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ext4: apply umask if ACL support is disabled

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commit 484fd6c1de13b336806a967908a927cc0356e312 upstream.

The function ext4_init_acl() calls posix_acl_create() which is
responsible for applying the umask.  But without
CONFIG_EXT4_FS_POSIX_ACL, ext4_init_acl() is an empty inline function,
and nobody applies the umask.

This fixes a bug which causes the umask to be ignored with O_TMPFILE
on ext4:

 https://github.com/MusicPlayerDaemon/MPD/issues/558
 https://bugs.gentoo.org/show_bug.cgi?id=686142#c3
 https://bugzilla.kernel.org/show_bug.cgi?id=203625

Reviewed-by: "J. Bruce Fields" <bfields@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Max Kellermann <max.kellermann@ionos.com>
Link: https://lore.kernel.org/r/20230919081824.1096619-1-max.kellermann@ionos.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Max Kellermann 2023-09-19 10:18:23 +02:00 committed by Greg Kroah-Hartman
parent d2aed8814f
commit 85c12e80c4
1 changed files with 5 additions and 0 deletions
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5
fs/ext4/acl.h
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@ -67,6 +67,11 @@ extern int ext4_init_acl(handle_t *, struct inode *, struct inode *);
static inline int static inline int
ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir) ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)
{ {
/* usually, the umask is applied by posix_acl_create(), but if
ext4 ACL support is disabled at compile time, we need to do
it here, because posix_acl_create() will never be called */
inode->i_mode &= ~current_umask();
return 0; return 0;
} }
#endif /* CONFIG_EXT4_FS_POSIX_ACL */ #endif /* CONFIG_EXT4_FS_POSIX_ACL */