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Subject[PATCH 5/9] x86, pkeys, selftests: fix pointer math
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From: Dave Hansen <dave.hansen@linux.intel.com>

We dump out the entire area of the siginfo where the
si_pkey_ptr is supposed to be. But, we do some math
on the poitner, which is a u32. We intended to do
byte math, not u32 math on the pointer.

Cast it over to a u8* so it works.

Also, move this block of code to below th si_code
check. It doesn't hurt anything, but the si_pkey
field is gibberish for other signal types.

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Ram Pai <linuxram@us.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Michael Ellermen <mpe@ellerman.id.au>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Shuah Khan <shuah@kernel.org>
---

b/tools/testing/selftests/x86/protection_keys.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)

diff -puN tools/testing/selftests/x86/protection_keys.c~pkeys-selftests-fix-pointer-math tools/testing/selftests/x86/protection_keys.c
--- a/tools/testing/selftests/x86/protection_keys.c~pkeys-selftests-fix-pointer-math 2018-03-21 15:47:50.374198921 -0700
+++ b/tools/testing/selftests/x86/protection_keys.c 2018-03-21 15:47:50.377198921 -0700
@@ -289,13 +289,6 @@ void signal_handler(int signum, siginfo_
dump_mem(pkru_ptr - 128, 256);
pkey_assert(*pkru_ptr);

- si_pkey_ptr = (u32 *)(((u8 *)si) + si_pkey_offset);
- dprintf1("si_pkey_ptr: %p\n", si_pkey_ptr);
- dump_mem(si_pkey_ptr - 8, 24);
- siginfo_pkey = *si_pkey_ptr;
- pkey_assert(siginfo_pkey < NR_PKEYS);
- last_si_pkey = siginfo_pkey;
-
if ((si->si_code == SEGV_MAPERR) ||
(si->si_code == SEGV_ACCERR) ||
(si->si_code == SEGV_BNDERR)) {
@@ -303,6 +296,13 @@ void signal_handler(int signum, siginfo_
exit(4);
}

+ si_pkey_ptr = (u32 *)(((u8 *)si) + si_pkey_offset);
+ dprintf1("si_pkey_ptr: %p\n", si_pkey_ptr);
+ dump_mem((u8 *)si_pkey_ptr - 8, 24);
+ siginfo_pkey = *si_pkey_ptr;
+ pkey_assert(siginfo_pkey < NR_PKEYS);
+ last_si_pkey = siginfo_pkey;
+
dprintf1("signal pkru from xsave: %08x\n", *pkru_ptr);
/* need __rdpkru() version so we do not do shadow_pkru checking */
dprintf1("signal pkru from pkru: %08x\n", __rdpkru());
_
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