This is a note to let you know that I've just added the patch titled
x86/pkeys/selftests: Allow faults on unknown keys
to the 4.14-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-allow-faults-on-unknown-keys.patch
and it can be found in the queue-4.14 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 12:13:49 CEST 2018
From: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Date: Wed, 9 May 2018 10:13:46 -0700
Subject: x86/pkeys/selftests: Allow faults on unknown keys
From: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
[ Upstream commit 7e7fd67ca39335a49619729821efb7cbdd674eb0 ]
The exec-only pkey is allocated inside the kernel and userspace
is not told what it is. So, allow PK faults to occur that have
an unknown key.
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/20180509171345.7FC7DA00@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 | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
--- a/tools/testing/selftests/x86/protection_keys.c
+++ b/tools/testing/selftests/x86/protection_keys.c
@@ -921,13 +921,21 @@ void *malloc_pkey(long size, int prot, u
}
int last_pkru_faults;
+#define UNKNOWN_PKEY -2
void expected_pk_fault(int pkey)
{
dprintf2("%s(): last_pkru_faults: %d pkru_faults: %d\n",
__func__, last_pkru_faults, pkru_faults);
dprintf2("%s(%d): last_si_pkey: %d\n", __func__, pkey, last_si_pkey);
pkey_assert(last_pkru_faults + 1 == pkru_faults);
- pkey_assert(last_si_pkey == pkey);
+
+ /*
+ * For exec-only memory, we do not know the pkey in
+ * advance, so skip this check.
+ */
+ if (pkey != UNKNOWN_PKEY)
+ pkey_assert(last_si_pkey == pkey);
+
/*
* The signal handler shold have cleared out PKRU to let the
* test program continue. We now have to restore it.
Patches currently in stable-queue which might be from dave.hansen@xxxxxxxxxxxxxxx are
queue-4.14/x86-pkeys-selftests-factor-out-instruction-page.patch
queue-4.14/x86-pkeys-selftests-fix-pointer-math.patch
queue-4.14/x86-pkeys-selftests-adjust-the-self-test-to-fresh-distros-that-export-the-pkeys-abi.patch
queue-4.14/x86-pkeys-selftests-add-a-test-for-pkey-0.patch
queue-4.14/x86-pkeys-selftests-stop-using-assert.patch
queue-4.14/x86-pkeys-selftests-save-off-prot-for-allocations.patch
queue-4.14/x86-pkeys-selftests-remove-dead-debugging-code-fix-dprint_in_signal.patch
queue-4.14/x86-mpx-selftests-adjust-the-self-test-to-fresh-distros-that-export-the-mpx-abi.patch
queue-4.14/x86-pkeys-selftests-add-prot_exec-test.patch
queue-4.14/x86-pkeys-selftests-allow-faults-on-unknown-keys.patch
queue-4.14/x86-pkeys-selftests-give-better-unexpected-fault-error-messages.patch
queue-4.14/x86-pkeys-selftests-fix-pkey-exhaustion-test-off-by-one.patch
