signal handler info block, or to send a
SIGBUS when a system call already returns EFAULT.
Signed-off-by: default avatarLinus Torvalds <>
parent 5528f913
......@@ -802,8 +802,10 @@ do_sigbus(struct pt_regs *regs, unsigned long error_code, unsigned long address,
/* Kernel mode? Handle exceptions or die: */
if (!(error_code & PF_USER))
if (!(error_code & PF_USER)) {
no_context(regs, error_code, address);
/* User-space => ok to do another page fault: */
if (is_prefetch(regs, error_code, 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