#include <sys/cdefs.h>
#include "opt_capsicum.h"
#include "opt_ktrace.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/dirent.h>
#include <sys/kernel.h>
#include <sys/capsicum.h>
#include <sys/fcntl.h>
#include <sys/jail.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/filedesc.h>
#include <sys/proc.h>
#include <sys/sdt.h>
#include <sys/syscallsubr.h>
#include <sys/sysctl.h>
#include <security/audit/audit.h>
#include <security/mac/mac_framework.h>
#include <vm/uma.h>

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Data Structures
struct	nameicap_tracker

Macros
#define	NAMEI_DIAGNOSTIC 1

Functions
	__FBSDID ("$FreeBSD$")

	SDT_PROVIDER_DEFINE (vfs)

	SDT_PROBE_DEFINE4 (vfs, namei, lookup, entry, "struct vnode ", "char ", "unsigned long", "bool")

	SDT_PROBE_DEFINE4 (vfs, namei, lookup, return, "int", "struct vnode *", "bool", "struct nameidata")

static int	crossmp_vop_islocked (struct vop_islocked_args *ap)

static int	crossmp_vop_lock1 (struct vop_lock1_args *ap)

static int	crossmp_vop_unlock (struct vop_unlock_args *ap)

	MALLOC_DEFINE (M_NAMEITRACKER, "namei_tracker", "namei tracking for dotdot")

static void	nameiinit (void *dummy __unused)

	SYSINIT (vfs, SI_SUB_VFS, SI_ORDER_SECOND, nameiinit, NULL)

	SYSCTL_INT (_vfs, OID_AUTO, lookup_cap_dotdot, CTLFLAG_RWTUN, &lookup_cap_dotdot, 0, "enables \"..\" components in path lookup in capability mode")

	SYSCTL_INT (_vfs, OID_AUTO, lookup_cap_dotdot_nonlocal, CTLFLAG_RWTUN, &lookup_cap_dotdot_nonlocal, 0, "enables \"..\" components in path lookup in capability mode " "on non-local mount")

static void	nameicap_tracker_add (struct nameidata ndp, struct vnode dp)

static void	nameicap_cleanup_from (struct nameidata ndp, struct nameicap_tracker first)

static void	nameicap_cleanup (struct nameidata *ndp)

static int	nameicap_check_dotdot (struct nameidata ndp, struct vnode dp)

static void	namei_cleanup_cnp (struct componentname *cnp)

static int	namei_handle_root (struct nameidata ndp, struct vnode *dpp)

static int	namei_setup (struct nameidata ndp, struct vnode dpp, struct pwd *pwdp)

static int	namei_getpath (struct nameidata *ndp)

static int	namei_emptypath (struct nameidata *ndp)

int	namei (struct nameidata *ndp)

static int	compute_cn_lkflags (struct mount *mp, int lkflags, int cnflags)

static __inline int	needs_exclusive_leaf (struct mount *mp, int flags)

	_Static_assert (MAXNAMLEN==NAME_MAX, "MAXNAMLEN and NAME_MAX have different values")

int	vfs_lookup (struct nameidata *ndp)

int	vfs_relookup (struct vnode dvp, struct vnode vpp, struct componentname cnp)

void	NDFREE_PNBUF (struct nameidata *ndp)

void()	NDFREE (struct nameidata *ndp, const u_int flags)

int	kern_alternate_path (const char prefix, const char path, enum uio_seg pathseg, char **pathbuf, int create, int dirfd)

Variables
uma_zone_t	namei_zone

static struct vnode *	vp_crossmp

static struct vop_vector	crossmp_vnodeops

static int	lookup_cap_dotdot = 1

static int	lookup_cap_dotdot_nonlocal = 1

Macro Definition Documentation

◆ NAMEI_DIAGNOSTIC

#define NAMEI_DIAGNOSTIC 1

Definition at line 74 of file vfs_lookup.c.

Function Documentation

◆ __FBSDID()

__FBSDID ( "$FreeBSD$" )

◆ _Static_assert()

_Static_assert	(	MAXNAMLEN	= `=NAME_MAX`,
		"MAXNAMLEN and NAME_MAX have different values"
	)

◆ compute_cn_lkflags()

static int compute_cn_lkflags	(	struct mount *	mp,
		int	lkflags,
		int	cnflags
	)

static

Definition at line 755 of file vfs_lookup.c.

Referenced by vfs_lookup().

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◆ crossmp_vop_islocked()

static int crossmp_vop_islocked ( struct vop_islocked_args * ap )

static

Definition at line 90 of file vfs_lookup.c.

◆ crossmp_vop_lock1()

static int crossmp_vop_lock1 ( struct vop_lock1_args * ap )

static

Definition at line 97 of file vfs_lookup.c.

References flags, and panic().

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◆ crossmp_vop_unlock()

static int crossmp_vop_unlock ( struct vop_unlock_args * ap )

static

Definition at line 123 of file vfs_lookup.c.

◆ kern_alternate_path()

int kern_alternate_path	(	const char *	prefix,
		const char *	path,
		enum uio_seg	pathseg,
		char **	pathbuf,
		int	create,
		int	dirfd
	)

Definition at line 1674 of file vfs_lookup.c.

References buf, dirfd, free(), malloc(), namei(), NDFREE(), path, and vrele().

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◆ MALLOC_DEFINE()

MALLOC_DEFINE	(	M_NAMEITRACKER	,
		"namei_tracker"	,
		"namei tracking for dotdot"
	)

◆ namei()

int namei ( struct nameidata * ndp )

Definition at line 535 of file vfs_lookup.c.

References cache_fplookup(), namei(), namei_cleanup_cnp(), namei_emptypath(), namei_getpath(), namei_handle_root(), namei_setup(), namei_zone, nameicap_cleanup(), pwd_drop(), vfs_lookup(), vput(), and vrele().

Referenced by cache_fplookup(), do_execve(), kern___acl_aclcheck_path(), kern___acl_delete_path(), kern___acl_get_path(), kern___acl_set_path(), kern___realpathat(), kern_accessat(), kern_alternate_path(), kern_chdir(), kern_chflagsat(), kern_extattr_delete_path(), kern_extattr_get_path(), kern_extattr_list_path(), kern_extattr_set_path(), kern_fchmodat(), kern_fchownat(), kern_frmdirat(), kern_funlinkat(), kern_getfhat(), kern_jail_set(), kern_linkat(), kern_linkat_vp(), kern_lutimes(), kern_mkdirat(), kern_mkfifoat(), kern_mknodat(), kern_pathconf(), kern_readlinkat(), kern_renameat(), kern_statat(), kern_statfs(), kern_symlinkat(), kern_truncate(), kern_unmount(), kern_utimensat(), kern_utimesat(), load_file(), namei(), namei_emptypath(), namei_setup(), parse_mount_dev_present(), proc_get_binpath(), sys_chroot(), sys_extattrctl(), sys_quotactl(), sys_revoke(), sys_undelete(), sysctl_debug_tslog_user(), sysctl_try_reclaim_vnode(), tslog_user(), uipc_bindat(), unp_connectat(), vfs_domount(), vfs_mountroot_shuffle(), vn_open_cred(), and vn_path_to_global_path().

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◆ namei_cleanup_cnp()

static void namei_cleanup_cnp ( struct componentname * cnp )

static

Definition at line 253 of file vfs_lookup.c.

References namei_zone.

Referenced by namei(), and namei_emptypath().

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◆ namei_emptypath()

static int namei_emptypath ( struct nameidata * ndp )

static

Definition at line 471 of file vfs_lookup.c.

References namei(), namei_cleanup_cnp(), namei_setup(), pwd_drop(), and vput().

Referenced by namei().

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◆ namei_getpath()

static int namei_getpath ( struct nameidata * ndp )

static

Definition at line 443 of file vfs_lookup.c.

References namei_zone.

Referenced by namei().

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◆ namei_handle_root()

static int namei_handle_root	(	struct nameidata *	ndp,
		struct vnode **	dpp
	)

static

Definition at line 264 of file vfs_lookup.c.

References vrefact().

Referenced by namei(), and namei_setup().

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◆ namei_setup()

static int namei_setup	(	struct nameidata *	ndp,
		struct vnode **	dpp,
		struct pwd **	pwdp
	)

static

Definition at line 286 of file vfs_lookup.c.

References badfileops, fget_cap(), lookup_cap_dotdot, namei(), namei_handle_root(), pwd_drop(), pwd_hold(), vref(), vrefact(), and vrele().

Referenced by namei(), and namei_emptypath().

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◆ nameicap_check_dotdot()

static int nameicap_check_dotdot	(	struct nameidata *	ndp,
		struct vnode *	dp
	)

static

Definition at line 226 of file vfs_lookup.c.

References nameicap_tracker::dp, lookup_cap_dotdot_nonlocal, and nameicap_cleanup_from().

Referenced by vfs_lookup().

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◆ nameicap_cleanup()

static void nameicap_cleanup ( struct nameidata * ndp )

static

Definition at line 207 of file vfs_lookup.c.

References nameicap_cleanup_from().

Referenced by namei().

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◆ nameicap_cleanup_from()

static void nameicap_cleanup_from	(	struct nameidata *	ndp,
		struct nameicap_tracker *	first
	)

static

Definition at line 194 of file vfs_lookup.c.

References nameicap_tracker::dp, free(), and vdrop().

Referenced by nameicap_check_dotdot(), and nameicap_cleanup().

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◆ nameicap_tracker_add()

static void nameicap_tracker_add	(	struct nameidata *	ndp,
		struct vnode *	dp
	)

static

Definition at line 178 of file vfs_lookup.c.

References nameicap_tracker::dp, malloc(), and vhold().

Referenced by vfs_lookup().

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◆ nameiinit()

static void nameiinit ( void *dummy __unused )

static

Definition at line 157 of file vfs_lookup.c.

References crossmp_vnodeops, getnewvnode(), namei_zone, and vp_crossmp.

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◆ NDFREE()

void() NDFREE	(	struct nameidata *	ndp,
		const u_int	flags
	)

Definition at line 1554 of file vfs_lookup.c.

References flags, NDFREE_PNBUF(), vput(), and vrele().

Referenced by alq_open_flags(), corefile_open(), corefile_open_last(), do_execve(), kern___acl_aclcheck_path(), kern___acl_delete_path(), kern___acl_get_path(), kern___acl_set_path(), kern___realpathat(), kern_alternate_path(), kern_extattr_delete_path(), kern_extattr_get_path(), kern_extattr_list_path(), kern_extattr_set_path(), kern_frmdirat(), kern_funlinkat(), kern_jail_set(), kern_linkat(), kern_linkat_vp(), kern_mkdirat(), kern_mkfifoat(), kern_mknodat(), kern_openat(), kern_renameat(), kern_symlinkat(), kern_truncate(), kern_unmount(), link_elf_ctf_get(), link_elf_load_file(), linker_hints_lookup(), linker_lookup_file(), load_file(), parse_mount_dev_present(), proc_get_binpath(), sys_acct(), sys_extattrctl(), sys_ktrace(), sys_quotactl(), sys_undelete(), sysctl_try_reclaim_vnode(), uipc_bindat(), vfs_domount(), vfs_lookup(), vfs_mountroot_readconf(), vfs_mountroot_shuffle(), vn_open_cred(), vn_path_to_global_path(), and vop_stdvptocnp().

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◆ NDFREE_PNBUF()

void NDFREE_PNBUF ( struct nameidata * ndp )

Definition at line 1517 of file vfs_lookup.c.

References namei_zone.

Referenced by NDFREE().

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◆ needs_exclusive_leaf()

static __inline int needs_exclusive_leaf	(	struct mount *	mp,
		int	flags
	)

static

Definition at line 768 of file vfs_lookup.c.

References flags.

Referenced by vfs_lookup().

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◆ SDT_PROBE_DEFINE4() [1/2]

SDT_PROBE_DEFINE4	(	vfs	,
		namei	,
		lookup	,
		entry	,
		"struct vnode *"	,
		"char *"	,
		"unsigned long"	,
		"bool"
	)

◆ SDT_PROBE_DEFINE4() [2/2]

SDT_PROBE_DEFINE4	(	vfs	,
		namei	,
		lookup	,
		return	,
		"int"	,
		"struct vnode *"	,
		"bool"	,
		"struct nameidata"
	)

◆ SDT_PROVIDER_DEFINE()

SDT_PROVIDER_DEFINE ( vfs )

◆ SYSCTL_INT() [1/2]

SYSCTL_INT	(	_vfs	,
		OID_AUTO	,
		lookup_cap_dotdot	,
		CTLFLAG_RWTUN	,
		&	lookup_cap_dotdot,
		0	,
		"enables \"..\" components in path lookup in capability mode"
	)

◆ SYSCTL_INT() [2/2]

SYSCTL_INT	(	_vfs	,
		OID_AUTO	,
		lookup_cap_dotdot_nonlocal	,
		CTLFLAG_RWTUN	,
		&	lookup_cap_dotdot_nonlocal,
		0	,
		"enables \"..\" components in path lookup in capability mode " "on non-local mount"
	)

◆ SYSINIT()

SYSINIT	(	vfs	,
		SI_SUB_VFS	,
		SI_ORDER_SECOND	,
		nameiinit	,
		NULL
	)

◆ vfs_lookup()

int vfs_lookup ( struct nameidata * ndp )

Definition at line 844 of file vfs_lookup.c.

References compute_cn_lkflags(), nameicap_check_dotdot(), nameicap_tracker_add(), NDFREE(), needs_exclusive_leaf(), panic(), pr, printf(), rootvnode, vfs_busy(), vfs_unbusy(), vn_printf(), vp_crossmp, vput(), vref(), vrefact(), and vrele().

Referenced by namei().

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◆ vfs_relookup()

int vfs_relookup	(	struct vnode *	dvp,
		struct vnode **	vpp,
		struct componentname *	cnp
	)

Definition at line 1389 of file vfs_lookup.c.

References panic(), printf(), vn_printf(), vput(), and vrele().

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Variable Documentation

◆ crossmp_vnodeops

struct vop_vector crossmp_vnodeops

static

Initial value:

= {
        .vop_default =          &default_vnodeops,
        .vop_islocked =         crossmp_vop_islocked,
        .vop_lock1 =            crossmp_vop_lock1,
        .vop_unlock =           crossmp_vop_unlock,
}

Definition at line 137 of file vfs_lookup.c.

Referenced by nameiinit().

◆ lookup_cap_dotdot

int lookup_cap_dotdot = 1

static

Definition at line 167 of file vfs_lookup.c.

Referenced by namei_setup().

◆ lookup_cap_dotdot_nonlocal

int lookup_cap_dotdot_nonlocal = 1

static

Definition at line 171 of file vfs_lookup.c.

Referenced by nameicap_check_dotdot().

◆ namei_zone

uma_zone_t namei_zone

Definition at line 84 of file vfs_lookup.c.

Referenced by cache_fpl_cleanup_cnp(), kern_symlinkat(), namei(), namei_cleanup_cnp(), namei_getpath(), nameiinit(), NDFREE_PNBUF(), and sys___getcwd().

◆ vp_crossmp

struct vnode* vp_crossmp

static

Definition at line 87 of file vfs_lookup.c.

Referenced by nameiinit(), and vfs_lookup().

Data Structures

Macros

Functions

Variables

Macro Definition Documentation

◆ NAMEI_DIAGNOSTIC

Function Documentation

◆ __FBSDID()

◆ _Static_assert()

◆ compute_cn_lkflags()

◆ crossmp_vop_islocked()

◆ crossmp_vop_lock1()

◆ crossmp_vop_unlock()

◆ kern_alternate_path()

◆ MALLOC_DEFINE()

◆ namei()

◆ namei_cleanup_cnp()

◆ namei_emptypath()

◆ namei_getpath()

◆ namei_handle_root()

◆ namei_setup()

◆ nameicap_check_dotdot()

◆ nameicap_cleanup()

◆ nameicap_cleanup_from()

◆ nameicap_tracker_add()

◆ nameiinit()

◆ NDFREE()

◆ NDFREE_PNBUF()

◆ needs_exclusive_leaf()

◆ SDT_PROBE_DEFINE4() [1/2]

◆ SDT_PROBE_DEFINE4() [2/2]

◆ SDT_PROVIDER_DEFINE()

◆ SYSCTL_INT() [1/2]

◆ SYSCTL_INT() [2/2]

◆ SYSINIT()

◆ vfs_lookup()

◆ vfs_relookup()

Variable Documentation

◆ crossmp_vnodeops

◆ lookup_cap_dotdot

◆ lookup_cap_dotdot_nonlocal

◆ namei_zone

◆ vp_crossmp