mirror of
https://github.com/archlinuxarm/PKGBUILDs.git
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152 lines
5.1 KiB
Diff
152 lines
5.1 KiB
Diff
From 0dd13dc36db6d265fe75d054748e94c8bac5821e Mon Sep 17 00:00:00 2001
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From: AKASHI Takahiro <takahiro.akashi@linaro.org>
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Date: Thu, 21 Aug 2014 17:56:45 +0900
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Subject: [PATCH 12/12] arm64: add seccomp support
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secure_computing() is called first in syscall_trace_enter() so that a system
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call will be aborted quickly without doing succeeding syscall tracing,
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contrary to other cases, if seccomp rules deny that system call.
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On compat task, syscall numbers for system calls allowed in seccomp mode 1
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are different from those on normal tasks, and so _NR_seccomp_xxx_32's need
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to be redefined.
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Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
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---
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arch/arm64/Kconfig | 14 ++++++++++++++
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arch/arm64/include/asm/ptrace.h | 1 +
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arch/arm64/include/asm/seccomp.h | 25 +++++++++++++++++++++++++
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arch/arm64/include/asm/unistd.h | 3 +++
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arch/arm64/kernel/entry.S | 2 ++
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arch/arm64/kernel/ptrace.c | 5 +++++
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6 files changed, 50 insertions(+)
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create mode 100644 arch/arm64/include/asm/seccomp.h
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diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
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index a3f9d227d179..2d90708b2c8c 100644
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--- a/arch/arm64/Kconfig
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+++ b/arch/arm64/Kconfig
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@@ -34,6 +34,7 @@ config ARM64
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select HAVE_ARCH_AUDITSYSCALL
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select HAVE_ARCH_JUMP_LABEL
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select HAVE_ARCH_KGDB
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+ select HAVE_ARCH_SECCOMP_FILTER
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select HAVE_ARCH_TRACEHOOK
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select HAVE_C_RECORDMCOUNT
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select HAVE_DEBUG_BUGVERBOSE
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@@ -325,6 +326,19 @@ config ARCH_HAS_CACHE_LINE_SIZE
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source "mm/Kconfig"
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+config SECCOMP
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+ bool "Enable seccomp to safely compute untrusted bytecode"
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+ ---help---
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+ This kernel feature is useful for number crunching applications
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+ that may need to compute untrusted bytecode during their
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+ execution. By using pipes or other transports made available to
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+ the process as file descriptors supporting the read/write
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+ syscalls, it's possible to isolate those applications in
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+ their own address space using seccomp. Once seccomp is
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+ enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
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+ and the task is only allowed to execute a few safe syscalls
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+ defined by each seccomp mode.
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+
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config XEN_DOM0
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def_bool y
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depends on XEN
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diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h
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index 8e4445719e92..e9746486f860 100644
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--- a/arch/arm64/include/asm/ptrace.h
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+++ b/arch/arm64/include/asm/ptrace.h
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@@ -73,6 +73,7 @@
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* with ptrace(PTRACE_SET_SYSCALL)
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*/
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#define RET_SKIP_SYSCALL -1
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+#define RET_SKIP_SYSCALL_TRACE -2
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#define IS_SKIP_SYSCALL(no) ((int)(no & 0xffffffff) == -1)
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#ifndef __ASSEMBLY__
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diff --git a/arch/arm64/include/asm/seccomp.h b/arch/arm64/include/asm/seccomp.h
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new file mode 100644
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index 000000000000..c76fac979629
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--- /dev/null
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+++ b/arch/arm64/include/asm/seccomp.h
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@@ -0,0 +1,25 @@
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+/*
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+ * arch/arm64/include/asm/seccomp.h
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+ *
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+ * Copyright (C) 2014 Linaro Limited
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+ * Author: AKASHI Takahiro <takahiro.akashi@linaro.org>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ */
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+#ifndef _ASM_SECCOMP_H
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+#define _ASM_SECCOMP_H
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+
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+#include <asm/unistd.h>
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+
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+#ifdef CONFIG_COMPAT
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+#define __NR_seccomp_read_32 __NR_compat_read
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+#define __NR_seccomp_write_32 __NR_compat_write
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+#define __NR_seccomp_exit_32 __NR_compat_exit
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+#define __NR_seccomp_sigreturn_32 __NR_compat_rt_sigreturn
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+#endif /* CONFIG_COMPAT */
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+
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+#include <asm-generic/seccomp.h>
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+
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+#endif /* _ASM_SECCOMP_H */
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diff --git a/arch/arm64/include/asm/unistd.h b/arch/arm64/include/asm/unistd.h
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index 6d2bf419431d..49c9aefd24a5 100644
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--- a/arch/arm64/include/asm/unistd.h
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+++ b/arch/arm64/include/asm/unistd.h
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@@ -31,6 +31,9 @@
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* Compat syscall numbers used by the AArch64 kernel.
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*/
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#define __NR_compat_restart_syscall 0
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+#define __NR_compat_exit 1
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+#define __NR_compat_read 3
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+#define __NR_compat_write 4
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#define __NR_compat_sigreturn 119
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#define __NR_compat_rt_sigreturn 173
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diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
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index 88fc4f84c39a..3554d6feb7da 100644
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--- a/arch/arm64/kernel/entry.S
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+++ b/arch/arm64/kernel/entry.S
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@@ -628,6 +628,8 @@ ENDPROC(el0_svc)
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__sys_trace:
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mov x0, sp
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bl syscall_trace_enter
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+ cmp w0, #RET_SKIP_SYSCALL_TRACE // skip syscall and tracing?
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+ b.eq ret_to_user
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cmp w0, #RET_SKIP_SYSCALL // skip syscall?
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b.eq __sys_trace_return_skipped
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adr lr, __sys_trace_return // return address
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diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
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index b29b82576f82..984efa14d2b0 100644
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--- a/arch/arm64/kernel/ptrace.c
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+++ b/arch/arm64/kernel/ptrace.c
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@@ -26,6 +26,7 @@
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#include <linux/smp.h>
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#include <linux/ptrace.h>
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#include <linux/user.h>
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+#include <linux/seccomp.h>
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#include <linux/security.h>
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#include <linux/init.h>
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#include <linux/signal.h>
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@@ -1139,6 +1140,10 @@ asmlinkage int syscall_trace_enter(struct pt_regs *regs)
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{
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unsigned int saved_syscallno = regs->syscallno;
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+ /* Do the secure computing check first; failures should be fast. */
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+ if (secure_computing(regs->syscallno) == -1)
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+ return RET_SKIP_SYSCALL_TRACE;
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+
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if (test_thread_flag(TIF_SYSCALL_TRACE))
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tracehook_report_syscall(regs, PTRACE_SYSCALL_ENTER);
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--
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2.19.0
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