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signal/parisc: Use force_sig_mceerr where appropriate

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In do_page_fault where an mceerr is generated stop and call force_sig_mceerr.
Keeping the mcerr handling logic out of the force_sig_info call below.

This ensures that only and always in the mcerr case is lsb interesting.

This ensures setting set si_lsb in the future won't accidentally
stomp another siginfo field in the non mcerr case.

Cc: James Bottomley <jejb@parisc-linux.org>
Cc: Helge Deller <deller@gmx.de>
Cc: linux-parisc@vger.kernel.org
Acked-by: Helge Deller <deller@gmx.de>   # parisc
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2018-04-19 19:09:59 -05:00
parent 75bfb9a1c8
commit c2b0e0d33b
1 changed files with 15 additions and 15 deletions
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30
arch/parisc/mm/fault.c
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@ -354,7 +354,6 @@ bad_area:
if (user_mode(regs)) {
struct siginfo si;
unsigned int lsb = 0;
clear_siginfo(&si);
switch (code) {
@ -391,26 +390,27 @@ bad_area:
#ifdef CONFIG_MEMORY_FAILURE
if (fault & (VM_FAULT_HWPOISON|VM_FAULT_HWPOISON_LARGE)) {
unsigned int lsb = 0;
printk(KERN_ERR
"MCE: Killing %s:%d due to hardware memory corruption fault at %08lx\n",
tsk->comm, tsk->pid, address);
si.si_signo = SIGBUS;
si.si_code = BUS_MCEERR_AR;
/*
* Either small page or large page may be poisoned.
* In other words, VM_FAULT_HWPOISON_LARGE and
* VM_FAULT_HWPOISON are mutually exclusive.
*/
if (fault & VM_FAULT_HWPOISON_LARGE)
lsb = hstate_index_to_shift(VM_FAULT_GET_HINDEX(fault));
else if (fault & VM_FAULT_HWPOISON)
lsb = PAGE_SHIFT;
force_sig_mceerr(BUS_MCEERR_AR, (void __user *) address,
lsb, current);
return;
}
#endif
/*
* Either small page or large page may be poisoned.
* In other words, VM_FAULT_HWPOISON_LARGE and
* VM_FAULT_HWPOISON are mutually exclusive.
*/
if (fault & VM_FAULT_HWPOISON_LARGE)
lsb = hstate_index_to_shift(VM_FAULT_GET_HINDEX(fault));
else if (fault & VM_FAULT_HWPOISON)
lsb = PAGE_SHIFT;
else
show_signal_msg(regs, code, address, tsk, vma);
si.si_addr_lsb = lsb;
show_signal_msg(regs, code, address, tsk, vma);
si.si_errno = 0;
si.si_addr = (void __user *) address;