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ecryptfs: Set s_time_gran to get correct time granularity

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Set the eCryptfs superblock time granularity, using the lower
filesystem's s_time_gran value, to prevent unnecessary inode timestamp
truncation to the granularity of a full second.

The use of utimensat(2) to set a timestamp with nanosecond precision
would trigger this bug. That occurred when using the following utilities
to update timestamps of a file:
  * cp -p: copy a file and preserve its atime and mtime
  * touch -r: touch a file and use a reference file's timestamps

Closes: https://bugs.launchpad.net/ecryptfs/+bug/1890486
Signed-off-by: Frank Hsiao 蕭法宣 <frankhsiao@qnap.com>
[tyhicks: Partially rewrite the commit message]
Signed-off-by: Tyler Hicks <code@tyhicks.com>
This commit is contained in:
Frank Hsiao 蕭法宣
2024-05-17 10:09:55 +00:00
committed by Tyler Hicks
parent c369299895
commit 7d9ebf33d8
1 changed files with 1 additions and 0 deletions
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1
fs/ecryptfs/main.c
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@@ -531,6 +531,7 @@ static int ecryptfs_get_tree(struct fs_context *fc)
s->s_blocksize = path.dentry->d_sb->s_blocksize;
s->s_magic = ECRYPTFS_SUPER_MAGIC;
s->s_stack_depth = path.dentry->d_sb->s_stack_depth + 1;
s->s_time_gran = path.dentry->d_sb->s_time_gran;
rc = -EINVAL;
if (s->s_stack_depth > FILESYSTEM_MAX_STACK_DEPTH) {