Patch "selftests/x86: Add test_vsyscall" has been added to the 4.14-stable tree

This is a note to let you know that I've just added the patch titled

selftests/x86: Add test_vsyscall

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:
selftests-x86-add-test_vsyscall.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 <[email protected]> know about it.

From: Andy Lutomirski <[email protected]>
Date: Thu, 11 Jan 2018 17:16:51 -0800
Subject: selftests/x86: Add test_vsyscall

From: Andy Lutomirski <[email protected]>

commit 352909b49ba0d74929b96af6dfbefc854ab6ebb5 upstream.

This tests that the vsyscall entries do what they're expected to do. It also confirms that attempts to read the vsyscall page behave as expected.

If changes are made to the vsyscall code or its memory map handling, running this test in all three of vsyscall=none, vsyscall=emulate, and vsyscall=native are helpful.

(Because it's easy, this also compares the vsyscall results to their
vDSO equivalents.)

Note to KAISER backporters: please test this under all three vsyscall modes. Also, in the emulate and native modes, make sure that test_vsyscall_64 agrees with the command line or config option as to which mode you're in. It's quite easy to mess up the kernel such that native mode accidentally emulates or vice versa.

Greg, etc: please backport this to all your Meltdown-patched kernels. It'll help make sure the patches didn't regress vsyscalls.

---
 tools/testing/selftests/x86/Makefile        |    2 
 tools/testing/selftests/x86/test_vsyscall.c |  500 ++++++++++++++++++++++++++++
 2 files changed, 501 insertions(+), 1 deletion(-)

@@ -7,7 +7,7 @@ include ../lib.mk
 
 TARGETS_C_BOTHBITS := single_step_syscall sysret_ss_attrs syscall_nt ptrace_syscall test_mremap_vdso \
 			check_initial_reg_state sigreturn ldt_gdt iopl mpx-mini-test ioperm \
-			protection_keys test_vdso
+			protection_keys test_vdso test_vsyscall
 TARGETS_C_32BIT_ONLY := entry_from_vm86 syscall_arg_fault test_syscall_vdso unwind_vdso \
 			test_FCMOV test_FCOMI test_FISTTP \
 			vdso_restorer

Patches currently in stable-queue which might be from [email protected] are

queue-4.14/x86-pti-fix-pcid-and-sanitize-defines.patch queue-4.14/x86-documentation-add-pti-description.patch queue-4.14/selftests-x86-add-test_vsyscall.patch queue-4.14/x86-pti-make-unpoison-of-pgd-for-trusted-boot-work-for-real.patch queue-4.14/x86-alternatives-fix-optimize_nops-checking.patch