ecryptfs: crypto.c use unaligned byteorder helpers

Fixes the following sparse warnings:
fs/ecryptfs/crypto.c:1036:8: warning: cast to restricted __be32
fs/ecryptfs/crypto.c:1038:8: warning: cast to restricted __be32
fs/ecryptfs/crypto.c:1077:10: warning: cast to restricted __be32
fs/ecryptfs/crypto.c:1103:6: warning: incorrect type in assignment (different base types)
fs/ecryptfs/crypto.c:1105:6: warning: incorrect type in assignment (different base types)
fs/ecryptfs/crypto.c:1124:8: warning: incorrect type in assignment (different base types)
fs/ecryptfs/crypto.c:1241:21: warning: incorrect type in assignment (different base types)
fs/ecryptfs/crypto.c:1244:30: warning: incorrect type in assignment (different base types)
fs/ecryptfs/crypto.c:1414:23: warning: cast to restricted __be32
fs/ecryptfs/crypto.c:1417:32: warning: cast to restricted __be16

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Cc: Michael Halcrow <mhalcrow@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index e2832bc..7b99917 100644 (file)
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -33,6 +33,7 @@
 #include <linux/crypto.h>
 #include <linux/file.h>
 #include <linux/scatterlist.h>
+#include <asm/unaligned.h>
 #include "ecryptfs_kernel.h"
 
 static int
@@ -1032,10 +1033,8 @@ static int contains_ecryptfs_marker(char *data)
 {
        u32 m_1, m_2;
 
-       memcpy(&m_1, data, 4);
-       m_1 = be32_to_cpu(m_1);
-       memcpy(&m_2, (data + 4), 4);
-       m_2 = be32_to_cpu(m_2);
+       m_1 = get_unaligned_be32(data);
+       m_2 = get_unaligned_be32(data + 4);
        if ((m_1 ^ MAGIC_ECRYPTFS_MARKER) == m_2)
                return 1;
        ecryptfs_printk(KERN_DEBUG, "m_1 = [0x%.8x]; m_2 = [0x%.8x]; "
@@ -1073,8 +1072,7 @@ static int ecryptfs_process_flags(struct ecryptfs_crypt_stat *crypt_stat,
        int i;
        u32 flags;
 
-       memcpy(&flags, page_virt, 4);
-       flags = be32_to_cpu(flags);
+       flags = get_unaligned_be32(page_virt);
        for (i = 0; i < ((sizeof(ecryptfs_flag_map)
                          / sizeof(struct ecryptfs_flag_map_elem))); i++)
                if (flags & ecryptfs_flag_map[i].file_flag) {
@@ -1100,11 +1098,9 @@ static void write_ecryptfs_marker(char *page_virt, size_t *written)
 
        get_random_bytes(&m_1, (MAGIC_ECRYPTFS_MARKER_SIZE_BYTES / 2));
        m_2 = (m_1 ^ MAGIC_ECRYPTFS_MARKER);
-       m_1 = cpu_to_be32(m_1);
-       memcpy(page_virt, &m_1, (MAGIC_ECRYPTFS_MARKER_SIZE_BYTES / 2));
-       m_2 = cpu_to_be32(m_2);
-       memcpy(page_virt + (MAGIC_ECRYPTFS_MARKER_SIZE_BYTES / 2), &m_2,
-              (MAGIC_ECRYPTFS_MARKER_SIZE_BYTES / 2));
+       put_unaligned_be32(m_1, page_virt);
+       page_virt += (MAGIC_ECRYPTFS_MARKER_SIZE_BYTES / 2);
+       put_unaligned_be32(m_2, page_virt);
        (*written) = MAGIC_ECRYPTFS_MARKER_SIZE_BYTES;
 }
 
@@ -1121,8 +1117,7 @@ write_ecryptfs_flags(char *page_virt, struct ecryptfs_crypt_stat *crypt_stat,
                        flags |= ecryptfs_flag_map[i].file_flag;
        /* Version is in top 8 bits of the 32-bit flag vector */
        flags |= ((((u8)crypt_stat->file_version) << 24) & 0xFF000000);
-       flags = cpu_to_be32(flags);
-       memcpy(page_virt, &flags, 4);
+       put_unaligned_be32(flags, page_virt);
        (*written) = 4;
 }
 
@@ -1238,11 +1233,9 @@ ecryptfs_write_header_metadata(char *virt,
        num_header_extents_at_front =
                (u16)(crypt_stat->num_header_bytes_at_front
                      / crypt_stat->extent_size);
-       header_extent_size = cpu_to_be32(header_extent_size);
-       memcpy(virt, &header_extent_size, 4);
+       put_unaligned_be32(header_extent_size, virt);
        virt += 4;
-       num_header_extents_at_front = cpu_to_be16(num_header_extents_at_front);
-       memcpy(virt, &num_header_extents_at_front, 2);
+       put_unaligned_be16(num_header_extents_at_front, virt);
        (*written) = 6;
 }
 
@@ -1410,15 +1403,13 @@ static int parse_header_metadata(struct ecryptfs_crypt_stat *crypt_stat,
        u32 header_extent_size;
        u16 num_header_extents_at_front;
 
-       memcpy(&header_extent_size, virt, sizeof(u32));
-       header_extent_size = be32_to_cpu(header_extent_size);
-       virt += sizeof(u32);
-       memcpy(&num_header_extents_at_front, virt, sizeof(u16));
-       num_header_extents_at_front = be16_to_cpu(num_header_extents_at_front);
+       header_extent_size = get_unaligned_be32(virt);
+       virt += sizeof(__be32);
+       num_header_extents_at_front = get_unaligned_be16(virt);
        crypt_stat->num_header_bytes_at_front =
                (((size_t)num_header_extents_at_front
                  * (size_t)header_extent_size));
-       (*bytes_read) = (sizeof(u32) + sizeof(u16));
+       (*bytes_read) = (sizeof(__be32) + sizeof(__be16));
        if ((validate_header_size == ECRYPTFS_VALIDATE_HEADER_SIZE)
            && (crypt_stat->num_header_bytes_at_front
                < ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE)) {