| 1 | |
| 2 | |
| 3 | * linux/fs/ext4/xattr_security.c
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| 4 | * Handler for storing security labels as extended attributes.
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| 5 |
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| 6 |
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| 7 | #include <linux/string.h>
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| 8 | #include <linux/fs.h>
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| 9 | #include <linux/security.h>
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| 10 | #include <linux/slab.h>
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| 11 | #include "ext4_jbd2.h"
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| 12 | #include "ext4.h"
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| 13 | #include "xattr.h"
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| 14 |
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| 15 | static int
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| 16 | ext4_xattr_security_get(const struct xattr_handler *handler,
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| 17 | struct dentry *unused, struct inode *inode,
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| 18 | const char *name, void *buffer, size_t size)
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| 19 | {
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| 20 | return ext4_xattr_get(inode, EXT4_XATTR_INDEX_SECURITY,
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| 21 | name, buffer, size);
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| 22 | }
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| 23 |
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| 24 | static int
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| 25 | ext4_xattr_security_set(const struct xattr_handler *handler,
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| 26 | const struct mnt_idmap *idmap,
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| 27 | struct dentry *unused, struct inode *inode,
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| 28 | const char *name, const void *value,
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| 29 | size_t size, int flags)
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| 30 | {
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| 31 | return ext4_xattr_set(inode, EXT4_XATTR_INDEX_SECURITY,
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| 32 | name, value, size, flags);
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| 33 | }
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| 34 |
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| 35 | static int
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| 36 | ext4_initxattrs(struct inode *inode, const struct xattr *xattr_array,
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| 37 | void *fs_info)
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| 38 | {
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| 39 | const struct xattr *xattr;
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| 40 | handle_t *handle = fs_info;
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| 41 | int err = 0;
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| 42 |
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| 43 | for (xattr = xattr_array; xattr->name != NULL; xattr++) {
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| 44 | err = ext4_xattr_set_handle(handle, inode,
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| 45 | EXT4_XATTR_INDEX_SECURITY,
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| 46 | xattr->name, xattr->value,
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| 47 | xattr->value_len, XATTR_CREATE);
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| 48 | if (err < 0)
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| 49 | break;
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| 50 | }
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| 51 | return err;
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| 52 | }
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| 53 |
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| 54 | int
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| 55 | ext4_init_security(handle_t *handle, struct inode *inode, struct inode *dir,
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| 56 | const struct qstr *qstr)
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| 57 | {
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| 58 | return security_inode_init_security(inode, dir, qstr,
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| 59 | &ext4_initxattrs, handle);
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| 60 | }
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| 61 |
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| 62 | const struct xattr_handler ext4_xattr_security_handler = {
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| 63 | .prefix = XATTR_SECURITY_PREFIX,
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| 64 | .get = ext4_xattr_security_get,
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| 65 | .set = ext4_xattr_security_set,
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| 66 | };
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