Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 5.6 173/177] powerpc/bpf: Enable bpf_probe_read{, str}() on powerpc again | Date | Mon, 1 Jun 2020 19:55:11 +0200 |
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From: Petr Mladek <pmladek@suse.com>
commit d195b1d1d1196681ac4775e0361e9cca70f740c2 upstream.
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 <pmladek@suse.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/lkml/20200527122844.19524-1-pmladek@suse.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- arch/powerpc/Kconfig | 1 + 1 file changed, 1 insertion(+)
--- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -125,6 +125,7 @@ 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
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