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| author | Li Wang <liwang@nudt.edu.cn> | 2012-01-19 09:44:36 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-02-13 11:16:58 -0800 |
| commit | 3d1b7976d3697421e04c86c7a782833c83244694 (patch) | |
| tree | 4199417821bef14e054033f89d1b3dbc811f3acd | |
| parent | 69ac25cd32a4032a94c100b52cf52abf6fde90a5 (diff) | |
| download | kernel-common-3d1b7976d3697421e04c86c7a782833c83244694.tar.gz kernel-common-3d1b7976d3697421e04c86c7a782833c83244694.tar.bz2 kernel-common-3d1b7976d3697421e04c86c7a782833c83244694.zip | |
eCryptfs: Infinite loop due to overflow in ecryptfs_write()
commit 684a3ff7e69acc7c678d1a1394fe9e757993fd34 upstream.
ecryptfs_write() can enter an infinite loop when truncating a file to a
size larger than 4G. This only happens on architectures where size_t is
represented by 32 bits.
This was caused by a size_t overflow due to it incorrectly being used to
store the result of a calculation which uses potentially large values of
type loff_t.
[tyhicks@canonical.com: rewrite subject and commit message]
Signed-off-by: Li Wang <liwang@nudt.edu.cn>
Signed-off-by: Yunchuan Wen <wenyunchuan@kylinos.com.cn>
Reviewed-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/ecryptfs/read_write.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/ecryptfs/read_write.c b/fs/ecryptfs/read_write.c index 54eb14caad7b..608c1c3fde1b 100644 --- a/fs/ecryptfs/read_write.c +++ b/fs/ecryptfs/read_write.c @@ -130,7 +130,7 @@ int ecryptfs_write(struct inode *ecryptfs_inode, char *data, loff_t offset, pgoff_t ecryptfs_page_idx = (pos >> PAGE_CACHE_SHIFT); size_t start_offset_in_page = (pos & ~PAGE_CACHE_MASK); size_t num_bytes = (PAGE_CACHE_SIZE - start_offset_in_page); - size_t total_remaining_bytes = ((offset + size) - pos); + loff_t total_remaining_bytes = ((offset + size) - pos); if (fatal_signal_pending(current)) { rc = -EINTR; @@ -141,7 +141,7 @@ int ecryptfs_write(struct inode *ecryptfs_inode, char *data, loff_t offset, num_bytes = total_remaining_bytes; if (pos < offset) { /* remaining zeros to write, up to destination offset */ - size_t total_remaining_zeros = (offset - pos); + loff_t total_remaining_zeros = (offset - pos); if (num_bytes > total_remaining_zeros) num_bytes = total_remaining_zeros; |