From: Petr Mladek Date: Wed, 27 May 2020 12:28:44 +0000 (+0200) Subject: powerpc/bpf: Enable bpf_probe_read{, str}() on powerpc again X-Git-Tag: v5.15~3805^2~11^2~4 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d195b1d1d1196681ac4775e0361e9cca70f740c2;p=platform%2Fkernel%2Flinux-starfive.git powerpc/bpf: Enable bpf_probe_read{, str}() on powerpc again The commit 0ebeea8ca8a4d1d453a ("bpf: Restrict bpf_probe_read{, str}() only to archs where they work") caused that bpf_probe_read{, str}() functions were not longer available on architectures where the same logical address might have different content in kernel and user memory mapping. These architectures should use probe_read_{user,kernel}_str helpers. For backward compatibility, the problematic functions are still available on architectures where the user and kernel address spaces are not overlapping. This is defined CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE. At the moment, these backward compatible functions are enabled only on x86_64, arm, and arm64. Let's do it also on powerpc that has the non overlapping address space as well. Fixes: 0ebeea8ca8a4 ("bpf: Restrict bpf_probe_read{, str}() only to archs where they work") Signed-off-by: Petr Mladek Signed-off-by: Daniel Borkmann Acked-by: Michael Ellerman Link: https://lore.kernel.org/lkml/20200527122844.19524-1-pmladek@suse.com --- diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 924c541a9260..cb042a4ff19a 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -126,6 +126,7 @@ config PPC select ARCH_HAS_MMIOWB if PPC64 select ARCH_HAS_PHYS_TO_DMA select ARCH_HAS_PMEM_API + select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64 select ARCH_HAS_PTE_SPECIAL select ARCH_HAS_MEMBARRIER_CALLBACKS