From 57fdfbce89137ae85cd5cef48be168040a47dd13 Mon Sep 17 00:00:00 2001 From: Christophe Leroy Date: Mon, 8 Feb 2021 15:10:20 +0000 Subject: 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: b86fb88855ea ("powerpc/32: implement fast entry for syscalls on non BOOKE") Cc: stable@vger.kernel.org Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/c65e105b63aaf74f91a14f845bc77192350b84a6.1612796617.git.christophe.leroy@csgroup.eu --- arch/powerpc/kernel/entry_32.S | 3 +++ 1 file changed, 3 insertions(+) (limited to 'arch/powerpc/kernel/entry_32.S') diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S index b102b40c4988..b1e36602c013 100644 --- a/arch/powerpc/kernel/entry_32.S +++ b/arch/powerpc/kernel/entry_32.S @@ -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 -- cgit v1.2.3