linux-kernel - [PATCH 0/2] sigaltstack: return only one flag

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Message-Id: <20220126191441.3380389-1-stsp2@yandex.ru>
Date:   Wed, 26 Jan 2022 22:14:39 +0300
From:   Stas Sergeev <stsp2@...dex.ru>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Stas Sergeev <stsp2@...dex.ru>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Kees Cook <keescook@...omium.org>,
        Jens Axboe <axboe@...nel.dk>,
        Peter Zijlstra <peterz@...radead.org>,
        Marco Elver <elver@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Alexey Gladkov <legion@...nel.org>,
        Andrew Lutomirski <luto@....edu>,
        Shuah Khan <shuah@...nel.org>,
        "Chang S. Bae" <chang.seok.bae@...el.com>,
        Borislav Petkov <bp@...e.de>, Len Brown <len.brown@...el.com>,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] sigaltstack: return only one flag

Currently sigaltstack() can return multiple flags, for example
SS_DISABLE|SS_AUTODISARM. This confuses libraries (including asan
runtime) and contradicts the man page.

Patch 1 fixes this problem by ignoring any flag passed with SS_DISABLE.
Patch 2 adds a test-case for that scenario.

Signed-off-by: Stas Sergeev <stsp2@...dex.ru>
CC: "Eric W. Biederman" <ebiederm@...ssion.com>
CC: Kees Cook <keescook@...omium.org>
CC: Jens Axboe <axboe@...nel.dk>
CC: Peter Zijlstra <peterz@...radead.org>
CC: Marco Elver <elver@...gle.com>
CC: Thomas Gleixner <tglx@...utronix.de>
CC: Alexey Gladkov <legion@...nel.org>
CC: Andrew Lutomirski <luto@....edu>
CC: Shuah Khan <shuah@...nel.org>
CC: "Chang S. Bae" <chang.seok.bae@...el.com>
CC: Borislav Petkov <bp@...e.de>
CC: Thomas Gleixner <tglx@...utronix.de>
CC: Len Brown <len.brown@...el.com>
CC: linux-kselftest@...r.kernel.org
CC: linux-kernel@...r.kernel.org

Stas Sergeev (2):
  sigaltstack: ignore flags if SS_DISABLE is set
  selftests: sigaltstack: add new SS_DISABLE test

 kernel/signal.c                           |  1 +
 tools/testing/selftests/sigaltstack/sas.c | 48 ++++++++++++-----------
 2 files changed, 26 insertions(+), 23 deletions(-)

-- 
2.34.1