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 19/23] x86: use non-set_fs based maccess routines Date: Thu, 21 May 2020 17:22:57 +0200 [thread overview] Message-ID: <20200521152301.2587579-20-hch@lst.de> (raw) In-Reply-To: <20200521152301.2587579-1-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..b3e0a56ae961a 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_GET_KERNEL_NOFAULT + +#define __get_kernel_nofault(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 __put_kernel_nofault(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 19/23] x86: use non-set_fs based maccess routines Date: Thu, 21 May 2020 17:22:57 +0200 [thread overview] Message-ID: <20200521152301.2587579-20-hch@lst.de> (raw) In-Reply-To: <20200521152301.2587579-1-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..b3e0a56ae961a 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_GET_KERNEL_NOFAULT + +#define __get_kernel_nofault(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 __put_kernel_nofault(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:[~2020-05-21 15:24 UTC|newest] Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-05-21 15:22 clean up and streamline probe_kernel_* and friends v4 Christoph Hellwig 2020-05-21 15:22 ` Christoph Hellwig 2020-05-21 15:22 ` [PATCH 01/23] maccess: unexport probe_kernel_write and probe_user_write Christoph Hellwig 2020-05-21 15:22 ` Christoph Hellwig 2020-05-21 15:22 ` [PATCH 02/23] maccess: remove various unused weak aliases Christoph Hellwig 2020-05-21 15:22 ` Christoph Hellwig 2020-05-21 15:22 ` [PATCH 03/23] maccess: remove duplicate kerneldoc comments Christoph Hellwig 2020-05-21 15:22 ` Christoph Hellwig 2020-05-21 15:22 ` [PATCH 04/23] maccess: clarify " Christoph Hellwig 2020-05-21 15:22 ` Christoph Hellwig 2020-05-21 15:22 ` [PATCH 05/23] maccess: update the top of file comment Christoph Hellwig 2020-05-21 15:22 ` Christoph Hellwig 2020-05-21 15:22 ` [PATCH 06/23] maccess: rename strncpy_from_unsafe_user to strncpy_from_user_nofault Christoph Hellwig 2020-05-21 15:22 ` Christoph Hellwig 2020-05-21 15:22 ` [PATCH 07/23] maccess: rename strncpy_from_unsafe_strict to strncpy_from_kernel_nofault Christoph Hellwig 2020-05-21 15:22 ` Christoph Hellwig 2020-05-21 15:22 ` [PATCH 08/23] maccess: rename strnlen_unsafe_user to strnlen_user_nofault Christoph Hellwig 2020-05-21 15:22 ` Christoph Hellwig 2020-05-21 15:22 ` [PATCH 09/23] maccess: remove probe_read_common and probe_write_common Christoph Hellwig 2020-05-21 15:22 ` Christoph Hellwig 2020-05-21 15:22 ` [PATCH 10/23] maccess: unify the probe kernel arch hooks Christoph Hellwig 2020-05-21 15:22 ` Christoph Hellwig 2020-05-28 0:55 ` Andrew Morton 2020-05-28 0:55 ` Andrew Morton 2020-05-21 15:22 ` [PATCH 11/23] bpf: factor out a bpf_trace_copy_string helper Christoph Hellwig 2020-05-21 15:22 ` Christoph Hellwig 2020-05-21 22:10 ` Andrii Nakryiko 2020-05-21 22:10 ` Andrii Nakryiko 2020-05-21 22:10 ` Andrii Nakryiko 2020-05-21 15:22 ` [PATCH 12/23] bpf: handle the compat string in bpf_trace_copy_string better Christoph Hellwig 2020-05-21 15:22 ` Christoph Hellwig 2020-05-21 22:10 ` Andrii Nakryiko 2020-05-21 22:10 ` Andrii Nakryiko 2020-05-21 22:10 ` Andrii Nakryiko 2020-05-28 2:04 ` Andrew Morton 2020-05-28 2:04 ` Andrew Morton 2020-05-28 2:26 ` Yonghong Song 2020-05-28 2:26 ` Yonghong Song 2020-05-28 4:39 ` Christoph Hellwig 2020-05-28 4:39 ` Christoph Hellwig 2020-05-28 17:06 ` Yonghong Song 2020-05-28 17:06 ` Yonghong Song 2020-05-21 15:22 ` [PATCH 13/23] bpf: rework the compat kernel probe handling Christoph Hellwig 2020-05-21 15:22 ` Christoph Hellwig 2020-05-21 22:10 ` Andrii Nakryiko 2020-05-21 22:10 ` Andrii Nakryiko 2020-05-21 22:10 ` Andrii Nakryiko 2020-05-21 15:22 ` [PATCH 14/23] tracing/kprobes: handle mixed kernel/userspace probes better Christoph Hellwig 2020-05-21 15:22 ` Christoph Hellwig 2020-05-22 0:04 ` Masami Hiramatsu 2020-05-22 0:04 ` Masami Hiramatsu 2020-05-21 15:22 ` [PATCH 15/23] maccess: remove strncpy_from_unsafe Christoph Hellwig 2020-05-21 15:22 ` Christoph Hellwig 2020-05-21 15:22 ` [PATCH 16/23] maccess: always use strict semantics for probe_kernel_read Christoph Hellwig 2020-05-21 15:22 ` Christoph Hellwig 2020-05-21 15:22 ` [PATCH 17/23] maccess: move user access routines together Christoph Hellwig 2020-05-21 15:22 ` Christoph Hellwig 2020-05-21 15:22 ` [PATCH 18/23] maccess: allow architectures to provide kernel probing directly Christoph Hellwig 2020-05-21 15:22 ` Christoph Hellwig 2020-05-21 15:22 ` Christoph Hellwig [this message] 2020-05-21 15:22 ` [PATCH 19/23] x86: use non-set_fs based maccess routines Christoph Hellwig 2020-05-21 15:22 ` [PATCH 20/23] maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault Christoph Hellwig 2020-05-21 15:22 ` [PATCH 20/23] maccess: rename probe_kernel_{read, write} to copy_{from, to}_kernel_nofault Christoph Hellwig 2020-05-21 15:22 ` [PATCH 21/23] maccess: rename probe_user_{read,write} to copy_{from,to}_user_nofault Christoph Hellwig 2020-05-21 15:22 ` [PATCH 21/23] maccess: rename probe_user_{read, write} to copy_{from, to}_user_nofault Christoph Hellwig 2020-05-21 15:23 ` [PATCH 22/23] maccess: rename probe_kernel_address to get_kernel_nofault Christoph Hellwig 2020-05-21 15:23 ` Christoph Hellwig 2020-05-21 15:23 ` [PATCH 23/23] maccess: return -ERANGE when copy_from_kernel_nofault_allowed fails Christoph Hellwig 2020-05-21 15:23 ` Christoph Hellwig 2020-05-21 18:03 ` clean up and streamline probe_kernel_* and friends v4 Linus Torvalds 2020-05-21 18:03 ` Linus Torvalds 2020-05-21 18:03 ` Linus Torvalds 2020-05-22 0:22 ` Masami Hiramatsu 2020-05-22 0:22 ` Masami Hiramatsu 2020-05-25 22:19 ` Andrew Morton 2020-05-25 22:19 ` Andrew Morton 2020-05-26 6:13 ` Christoph Hellwig 2020-05-26 6:13 ` Christoph Hellwig 2020-05-28 0:36 ` Andrew Morton 2020-05-28 0:36 ` Andrew Morton
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