xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

vfs: Distinguish between full xattr names and proper prefixes

Browse Source 
Add an additional "name" field to struct xattr_handler.  When the name
is set, the handler matches attributes with exactly that name.  When the
prefix is set instead, the handler matches attributes with the given
prefix and with a non-empty suffix.

This patch should avoid bugs like the one fixed in commit c361016a in
the future.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: James Morris <james.l.morris@oracle.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Andreas Gruenbacher
2015-12-02 14:44:36 +01:00
committed by Al Viro
parent 97d7929922
commit 98e9cb5711
22 changed files with 47 additions and 130 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
fs/f2fs/xattr.c
View File

@@ -30,6 +30,7 @@ static size_t f2fs_xattr_generic_list(const struct xattr_handler *handler,
const char *name, size_t len)
{
struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
const char *prefix;
int total_len, prefix_len;
switch (handler->flags) {
@@ -47,10 +48,11 @@ static size_t f2fs_xattr_generic_list(const struct xattr_handler *handler,
return -EINVAL;
}
prefix_len = strlen(handler->prefix);
prefix = xattr_prefix(handler);
prefix_len = strlen(prefix);
total_len = prefix_len + len + 1;
if (list && total_len <= list_size) {
memcpy(list, handler->prefix, prefix_len);
memcpy(list, prefix, prefix_len);
memcpy(list + prefix_len, name, len);
list[prefix_len + len] = '\0';
}
@@ -77,8 +79,6 @@ static int f2fs_xattr_generic_get(const struct xattr_handler *handler,
default:
return -EINVAL;
}
if (strcmp(name, "") == 0)
return -EINVAL;
return f2fs_getxattr(d_inode(dentry), handler->flags, name,
buffer, size, NULL);
}
@@ -103,9 +103,6 @@ static int f2fs_xattr_generic_set(const struct xattr_handler *handler,
default:
return -EINVAL;
}
if (strcmp(name, "") == 0)
return -EINVAL;
return f2fs_setxattr(d_inode(dentry), handler->flags, name,
value, size, NULL, flags);
}
@@ -114,7 +111,7 @@ static size_t f2fs_xattr_advise_list(const struct xattr_handler *handler,
struct dentry *dentry, char *list, size_t list_size,
const char *name, size_t len)
{
const char *xname = F2FS_SYSTEM_ADVISE_PREFIX;
const char *xname = F2FS_SYSTEM_ADVISE_NAME;
size_t size;
size = strlen(xname) + 1;
@@ -129,9 +126,6 @@ static int f2fs_xattr_advise_get(const struct xattr_handler *handler,
{
struct inode *inode = d_inode(dentry);
if (strcmp(name, "") != 0)
return -EINVAL;
if (buffer)
*((char *)buffer) = F2FS_I(inode)->i_advise;
return sizeof(char);
@@ -143,8 +137,6 @@ static int f2fs_xattr_advise_set(const struct xattr_handler *handler,
{
struct inode *inode = d_inode(dentry);
if (strcmp(name, "") != 0)
return -EINVAL;
if (!inode_owner_or_capable(inode))
return -EPERM;
if (value == NULL)
@@ -197,7 +189,7 @@ const struct xattr_handler f2fs_xattr_trusted_handler = {
};
const struct xattr_handler f2fs_xattr_advise_handler = {
.prefix = F2FS_SYSTEM_ADVISE_PREFIX,
.name = F2FS_SYSTEM_ADVISE_NAME,
.flags = F2FS_XATTR_INDEX_ADVISE,
.list = f2fs_xattr_advise_list,
.get = f2fs_xattr_advise_get,