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authorKees Cook <keescook@chromium.org>2018-04-10 16:32:44 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-04-11 10:28:35 -0700
commit2cfe0d3009418a132b93d78642a8059a38fe5944 (patch)
treebe663132e62f3c0bffff1db9b13ee895b2ce6707 /include/linux/compiler-clang.h
parentd4ef8d3ff005c70f6c9e2ffea14cc65fc8fe328d (diff)
task_struct: only use anon struct under randstruct plugin
The original intent for always adding the anonymous struct in task_struct was to make sure we had compiler coverage. However, this caused pathological padding of 40 bytes at the start of task_struct. Instead, move the anonymous struct to being only used when struct layout randomization is enabled. Link: http://lkml.kernel.org/r/20180327213609.GA2964@beast Fixes: 29e48ce87f1e ("task_struct: Allow randomized") Signed-off-by: Kees Cook <keescook@chromium.org> Reported-by: Peter Zijlstra <peterz@infradead.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/compiler-clang.h')
-rw-r--r--include/linux/compiler-clang.h3
1 files changed, 0 insertions, 3 deletions
diff --git a/include/linux/compiler-clang.h b/include/linux/compiler-clang.h
index d3f264a5b04d..ceb96ecab96e 100644
--- a/include/linux/compiler-clang.h
+++ b/include/linux/compiler-clang.h
@@ -17,9 +17,6 @@
*/
#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
-#define randomized_struct_fields_start struct {
-#define randomized_struct_fields_end };
-
/* all clang versions usable with the kernel support KASAN ABI version 5 */
#define KASAN_ABI_VERSION 5