Commit 42492594 authored by David P. Quigley's avatar David P. Quigley Committed by Linus Torvalds
Browse files

VFS/Security: Rework inode_getsecurity and callers to return resulting buffer 



This patch modifies the interface to inode_getsecurity to have the function
return a buffer containing the security blob and its length via parameters
instead of relying on the calling function to give it an appropriately sized
buffer.

Security blobs obtained with this function should be freed using the
release_secctx LSM hook.  This alleviates the problem of the caller having to
guess a length and preallocate a buffer for this function allowing it to be
used elsewhere for Labeled NFS.

The patch also removed the unused err parameter.  The conversion is similar to
the one performed by Al Viro for the security_getprocattr hook.

Signed-off-by: default avatarDavid P. Quigley <dpquigl@tycho.nsa.gov>
Cc: Stephen Smalley <sds@tycho.nsa.gov>
Cc: Chris Wright <chrisw@sous-sol.org>
Acked-by: default avatarJames Morris <jmorris@namei.org>
Acked-by: default avatarSerge Hallyn <serue@us.ibm.com>
Cc: Casey Schaufler <casey@schaufler-ca.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 37291458

fs/xattr.c

+28 −2
Original line number Diff line number Diff line
@@ -104,6 +104,33 @@ out: 
}

EXPORT_SYMBOL_GPL(vfs_setxattr);



ssize_t

xattr_getsecurity(struct inode *inode, const char *name, void *value,

			size_t size)

{

	void *buffer = NULL;

	ssize_t len;



	if (!value || !size) {

		len = security_inode_getsecurity(inode, name, &buffer, false);

		goto out_noalloc;

	}



	len = security_inode_getsecurity(inode, name, &buffer, true);

	if (len < 0)

		return len;

	if (size < len) {

		len = -ERANGE;

		goto out;

	}

	memcpy(value, buffer, len);

out:

	security_release_secctx(buffer, len);

out_noalloc:

	return len;

}

EXPORT_SYMBOL_GPL(xattr_getsecurity);



ssize_t

vfs_getxattr(struct dentry *dentry, char *name, void *value, size_t size)

{
@@ -126,8 +153,7 @@ vfs_getxattr(struct dentry *dentry, char *name, void *value, size_t size) 
	if (!strncmp(name, XATTR_SECURITY_PREFIX,

				XATTR_SECURITY_PREFIX_LEN)) {

		const char *suffix = name + XATTR_SECURITY_PREFIX_LEN;

		int ret = security_inode_getsecurity(inode, suffix, value,

						     size, error);

		int ret = xattr_getsecurity(inode, suffix, value, size);

		/*

		 * Only overwrite the return value if a security module

		 * is actually active.

include/linux/security.h

+9 −12
Original line number Diff line number Diff line
@@ -423,15 +423,12 @@ struct request_sock; 
 * 	identified by @name for @dentry.

 * 	Return 0 if permission is granted.

 * @inode_getsecurity:

 *	Copy the extended attribute representation of the security label 

 *	associated with @name for @inode into @buffer.  @buffer may be

 *	NULL to request the size of the buffer required.  @size indicates

 *	the size of @buffer in bytes.  Note that @name is the remainder

 *	of the attribute name after the security. prefix has been removed.

 *	@err is the return value from the preceding fs getxattr call,

 *	and can be used by the security module to determine whether it

 *	should try and canonicalize the attribute value.

 *	Return number of bytes used/required on success.

 *	Retrieve a copy of the extended attribute representation of the

 *	security label associated with @name for @inode via @buffer.  Note that

 *	@name is the remainder of the attribute name after the security prefix

 *	has been removed. @alloc is used to specify of the call should return a

 *	value via the buffer or just the value length Return size of buffer on

 *	success.

 * @inode_setsecurity:

 *	Set the security label associated with @name for @inode from the

 *	extended attribute value @value.  @size indicates the size of the
@@ -1304,7 +1301,7 @@ struct security_operations { 
	int (*inode_removexattr) (struct dentry *dentry, char *name);

	int (*inode_need_killpriv) (struct dentry *dentry);

	int (*inode_killpriv) (struct dentry *dentry);

  	int (*inode_getsecurity)(const struct inode *inode, const char *name, void *buffer, size_t size, int err);

	int (*inode_getsecurity)(const struct inode *inode, const char *name, void **buffer, bool alloc);

  	int (*inode_setsecurity)(struct inode *inode, const char *name, const void *value, size_t size, int flags);

  	int (*inode_listsecurity)(struct inode *inode, char *buffer, size_t buffer_size);
@@ -1565,7 +1562,7 @@ int security_inode_listxattr(struct dentry *dentry); 
int security_inode_removexattr(struct dentry *dentry, char *name);

int security_inode_need_killpriv(struct dentry *dentry);

int security_inode_killpriv(struct dentry *dentry);

int security_inode_getsecurity(const struct inode *inode, const char *name, void *buffer, size_t size, int err);

int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc);

int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags);

int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size);

int security_file_permission(struct file *file, int mask);
@@ -1967,7 +1964,7 @@ static inline int security_inode_killpriv(struct dentry *dentry) 
	return cap_inode_killpriv(dentry);

}



static inline int security_inode_getsecurity(const struct inode *inode, const char *name, void *buffer, size_t size, int err)

static inline int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc)

{

	return -EOPNOTSUPP;

}

include/linux/xattr.h

+1 −0
Original line number Diff line number Diff line
@@ -46,6 +46,7 @@ struct xattr_handler { 
		   size_t size, int flags);

};



ssize_t xattr_getsecurity(struct inode *, const char *, void *, size_t);

ssize_t vfs_getxattr(struct dentry *, char *, void *, size_t);

ssize_t vfs_listxattr(struct dentry *d, char *list, size_t size);

int vfs_setxattr(struct dentry *, char *, void *, size_t, int);

mm/shmem.c

+1 −2
Original line number Diff line number Diff line
@@ -1955,8 +1955,7 @@ static int shmem_xattr_security_get(struct inode *inode, const char *name, 
{

	if (strcmp(name, "") == 0)

		return -EINVAL;

	return security_inode_getsecurity(inode, name, buffer, size,

					  -EOPNOTSUPP);

	return xattr_getsecurity(inode, name, buffer, size);

}



static int shmem_xattr_security_set(struct inode *inode, const char *name,

security/dummy.c

+1 −1
Original line number Diff line number Diff line
@@ -402,7 +402,7 @@ static int dummy_inode_killpriv(struct dentry *dentry) 
	return 0;

}



static int dummy_inode_getsecurity(const struct inode *inode, const char *name, void *buffer, size_t size, int err)

static int dummy_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc)

{

	return -EOPNOTSUPP;

}

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