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randstruct: Reorganize Kconfigs and attribute macros

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In preparation for Clang supporting randstruct, reorganize the Kconfigs,
move the attribute macros, and generalize the feature to be named
CONFIG_RANDSTRUCT for on/off, CONFIG_RANDSTRUCT_FULL for the full
randomization mode, and CONFIG_RANDSTRUCT_PERFORMANCE for the cache-line
sized mode.

Cc: linux-hardening@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20220503205503.3054173-4-keescook@chromium.org
This commit is contained in:
Kees Cook 2022-05-03 13:55:00 -07:00
parent d364658970
commit 595b893e20
10 changed files with 81 additions and 66 deletions
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8
include/linux/compiler-gcc.h
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@ -66,14 +66,6 @@
__builtin_unreachable(); \
} while (0)
#if defined(RANDSTRUCT_PLUGIN) && !defined(__CHECKER__)
#define __randomize_layout __attribute__((randomize_layout))
#define __no_randomize_layout __attribute__((no_randomize_layout))
/* This anon struct can add padding, so only enable it under randstruct. */
#define randomized_struct_fields_start struct {
#define randomized_struct_fields_end } __randomize_layout;
#endif
/*
* GCC 'asm goto' miscompiles certain code sequences:
*