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https://github.com/rd-stuffs/msm-4.14.git
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a7f2106930
This change adds generic support for Clang's Shadow Call Stack, which uses a shadow stack to protect return addresses from being overwritten by an attacker. Details are available here: https://clang.llvm.org/docs/ShadowCallStack.html Note that security guarantees in the kernel differ from the ones documented for user space. The kernel must store addresses of shadow stacks used by other tasks and interrupt handlers in memory, which means an attacker capable reading and writing arbitrary memory may be able to locate them and hijack control flow by modifying shadow stacks that are not currently in use. Bug: 145210207 Change-Id: Ia5f1650593fa95da4efcf86f84830a20989f161c (am from https://lore.kernel.org/patchwork/patch/1149054/) Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
40 lines
1.0 KiB
C
40 lines
1.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/init_task.h>
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#include <linux/export.h>
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#include <linux/mqueue.h>
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#include <linux/sched.h>
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#include <linux/sched/sysctl.h>
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#include <linux/sched/rt.h>
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#include <linux/sched/task.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/scs.h>
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#include <asm/pgtable.h>
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#include <linux/uaccess.h>
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static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
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static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
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/* Initial task structure */
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struct task_struct init_task = INIT_TASK(init_task);
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EXPORT_SYMBOL(init_task);
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#ifdef CONFIG_SHADOW_CALL_STACK
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unsigned long init_shadow_call_stack[SCS_SIZE / sizeof(long)] __init_task_data
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__aligned(SCS_SIZE) = {
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[(SCS_SIZE / sizeof(long)) - 1] = SCS_END_MAGIC
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};
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#endif
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/*
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* Initial thread structure. Alignment of this is handled by a special
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* linker map entry.
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*/
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union thread_union init_thread_union __init_task_data = {
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#ifndef CONFIG_THREAD_INFO_IN_TASK
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INIT_THREAD_INFO(init_task)
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#endif
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};
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