* [merged] x86-use-non-set_fs-based-maccess-routines.patch removed from -mm tree
@ 2020-06-10 0:40 akpm
0 siblings, 0 replies; only message in thread
From: akpm @ 2020-06-10 0:40 UTC (permalink / raw)
To: ast, daniel, hch, hpa, mhiramat, mingo, mm-commits, tglx
The patch titled
Subject: x86: use non-set_fs based maccess routines
has been removed from the -mm tree. Its filename was
x86-use-non-set_fs-based-maccess-routines.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Christoph Hellwig <hch@lst.de>
Subject: x86: use non-set_fs based maccess routines
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.
[akpm@linux-foundation.org: coding style fixes]
Link: http://lkml.kernel.org/r/20200521152301.2587579-20-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
arch/x86/include/asm/uaccess.h | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
--- a/arch/x86/include/asm/uaccess.h~x86-use-non-set_fs-based-maccess-routines
+++ a/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 */
_
Patches currently in -mm which might be from hch@lst.de are
amdgpu-a-null-mm-does-not-mean-a-thread-is-a-kthread.patch
kernel-move-use_mm-unuse_mm-to-kthreadc.patch
kernel-move-use_mm-unuse_mm-to-kthreadc-v2.patch
kernel-better-document-the-use_mm-unuse_mm-api-contract.patch
kernel-better-document-the-use_mm-unuse_mm-api-contract-v2.patch
kernel-set-user_ds-in-kthread_use_mm.patch
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2020-06-10 0:40 [merged] x86-use-non-set_fs-based-maccess-routines.patch removed from -mm tree akpm
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