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powerpc/64s/interrupt: Fix check_return_regs_valid() false positive

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The check_return_regs_valid() can cause a false positive if the return
regs are marked as norestart and they are an HSRR type interrupt,
because the low bit in the bottom of regs->trap causes interrupt type
matching to fail.

This can occcur for example on bare metal with a HV privileged doorbell
interrupt that causes a signal, but do_signal returns early because
get_signal() fails, and takes the "No signal to deliver" path. In this
case no signal was delivered so the return location is not changed so
return SRRs are not invalidated, yet set_trap_norestart is called, which
messes up the match. Building go-1.16.6 is known to reproduce this.

Fix it by using the TRAP() accessor which masks out the low bit.

Fixes: 6eaaf9de35 ("powerpc/64s/interrupt: Check and fix srr_valid without crashing")
Cc: stable@vger.kernel.org # v5.14+
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211026122531.3599918-1-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2021-10-26 22:25:31 +10:00 committed by Michael Ellerman
parent b949d009dd
commit 4a5cb51f3d
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/kernel/interrupt.c
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@ -266,7 +266,7 @@ static void check_return_regs_valid(struct pt_regs *regs)
if (trap_is_scv(regs))
return;
trap = regs->trap;
trap = TRAP(regs);
// EE in HV mode sets HSRRs like 0xea0
if (cpu_has_feature(CPU_FTR_HVMODE) && trap == INTERRUPT_EXTERNAL)
trap = 0xea0;