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authorAlexei Starovoitov <ast@plumgrid.com>2015-08-31 08:57:10 -0700
committerDavid S. Miller <davem@davemloft.net>2015-08-31 12:36:10 -0700
commitdbb7ee0e474cc8221de55583f516275693c5b552 (patch)
tree1b3a02e7a92051b57922775bbbd977e69ddcbd2d /lib
parent9dc30648f0708cf063e29470d83f63f8dc8fc430 (diff)
downloadlinux-linaro-stable-dbb7ee0e474cc8221de55583f516275693c5b552.tar.gz
lib: move strncpy_from_unsafe() into mm/maccess.c
To fix build errors: kernel/built-in.o: In function `bpf_trace_printk': bpf_trace.c:(.text+0x11a254): undefined reference to `strncpy_from_unsafe' kernel/built-in.o: In function `fetch_memory_string': trace_kprobe.c:(.text+0x11acf8): undefined reference to `strncpy_from_unsafe' move strncpy_from_unsafe() next to probe_kernel_read/write() which use the same memory access style. Reported-by: Fengguang Wu <fengguang.wu@intel.com> Reported-by: Guenter Roeck <linux@roeck-us.net> Fixes: 1a6877b9c0c2 ("lib: introduce strncpy_from_unsafe()") Signed-off-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'lib')
-rw-r--r--lib/strncpy_from_user.c41
1 files changed, 0 insertions, 41 deletions
diff --git a/lib/strncpy_from_user.c b/lib/strncpy_from_user.c
index ead8c4a068d1..e0af6ff73d14 100644
--- a/lib/strncpy_from_user.c
+++ b/lib/strncpy_from_user.c
@@ -112,44 +112,3 @@ long strncpy_from_user(char *dst, const char __user *src, long count)
return -EFAULT;
}
EXPORT_SYMBOL(strncpy_from_user);
-
-/**
- * strncpy_from_unsafe: - Copy a NUL terminated string from unsafe address.
- * @dst: Destination address, in kernel space. This buffer must be at
- * least @count bytes long.
- * @src: Unsafe address.
- * @count: Maximum number of bytes to copy, including the trailing NUL.
- *
- * Copies a NUL-terminated string from unsafe address to kernel buffer.
- *
- * On success, returns the length of the string INCLUDING the trailing NUL.
- *
- * If access fails, returns -EFAULT (some data may have been copied
- * and the trailing NUL added).
- *
- * If @count is smaller than the length of the string, copies @count-1 bytes,
- * sets the last byte of @dst buffer to NUL and returns @count.
- */
-long strncpy_from_unsafe(char *dst, const void *unsafe_addr, long count)
-{
- mm_segment_t old_fs = get_fs();
- const void *src = unsafe_addr;
- long ret;
-
- if (unlikely(count <= 0))
- return 0;
-
- set_fs(KERNEL_DS);
- pagefault_disable();
-
- do {
- ret = __copy_from_user_inatomic(dst++,
- (const void __user __force *)src++, 1);
- } while (dst[-1] && ret == 0 && src - unsafe_addr < count);
-
- dst[-1] = '\0';
- pagefault_enable();
- set_fs(old_fs);
-
- return ret < 0 ? ret : src - unsafe_addr;
-}