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Move 32-bit compat support for FIODGNAME to the right place.

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ioctl(2) commands only have meaning in the context of a file descriptor
so translating them in the syscall layer is incorrect.

The new handler users an accessor to retrieve/construct a pointer from
the last member of the passed structure and relies on type punning to
access the other member which requires no translation.

Reviewed by:	kib
Approved by:	re (rgrimes, gjb)
Obtained from:	CheriBSD
Sponsored by:	DARPA, AFRL
Differential Review:	https://reviews.freebsd.org/D17388
This commit is contained in:
Brooks Davis 2018-10-03 20:39:48 +00:00
parent a669177576
commit 23f2e22802
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=339174
3 changed files with 42 additions and 34 deletions
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20
sys/compat/freebsd32/freebsd32_ioctl.c
View File

@ -58,22 +58,6 @@ __FBSDID("$FreeBSD$");
CTASSERT(sizeof(struct mem_range_op32) == 12);
static int
freebsd32_ioctl_fiodgname(struct thread *td,
struct freebsd32_ioctl_args *uap, struct file *fp)
{
struct fiodgname_arg fgn;
struct fiodgname_arg32 fgn32;
int error;
if ((error = copyin(uap->data, &fgn32, sizeof fgn32)) != 0)
return (error);
CP(fgn32, fgn, len);
PTRIN_CP(fgn32, fgn, buf);
error = fo_ioctl(fp, FIODGNAME, (caddr_t)&fgn, td->td_ucred, td);
return (error);
}
static int
freebsd32_ioctl_memrange(struct thread *td,
struct freebsd32_ioctl_args *uap, struct file *fp)
@ -237,10 +221,6 @@ freebsd32_ioctl(struct thread *td, struct freebsd32_ioctl_args *uap)
}
switch (uap->com) {
case FIODGNAME_32:
error = freebsd32_ioctl_fiodgname(td, uap, fp);
break;
case MEMRANGE_GET32: /* FALLTHROUGH */
case MEMRANGE_SET32:
error = freebsd32_ioctl_memrange(td, uap, fp);

6
sys/compat/freebsd32/freebsd32_ioctl.h
View File

@ -38,11 +38,6 @@
typedef __uint32_t caddr_t32;
struct fiodgname_arg32 {
int len;
caddr_t32 buf;
};
struct mem_range_op32
{
caddr_t32 mo_desc;
@ -60,7 +55,6 @@ struct pci_bar_mmap32 {
int pbm_memattr;
};
#define FIODGNAME_32 _IOW('f', 120, struct fiodgname_arg32)
#define MEMRANGE_GET32 _IOWR('m', 50, struct mem_range_op32)
#define MEMRANGE_SET32 _IOW('m', 51, struct mem_range_op32)
#define SG_IO_32 _IOWR(SGIOC, 0x85, struct sg_io_hdr32)

50
sys/fs/devfs/devfs_vnops.c
View File

@ -79,6 +79,14 @@ static struct fileops devfs_ops_f;
#include <vm/vm_extern.h>
#include <vm/vm_object.h>
#ifdef COMPAT_FREEBSD32
struct fiodgname_arg32 {
int len;
uint32_t buf; /* (void *) */
};
#define FIODGNAME_32 _IOC_NEWTYPE(FIODGNAME, struct fiodgname_arg32)
#endif
static MALLOC_DEFINE(M_CDEVPDATA, "DEVFSP", "Metainfo for cdev-fp data");
struct mtx devfs_de_interlock;
@ -767,6 +775,29 @@ devfs_ioctl_f(struct file *fp, u_long com, void *data, struct ucred *cred, struc
return (error);
}
static void *
fiodgname_buf_get_ptr(void *fgnp, u_long com)
{
union {
struct fiodgname_arg fgn;
#ifdef COMPAT_FREEBSD32
struct fiodgname_arg32 fgn32;
#endif
} *fgnup;
fgnup = fgnp;
switch (com) {
case FIODGNAME:
return (fgnup->fgn.buf);
#ifdef COMPAT_FREEBSD32
case FIODGNAME_32:
return ((void *)(uintptr_t)fgnup->fgn32.buf);
#endif
default:
panic("Unhandled ioctl command %ld", com);
}
}
static int
devfs_ioctl(struct vop_ioctl_args *ap)
{
@ -789,24 +820,27 @@ devfs_ioctl(struct vop_ioctl_args *ap)
KASSERT(dev->si_refcount > 0,
("devfs: un-referenced struct cdev *(%s)", devtoname(dev)));
if (com == FIODTYPE) {
switch (com) {
case FIODTYPE:
*(int *)ap->a_data = dsw->d_flags & D_TYPEMASK;
error = 0;
goto out;
} else if (com == FIODGNAME) {
break;
case FIODGNAME:
#ifdef COMPAT_FREEBSD32
case FIODGNAME_32:
#endif
fgn = ap->a_data;
p = devtoname(dev);
i = strlen(p) + 1;
if (i > fgn->len)
error = EINVAL;
else
error = copyout(p, fgn->buf, i);
goto out;
error = copyout(p, fiodgname_buf_get_ptr(fgn, com), i);
break;
default:
error = dsw->d_ioctl(dev, com, ap->a_data, ap->a_fflag, td);
}
error = dsw->d_ioctl(dev, com, ap->a_data, ap->a_fflag, td);
out:
dev_relthread(dev, ref);
if (error == ENOIOCTL)
error = ENOTTY;