linux-kernel - [PATCH v2 0/3] x86/entry: A compat syscall bugfix and some test stuff

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Message-Id: <cover.1614104065.git.luto@kernel.org>
Date:   Tue, 23 Feb 2021 10:15:07 -0800
From:   Andy Lutomirski <luto@...nel.org>
To:     x86@...nel.org
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>
Subject: [PATCH v2 0/3] x86/entry: A compat syscall bugfix and some test stuff

The compat syscall argument fixup error path is wrong.  Fix it.

This also adds some sanity checks to the kernel that catch the bug
when running selftests.

Changes from v1:
 - The fix is actually correct this time, I hope

Andy Lutomirski (3):
  entry: Check that syscall entries and syscall exits match
  x86/entry: Fix entry/exit mismatch on failed fast 32-bit syscalls
  selftests/x86: Add a missing .note.GNU-stack section to thunks_32.S

 arch/x86/entry/common.c                 |  3 ++-
 include/linux/entry-common.h            | 11 +++++++++++
 include/linux/sched.h                   |  1 +
 init/init_task.c                        |  9 +++++++++
 kernel/entry/common.c                   | 25 ++++++++++++++++++++++++-
 tools/testing/selftests/x86/thunks_32.S |  2 ++
 6 files changed, 49 insertions(+), 2 deletions(-)

-- 
2.29.2