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Commit 17fa5771 authored by AKASHI Takahiro's avatar AKASHI Takahiro Committed by Ruchi Kandoi
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arm64: add SIGSYS siginfo for compat task 



Note: This patch is from v6 of Takahiro's proposed
"arm64: add seccomp support" patchset (leecam@google.com)

SIGSYS is primarily used in secure computing to notify tracer.
This patch allows signal handler on compat task to get correct information
with SA_SYSINFO specified when this signal is delivered.

Signed-off-by: default avatarAKASHI Takahiro <takahiro.akashi@linaro.org>
parent f3db62e6

arch/arm64/include/asm/compat.h

+7 −0
Original line number Diff line number Diff line
@@ -205,6 +205,13 @@ typedef struct compat_siginfo { 
			compat_long_t _band;	/* POLL_IN, POLL_OUT, POLL_MSG */

			int _fd;

		} _sigpoll;



		/* SIGSYS */

		struct {

			compat_uptr_t _call_addr; /* calling user insn */

			int _syscall;	/* triggering system call number */

			unsigned int _arch;	/* AUDIT_ARCH_* of syscall */

		} _sigsys;

	} _sifields;

} compat_siginfo_t;

arch/arm64/kernel/signal32.c

+8 −0
Original line number Diff line number Diff line
@@ -186,6 +186,14 @@ int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from) 
		err |= __put_user(from->si_uid, &to->si_uid);

		err |= __put_user((compat_uptr_t)(unsigned long)from->si_ptr, &to->si_ptr);

		break;

#ifdef __ARCH_SIGSYS

	case __SI_SYS:

		err |= __put_user((compat_uptr_t)(unsigned long)

				from->si_call_addr, &to->si_call_addr);

		err |= __put_user(from->si_syscall, &to->si_syscall);

		err |= __put_user(from->si_arch, &to->si_arch);

		break;

#endif

	default: /* this is just in case for now ... */

		err |= __put_user(from->si_pid, &to->si_pid);

		err |= __put_user(from->si_uid, &to->si_uid);