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https://github.com/archlinuxarm/PKGBUILDs.git
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70 lines
2.7 KiB
Diff
70 lines
2.7 KiB
Diff
From a6a7d9a4ad84da293071fbbbc7eedd2ce51abdf4 Mon Sep 17 00:00:00 2001
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From: "riku.voipio" <riku.voipio@linaro.org>
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Date: Wed, 27 Jan 2016 09:13:57 -0800
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Subject: [PATCH 2/3] sandbox arm64: align stack 16 bytes
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chrome fails to start with user namespace sandboxing:
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[866:866:0120/134742:FATAL:zygote_host_impl_linux.cc(182)] Check failed: process.IsValid().
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Failed to launch zygote process
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With strace..
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clone(child_stack=0x7ffd28fd98, flags=CLONE_NEWUSER|CLONE_NEWPID|CLONE_NEWNET|SIGCHLD) = -1 EINVAL (Invalid argument)
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Which compared to kernel sources[1], shows that stack needs to be 16
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bytes aligned. because stack grows downward, this patch assumes
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PTHREAD_STACK_MIN is dividable by 16 too.
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[1] http://lxr.free-electrons.com/source/arch/arm64/kernel/process.c#L267
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BUG=581018
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R=keescook@chromium.org,jln@chromium.org,rsesek@chromium.org,thakis@chromium.org
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TEST=base_unittests ProcessUtilTest.* and sandbox_linux_unittests NamespaceSandboxTest.*
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Review URL: https://codereview.chromium.org/1617763002
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Cr-Commit-Position: refs/heads/master@{#371809}
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---
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base/process/launch_posix.cc | 2 +-
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sandbox/linux/services/credentials.cc | 3 ++-
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2 files changed, 3 insertions(+), 2 deletions(-)
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diff --git a/base/process/launch_posix.cc b/base/process/launch_posix.cc
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index 4bd3da3..4019de5 100644
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--- a/base/process/launch_posix.cc
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+++ b/base/process/launch_posix.cc
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@@ -736,7 +736,7 @@ NOINLINE pid_t CloneAndLongjmpInChild(unsigned long flags,
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// internal pid cache. The libc interface unfortunately requires
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// specifying a new stack, so we use setjmp/longjmp to emulate
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// fork-like behavior.
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- char stack_buf[PTHREAD_STACK_MIN];
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+ char stack_buf[PTHREAD_STACK_MIN] ALIGNAS(16);
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#if defined(ARCH_CPU_X86_FAMILY) || defined(ARCH_CPU_ARM_FAMILY) || \
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defined(ARCH_CPU_MIPS64_FAMILY) || defined(ARCH_CPU_MIPS_FAMILY)
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// The stack grows downward.
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diff --git a/sandbox/linux/services/credentials.cc b/sandbox/linux/services/credentials.cc
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index fb6b6b4..76038af 100644
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--- a/sandbox/linux/services/credentials.cc
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+++ b/sandbox/linux/services/credentials.cc
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@@ -16,6 +16,7 @@
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#include <unistd.h>
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#include "base/bind.h"
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+#include "base/compiler_specific.h"
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#include "base/files/file_path.h"
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#include "base/files/file_util.h"
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#include "base/logging.h"
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@@ -94,7 +95,7 @@ bool ChrootToSafeEmptyDir() {
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// /proc/tid directory for the thread (since /proc may not be aware of the
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// PID namespace). With a process, we can just use /proc/self.
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pid_t pid = -1;
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- char stack_buf[PTHREAD_STACK_MIN];
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+ char stack_buf[PTHREAD_STACK_MIN] ALIGNAS(16);
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#if defined(ARCH_CPU_X86_FAMILY) || defined(ARCH_CPU_ARM_FAMILY) || \
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defined(ARCH_CPU_MIPS64_FAMILY) || defined(ARCH_CPU_MIPS_FAMILY)
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// The stack grows downward.
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--
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2.7.2
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