| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Thu, 16 Feb 2012 16:35:11 -0500 From: Phillip Susi <psusi@...ntu.com> To: tytso@....edu Cc: linux-ext4@...r.kernel.org, Phillip Susi <psusi@...ntu.com> Subject: [PATCH 1/2] e2image: truncate raw image file to correct size At the end of writing the raw image file, output_meta_data_blocks() wrote a single zero byte. Not only does this cause the last block of the image file to be non sparse, but this was being skipped if there were no leftover sparse bytes from the main loop. This would happen if the source fs happened to have an even multiple of 1MiB of free blocks at the end, leaving the sparse image file shorter than it should be. Instead of writing a null byte, just truncate() the file instead, whether or not there are any leftover sparse bytes. Signed-off-by: Phillip Susi <psusi@...ntu.com> --- misc/e2image.c | 3 +-- 1 files changed, 1 insertions(+), 2 deletions(-) diff --git a/misc/e2image.c b/misc/e2image.c index d888e5a..722737c 100644 --- a/misc/e2image.c +++ b/misc/e2image.c @@ -511,8 +511,7 @@ static void output_meta_data_blocks(ext2_filsys fs, int fd) } } } - if (sparse) - write_block(fd, zero_buf, sparse-1, 1, -1); + ftruncate(fd, lseek(fd, sparse, SEEK_CUR)); ext2fs_free_mem(&zero_buf); ext2fs_free_mem(&buf); } -- 1.7.5.4 -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists