5.4-stable review patch. If anyone has any objections, please let me know.
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From: Max Kellermann max.kellermann@ionos.com
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 --- fs/ext4/acl.h | 5 +++++ 1 file changed, 5 insertions(+)
--- a/fs/ext4/acl.h +++ b/fs/ext4/acl.h @@ -67,6 +67,11 @@ extern int ext4_init_acl(handle_t *, str static inline int 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; } #endif /* CONFIG_EXT4_FS_POSIX_ACL */