From: Petr Mladek <pmladek@suse.com>
To: Michael Ellerman <mpe@ellerman.id.au>
Cc: Miroslav Benes <mbenes@suse.cz>, Petr Mladek <pmladek@suse.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
Daniel Borkmann <daniel@iogearbox.net>,
Alexei Starovoitov <ast@kernel.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
Brendan Gregg <brendan.d.gregg@gmail.com>,
Christoph Hellwig <hch@lst.de>
Subject: [PATCH] powerpc/bpf: Enable bpf_probe_read{, str}() on powerpc again
Date: Wed, 27 May 2020 14:28:44 +0200 [thread overview]
Message-ID: <20200527122844.19524-1-pmladek@suse.com> (raw)
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.
Signed-off-by: Petr Mladek <pmladek@suse.com>
To: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-kernel@vger.kernel.org
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Christoph Hellwig <hch@lst.de>
---
arch/powerpc/Kconfig | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index d13b5328ca10..b29d7cb38368 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
--
2.26.2
next reply other threads:[~2020-05-27 12:29 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-27 12:28 Petr Mladek [this message]
2020-05-28 1:03 ` [PATCH] powerpc/bpf: Enable bpf_probe_read{, str}() on powerpc again Michael Ellerman
2020-05-28 9:13 ` Petr Mladek
2020-05-28 12:23 ` Michael Ellerman
2020-05-28 15:06 ` Daniel Borkmann
2020-05-29 0:05 ` Michael Ellerman
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