This is a note to let you know that I've just added the patch titled
x86/pkeys/selftests: Fix pointer math
to the 4.16-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-pkeys-selftests-fix-pointer-math.patch
and it can be found in the queue-4.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Sun Jun 17 12:07:34 CEST 2018
From: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Date: Wed, 9 May 2018 10:13:52 -0700
Subject: x86/pkeys/selftests: Fix pointer math
From: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
[ Upstream commit 3d64f4ed15c3c53dba4c514bf59c334464dee373 ]
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@xxxxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Michael Ellermen <mpe@xxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Ram Pai <linuxram@xxxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Link: http://lkml.kernel.org/r/20180509171352.9BE09819@xxxxxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/x86/protection_keys.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
--- a/tools/testing/selftests/x86/protection_keys.c
+++ b/tools/testing/selftests/x86/protection_keys.c
@@ -303,13 +303,6 @@ 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)) {
@@ -317,6 +310,13 @@ 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());
Patches currently in stable-queue which might be from dave.hansen@xxxxxxxxxxxxxxx are
queue-4.16/x86-pkeys-selftests-factor-out-instruction-page.patch
queue-4.16/x86-pkeys-selftests-fix-pointer-math.patch
queue-4.16/x86-pkeys-selftests-adjust-the-self-test-to-fresh-distros-that-export-the-pkeys-abi.patch
queue-4.16/x86-pkeys-selftests-add-a-test-for-pkey-0.patch
queue-4.16/x86-pkeys-selftests-stop-using-assert.patch
queue-4.16/x86-pkeys-selftests-save-off-prot-for-allocations.patch
queue-4.16/x86-pkeys-selftests-remove-dead-debugging-code-fix-dprint_in_signal.patch
queue-4.16/x86-mpx-selftests-adjust-the-self-test-to-fresh-distros-that-export-the-mpx-abi.patch
queue-4.16/x86-pkeys-selftests-add-prot_exec-test.patch
queue-4.16/x86-pkeys-selftests-allow-faults-on-unknown-keys.patch
queue-4.16/x86-pkeys-selftests-give-better-unexpected-fault-error-messages.patch
queue-4.16/x86-pkeys-selftests-avoid-printf-in-signal-deadlocks.patch
queue-4.16/x86-pkeys-selftests-fix-pkey-exhaustion-test-off-by-one.patch
