6337067b2a
commit2cfe0d3009upstream. 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:29e48ce87f("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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
24 lines
685 B
C
24 lines
685 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LINUX_COMPILER_TYPES_H
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#error "Please don't include <linux/compiler-clang.h> directly, include <linux/compiler.h> instead."
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#endif
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/* Some compiler specific definitions are overwritten here
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* for Clang compiler
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*/
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#ifdef uninitialized_var
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#undef uninitialized_var
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#define uninitialized_var(x) x = *(&(x))
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#endif
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/* same as gcc, this was present in clang-2.6 so we can assume it works
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* with any version that can compile the kernel
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*/
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#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
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/* Clang doesn't have a way to turn it off per-function, yet. */
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#ifdef __noretpoline
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#undef __noretpoline
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#endif
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