diff options
author | Sami Tolvanen <samitolvanen@google.com> | 2020-04-27 09:00:07 -0700 |
---|---|---|
committer | Will Deacon <will@kernel.org> | 2020-05-15 16:35:45 +0100 |
commit | d08b9f0ca6605e13dcb48f04e55a30545b3c71eb (patch) | |
tree | 177893706ae16d9302dda4ee5f4894ac02e9b24e /include/linux/compiler_types.h | |
parent | 6a8b55ed4056ea5559ebe4f6a4b247f627870d4c (diff) |
scs: Add support for Clang's Shadow Call Stack (SCS)
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 in memory, which means an attacker capable reading
and writing arbitrary memory may be able to locate them and hijack
control flow by modifying the stacks.
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
[will: Numerous cosmetic changes]
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'include/linux/compiler_types.h')
-rw-r--r-- | include/linux/compiler_types.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h index e970f97a7fcb..97b62f47a80d 100644 --- a/include/linux/compiler_types.h +++ b/include/linux/compiler_types.h @@ -193,6 +193,10 @@ struct ftrace_likely_data { # define randomized_struct_fields_end #endif +#ifndef __noscs +# define __noscs +#endif + #ifndef asm_volatile_goto #define asm_volatile_goto(x...) asm goto(x) #endif |