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https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9.git
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Prarit Bhargava
25712fab5a
JIRA: https://issues.redhat.com/browse/RHEL-25415 commit 25e73b7e3f72a25aa30cbb2eecb49036e0acf066 Author: Peter Zijlstra <peterz@infradead.org> Date: Wed Aug 2 12:55:46 2023 +0200 x86/ibt: Suppress spurious ENDBR It was reported that under certain circumstances GCC emits ENDBR instructions for _THIS_IP_ usage. Specifically, when it appears at the start of a basic block -- but not elsewhere. Since _THIS_IP_ is never used for control flow, these ENDBR instructions are completely superfluous. Override the _THIS_IP_ definition for x86_64 to avoid this. Less ENDBR instructions is better. Fixes: 156ff4a544ae ("x86/ibt: Base IBT bits") Reported-by: David Kaplan <David.Kaplan@amd.com> Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/20230802110323.016197440@infradead.org Signed-off-by: Prarit Bhargava <prarit@redhat.com>
14 lines
346 B
C
14 lines
346 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_INSTRUCTION_POINTER_H
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#define _LINUX_INSTRUCTION_POINTER_H
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#include <asm/linkage.h>
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#define _RET_IP_ (unsigned long)__builtin_return_address(0)
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#ifndef _THIS_IP_
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#define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; })
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#endif
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#endif /* _LINUX_INSTRUCTION_POINTER_H */
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