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authorLinus Torvalds <torvalds@linux-foundation.org>2022-03-24 04:03:08 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2022-03-24 04:03:08 +0300
commit194dfe88d62ed12d0cf30f6f20734c2d0d111533 (patch)
treef057597d411df53a152ac41ae8bd900aabb94994 /include/linux/uaccess.h
parent9c0e6a89b592f4c4e4d769dbc22d399ab0685159 (diff)
parentaec499c75cf8e0b599be4d559e6922b613085f8f (diff)
downloadlinux-194dfe88d62ed12d0cf30f6f20734c2d0d111533.tar.xz
Merge tag 'asm-generic-5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic
Pull asm-generic updates from Arnd Bergmann: "There are three sets of updates for 5.18 in the asm-generic tree: - The set_fs()/get_fs() infrastructure gets removed for good. This was already gone from all major architectures, but now we can finally remove it everywhere, which loses some particularly tricky and error-prone code. There is a small merge conflict against a parisc cleanup, the solution is to use their new version. - The nds32 architecture ends its tenure in the Linux kernel. The hardware is still used and the code is in reasonable shape, but the mainline port is not actively maintained any more, as all remaining users are thought to run vendor kernels that would never be updated to a future release. - A series from Masahiro Yamada cleans up some of the uapi header files to pass the compile-time checks" * tag 'asm-generic-5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic: (27 commits) nds32: Remove the architecture uaccess: remove CONFIG_SET_FS ia64: remove CONFIG_SET_FS support sh: remove CONFIG_SET_FS support sparc64: remove CONFIG_SET_FS support lib/test_lockup: fix kernel pointer check for separate address spaces uaccess: generalize access_ok() uaccess: fix type mismatch warnings from access_ok() arm64: simplify access_ok() m68k: fix access_ok for coldfire MIPS: use simpler access_ok() MIPS: Handle address errors for accesses above CPU max virtual user address uaccess: add generic __{get,put}_kernel_nofault nios2: drop access_ok() check from __put_user() x86: use more conventional access_ok() definition x86: remove __range_not_ok() sparc64: add __{get,put}_kernel_nofault() nds32: fix access_ok() checks in get/put_user uaccess: fix nios2 and microblaze get_user_8() sparc64: fix building assembly files ...
Diffstat (limited to 'include/linux/uaccess.h')
-rw-r--r--include/linux/uaccess.h59
1 files changed, 19 insertions, 40 deletions
diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h
index bca27b4e5eb2..546179418ffa 100644
--- a/include/linux/uaccess.h
+++ b/include/linux/uaccess.h
@@ -10,46 +10,6 @@
#include <asm/uaccess.h>
-#ifdef CONFIG_SET_FS
-/*
- * Force the uaccess routines to be wired up for actual userspace access,
- * overriding any possible set_fs(KERNEL_DS) still lingering around. Undone
- * using force_uaccess_end below.
- */
-static inline mm_segment_t force_uaccess_begin(void)
-{
- mm_segment_t fs = get_fs();
-
- set_fs(USER_DS);
- return fs;
-}
-
-static inline void force_uaccess_end(mm_segment_t oldfs)
-{
- set_fs(oldfs);
-}
-#else /* CONFIG_SET_FS */
-typedef struct {
- /* empty dummy */
-} mm_segment_t;
-
-#ifndef TASK_SIZE_MAX
-#define TASK_SIZE_MAX TASK_SIZE
-#endif
-
-#define uaccess_kernel() (false)
-#define user_addr_max() (TASK_SIZE_MAX)
-
-static inline mm_segment_t force_uaccess_begin(void)
-{
- return (mm_segment_t) { };
-}
-
-static inline void force_uaccess_end(mm_segment_t oldfs)
-{
-}
-#endif /* CONFIG_SET_FS */
-
/*
* Architectures should provide two primitives (raw_copy_{to,from}_user())
* and get rid of their private instances of copy_{to,from}_user() and
@@ -368,6 +328,25 @@ long strncpy_from_user_nofault(char *dst, const void __user *unsafe_addr,
long count);
long strnlen_user_nofault(const void __user *unsafe_addr, long count);
+#ifndef __get_kernel_nofault
+#define __get_kernel_nofault(dst, src, type, label) \
+do { \
+ type __user *p = (type __force __user *)(src); \
+ type data; \
+ if (__get_user(data, p)) \
+ goto label; \
+ *(type *)dst = data; \
+} while (0)
+
+#define __put_kernel_nofault(dst, src, type, label) \
+do { \
+ type __user *p = (type __force __user *)(dst); \
+ type data = *(type *)src; \
+ if (__put_user(data, p)) \
+ goto label; \
+} while (0)
+#endif
+
/**
* get_kernel_nofault(): safely attempt to read from a location
* @val: read into this variable