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Acquire Giant explicitly in fhopen(), fhstat(), and kern_fhstatfs(),

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so that we can start to eliminate the presence of non-MPSAFE system
call entries in syscalls.master.
This commit is contained in:
Robert Watson 2005-05-28 12:58:54 +00:00
parent 20ef0ca2b3
commit f73e1f57cf
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=146709
2 changed files with 72 additions and 20 deletions
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46
sys/kern/vfs_extattr.c
View file

@ -3951,6 +3951,8 @@ getfh(td, uap)
*
* warning: do not remove the suser() call or this becomes one giant
* security hole.
*
* MP SAFE
*/
#ifndef _SYS_SYSPROTO_H_
struct fhopen_args {
@ -3990,13 +3992,16 @@ fhopen(td, uap)
if (error)
return(error);
/* find the mount point */
mtx_lock(&Giant);
mp = vfs_getvfs(&fhp.fh_fsid);
if (mp == NULL)
return (ESTALE);
if (mp == NULL) {
error = ESTALE;
goto out;
}
/* now give me my vnode, it gets returned to me locked */
error = VFS_FHTOVP(mp, &fhp.fh_fid, &vp);
if (error)
return (error);
goto out;
/*
* from now on we have to make sure not
* to forget about the vnode
@ -4044,7 +4049,7 @@ fhopen(td, uap)
VOP_UNLOCK(vp, 0, td); /* XXX */
if ((error = vn_start_write(NULL, &mp, V_WAIT | PCATCH)) != 0) {
vrele(vp);
return (error);
goto out;
}
VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); /* XXX */
@ -4115,7 +4120,7 @@ fhopen(td, uap)
* release our private reference
*/
fdrop(fp, td);
return(error);
goto out;
}
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
fp->f_flag |= FHASLOCK;
@ -4123,16 +4128,21 @@ fhopen(td, uap)
VOP_UNLOCK(vp, 0, td);
fdrop(fp, td);
mtx_unlock(&Giant);
td->td_retval[0] = indx;
return (0);
bad:
vput(vp);
out:
mtx_unlock(&Giant);
return (error);
}
/*
* Stat an (NFS) file handle.
*
* MP SAFE
*/
#ifndef _SYS_SYSPROTO_H_
struct fhstat_args {
@ -4160,12 +4170,18 @@ fhstat(td, uap)
error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
if (error)
return (error);
if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL)
mtx_lock(&Giant);
if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) {
mtx_unlock(&Giant);
return (ESTALE);
if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)))
}
if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) {
mtx_unlock(&Giant);
return (error);
}
error = vn_stat(vp, &sb, td->td_ucred, NOCRED, td);
vput(vp);
mtx_unlock(&Giant);
if (error)
return (error);
error = copyout(&sb, uap->sb, sizeof(sb));
@ -4174,6 +4190,8 @@ fhstat(td, uap)
/*
* Implement fstatfs() for (NFS) file handles.
*
* MP SAFE
*/
#ifndef _SYS_SYSPROTO_H_
struct fhstatfs_args {
@ -4213,18 +4231,25 @@ kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf)
error = suser(td);
if (error)
return (error);
if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL)
mtx_lock(&Giant);
if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) {
mtx_unlock(&Giant);
return (ESTALE);
}
error = VFS_FHTOVP(mp, &fh.fh_fid, &vp);
if (error)
if (error) {
mtx_unlock(&Giant);
return (error);
}
mp = vp->v_mount;
sp = &mp->mnt_stat;
vput(vp);
#ifdef MAC
error = mac_check_mount_stat(td->td_ucred, mp);
if (error)
if (error) {
mtx_unlock(&Giant);
return (error);
}
#endif
/*
* Set these in case the underlying filesystem fails to do so.
@ -4233,6 +4258,7 @@ kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf)
sp->f_namemax = NAME_MAX;
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
error = VFS_STATFS(mp, sp, td);
mtx_unlock(&Giant);
if (error)
return (error);
*buf = *sp;

46
sys/kern/vfs_syscalls.c
View file

@ -3951,6 +3951,8 @@ getfh(td, uap)
*
* warning: do not remove the suser() call or this becomes one giant
* security hole.
*
* MP SAFE
*/
#ifndef _SYS_SYSPROTO_H_
struct fhopen_args {
@ -3990,13 +3992,16 @@ fhopen(td, uap)
if (error)
return(error);
/* find the mount point */
mtx_lock(&Giant);
mp = vfs_getvfs(&fhp.fh_fsid);
if (mp == NULL)
return (ESTALE);
if (mp == NULL) {
error = ESTALE;
goto out;
}
/* now give me my vnode, it gets returned to me locked */
error = VFS_FHTOVP(mp, &fhp.fh_fid, &vp);
if (error)
return (error);
goto out;
/*
* from now on we have to make sure not
* to forget about the vnode
@ -4044,7 +4049,7 @@ fhopen(td, uap)
VOP_UNLOCK(vp, 0, td); /* XXX */
if ((error = vn_start_write(NULL, &mp, V_WAIT | PCATCH)) != 0) {
vrele(vp);
return (error);
goto out;
}
VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); /* XXX */
@ -4115,7 +4120,7 @@ fhopen(td, uap)
* release our private reference
*/
fdrop(fp, td);
return(error);
goto out;
}
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
fp->f_flag |= FHASLOCK;
@ -4123,16 +4128,21 @@ fhopen(td, uap)
VOP_UNLOCK(vp, 0, td);
fdrop(fp, td);
mtx_unlock(&Giant);
td->td_retval[0] = indx;
return (0);
bad:
vput(vp);
out:
mtx_unlock(&Giant);
return (error);
}
/*
* Stat an (NFS) file handle.
*
* MP SAFE
*/
#ifndef _SYS_SYSPROTO_H_
struct fhstat_args {
@ -4160,12 +4170,18 @@ fhstat(td, uap)
error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
if (error)
return (error);
if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL)
mtx_lock(&Giant);
if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) {
mtx_unlock(&Giant);
return (ESTALE);
if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)))
}
if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) {
mtx_unlock(&Giant);
return (error);
}
error = vn_stat(vp, &sb, td->td_ucred, NOCRED, td);
vput(vp);
mtx_unlock(&Giant);
if (error)
return (error);
error = copyout(&sb, uap->sb, sizeof(sb));
@ -4174,6 +4190,8 @@ fhstat(td, uap)
/*
* Implement fstatfs() for (NFS) file handles.
*
* MP SAFE
*/
#ifndef _SYS_SYSPROTO_H_
struct fhstatfs_args {
@ -4213,18 +4231,25 @@ kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf)
error = suser(td);
if (error)
return (error);
if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL)
mtx_lock(&Giant);
if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) {
mtx_unlock(&Giant);
return (ESTALE);
}
error = VFS_FHTOVP(mp, &fh.fh_fid, &vp);
if (error)
if (error) {
mtx_unlock(&Giant);
return (error);
}
mp = vp->v_mount;
sp = &mp->mnt_stat;
vput(vp);
#ifdef MAC
error = mac_check_mount_stat(td->td_ucred, mp);
if (error)
if (error) {
mtx_unlock(&Giant);
return (error);
}
#endif
/*
* Set these in case the underlying filesystem fails to do so.
@ -4233,6 +4258,7 @@ kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf)
sp->f_namemax = NAME_MAX;
sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
error = VFS_STATFS(mp, sp, td);
mtx_unlock(&Giant);
if (error)
return (error);
*buf = *sp;