The patch below does not apply to the 5.10-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
Possible dependencies:
594bc43b4103 ("ext4: fix leaking uninitialized memory in fast-commit journal") e9f53353e166 ("ext4: remove expensive flush on fast commit")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 594bc43b410316d70bb42aeff168837888d96810 Mon Sep 17 00:00:00 2001 From: Eric Biggers ebiggers@google.com Date: Sun, 6 Nov 2022 14:48:37 -0800 Subject: [PATCH] ext4: fix leaking uninitialized memory in fast-commit journal
When space at the end of fast-commit journal blocks is unused, make sure to zero it out so that uninitialized memory is not leaked to disk.
Fixes: aa75f4d3daae ("ext4: main fast-commit commit path") Cc: stable@vger.kernel.org # v5.10+ Signed-off-by: Eric Biggers ebiggers@google.com Link: https://lore.kernel.org/r/20221106224841.279231-4-ebiggers@kernel.org Signed-off-by: Theodore Ts'o tytso@mit.edu
diff --git a/fs/ext4/fast_commit.c b/fs/ext4/fast_commit.c index da0c8228cf9c..1e8be0554239 100644 --- a/fs/ext4/fast_commit.c +++ b/fs/ext4/fast_commit.c @@ -737,6 +737,9 @@ static u8 *ext4_fc_reserve_space(struct super_block *sb, int len, u32 *crc) *crc = ext4_chksum(sbi, *crc, tl, EXT4_FC_TAG_BASE_LEN); if (pad_len > 0) ext4_fc_memzero(sb, tl + 1, pad_len, crc); + /* Don't leak uninitialized memory in the unused last byte. */ + *((u8 *)(tl + 1) + pad_len) = 0; + ext4_fc_submit_bh(sb, false);
ret = jbd2_fc_get_buf(EXT4_SB(sb)->s_journal, &bh); @@ -793,6 +796,8 @@ static int ext4_fc_write_tail(struct super_block *sb, u32 crc) dst += sizeof(tail.fc_tid); tail.fc_crc = cpu_to_le32(crc); ext4_fc_memcpy(sb, dst, &tail.fc_crc, sizeof(tail.fc_crc), NULL); + dst += sizeof(tail.fc_crc); + memset(dst, 0, bsize - off); /* Don't leak uninitialized memory. */
ext4_fc_submit_bh(sb, true);