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 17/23] maccess: move user access routines together Date: Thu, 21 May 2020 17:22:55 +0200 [thread overview] Message-ID: <20200521152301.2587579-18-hch@lst.de> (raw) In-Reply-To: <20200521152301.2587579-1-hch@lst.de> Move kernel access vs user access routines together to ease upcoming ifdefs. Signed-off-by: Christoph Hellwig <hch@lst.de> --- mm/maccess.c | 110 +++++++++++++++++++++++++-------------------------- 1 file changed, 55 insertions(+), 55 deletions(-) diff --git a/mm/maccess.c b/mm/maccess.c index 81a85c1e71165..ffde1ae86ec51 100644 --- a/mm/maccess.c +++ b/mm/maccess.c @@ -46,34 +46,6 @@ long probe_kernel_read(void *dst, const void *src, size_t size) } EXPORT_SYMBOL_GPL(probe_kernel_read); -/** - * probe_user_read(): safely attempt to read from a user-space location - * @dst: pointer to the buffer that shall take the data - * @src: address to read from. This must be a user address. - * @size: size of the data chunk - * - * Safely read from user address @src to the buffer at @dst. If a kernel fault - * happens, handle that and return -EFAULT. - */ -long probe_user_read(void *dst, const void __user *src, size_t size) -{ - long ret = -EFAULT; - mm_segment_t old_fs = get_fs(); - - set_fs(USER_DS); - if (access_ok(src, size)) { - pagefault_disable(); - ret = __copy_from_user_inatomic(dst, src, size); - pagefault_enable(); - } - set_fs(old_fs); - - if (ret) - return -EFAULT; - return 0; -} -EXPORT_SYMBOL_GPL(probe_user_read); - /** * probe_kernel_write(): safely attempt to write to a location * @dst: address to write to @@ -99,33 +71,6 @@ long probe_kernel_write(void *dst, const void *src, size_t size) return 0; } -/** - * probe_user_write(): safely attempt to write to a user-space location - * @dst: address to write to - * @src: pointer to the data that shall be written - * @size: size of the data chunk - * - * Safely write to address @dst from the buffer at @src. If a kernel fault - * happens, handle that and return -EFAULT. - */ -long probe_user_write(void __user *dst, const void *src, size_t size) -{ - long ret = -EFAULT; - mm_segment_t old_fs = get_fs(); - - set_fs(USER_DS); - if (access_ok(dst, size)) { - pagefault_disable(); - ret = __copy_to_user_inatomic(dst, src, size); - pagefault_enable(); - } - set_fs(old_fs); - - if (ret) - return -EFAULT; - return 0; -} - /** * strncpy_from_kernel_nofault: - Copy a NUL terminated string from unsafe * address. @@ -169,6 +114,61 @@ long strncpy_from_kernel_nofault(char *dst, const void *unsafe_addr, long count) return ret ? -EFAULT : src - unsafe_addr; } +/** + * probe_user_read(): safely attempt to read from a user-space location + * @dst: pointer to the buffer that shall take the data + * @src: address to read from. This must be a user address. + * @size: size of the data chunk + * + * Safely read from user address @src to the buffer at @dst. If a kernel fault + * happens, handle that and return -EFAULT. + */ +long probe_user_read(void *dst, const void __user *src, size_t size) +{ + long ret = -EFAULT; + mm_segment_t old_fs = get_fs(); + + set_fs(USER_DS); + if (access_ok(src, size)) { + pagefault_disable(); + ret = __copy_from_user_inatomic(dst, src, size); + pagefault_enable(); + } + set_fs(old_fs); + + if (ret) + return -EFAULT; + return 0; +} +EXPORT_SYMBOL_GPL(probe_user_read); + +/** + * probe_user_write(): safely attempt to write to a user-space location + * @dst: address to write to + * @src: pointer to the data that shall be written + * @size: size of the data chunk + * + * Safely write to address @dst from the buffer at @src. If a kernel fault + * happens, handle that and return -EFAULT. + */ +long probe_user_write(void __user *dst, const void *src, size_t size) +{ + long ret = -EFAULT; + mm_segment_t old_fs = get_fs(); + + set_fs(USER_DS); + if (access_ok(dst, size)) { + pagefault_disable(); + ret = __copy_to_user_inatomic(dst, src, size); + pagefault_enable(); + } + set_fs(old_fs); + + if (ret) + return -EFAULT; + return 0; +} + /** * strncpy_from_user_nofault: - Copy a NUL terminated string from unsafe user * address. -- 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 17/23] maccess: move user access routines together Date: Thu, 21 May 2020 17:22:55 +0200 [thread overview] Message-ID: <20200521152301.2587579-18-hch@lst.de> (raw) In-Reply-To: <20200521152301.2587579-1-hch@lst.de> Move kernel access vs user access routines together to ease upcoming ifdefs. Signed-off-by: Christoph Hellwig <hch@lst.de> --- mm/maccess.c | 110 +++++++++++++++++++++++++-------------------------- 1 file changed, 55 insertions(+), 55 deletions(-) diff --git a/mm/maccess.c b/mm/maccess.c index 81a85c1e71165..ffde1ae86ec51 100644 --- a/mm/maccess.c +++ b/mm/maccess.c @@ -46,34 +46,6 @@ long probe_kernel_read(void *dst, const void *src, size_t size) } EXPORT_SYMBOL_GPL(probe_kernel_read); -/** - * probe_user_read(): safely attempt to read from a user-space location - * @dst: pointer to the buffer that shall take the data - * @src: address to read from. This must be a user address. - * @size: size of the data chunk - * - * Safely read from user address @src to the buffer at @dst. If a kernel fault - * happens, handle that and return -EFAULT. - */ -long probe_user_read(void *dst, const void __user *src, size_t size) -{ - long ret = -EFAULT; - mm_segment_t old_fs = get_fs(); - - set_fs(USER_DS); - if (access_ok(src, size)) { - pagefault_disable(); - ret = __copy_from_user_inatomic(dst, src, size); - pagefault_enable(); - } - set_fs(old_fs); - - if (ret) - return -EFAULT; - return 0; -} -EXPORT_SYMBOL_GPL(probe_user_read); - /** * probe_kernel_write(): safely attempt to write to a location * @dst: address to write to @@ -99,33 +71,6 @@ long probe_kernel_write(void *dst, const void *src, size_t size) return 0; } -/** - * probe_user_write(): safely attempt to write to a user-space location - * @dst: address to write to - * @src: pointer to the data that shall be written - * @size: size of the data chunk - * - * Safely write to address @dst from the buffer at @src. If a kernel fault - * happens, handle that and return -EFAULT. - */ -long probe_user_write(void __user *dst, const void *src, size_t size) -{ - long ret = -EFAULT; - mm_segment_t old_fs = get_fs(); - - set_fs(USER_DS); - if (access_ok(dst, size)) { - pagefault_disable(); - ret = __copy_to_user_inatomic(dst, src, size); - pagefault_enable(); - } - set_fs(old_fs); - - if (ret) - return -EFAULT; - return 0; -} - /** * strncpy_from_kernel_nofault: - Copy a NUL terminated string from unsafe * address. @@ -169,6 +114,61 @@ long strncpy_from_kernel_nofault(char *dst, const void *unsafe_addr, long count) return ret ? -EFAULT : src - unsafe_addr; } +/** + * probe_user_read(): safely attempt to read from a user-space location + * @dst: pointer to the buffer that shall take the data + * @src: address to read from. This must be a user address. + * @size: size of the data chunk + * + * Safely read from user address @src to the buffer at @dst. If a kernel fault + * happens, handle that and return -EFAULT. + */ +long probe_user_read(void *dst, const void __user *src, size_t size) +{ + long ret = -EFAULT; + mm_segment_t old_fs = get_fs(); + + set_fs(USER_DS); + if (access_ok(src, size)) { + pagefault_disable(); + ret = __copy_from_user_inatomic(dst, src, size); + pagefault_enable(); + } + set_fs(old_fs); + + if (ret) + return -EFAULT; + return 0; +} +EXPORT_SYMBOL_GPL(probe_user_read); + +/** + * probe_user_write(): safely attempt to write to a user-space location + * @dst: address to write to + * @src: pointer to the data that shall be written + * @size: size of the data chunk + * + * Safely write to address @dst from the buffer at @src. If a kernel fault + * happens, handle that and return -EFAULT. + */ +long probe_user_write(void __user *dst, const void *src, size_t size) +{ + long ret = -EFAULT; + mm_segment_t old_fs = get_fs(); + + set_fs(USER_DS); + if (access_ok(dst, size)) { + pagefault_disable(); + ret = __copy_to_user_inatomic(dst, src, size); + pagefault_enable(); + } + set_fs(old_fs); + + if (ret) + return -EFAULT; + return 0; +} + /** * strncpy_from_user_nofault: - Copy a NUL terminated string from unsafe user * address. -- 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 15:25 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 ` Christoph Hellwig [this message] 2020-05-21 15:22 ` [PATCH 17/23] maccess: move user access routines together 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 ` [PATCH 19/23] x86: use non-set_fs based maccess routines Christoph Hellwig 2020-05-21 15:22 ` 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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