From de78a9c42a790011f179bc94a7da3f5d8721f4cc Mon Sep 17 00:00:00 2001 From: Christophe Leroy Date: Thu, 18 Apr 2019 16:51:20 +1000 Subject: powerpc: Add a framework for Kernel Userspace Access Protection This patch implements a framework for Kernel Userspace Access Protection. Then subarches will have the possibility to provide their own implementation by providing setup_kuap() and allow/prevent_user_access(). Some platforms will need to know the area accessed and whether it is accessed from read, write or both. Therefore source, destination and size and handed over to the two functions. mpe: Rename to allow/prevent rather than unlock/lock, and add read/write wrappers. Drop the 32-bit code for now until we have an implementation for it. Add kuap to pt_regs for 64-bit as well as 32-bit. Don't split strings, use pr_crit_ratelimited(). Signed-off-by: Christophe Leroy Signed-off-by: Russell Currey Signed-off-by: Michael Ellerman --- arch/powerpc/kernel/asm-offsets.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'arch/powerpc/kernel') diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c index 86a61e5f8285..66202e02fee2 100644 --- a/arch/powerpc/kernel/asm-offsets.c +++ b/arch/powerpc/kernel/asm-offsets.c @@ -332,6 +332,10 @@ int main(void) STACK_PT_REGS_OFFSET(_PPR, ppr); #endif /* CONFIG_PPC64 */ +#ifdef CONFIG_PPC_KUAP + STACK_PT_REGS_OFFSET(STACK_REGS_KUAP, kuap); +#endif + #if defined(CONFIG_PPC32) #if defined(CONFIG_BOOKE) || defined(CONFIG_40x) DEFINE(EXC_LVL_SIZE, STACK_EXC_LVL_FRAME_SIZE); -- cgit v1.2.3-70-g09d2