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Subject[PATCH 4.14 38/89] x86/mm/pkeys: Fix fill_sig_info_pkey
Date
4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Eric W. Biederman <ebiederm@xmission.com>

commit beacd6f7ed5e2915959442245b3b2480c2e37490 upstream.

SEGV_PKUERR is a signal specific si_code which happens to have the same
numeric value as several others: BUS_MCEERR_AR, ILL_ILLTRP, FPE_FLTOVF,
TRAP_HWBKPT, CLD_TRAPPED, POLL_ERR, SEGV_THREAD_ID, as such it is not safe
to just test the si_code the signal number must also be tested to prevent a
false positive in fill_sig_info_pkey.

This error was by inspection, and BUS_MCEERR_AR appears to be a real
candidate for confusion. So pass in si_signo and check for SIG_SEGV to
verify that it is actually a SEGV_PKUERR

Fixes: 019132ff3daf ("x86/mm/pkeys: Fill in pkey field in siginfo")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-arch@vger.kernel.org
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Link: https://lkml.kernel.org/r/20180112203135.4669-2-ebiederm@xmission.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
arch/x86/mm/fault.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -173,14 +173,15 @@ is_prefetch(struct pt_regs *regs, unsign
* 6. T1 : reaches here, sees vma_pkey(vma)=5, when we really
* faulted on a pte with its pkey=4.
*/
-static void fill_sig_info_pkey(int si_code, siginfo_t *info, u32 *pkey)
+static void fill_sig_info_pkey(int si_signo, int si_code, siginfo_t *info,
+ u32 *pkey)
{
/* This is effectively an #ifdef */
if (!boot_cpu_has(X86_FEATURE_OSPKE))
return;

/* Fault not from Protection Keys: nothing to do */
- if (si_code != SEGV_PKUERR)
+ if ((si_code != SEGV_PKUERR) || (si_signo != SIGSEGV))
return;
/*
* force_sig_info_fault() is called from a number of
@@ -219,7 +220,7 @@ force_sig_info_fault(int si_signo, int s
lsb = PAGE_SHIFT;
info.si_addr_lsb = lsb;

- fill_sig_info_pkey(si_code, &info, pkey);
+ fill_sig_info_pkey(si_signo, si_code, &info, pkey);

force_sig_info(si_signo, &info, tsk);
}

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