x86/ibt,entry: Sprinkle ENDBR dust

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Kernel entry points should be having ENDBR on for IBT configs.

The SYSCALL entry points are found through taking their respective
address in order to program them in the MSRs, while the exception
entry points are found through UNWIND_HINT_IRET_REGS.

The rule is that any UNWIND_HINT_IRET_REGS at sym+0 should have an
ENDBR, see the later objtool ibt validation patch.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lore.kernel.org/r/20220308154317.933157479@infradead.org

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This commit is contained in:

Peter Zijlstra 2022-03-08 16:30:24 +01:00

parent 5b2fc51576

commit 8f93402b92

6 changed files with 29 additions and 13 deletions

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7

arch/x86/entry/entry_64.S

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3

arch/x86/entry/entry_64_compat.S

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20

arch/x86/include/asm/idtentry.h

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3

arch/x86/include/asm/segment.h

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4

arch/x86/kernel/head_64.S

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arch/x86/kernel/idt.c

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