From: Christoph Hellwig <hch@lst.de> To: x86@kernel.org, Alexei Starovoitov <ast@kernel.org>, Daniel Borkmann <daniel@iogearbox.net>, Masami Hiramatsu <mhiramat@kernel.org>, Linus Torvalds <torvalds@linux-foundation.org>, Andrew Morton <akpm@linux-foundation.org> Cc: linux-parisc@vger.kernel.org, linux-um@lists.infradead.org, netdev@vger.kernel.org, bpf@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH 15/15] x86: use non-set_fs based maccess routines Date: Wed, 6 May 2020 08:22:23 +0200 [thread overview] Message-ID: <20200506062223.30032-16-hch@lst.de> (raw) In-Reply-To: <20200506062223.30032-1-hch@lst.de> Provide arch_kernel_read and arch_kernel_write routines to implement the maccess routines without messing with set_fs and without stac/clac that opens up access to user space. Signed-off-by: Christoph Hellwig <hch@lst.de> --- arch/x86/include/asm/uaccess.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h index d8f283b9a569c..765e18417b3ba 100644 --- a/arch/x86/include/asm/uaccess.h +++ b/arch/x86/include/asm/uaccess.h @@ -523,5 +523,21 @@ do { \ unsafe_copy_loop(__ucu_dst, __ucu_src, __ucu_len, u8, label); \ } while (0) +#define HAVE_ARCH_PROBE_KERNEL + +#define arch_kernel_read(dst, src, type, err_label) \ +do { \ + int __kr_err; \ + \ + __get_user_size(*((type *)dst), (__force type __user *)src, \ + sizeof(type), __kr_err); \ + if (unlikely(__kr_err)) \ + goto err_label; \ +} while (0) + +#define arch_kernel_write(dst, src, type, err_label) \ + __put_user_size(*((type *)(src)), (__force type __user *)(dst), \ + sizeof(type), err_label) + #endif /* _ASM_X86_UACCESS_H */ -- 2.26.2
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de> To: x86@kernel.org, Alexei Starovoitov <ast@kernel.org>, Daniel Borkmann <daniel@iogearbox.net>, Masami Hiramatsu <mhiramat@kernel.org>, Linus Torvalds <torvalds@linux-foundation.org>, Andrew Morton <akpm@linux-foundation.org> Cc: linux-parisc@vger.kernel.org, netdev@vger.kernel.org, linux-um@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, bpf@vger.kernel.org Subject: [PATCH 15/15] x86: use non-set_fs based maccess routines Date: Wed, 6 May 2020 08:22:23 +0200 [thread overview] Message-ID: <20200506062223.30032-16-hch@lst.de> (raw) In-Reply-To: <20200506062223.30032-1-hch@lst.de> Provide arch_kernel_read and arch_kernel_write routines to implement the maccess routines without messing with set_fs and without stac/clac that opens up access to user space. Signed-off-by: Christoph Hellwig <hch@lst.de> --- arch/x86/include/asm/uaccess.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h index d8f283b9a569c..765e18417b3ba 100644 --- a/arch/x86/include/asm/uaccess.h +++ b/arch/x86/include/asm/uaccess.h @@ -523,5 +523,21 @@ do { \ unsafe_copy_loop(__ucu_dst, __ucu_src, __ucu_len, u8, label); \ } while (0) +#define HAVE_ARCH_PROBE_KERNEL + +#define arch_kernel_read(dst, src, type, err_label) \ +do { \ + int __kr_err; \ + \ + __get_user_size(*((type *)dst), (__force type __user *)src, \ + sizeof(type), __kr_err); \ + if (unlikely(__kr_err)) \ + goto err_label; \ +} while (0) + +#define arch_kernel_write(dst, src, type, err_label) \ + __put_user_size(*((type *)(src)), (__force type __user *)(dst), \ + sizeof(type), err_label) + #endif /* _ASM_X86_UACCESS_H */ -- 2.26.2 _______________________________________________ linux-um mailing list linux-um@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-um
next prev parent reply other threads:[~2020-05-06 6:23 UTC|newest] Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-05-06 6:22 clean up and streamline probe_kernel_* and friends Christoph Hellwig 2020-05-06 6:22 ` Christoph Hellwig 2020-05-06 6:22 ` [PATCH 01/15] maccess: unexport probe_kernel_write and probe_user_write Christoph Hellwig 2020-05-06 6:22 ` Christoph Hellwig 2020-05-06 6:22 ` [PATCH 02/15] maccess: remove various unused weak aliases Christoph Hellwig 2020-05-06 6:22 ` Christoph Hellwig 2020-05-06 6:22 ` [PATCH 03/15] maccess: remove duplicate kerneldoc commens Christoph Hellwig 2020-05-06 6:22 ` Christoph Hellwig 2020-05-06 6:22 ` [PATCH 04/15] maccess: clarify kerneldoc comments Christoph Hellwig 2020-05-06 6:22 ` Christoph Hellwig 2020-05-06 6:22 ` [PATCH 05/15] maccess: update the top of file comment Christoph Hellwig 2020-05-06 6:22 ` Christoph Hellwig 2020-05-06 6:22 ` [PATCH 06/15] maccess: rename strncpy_from_unsafe_user to strncpy_from_user_unsafe Christoph Hellwig 2020-05-06 6:22 ` Christoph Hellwig 2020-05-06 6:22 ` [PATCH 07/15] maccess: rename strncpy_from_unsafe_strict to strncpy_from_kernel_unsafe Christoph Hellwig 2020-05-06 6:22 ` Christoph Hellwig 2020-05-06 6:22 ` [PATCH 08/15] maccess: rename strnlen_unsafe_user to strnlen_user_unsafe Christoph Hellwig 2020-05-06 6:22 ` Christoph Hellwig 2020-05-06 17:44 ` Linus Torvalds 2020-05-06 17:44 ` Linus Torvalds 2020-05-06 17:44 ` Linus Torvalds 2020-05-06 17:47 ` Christoph Hellwig 2020-05-06 17:47 ` Christoph Hellwig 2020-05-06 17:57 ` Linus Torvalds 2020-05-06 17:57 ` Linus Torvalds 2020-05-06 17:57 ` Linus Torvalds 2020-05-06 6:22 ` [PATCH 09/15] maccess: remove probe_read_common and probe_write_common Christoph Hellwig 2020-05-06 6:22 ` Christoph Hellwig 2020-05-06 6:22 ` [PATCH 10/15] maccess: unify the probe kernel arch hooks Christoph Hellwig 2020-05-06 6:22 ` Christoph Hellwig 2020-05-06 6:22 ` [PATCH 11/15] maccess: remove strncpy_from_unsafe Christoph Hellwig 2020-05-06 6:22 ` Christoph Hellwig 2020-05-11 5:34 ` Masami Hiramatsu 2020-05-11 5:34 ` Masami Hiramatsu 2020-05-06 6:22 ` [PATCH 12/15] maccess: always use strict semantics for probe_kernel_read Christoph Hellwig 2020-05-06 6:22 ` Christoph Hellwig 2020-05-11 5:05 ` Masami Hiramatsu 2020-05-11 5:05 ` Masami Hiramatsu 2020-05-11 5:27 ` Masami Hiramatsu 2020-05-11 5:27 ` Masami Hiramatsu 2020-05-06 6:22 ` [PATCH 13/15] maccess: move user access routines together Christoph Hellwig 2020-05-06 6:22 ` Christoph Hellwig 2020-05-06 6:22 ` [PATCH 14/15] maccess: allow architectures to provide kernel probing directly Christoph Hellwig 2020-05-06 6:22 ` Christoph Hellwig 2020-05-06 6:22 ` Christoph Hellwig [this message] 2020-05-06 6:22 ` [PATCH 15/15] x86: use non-set_fs based maccess routines Christoph Hellwig 2020-05-06 17:51 ` Linus Torvalds 2020-05-06 17:51 ` Linus Torvalds 2020-05-06 17:51 ` Linus Torvalds 2020-05-06 18:15 ` Christoph Hellwig 2020-05-06 18:15 ` Christoph Hellwig 2020-05-06 19:01 ` Linus Torvalds 2020-05-06 19:01 ` Linus Torvalds 2020-05-06 19:01 ` Linus Torvalds 2020-05-07 5:12 ` Christoph Hellwig 2020-05-07 5:12 ` Christoph Hellwig
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