Description

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix information leak in f2fs_move_inline_dirents() 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.

References 8

• git.kernel.org https://git.kernel.org/stable/c/00b5587326625d0fddb2a5f5a3d4acd950102ace
• git.kernel.org https://git.kernel.org/stable/c/117d4f6687b1f74423b5d398ea95c63b262a8e73
• git.kernel.org https://git.kernel.org/stable/c/2bef8314fcf94ddc27e22d03f237c0fafd00de33
• git.kernel.org https://git.kernel.org/stable/c/4e3b4b170bd43db1d8a93a6bd0ea434b17cc86f7
• git.kernel.org https://git.kernel.org/stable/c/9a5571cff4ffcfc24847df9fd545cc5799ac0ee5
• git.kernel.org https://git.kernel.org/stable/c/a6807ef0f3b3d8508d3b07a2e35de8a91820a014
• git.kernel.org https://git.kernel.org/stable/c/eebaecef0095bb8f493c03982da75c6e7bae1056
• git.kernel.org https://git.kernel.org/stable/c/f07a8d61b6ea81bb3cbe0638af40f8824d6147fd

Remediation