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authorLinus Torvalds <torvalds@linux-foundation.org>2015-12-17 20:57:27 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-12-17 20:57:27 +0300
commit5b24a7a2aa2040c8c50c3b71122901d01661ff78 (patch)
treeb7c953730df4a96ee18ed4d082fee57fb9ad305a /include/linux/uaccess.h
parent11f1a4b9755f5dbc3e822a96502ebe9b044b14d8 (diff)
downloadlinux-5b24a7a2aa2040c8c50c3b71122901d01661ff78.tar.xz
Add 'unsafe' user access functions for batched accesses
The naming is meant to discourage random use: the helper functions are not really any more "unsafe" than the traditional double-underscore functions (which need the address range checking), but they do need even more infrastructure around them, and should not be used willy-nilly. In addition to checking the access range, these user access functions require that you wrap the user access with a "user_acess_{begin,end}()" around it. That allows architectures that implement kernel user access control (x86: SMAP, arm64: PAN) to do the user access control in the wrapping user_access_begin/end part, and then batch up the actual user space accesses using the new interfaces. The main (and hopefully only) use for these are for core generic access helpers, initially just the generic user string functions (strnlen_user() and strncpy_from_user()). Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/uaccess.h')
-rw-r--r--include/linux/uaccess.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h
index 558129af828a..349557825428 100644
--- a/include/linux/uaccess.h
+++ b/include/linux/uaccess.h
@@ -111,4 +111,11 @@ extern long strncpy_from_unsafe(char *dst, const void *unsafe_addr, long count);
#define probe_kernel_address(addr, retval) \
probe_kernel_read(&retval, addr, sizeof(retval))
+#ifndef user_access_begin
+#define user_access_begin() do { } while (0)
+#define user_access_end() do { } while (0)
+#define unsafe_get_user(x, ptr) __get_user(x, ptr)
+#define unsafe_put_user(x, ptr) __put_user(x, ptr)
+#endif
+
#endif /* __LINUX_UACCESS_H__ */