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ANDROID: Incremental fs: set the correct access to mapped files

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Backing file needs to have write permissions for all users
even though the mounted view doesn't - otherwise incfs can't
change the internal file data.

Bug: 180535478
Test: adb install <apk>
Signed-off-by: Yurii Zubrytskyi <zyy@google.com>
Signed-off-by: Paul Lawrence <paullawrence@google.com>
Change-Id: I5d7915b28072cff1508ba45b56e844cb678ca466
This commit is contained in:
Yurii Zubrytskyi 2021-02-18 09:22:52 -08:00 committed by Paul Lawrence
parent 0b62157672
commit de43680982
1 changed files with 6 additions and 0 deletions
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6
fs/incfs/pseudo_files.c
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@ -863,6 +863,12 @@ static long ioctl_create_mapped_file(struct file *file, void __user *arg)
if (error)
goto out;
error = chmod(file_dentry, args.mode | 0222);
if (error) {
pr_debug("incfs: chmod err: %d\n", error);
goto delete_file;
}
/* Save the file's size as an xattr for easy fetching in future. */
size_attr_value = cpu_to_le64(args.size);
error = vfs_setxattr(file_dentry, INCFS_XATTR_SIZE_NAME,