x86/entry/64: Don't use IST entry for #BP stack

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There's nothing IST-worthy about #BP/int3.  We don't allow kprobes
in the small handful of places in the kernel that run at CPL0 with
an invalid stack, and 32-bit kernels have used normal interrupt
gates for #BP forever.

Furthermore, we don't allow kprobes in places that have usergs while
in kernel mode, so "paranoid" is also unnecessary.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org

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Andy Lutomirski 2015-07-23 15:37:48 -07:00 • committed by Thomas Gleixner

parent 06ace26f4e

commit d8ba61ba58

3 changed files with 9 additions and 10 deletions

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2

arch/x86/entry/entry_64.S

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2

arch/x86/kernel/idt.c

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15

arch/x86/kernel/traps.c

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