x86/entry: Enable random_kstack_offset support

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Allow for a randomized stack offset on a per-syscall basis, with roughly
5-6 bits of entropy, depending on compiler and word size. Since the
method of offsetting uses macros, this cannot live in the common entry
code (the stack offset needs to be retained for the life of the syscall,
which means it needs to happen at the actual entry point).

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20210401232347.2791257-5-keescook@chromium.org

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Kees Cook 2021-04-01 16:23:45 -07:00 • committed by Thomas Gleixner

parent 39218ff4c6

commit fe950f6020

3 changed files with 20 additions and 0 deletions

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1

arch/x86/Kconfig

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3

arch/x86/entry/common.c

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16

arch/x86/include/asm/entry-common.h

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