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| author |   Richard Weinberger <richard@nod.at> | 2016-09-21 12:21:29 +0200 |
|---|---|---|
| committer | Richard Weinberger <richard@nod.at> | 2016-12-12 23:07:38 +0100 |
| commit | 43b113fea2d427e17e7663494fc70c4e93e83d5e (patch) | |
| tree | 7ba1c37358d90bd2f351e7d32a866fcbe1303b4c /fs/ubifs/xattr.c | |
| parent | ubifs: Add skeleton for fscrypto (diff) | |
| download | linux-dev-43b113fea2d427e17e7663494fc70c4e93e83d5e.tar.xz linux-dev-43b113fea2d427e17e7663494fc70c4e93e83d5e.zip | |
ubifs: Massage ubifs_listxattr() for encryption context
We have to make sure that we don't expose our internal
crypto context to userspace.
Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'fs/ubifs/xattr.c')
| -rw-r--r-- | fs/ubifs/xattr.c | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/fs/ubifs/xattr.c b/fs/ubifs/xattr.c index 95a16028bbdb..77ffc9788f45 100644 --- a/fs/ubifs/xattr.c +++ b/fs/ubifs/xattr.c @@ -397,6 +397,20 @@ out_unlock: return err; } +static bool xattr_visible(const char *name) +{ + /* File encryption related xattrs are for internal use only */ + if (strcmp(name, UBIFS_XATTR_NAME_ENCRYPTION_CONTEXT) == 0) + return false; + + /* Show trusted namespace only for "power" users */ + if (strncmp(name, XATTR_TRUSTED_PREFIX, + XATTR_TRUSTED_PREFIX_LEN) == 0 && !capable(CAP_SYS_ADMIN)) + return false; + + return true; +} + ssize_t ubifs_listxattr(struct dentry *dentry, char *buffer, size_t size) { union ubifs_key key; @@ -432,10 +446,7 @@ ssize_t ubifs_listxattr(struct dentry *dentry, char *buffer, size_t size) nm.name = xent->name; nm.len = le16_to_cpu(xent->nlen); - /* Show trusted namespace only for "power" users */ - if (strncmp(xent->name, XATTR_TRUSTED_PREFIX, - XATTR_TRUSTED_PREFIX_LEN) || - capable(CAP_SYS_ADMIN)) { + if (xattr_visible(xent->name)) { memcpy(buffer + written, nm.name, nm.len + 1); written += nm.len + 1; } |