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Reject F_SETLK_REMOTE commands when sysid == 0.

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A sysid of 0 denotes the local system, and some handlers for remote
locking commands do not attempt to deal with local locks.  Note that
F_SETLK_REMOTE is only available to privileged users as it is intended
to be used as a testing interface.

Reviewed by:	kib
Reported by:	syzbot+9c457a6ae014a3281eb8@syzkaller.appspotmail.com
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D19702
This commit is contained in:
Mark Johnston 2019-03-25 21:38:58 +00:00
parent 4f6714d53b
commit fd76e780a7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=345513
1 changed files with 7 additions and 6 deletions
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13
sys/kern/kern_descrip.c
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@ -601,7 +601,7 @@ kern_fcntl(struct thread *td, int fd, int cmd, intptr_t arg)
case F_SETLK_REMOTE:
error = priv_check(td, PRIV_NFS_LOCKD);
if (error)
if (error != 0)
return (error);
flg = F_REMOTE;
goto do_setlk;
@ -612,6 +612,12 @@ kern_fcntl(struct thread *td, int fd, int cmd, intptr_t arg)
case F_SETLK:
do_setlk:
flp = (struct flock *)arg;
if ((flg & F_REMOTE) != 0 && flp->l_sysid == 0) {
error = EINVAL;
break;
}
error = fget_unlocked(fdp, fd, &cap_flock_rights, &fp, NULL);
if (error != 0)
break;
@ -621,7 +627,6 @@ kern_fcntl(struct thread *td, int fd, int cmd, intptr_t arg)
break;
}
flp = (struct flock *)arg;
if (flp->l_whence == SEEK_CUR) {
foffset = foffset_get(fp);
if (foffset < 0 ||
@ -667,10 +672,6 @@ kern_fcntl(struct thread *td, int fd, int cmd, intptr_t arg)
flp, flg);
break;
case F_UNLCKSYS:
/*
* Temporary api for testing remote lock
* infrastructure.
*/
if (flg != F_REMOTE) {
error = EINVAL;
break;