[PATCH 3/7] d_path: Use struct path in struct avc_audit_data

From: Jan Blunck
Date: Thu Nov 01 2007 - 17:38:23 EST

audit_log_d_path() is a d_path() wrapper that is used by the audit code. To
use a struct path in audit_log_d_path() I need to embed it into struct
avc_audit_data.

Signed-off-by: Jan Blunck <jblunck@xxxxxxx>
---
include/linux/audit.h | 5 ++---
kernel/audit.c | 12 ++++++------
kernel/auditsc.c | 28 +++++++++++-----------------
security/selinux/avc.c | 13 ++++++++-----
security/selinux/hooks.c | 28 ++++++++++++----------------
security/selinux/include/avc.h | 6 ++----
6 files changed, 41 insertions(+), 51 deletions(-)

Index: b/include/linux/audit.h
===================================================================
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -527,8 +527,7 @@ extern const char * audit_log_n_untr
const char *string);
extern void audit_log_d_path(struct audit_buffer *ab,
const char *prefix,
- struct dentry *dentry,
- struct vfsmount *vfsmnt);
+ struct path *path);
extern void audit_log_lost(const char *message);
/* Private API (for audit.c only) */
extern int audit_filter_user(struct netlink_skb_parms *cb, int type);
@@ -545,7 +544,7 @@ extern int audit_enabled;
#define audit_log_hex(a,b,l) do { ; } while (0)
#define audit_log_untrustedstring(a,s) do { ; } while (0)
#define audit_log_n_untrustedstring(a,n,s) do { ; } while (0)
-#define audit_log_d_path(b,p,d,v) do { ; } while (0)
+#define audit_log_d_path(b,p,d) do { ; } while (0)
#define audit_enabled 0
#endif
#endif
Index: b/kernel/audit.c
===================================================================
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1394,26 +1394,26 @@ const char *audit_log_untrustedstring(st

/* This is a helper-function to print the escaped d_path */
void audit_log_d_path(struct audit_buffer *ab, const char *prefix,
- struct dentry *dentry, struct vfsmount *vfsmnt)
+ struct path *path)
{
- char *p, *path;
+ char *p, *pathname;

if (prefix)
audit_log_format(ab, " %s", prefix);

/* We will allow 11 spaces for ' (deleted)' to be appended */
- path = kmalloc(PATH_MAX+11, ab->gfp_mask);
- if (!path) {
+ pathname = kmalloc(PATH_MAX+11, ab->gfp_mask);
+ if (!pathname) {
audit_log_format(ab, "<no memory>");
return;
}
- p = d_path(dentry, vfsmnt, path, PATH_MAX+11);
+ p = d_path(path->dentry, path->mnt, pathname, PATH_MAX+11);
if (IS_ERR(p)) { /* Should never happen since we send PATH_MAX */
/* FIXME: can we save some information here? */
audit_log_format(ab, "<too long>");
} else
audit_log_untrustedstring(ab, p);
- kfree(path);
+ kfree(pathname);
}

/**
Index: b/kernel/auditsc.c
===================================================================
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -201,8 +201,7 @@ struct audit_context {
int name_count;
struct audit_names names[AUDIT_NAMES];
char * filterkey; /* key for rule that triggered record */
- struct dentry * pwd;
- struct vfsmount * pwdmnt;
+ struct path pwd;
struct audit_context *previous; /* For nested syscalls */
struct audit_aux_data *aux;
struct audit_aux_data *aux_pids;
@@ -758,12 +757,9 @@ static inline void audit_free_names(stru
__putname(context->names[i].name);
}
context->name_count = 0;
- if (context->pwd)
- dput(context->pwd);
- if (context->pwdmnt)
- mntput(context->pwdmnt);
- context->pwd = NULL;
- context->pwdmnt = NULL;
+ path_put(&context->pwd);
+ context->pwd.dentry = NULL;
+ context->pwd.mnt = NULL;
}

static inline void audit_free_aux(struct audit_context *context)
@@ -910,8 +906,7 @@ static void audit_log_task_info(struct a
if ((vma->vm_flags & VM_EXECUTABLE) &&
vma->vm_file) {
audit_log_d_path(ab, "exe=",
- vma->vm_file->f_path.dentry,
- vma->vm_file->f_path.mnt);
+ &vma->vm_file->f_path);
break;
}
vma = vma->vm_next;
@@ -1177,10 +1172,10 @@ static void audit_log_exit(struct audit_
context->target_sid))
call_panic = 1;

- if (context->pwd && context->pwdmnt) {
+ if (context->pwd.dentry && context->pwd.mnt) {
ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD);
if (ab) {
- audit_log_d_path(ab, "cwd=", context->pwd, context->pwdmnt);
+ audit_log_d_path(ab, "cwd=", &context->pwd);
audit_log_end(ab);
}
}
@@ -1203,8 +1198,7 @@ static void audit_log_exit(struct audit_
case 0:
/* name was specified as a relative path and the
* directory component is the cwd */
- audit_log_d_path(ab, " name=", context->pwd,
- context->pwdmnt);
+ audit_log_d_path(ab, " name=", &context->pwd);
break;
default:
/* log the name's directory component */
@@ -1526,10 +1520,10 @@ void __audit_getname(const char *name)
context->names[context->name_count].ino = (unsigned long)-1;
context->names[context->name_count].osid = 0;
++context->name_count;
- if (!context->pwd) {
+ if (!context->pwd.dentry) {
read_lock(&current->fs->lock);
- context->pwd = dget(current->fs->pwd.dentry);
- context->pwdmnt = mntget(current->fs->pwd.mnt);
+ context->pwd = current->fs->pwd;
+ path_get(&current->fs->pwd);
read_unlock(&current->fs->lock);
}

Index: b/security/selinux/avc.c
===================================================================
--- a/security/selinux/avc.c
+++ b/security/selinux/avc.c
@@ -568,10 +568,11 @@ void avc_audit(u32 ssid, u32 tsid,
audit_log_format(ab, " capability=%d", a->u.cap);
break;
case AVC_AUDIT_DATA_FS:
- if (a->u.fs.dentry) {
- struct dentry *dentry = a->u.fs.dentry;
- if (a->u.fs.mnt) {
- audit_log_d_path(ab, "path=", dentry, a->u.fs.mnt);
+ if (a->u.fs.path.dentry) {
+ struct dentry *dentry = a->u.fs.path.dentry;
+ if (a->u.fs.path.mnt) {
+ audit_log_d_path(ab, "path=",
+ &a->u.fs.path);
} else {
audit_log_format(ab, " name=");
audit_log_untrustedstring(ab, dentry->d_name.name);
@@ -626,8 +627,10 @@ void avc_audit(u32 ssid, u32 tsid,
case AF_UNIX:
u = unix_sk(sk);
if (u->dentry) {
+ struct path path = { .dentry = u->dentry,
+ .mnt = u->mnt };
audit_log_d_path(ab, "path=",
- u->dentry, u->mnt);
+ &path);
break;
}
if (!u->addr)
Index: b/security/selinux/hooks.c
===================================================================
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1106,8 +1106,8 @@ static inline int dentry_has_perm(struct
struct inode *inode = dentry->d_inode;
struct avc_audit_data ad;
AVC_AUDIT_DATA_INIT(&ad,FS);
- ad.u.fs.mnt = mnt;
- ad.u.fs.dentry = dentry;
+ ad.u.fs.path.mnt = mnt;
+ ad.u.fs.path.dentry = dentry;
return inode_has_perm(tsk, inode, av, &ad);
}

@@ -1125,15 +1125,12 @@ static int file_has_perm(struct task_str
{
struct task_security_struct *tsec = tsk->security;
struct file_security_struct *fsec = file->f_security;
- struct vfsmount *mnt = file->f_path.mnt;
- struct dentry *dentry = file->f_path.dentry;
- struct inode *inode = dentry->d_inode;
+ struct inode *inode = file->f_path.dentry->d_inode;
struct avc_audit_data ad;
int rc;

AVC_AUDIT_DATA_INIT(&ad, FS);
- ad.u.fs.mnt = mnt;
- ad.u.fs.dentry = dentry;
+ ad.u.fs.path = file->f_path;

if (tsec->sid != fsec->sid) {
rc = avc_has_perm(tsec->sid, fsec->sid,
@@ -1168,7 +1165,7 @@ static int may_create(struct inode *dir,
sbsec = dir->i_sb->s_security;

AVC_AUDIT_DATA_INIT(&ad, FS);
- ad.u.fs.dentry = dentry;
+ ad.u.fs.path.dentry = dentry;

rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR,
DIR__ADD_NAME | DIR__SEARCH,
@@ -1226,7 +1223,7 @@ static int may_link(struct inode *dir,
isec = dentry->d_inode->i_security;

AVC_AUDIT_DATA_INIT(&ad, FS);
- ad.u.fs.dentry = dentry;
+ ad.u.fs.path.dentry = dentry;

av = DIR__SEARCH;
av |= (kind ? DIR__REMOVE_NAME : DIR__ADD_NAME);
@@ -1273,7 +1270,7 @@ static inline int may_rename(struct inod

AVC_AUDIT_DATA_INIT(&ad, FS);

- ad.u.fs.dentry = old_dentry;
+ ad.u.fs.path.dentry = old_dentry;
rc = avc_has_perm(tsec->sid, old_dsec->sid, SECCLASS_DIR,
DIR__REMOVE_NAME | DIR__SEARCH, &ad);
if (rc)
@@ -1289,7 +1286,7 @@ static inline int may_rename(struct inod
return rc;
}

- ad.u.fs.dentry = new_dentry;
+ ad.u.fs.path.dentry = new_dentry;
av = DIR__ADD_NAME | DIR__SEARCH;
if (new_dentry->d_inode)
av |= DIR__REMOVE_NAME;
@@ -1668,8 +1665,7 @@ static int selinux_bprm_set_security(str
}

AVC_AUDIT_DATA_INIT(&ad, FS);
- ad.u.fs.mnt = bprm->file->f_path.mnt;
- ad.u.fs.dentry = bprm->file->f_path.dentry;
+ ad.u.fs.path = bprm->file->f_path;

if (bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID)
newsid = tsec->sid;
@@ -2065,7 +2061,7 @@ static int selinux_sb_kern_mount(struct
return rc;

AVC_AUDIT_DATA_INIT(&ad,FS);
- ad.u.fs.dentry = sb->s_root;
+ ad.u.fs.path.dentry = sb->s_root;
return superblock_has_perm(current, sb, FILESYSTEM__MOUNT, &ad);
}

@@ -2074,7 +2070,7 @@ static int selinux_sb_statfs(struct dent
struct avc_audit_data ad;

AVC_AUDIT_DATA_INIT(&ad,FS);
- ad.u.fs.dentry = dentry->d_sb->s_root;
+ ad.u.fs.path.dentry = dentry->d_sb->s_root;
return superblock_has_perm(current, dentry->d_sb, FILESYSTEM__GETATTR, &ad);
}

@@ -2337,7 +2333,7 @@ static int selinux_inode_setxattr(struct
return -EPERM;

AVC_AUDIT_DATA_INIT(&ad,FS);
- ad.u.fs.dentry = dentry;
+ ad.u.fs.path.dentry = dentry;

rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass,
FILE__RELABELFROM, &ad);
Index: b/security/selinux/include/avc.h
===================================================================
--- a/security/selinux/include/avc.h
+++ b/security/selinux/include/avc.h
@@ -13,6 +13,7 @@
#include <linux/spinlock.h>
#include <linux/init.h>
#include <linux/in6.h>
+#include <linux/path.h>
#include <asm/system.h>
#include "flask.h"
#include "av_permissions.h"
@@ -30,8 +31,6 @@ extern int selinux_enforcing;
struct avc_entry;

struct task_struct;
-struct vfsmount;
-struct dentry;
struct inode;
struct sock;
struct sk_buff;
@@ -46,8 +45,7 @@ struct avc_audit_data {
struct task_struct *tsk;
union {
struct {
- struct vfsmount *mnt;
- struct dentry *dentry;
+ struct path path;
struct inode *inode;
} fs;
struct {

--

-
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