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Implement IO_NOMACCHECK in vn_rdwr() -- perform MAC checks (assuming

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'options MAC') as long as IO_NOMACCHECK is not set in the IO flags.
If IO_NOMACCHECK is set, bypass MAC checks in vn_rdwr().  This allows
vn_rdwr() to be used as a utility function inside of file systems
where MAC checks have already been performed, or where the operation
is being done on behalf of the kernel not the user.

Obtained from:	TrustedBSD Project
Sponsored by:	DARPA, NAI LAbs
This commit is contained in:
Robert Watson 2002-08-12 16:15:34 +00:00
parent f46eb8f0b8
commit 0231c03df4
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=101741
1 changed files with 17 additions and 4 deletions
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21
sys/kern/vfs_vnops.c
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@ -394,10 +394,23 @@ vn_rdwr(rw, vp, base, len, offset, segflg, ioflg, cred, aresid, td)
auio.uio_segflg = segflg;
auio.uio_rw = rw;
auio.uio_td = td;
if (rw == UIO_READ)
error = VOP_READ(vp, &auio, ioflg, cred);
else
error = VOP_WRITE(vp, &auio, ioflg, cred);
error = 0;
#ifdef MAC
if ((ioflg & IO_NOMACCHECK) == 0) {
if (rw == UIO_READ)
error = mac_check_vnode_op(cred, vp,
MAC_OP_VNODE_READ);
else
error = mac_check_vnode_op(cred, vp,
MAC_OP_VNODE_WRITE);
}
#endif
if (error == 0) {
if (rw == UIO_READ)
error = VOP_READ(vp, &auio, ioflg, cred);
else
error = VOP_WRITE(vp, &auio, ioflg, cred);
}
if (aresid)
*aresid = auio.uio_resid;
else