On Fri, Jun 07, 2019 at 11:14:52AM -0700, Eric Biggers wrote:
>
> Existing versions of chattr can't be changed, and people don't necessarily
> upgrade the kernel and e2fsprogs at the same time. So (1) wouldn't really
> work.
>
> A better solution might be to make FS_IOC_GETFLAGS and FS_IOC_FSGETXATTR never
> return the project inherit flag on regular files.
I've amended this patch by adding the following to fix it for
FS_IOC_GETFLAGS (which is chattr uses):
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 7af835ac8d23..74648d42c69b 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -779,6 +779,8 @@ long ext4_ioctl(struct file *filp, unsigned int cmd,
unsigned long arg)
return ext4_ioc_getfsmap(sb, (void __user *)arg);
case EXT4_IOC_GETFLAGS:
flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
+ if (S_ISREG(inode->i_mode))
+ flags &= ~EXT4_PROJINHERIT_FL;
return put_user(flags, (int __user *) arg);
case EXT4_IOC_SETFLAGS: {
int err;
- Ted
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