Hi,
just kernel-doc fixes:
On 9/4/19 1:19 PM, Aleksa Sarai wrote:
diff --git a/lib/struct_user.c b/lib/struct_user.c
new file mode 100644
index 000000000000..7301ab1bbe98
--- /dev/null
+++ b/lib/struct_user.c
@@ -0,0 +1,182 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2019 SUSE LLC
+ * Copyright (C) 2019 Aleksa Sarai <cyphar@xxxxxxxxxx>
+ */
+
+#include <linux/types.h>
+#include <linux/export.h>
+#include <linux/uaccess.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+
+#define BUFFER_SIZE 64
+
+
+/**
+ * copy_struct_to_user: copy a struct to user space
use correct format:
* copy_struct_to_user - copy a struct to user space
+ * @dst: Destination address, in user space.
+ * @usize: Size of @dst struct.
+ * @src: Source address, in kernel space.
+ * @ksize: Size of @src struct.
+ *
+ * Copies a struct from kernel space to user space, in a way that guarantees
+ * backwards-compatibility for struct syscall arguments (as long as future
+ * struct extensions are made such that all new fields are *appended* to the
+ * old struct, and zeroed-out new fields have the same meaning as the old
+ * struct).
+ *
+ * @ksize is just sizeof(*dst), and @usize should've been passed by user space.
+ * The recommended usage is something like the following:
+ *
+ * SYSCALL_DEFINE2(foobar, struct foo __user *, uarg, size_t, usize)
+ * {
+ * int err;
+ * struct foo karg = {};
+ *
+ * // do something with karg
+ *
+ * err = copy_struct_to_user(uarg, usize, &karg, sizeof(karg));
+ * if (err)
+ * return err;
+ *
+ * // ...
+ * }
+ *
+ * There are three cases to consider:
+ * * If @usize == @ksize, then it's copied verbatim.
+ * * If @usize < @ksize, then kernel space is "returning" a newer struct to an
+ * older user space. In order to avoid user space getting incomplete
+ * information (new fields might be important), all trailing bytes in @src
+ * (@ksize - @usize) must be zerored, otherwise -EFBIG is returned.
+ * * If @usize > @ksize, then the kernel is "returning" an older struct to a
+ * newer user space. The trailing bytes in @dst (@usize - @ksize) will be
+ * zero-filled.
+ *
+ * Returns (in all cases, some data may have been copied):
+ * * -EFBIG: (@usize < @ksize) and there are non-zero trailing bytes in @src.
+ * * -EFAULT: access to user space failed.
+ */
+int copy_struct_to_user(void __user *dst, size_t usize,
+ const void *src, size_t ksize)
+{
+ size_t size = min(ksize, usize);
+ size_t rest = abs(ksize - usize);
+
+ if (unlikely(usize > PAGE_SIZE))
+ return -EFAULT;
+ if (unlikely(!access_ok(dst, usize)))
+ return -EFAULT;
+
+ /* Deal with trailing bytes. */
+ if (usize < ksize) {
+ if (memchr_inv(src + size, 0, rest))
+ return -EFBIG;
+ } else if (usize > ksize) {
+ if (__memzero_user(dst + size, rest))
+ return -EFAULT;
+ }
+ /* Copy the interoperable parts of the struct. */
+ if (__copy_to_user(dst, src, size))
+ return -EFAULT;
+ return 0;
+}
+EXPORT_SYMBOL(copy_struct_to_user);
+
+/**
same here:
+ * copy_struct_from_user: copy a struct from user space
* copy_struct_from_user - copy a struct from user space
+ * @dst: Destination address, in kernel space. This buffer must be @ksize
+ * bytes long.
+ * @ksize: Size of @dst struct.
+ * @src: Source address, in user space.
+ * @usize: (Alleged) size of @src struct.
+ *
+ * Copies a struct from user space to kernel space, in a way that guarantees
+ * backwards-compatibility for struct syscall arguments (as long as future
+ * struct extensions are made such that all new fields are *appended* to the
+ * old struct, and zeroed-out new fields have the same meaning as the old
+ * struct).
+ *
+ * @ksize is just sizeof(*dst), and @usize should've been passed by user space.
+ * The recommended usage is something like the following:
+ *
+ * SYSCALL_DEFINE2(foobar, const struct foo __user *, uarg, size_t, usize)
+ * {
+ * int err;
+ * struct foo karg = {};
+ *
+ * err = copy_struct_from_user(&karg, sizeof(karg), uarg, size);
+ * if (err)
+ * return err;
+ *
+ * // ...
+ * }
+ *
+ * There are three cases to consider:
+ * * If @usize == @ksize, then it's copied verbatim.
+ * * If @usize < @ksize, then the user space has passed an old struct to a
+ * newer kernel. The rest of the trailing bytes in @dst (@ksize - @usize)
+ * are to be zero-filled.
+ * * If @usize > @ksize, then the user space has passed a new struct to an
+ * older kernel. The trailing bytes unknown to the kernel (@usize - @ksize)
+ * are checked to ensure they are zeroed, otherwise -E2BIG is returned.
+ *
+ * Returns (in all cases, some data may have been copied):
+ * * -E2BIG: (@usize > @ksize) and there are non-zero trailing bytes in @src.
+ * * -E2BIG: @usize is "too big" (at time of writing, >PAGE_SIZE).
+ * * -EFAULT: access to user space failed.
+ */
+int copy_struct_from_user(void *dst, size_t ksize,
+ const void __user *src, size_t usize)
+{
+ size_t size = min(ksize, usize);
+ size_t rest = abs(ksize - usize);
+
+ if (unlikely(usize > PAGE_SIZE))
+ return -EFAULT;
+ if (unlikely(!access_ok(src, usize)))
+ return -EFAULT;
+
+ /* Deal with trailing bytes. */
+ if (usize < ksize)
+ memset(dst + size, 0, rest);
+ else if (usize > ksize) {
+ const void __user *addr = src + size;
+ char buffer[BUFFER_SIZE] = {};
+
+ while (rest > 0) {
+ size_t bufsize = min(rest, sizeof(buffer));
+
+ if (__copy_from_user(buffer, addr, bufsize))
+ return -EFAULT;
+ if (memchr_inv(buffer, 0, bufsize))
+ return -E2BIG;
+
+ addr += bufsize;
+ rest -= bufsize;
+ }
+ }
+ /* Copy the interoperable parts of the struct. */
+ if (__copy_from_user(dst, src, size))
+ return -EFAULT;
+ return 0;
+}
+EXPORT_SYMBOL(copy_struct_from_user);
thanks.
--
~Randy
