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622754e84b
The RNG always mixes in the Linux version extremely early in boot. It also always includes a cycle counter, not only during early boot, but each and every time it is invoked prior to being fully initialized. Together, this means that the use of additional xors inside of the various stackprotector.h files is superfluous and over-complicated. Instead, we can get exactly the same thing, but better, by just calling `get_random_canary()`. Acked-by: Guo Ren <guoren@kernel.org> # for csky Acked-by: Catalin Marinas <catalin.marinas@arm.com> # for arm64 Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
21 lines
526 B
C
21 lines
526 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_STACKPROTECTOR_H
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#define _ASM_STACKPROTECTOR_H 1
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extern unsigned long __stack_chk_guard;
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/*
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* Initialize the stackprotector canary value.
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*
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* NOTE: this must only be called from functions that never return,
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* and it must always be inlined.
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*/
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static __always_inline void boot_init_stack_canary(void)
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{
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unsigned long canary = get_random_canary();
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current->stack_canary = canary;
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__stack_chk_guard = current->stack_canary;
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}
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#endif /* __ASM_SH_STACKPROTECTOR_H */
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