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OS-3925 lxbrand in-kernel link(2) and linkat(2)
OS-5094 lxbrand link to symlink failure Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| /* | ||
| * This file and its contents are supplied under the terms of the | ||
| * Common Development and Distribution License ("CDDL"), version 1.0. | ||
| * You may only use this file in accordance with the terms of version | ||
| * 1.0 of the CDDL. | ||
| * | ||
| * A full copy of the text of the CDDL should have accompanied this | ||
| * source. A copy of the CDDL is also available via the Internet at | ||
| * http://www.illumos.org/license/CDDL. | ||
| */ | ||
|
|
||
| /* | ||
| * Copyright 2016 Joyent, Inc. | ||
| */ | ||
|
|
||
| #include <sys/fcntl.h> | ||
| #include <sys/errno.h> | ||
| #include <sys/file.h> | ||
| #include <sys/vnode.h> | ||
| #include <sys/systm.h> | ||
| #include <sys/lx_fcntl.h> | ||
|
|
||
| #define LX_LINK_ALLOWED (LX_AT_SYMLINK_FOLLOW | LX_AT_EMPTY_PATH) | ||
|
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| static long | ||
| lx_link_common(int ffd, char *from, int tfd, char *to, int flags) | ||
| { | ||
| int error; | ||
| vnode_t *fsvp = NULL, *tsvp = NULL; | ||
| enum symfollow follow = NO_FOLLOW; | ||
|
|
||
| if ((flags & ~LX_LINK_ALLOWED) != 0) { | ||
| return (set_errno(EINVAL)); | ||
| } | ||
| if ((flags & LX_AT_EMPTY_PATH) == 0) { | ||
| char c; | ||
|
|
||
| /* | ||
| * Check that both 'from' and 'to' names are non-empty if | ||
| * AT_EMPTY_PATH is not set. | ||
| */ | ||
| if (copyin(from, &c, sizeof (c)) != 0) { | ||
| return (set_errno(EFAULT)); | ||
| } else if (c == '\0') { | ||
| return (set_errno(ENOENT)); | ||
| } | ||
| if (copyin(to, &c, sizeof (c)) != 0) { | ||
| return (set_errno(EFAULT)); | ||
| } else if (c == '\0') { | ||
| return (set_errno(ENOENT)); | ||
| } | ||
|
|
||
| /* | ||
| * XXX: When our support for LX capabilities improves, ENOENT | ||
| * should be thrown when a process lacking CAP_DAC_READ_SEARCH | ||
| * attempts to use the AT_EMPTY_PATH flag. | ||
| */ | ||
| } | ||
| if ((flags & LX_AT_SYMLINK_FOLLOW) != 0) { | ||
| follow = FOLLOW; | ||
| } | ||
|
|
||
| if ((error = fgetstartvp(ffd, from, &fsvp)) != 0) { | ||
| goto out; | ||
| } | ||
| if ((error = fgetstartvp(tfd, to, &tsvp)) != 0) { | ||
| goto out; | ||
| } | ||
| error = vn_linkat(fsvp, from, follow, tsvp, to, UIO_USERSPACE); | ||
|
|
||
| out: | ||
| if (fsvp != NULL) { | ||
| VN_RELE(fsvp); | ||
| } | ||
| if (tsvp != NULL) { | ||
| VN_RELE(tsvp); | ||
| } | ||
| if (error) { | ||
| return (set_errno(error)); | ||
| } | ||
| return (0); | ||
| } | ||
|
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||
| long | ||
| lx_link(char *from, char *to) | ||
| { | ||
| return (lx_link_common(AT_FDCWD, from, AT_FDCWD, to, 0)); | ||
| } | ||
|
|
||
| long | ||
| lx_linkat(int ffd, char *from, int tfd, char *to, int flags) | ||
| { | ||
| ffd = (ffd == LX_AT_FDCWD) ? AT_FDCWD : ffd; | ||
| tfd = (tfd == LX_AT_FDCWD) ? AT_FDCWD : tfd; | ||
|
|
||
| return (lx_link_common(ffd, from, tfd, to, flags)); | ||
| } |
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