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powerpc: Add VM_FAULT_HWPOISON handling to powerpc page fault handler

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do_page_fault was missing knowledge of HWPOISON, and we would oops
if userspace tried to access a poisoned page:

kernel BUG at arch/powerpc/mm/fault.c:180!

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Anton Blanchard 2014-09-24 16:59:57 +10:00 committed by Michael Ellerman
parent 63af52629a
commit 3913fdd7a2
1 changed files with 11 additions and 6 deletions
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17
arch/powerpc/mm/fault.c
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@ -114,7 +114,8 @@ static int store_updates_sp(struct pt_regs *regs)
#define MM_FAULT_CONTINUE -1
#define MM_FAULT_ERR(sig) (sig)
static int do_sigbus(struct pt_regs *regs, unsigned long address)
static int do_sigbus(struct pt_regs *regs, unsigned long address,
unsigned int fault)
{
siginfo_t info;
@ -128,6 +129,13 @@ static int do_sigbus(struct pt_regs *regs, unsigned long address)
info.si_errno = 0;
info.si_code = BUS_ADRERR;
info.si_addr = (void __user *)address;
#ifdef CONFIG_MEMORY_FAILURE
if (fault & (VM_FAULT_HWPOISON|VM_FAULT_HWPOISON_LARGE)) {
pr_err("MCE: Killing %s:%d due to hardware memory corruption fault at %lx\n",
current->comm, current->pid, address);
info.si_code = BUS_MCEERR_AR;
}
#endif
force_sig_info(SIGBUS, &info, current);
return MM_FAULT_RETURN;
}
@ -170,11 +178,8 @@ static int mm_fault_error(struct pt_regs *regs, unsigned long addr, int fault)
return MM_FAULT_RETURN;
}
/* Bus error. x86 handles HWPOISON here, we'll add this if/when
* we support the feature in HW
*/
if (fault & VM_FAULT_SIGBUS)
return do_sigbus(regs, addr);
if (fault & (VM_FAULT_SIGBUS|VM_FAULT_HWPOISON|VM_FAULT_HWPOISON_LARGE))
return do_sigbus(regs, addr, fault);
/* We don't understand the fault code, this is fatal */
BUG();