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cdevsw: add D_NONPASSABLE flag

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to make the opened device files non-passable.

Reviewed by:	markj
Tested by:	pho (previous version)
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D60285
This commit is contained in:
Konstantin Belousov committed 2026-10-06 00:56:53 +03:00
1 parent 481447ad9b
commit 850d456292
2 files changed
+27 -2
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sys/fs/devfs/devfs_vnops.c
+25 -2
View File
@@ -67,6 +67,7 @@
static struct vop_vector devfs_vnodeops;
static struct vop_vector devfs_specops;
static const struct fileops devfs_ops_f;
static const struct fileops devfs_ops_nonpassable_f;
#include <fs/devfs/devfs.h>
#include <fs/devfs/devfs_int.h>
@@ -1344,8 +1345,11 @@ devfs_open(struct vop_open_args *ap)
if (fp == NULL)
return (error);
#endif
if (fp->f_ops == &badfileops)
finit(fp, fp->f_flag, DTYPE_VNODE, dev, &devfs_ops_f);
if (fp->f_ops == &badfileops) {
finit(fp, fp->f_flag, DTYPE_VNODE, dev,
(dsw->d_flags & D_NONPASSABLE) == 0 ? &devfs_ops_f :
&devfs_ops_nonpassable_f);
}
return (error);
}
@@ -2096,6 +2100,25 @@ static const struct fileops devfs_ops_f = {
.fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE
};
static const struct fileops devfs_ops_nonpassable_f = {
.fo_read = devfs_read_f,
.fo_write = devfs_write_f,
.fo_truncate = devfs_truncate_f,
.fo_ioctl = devfs_ioctl_f,
.fo_poll = devfs_poll_f,
.fo_kqfilter = devfs_kqfilter_f,
.fo_stat = devfs_stat_f,
.fo_close = devfs_close_f,
.fo_chmod = vn_chmod,
.fo_chown = vn_chown,
.fo_sendfile = vn_sendfile,
.fo_seek = vn_seek,
.fo_fill_kinfo = vn_fill_kinfo,
.fo_mmap = devfs_mmap_f,
.fo_cmp = devfs_cmp_f,
.fo_flags = DFLAG_SEEKABLE
};
/* Vops for non-CHR vnodes in /dev. */
static struct vop_vector devfs_vnodeops = {
.vop_default = &default_vnodeops,
sys/sys/conf.h
+2
View File
@@ -177,6 +177,8 @@ typedef int dumper_hdr_t(struct dumperinfo *di, struct kerneldumpheader *kdh);
#define D_GIANTOK 0x00200000 /* suppress warning about using Giant */
#define D_NEEDGIANT 0x00400000 /* driver want Giant */
#define D_NEEDMINOR 0x00800000 /* driver uses clone_create() */
#define D_NONPASSABLE 0x01000000 /* file is not passable with
SCM_RIGHTS or fork(2) */
/*
* Version numbers.