From: Will Deacon <will.deacon@arm.com> To: linux-kernel@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, arnd@arndb.de, linux@dominikbrodowski.net, ebiederm@xmission.com, akpm@linux-foundation.org, viro@zeniv.linux.org.uk, oleg@redhat.com, steve.mcintyre@arm.com, dave.martin@arm.com, Will Deacon <will.deacon@arm.com> Subject: [PATCH 0/2] Don't use SIGMINSTKSZ when enforcing alternative signal stack size for compat tasks Date: Wed, 25 Jul 2018 14:45:10 +0100 [thread overview] Message-ID: <1532526312-26993-1-git-send-email-will.deacon@arm.com> (raw) Hi all, The Debian folks have observed a failure in the 32-bit arm glibc testsuite when running under a 64-bit kernel. They tracked this down to sigaltstack(2) enforcing the alternative signal stack to be at least SIGMINSTKSZ bytes, which is higher for native arm64 tasks than compat 32-bit tasks. These patches resolve the issue by allowing an architecture to define COMPAT_SIGMINSTKSZ for compat tasks, which is then used by the sigaltstack checking code. Feedback welcome, Will --->8 Will Deacon (2): signal: Introduce COMPAT_SIGMINSTKSZ for use in compat_sys_sigaltstack arm64: compat: Provide definition for COMPAT_SIGMINSTKSZ arch/arm64/include/asm/compat.h | 1 + include/linux/compat.h | 3 +++ kernel/signal.c | 14 +++++++++----- 3 files changed, 13 insertions(+), 5 deletions(-) -- 2.1.4
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From: will.deacon@arm.com (Will Deacon) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 0/2] Don't use SIGMINSTKSZ when enforcing alternative signal stack size for compat tasks Date: Wed, 25 Jul 2018 14:45:10 +0100 [thread overview] Message-ID: <1532526312-26993-1-git-send-email-will.deacon@arm.com> (raw) Hi all, The Debian folks have observed a failure in the 32-bit arm glibc testsuite when running under a 64-bit kernel. They tracked this down to sigaltstack(2) enforcing the alternative signal stack to be at least SIGMINSTKSZ bytes, which is higher for native arm64 tasks than compat 32-bit tasks. These patches resolve the issue by allowing an architecture to define COMPAT_SIGMINSTKSZ for compat tasks, which is then used by the sigaltstack checking code. Feedback welcome, Will --->8 Will Deacon (2): signal: Introduce COMPAT_SIGMINSTKSZ for use in compat_sys_sigaltstack arm64: compat: Provide definition for COMPAT_SIGMINSTKSZ arch/arm64/include/asm/compat.h | 1 + include/linux/compat.h | 3 +++ kernel/signal.c | 14 +++++++++----- 3 files changed, 13 insertions(+), 5 deletions(-) -- 2.1.4
next reply other threads:[~2018-07-25 13:45 UTC|newest] Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-07-25 13:45 Will Deacon [this message] 2018-07-25 13:45 ` [PATCH 0/2] Don't use SIGMINSTKSZ when enforcing alternative signal stack size for compat tasks Will Deacon 2018-07-25 13:45 ` [PATCH 1/2] signal: Introduce COMPAT_SIGMINSTKSZ for use in compat_sys_sigaltstack Will Deacon 2018-07-25 13:45 ` Will Deacon 2018-07-25 15:54 ` Dave Martin 2018-07-25 15:54 ` Dave Martin 2018-07-25 16:37 ` Will Deacon 2018-07-25 16:37 ` Will Deacon 2018-07-26 10:44 ` Dave Martin 2018-07-26 10:44 ` Dave Martin 2018-07-25 13:45 ` [PATCH 2/2] arm64: compat: Provide definition for COMPAT_SIGMINSTKSZ Will Deacon 2018-07-25 13:45 ` Will Deacon 2018-07-25 15:55 ` Dave Martin 2018-07-25 15:55 ` Dave Martin 2019-07-29 20:23 ` [PATCH 0/2] Don't use SIGMINSTKSZ when enforcing alternative signal stack size for compat tasks Aurelien Jarno 2019-07-29 20:23 ` Aurelien Jarno 2019-07-30 9:27 ` Will Deacon 2019-07-30 9:27 ` Will Deacon
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