Dave Martin 0fe42512b2 arm64: Fix syscall restarting around signal suppressed by tracer ... Commit 17c2895 ("arm64: Abstract syscallno manipulation") abstracts out the pt_regs.syscallno value for a syscall cancelled by a tracer as NO_SYSCALL, and provides helpers to set and check for this condition. However, the way this was implemented has the unintended side-effect of disabling part of the syscall restart logic. This comes about because the second in_syscall() check in do_signal() re-evaluates the "in a syscall" condition based on the updated pt_regs instead of the original pt_regs. forget_syscall() is explicitly called prior to the second check in order to prevent restart logic in the ret_to_user path being spuriously triggered, which means that the second in_syscall() check always yields false. This triggers a failure in tools/testing/selftests/seccomp/seccomp_bpf.c, when using ptrace to suppress a signal that interrups a nanosleep() syscall. Misbehaviour of this type is only expected in the case where a tracer suppresses a signal and the target process is either being single-stepped or the interrupted syscall attempts to restart via -ERESTARTBLOCK. This patch restores the old behaviour by performing the in_syscall() check only once at the start of the function. Fixes: 17c2895860 ("arm64: Abstract syscallno manipulation") Signed-off-by: Dave Martin <Dave.Martin@arm.com> Reported-by: Sumit Semwal <sumit.semwal@linaro.org> Cc: Will Deacon <will.deacon@arm.com> Cc: <stable@vger.kernel.org> # 4.14.x- Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>		2018-06-08 13:21:39 +01:00
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boot	This pull request contains Broadcom ARM64-based SoCs Device Tree fixes	2018-04-27 10:21:18 +02:00
configs	arm64: defconfig: add CONFIG_UNIPHIER_THERMAL and CONFIG_SNI_AVE	2018-03-27 15:31:19 +02:00
crypto	kbuild: mark $(targets) as .SECONDARY and remove .PRECIOUS markers	2018-04-07 19:04:02 +09:00
include	arm64: KVM: Move VCPU_WORKAROUND_2_FLAG macros to the top of the file	2018-06-02 10:42:54 +01:00
kernel	arm64: Fix syscall restarting around signal suppressed by tracer	2018-06-08 13:21:39 +01:00
kvm	arm64: KVM: Add ARCH_WORKAROUND_2 discovery through ARCH_FEATURES_FUNC_ID	2018-05-31 18:00:59 +01:00
lib	arm64: avoid instrumenting atomic_ll_sc.o	2018-04-27 12:14:44 +01:00
mm	arm64: Unify kernel fault reporting	2018-05-23 11:46:42 +01:00
net	bpf, arm64: fix out of bounds access in tail call	2018-02-22 16:06:28 -08:00
xen	arm64: mm: Add additional parameter to uaccess_ttbr0_disable	2018-01-17 13:57:49 +01:00
Kconfig	arm64: Add ARCH_WORKAROUND_2 probing	2018-05-31 17:34:38 +01:00
Kconfig.debug	arm64: relocation testing module	2017-04-04 17:03:32 +01:00
Kconfig.platforms	arm64: add Renesas R8A77965 support	2018-03-13 19:05:58 +01:00
Makefile	arm64: support __int128 with clang	2018-04-24 19:07:55 +01:00