UPSTREAM: x86/entry/64: Don't use IST entry for #BP stack
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
BUG=chromium:831269
TEST=Build and boot
Change-Id: I2bb5aece3c789aa3d845d03c9b57f10daf30fd60
Signed-off-by: Guenter Roeck <groeck@chromium.org>
(cherry picked from commit d8ba61ba58c88d5207c1ba2f7d9a2280e7d03be9)
Reviewed-on: https://chromium-review.googlesource.com/1005977
3 files changed
