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: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index f627779..4c4508e 100644 (file)
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -802,8 +802,10 @@ do_sigbus(struct pt_regs *regs, unsigned long error_code, unsigned long address,
        up_read(&mm->mmap_sem);
 
        /* Kernel mode? Handle exceptions or die: */
-       if (!(error_code & PF_USER))
+       if (!(error_code & PF_USER)) {
                no_context(regs, error_code, address);
+               return;
+       }
 
        /* User-space => ok to do another page fault: */
        if (is_prefetch(regs, error_code, address))