Timothy E Baldwin 428c4a4d0d arm64: ptrace: Fix seccomp of traced syscall -1 (NO_SYSCALL) ... commit df84fe9470 upstream. Since commit f086f67485 ("arm64: ptrace: add support for syscall emulation"), if system call number -1 is called and the process is being traced with PTRACE_SYSCALL, for example by strace, the seccomp check is skipped and -ENOSYS is returned unconditionally (unless altered by the tracer) rather than carrying out action specified in the seccomp filter. The consequence of this is that it is not possible to reliably strace a seccomp based implementation of a foreign system call interface in which r7/x8 is permitted to be -1 on entry to a system call. Also trace_sys_enter and audit_syscall_entry are skipped if a system call is skipped. Fix by removing the in_syscall(regs) check restoring the previous behaviour which is like AArch32, x86 (which uses generic code) and everything else. Cc: Oleg Nesterov <oleg@redhat.com> Cc: Catalin Marinas<catalin.marinas@arm.com> Cc: <stable@vger.kernel.org> Fixes: f086f67485 ("arm64: ptrace: add support for syscall emulation") Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Sudeep Holla <sudeep.holla@arm.com> Tested-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Timothy E Baldwin <T.E.Baldwin99@members.leeds.ac.uk> Link: https://lore.kernel.org/r/90edd33b-6353-1228-791f-0336d94d5f8c@majoroak.me.uk Signed-off-by: Will Deacon <will@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2021-03-04 11:38:32 +01:00
..
boot	arm64: dts: qcom: qrb5165-rb5: fix pm8009 regulators	2021-03-04 11:37:53 +01:00
configs	arm64: defconfig: Build in CONFIG_GPIO_MXC by default	2020-10-26 15:48:58 +08:00
crypto	crypto: arm64/sha - add missing module aliases	2021-03-04 11:38:31 +01:00
include	arm64: Do not pass tagged addresses to __is_lm_address()	2021-02-07 15:37:13 +01:00
kernel	arm64: ptrace: Fix seccomp of traced syscall -1 (NO_SYSCALL)	2021-03-04 11:38:32 +01:00
kvm	KVM: arm64: Filter out v8.1+ events on v8.0 HW	2021-02-03 23:28:41 +01:00
lib	arm64: Change .weak to SYM_FUNC_START_WEAK_PI for arch/arm64/lib/mem*.S	2020-10-30 08:32:31 +00:00
mm	arm64: Do not pass tagged addresses to __is_lm_address()	2021-02-07 15:37:13 +01:00
net	arm64: bpf: Fix branch offset in JIT	2020-09-17 12:05:36 +01:00
xen
Kbuild
Kconfig	kbuild: Hoist '--orphan-handling' into Kconfig	2020-12-01 22:45:36 +09:00
Kconfig.debug	arm64: remove TEXT_OFFSET randomization	2020-06-15 13:10:59 +01:00
Kconfig.platforms	arm64: berlin: Select DW_APB_TIMER_OF	2020-10-26 10:45:03 +01:00
Makefile	arm64: link with -z norelro for LLD or aarch64-elf	2021-01-12 20:18:24 +01:00