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powerpc/32s: Add missing call to kuep_lock on syscall entry 

Userspace Execution protection and fast syscall entry were implemented
independently from each other and were both merged in kernel 5.2,
leading to syscall entry missing userspace execution protection.

On syscall entry, execution of user space memory must be
locked in the same way as on exception entry.

Fixes: b86fb88855 ("powerpc/32: implement fast entry for syscalls on non BOOKE")
Cc: stable@vger.kernel.org
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/c65e105b63aaf74f91a14f845bc77192350b84a6.1612796617.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2021-02-08 15:10:20 +00:00 committed by Michael Ellerman
parent 57f48b4b74
commit 57fdfbce89
1 changed files with 3 additions and 0 deletions
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3
arch/powerpc/kernel/entry_32.S
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@ -351,6 +351,9 @@ trace_syscall_entry_irq_off:
.globl transfer_to_syscall
transfer_to_syscall:
#ifdef CONFIG_PPC_BOOK3S_32
kuep_lock r11, r12
#endif
#ifdef CONFIG_TRACE_IRQFLAGS
andi. r12,r9,MSR_EE
beq- trace_syscall_entry_irq_off