On 2023/1/23 15:04, Eric Biggers wrote:
From: Eric Biggers ebiggers@google.com
When converting an inline directory to a regular one, f2fs is leaking uninitialized memory to disk because it doesn't initialize the entire directory block. Fix this by zero-initializing the block.
This bug was introduced by commit 4ec17d688d74 ("f2fs: avoid unneeded initializing when converting inline dentry"), which didn't consider the security implications of leaking uninitialized memory to disk.
This was found by running xfstest generic/435 on a KMSAN-enabled kernel.
Fixes: 4ec17d688d74 ("f2fs: avoid unneeded initializing when converting inline dentry") Cc: stable@vger.kernel.org # v4.3+ Signed-off-by: Eric Biggers ebiggers@google.com
Reviewed-by: Chao Yu chao@kernel.org
Thanks,