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LSM: separate LSM_AUDIT_DATA_DENTRY from LSM_AUDIT_DATA_PATH

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This patch separates and audit message that only contains a dentry from
one that contains a full path.  This allows us to make it harder to
misuse the interfaces or for the interfaces to be implemented wrong.

Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
This commit is contained in:
Eric Paris 2011-04-25 13:10:27 -04:00
parent f48b739984
commit a269434d2f
5 changed files with 52 additions and 42 deletions
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2
include/linux/lsm_audit.h
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@ -36,9 +36,11 @@ struct common_audit_data {
#define LSM_AUDIT_DATA_NONE 7 #define LSM_AUDIT_DATA_NONE 7
#define LSM_AUDIT_DATA_KMOD 8 #define LSM_AUDIT_DATA_KMOD 8
#define LSM_AUDIT_DATA_INODE 9 #define LSM_AUDIT_DATA_INODE 9
#define LSM_AUDIT_DATA_DENTRY 10
struct task_struct *tsk; struct task_struct *tsk;
union { union {
struct path path; struct path path;
struct dentry *dentry;
struct inode *inode; struct inode *inode;
struct { struct {
int netif; int netif;

25
security/lsm_audit.c
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@ -229,17 +229,24 @@ static void dump_common_audit_data(struct audit_buffer *ab,
audit_log_format(ab, " capability=%d ", a->u.cap); audit_log_format(ab, " capability=%d ", a->u.cap);
break; break;
case LSM_AUDIT_DATA_PATH: { case LSM_AUDIT_DATA_PATH: {
struct dentry *dentry = a->u.path.dentry;
struct inode *inode; struct inode *inode;
if (a->u.path.mnt) { audit_log_d_path(ab, "path=", &a->u.path);
audit_log_d_path(ab, "path=", &a->u.path);
} else { inode = a->u.path.dentry->d_inode;
audit_log_format(ab, " name="); if (inode)
audit_log_untrustedstring(ab, audit_log_format(ab, " dev=%s ino=%lu",
dentry->d_name.name); inode->i_sb->s_id,
} inode->i_ino);
inode = dentry->d_inode; break;
}
case LSM_AUDIT_DATA_DENTRY: {
struct inode *inode;
audit_log_format(ab, " name=");
audit_log_untrustedstring(ab, a->u.dentry->d_name.name);
inode = a->u.dentry->d_inode;
if (inode) if (inode)
audit_log_format(ab, " dev=%s ino=%lu", audit_log_format(ab, " dev=%s ino=%lu",
inode->i_sb->s_id, inode->i_sb->s_id,

26
security/selinux/hooks.c
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@ -1569,8 +1569,8 @@ static int may_create(struct inode *dir,
sid = tsec->sid; sid = tsec->sid;
newsid = tsec->create_sid; newsid = tsec->create_sid;
COMMON_AUDIT_DATA_INIT(&ad, PATH); COMMON_AUDIT_DATA_INIT(&ad, DENTRY);
ad.u.path.dentry = dentry; ad.u.dentry = dentry;
rc = avc_has_perm(sid, dsec->sid, SECCLASS_DIR, rc = avc_has_perm(sid, dsec->sid, SECCLASS_DIR,
DIR__ADD_NAME | DIR__SEARCH, DIR__ADD_NAME | DIR__SEARCH,
@ -1621,8 +1621,8 @@ static int may_link(struct inode *dir,
dsec = dir->i_security; dsec = dir->i_security;
isec = dentry->d_inode->i_security; isec = dentry->d_inode->i_security;
COMMON_AUDIT_DATA_INIT(&ad, PATH); COMMON_AUDIT_DATA_INIT(&ad, DENTRY);
ad.u.path.dentry = dentry; ad.u.dentry = dentry;
av = DIR__SEARCH; av = DIR__SEARCH;
av |= (kind ? DIR__REMOVE_NAME : DIR__ADD_NAME); av |= (kind ? DIR__REMOVE_NAME : DIR__ADD_NAME);
@ -1667,9 +1667,9 @@ static inline int may_rename(struct inode *old_dir,
old_is_dir = S_ISDIR(old_dentry->d_inode->i_mode); old_is_dir = S_ISDIR(old_dentry->d_inode->i_mode);
new_dsec = new_dir->i_security; new_dsec = new_dir->i_security;
COMMON_AUDIT_DATA_INIT(&ad, PATH); COMMON_AUDIT_DATA_INIT(&ad, DENTRY);
ad.u.path.dentry = old_dentry; ad.u.dentry = old_dentry;
rc = avc_has_perm(sid, old_dsec->sid, SECCLASS_DIR, rc = avc_has_perm(sid, old_dsec->sid, SECCLASS_DIR,
DIR__REMOVE_NAME | DIR__SEARCH, &ad); DIR__REMOVE_NAME | DIR__SEARCH, &ad);
if (rc) if (rc)
@ -1685,7 +1685,7 @@ static inline int may_rename(struct inode *old_dir,
return rc; return rc;
} }
ad.u.path.dentry = new_dentry; ad.u.dentry = new_dentry;
av = DIR__ADD_NAME | DIR__SEARCH; av = DIR__ADD_NAME | DIR__SEARCH;
if (new_dentry->d_inode) if (new_dentry->d_inode)
av |= DIR__REMOVE_NAME; av |= DIR__REMOVE_NAME;
@ -2468,8 +2468,8 @@ static int selinux_sb_kern_mount(struct super_block *sb, int flags, void *data)
if (flags & MS_KERNMOUNT) if (flags & MS_KERNMOUNT)
return 0; return 0;
COMMON_AUDIT_DATA_INIT(&ad, PATH); COMMON_AUDIT_DATA_INIT(&ad, DENTRY);
ad.u.path.dentry = sb->s_root; ad.u.dentry = sb->s_root;
return superblock_has_perm(cred, sb, FILESYSTEM__MOUNT, &ad); return superblock_has_perm(cred, sb, FILESYSTEM__MOUNT, &ad);
} }
@ -2478,8 +2478,8 @@ static int selinux_sb_statfs(struct dentry *dentry)
const struct cred *cred = current_cred(); const struct cred *cred = current_cred();
struct common_audit_data ad; struct common_audit_data ad;
COMMON_AUDIT_DATA_INIT(&ad, PATH); COMMON_AUDIT_DATA_INIT(&ad, DENTRY);
ad.u.path.dentry = dentry->d_sb->s_root; ad.u.dentry = dentry->d_sb->s_root;
return superblock_has_perm(cred, dentry->d_sb, FILESYSTEM__GETATTR, &ad); return superblock_has_perm(cred, dentry->d_sb, FILESYSTEM__GETATTR, &ad);
} }
@ -2732,8 +2732,8 @@ static int selinux_inode_setxattr(struct dentry *dentry, const char *name,
if (!is_owner_or_cap(inode)) if (!is_owner_or_cap(inode))
return -EPERM; return -EPERM;
COMMON_AUDIT_DATA_INIT(&ad, PATH); COMMON_AUDIT_DATA_INIT(&ad, DENTRY);
ad.u.path.dentry = dentry; ad.u.dentry = dentry;
rc = avc_has_perm(sid, isec->sid, isec->sclass, rc = avc_has_perm(sid, isec->sid, isec->sclass,
FILE__RELABELFROM, &ad); FILE__RELABELFROM, &ad);

7
security/smack/smack.h
View File

@ -316,12 +316,7 @@ static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a, static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
struct dentry *d) struct dentry *d)
{ {
a->a.u.path.dentry = d; a->a.u.dentry = d;
}
static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a,
struct vfsmount *m)
{
a->a.u.path.mnt = m;
} }
static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a, static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
struct inode *i) struct inode *i)

34
security/smack/smack_lsm.c
View File

@ -383,7 +383,7 @@ static int smack_sb_statfs(struct dentry *dentry)
int rc; int rc;
struct smk_audit_info ad; struct smk_audit_info ad;
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
smk_ad_setfield_u_fs_path_dentry(&ad, dentry); smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad); rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad);
@ -425,10 +425,13 @@ static int smack_sb_umount(struct vfsmount *mnt, int flags)
{ {
struct superblock_smack *sbp; struct superblock_smack *sbp;
struct smk_audit_info ad; struct smk_audit_info ad;
struct path path;
path.dentry = mnt->mnt_root;
path.mnt = mnt;
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
smk_ad_setfield_u_fs_path_dentry(&ad, mnt->mnt_root); smk_ad_setfield_u_fs_path(&ad, path);
smk_ad_setfield_u_fs_path_mnt(&ad, mnt);
sbp = mnt->mnt_sb->s_security; sbp = mnt->mnt_sb->s_security;
return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad); return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
@ -563,7 +566,7 @@ static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
struct smk_audit_info ad; struct smk_audit_info ad;
int rc; int rc;
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
isp = smk_of_inode(old_dentry->d_inode); isp = smk_of_inode(old_dentry->d_inode);
@ -592,7 +595,7 @@ static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
struct smk_audit_info ad; struct smk_audit_info ad;
int rc; int rc;
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
smk_ad_setfield_u_fs_path_dentry(&ad, dentry); smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
/* /*
@ -623,7 +626,7 @@ static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
struct smk_audit_info ad; struct smk_audit_info ad;
int rc; int rc;
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
smk_ad_setfield_u_fs_path_dentry(&ad, dentry); smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
/* /*
@ -663,7 +666,7 @@ static int smack_inode_rename(struct inode *old_inode,
char *isp; char *isp;
struct smk_audit_info ad; struct smk_audit_info ad;
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
isp = smk_of_inode(old_dentry->d_inode); isp = smk_of_inode(old_dentry->d_inode);
@ -720,7 +723,7 @@ static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
*/ */
if (iattr->ia_valid & ATTR_FORCE) if (iattr->ia_valid & ATTR_FORCE)
return 0; return 0;
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
smk_ad_setfield_u_fs_path_dentry(&ad, dentry); smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
@ -736,10 +739,13 @@ static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
{ {
struct smk_audit_info ad; struct smk_audit_info ad;
struct path path;
path.dentry = dentry;
path.mnt = mnt;
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
smk_ad_setfield_u_fs_path_dentry(&ad, dentry); smk_ad_setfield_u_fs_path(&ad, path);
smk_ad_setfield_u_fs_path_mnt(&ad, mnt);
return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
} }
@ -784,7 +790,7 @@ static int smack_inode_setxattr(struct dentry *dentry, const char *name,
} else } else
rc = cap_inode_setxattr(dentry, name, value, size, flags); rc = cap_inode_setxattr(dentry, name, value, size, flags);
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
smk_ad_setfield_u_fs_path_dentry(&ad, dentry); smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
if (rc == 0) if (rc == 0)
@ -845,7 +851,7 @@ static int smack_inode_getxattr(struct dentry *dentry, const char *name)
{ {
struct smk_audit_info ad; struct smk_audit_info ad;
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
smk_ad_setfield_u_fs_path_dentry(&ad, dentry); smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
@ -877,7 +883,7 @@ static int smack_inode_removexattr(struct dentry *dentry, const char *name)
} else } else
rc = cap_inode_removexattr(dentry, name); rc = cap_inode_removexattr(dentry, name);
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
smk_ad_setfield_u_fs_path_dentry(&ad, dentry); smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
if (rc == 0) if (rc == 0)
rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
@ -1070,7 +1076,7 @@ static int smack_file_lock(struct file *file, unsigned int cmd)
{ {
struct smk_audit_info ad; struct smk_audit_info ad;
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
smk_ad_setfield_u_fs_path_dentry(&ad, file->f_path.dentry); smk_ad_setfield_u_fs_path_dentry(&ad, file->f_path.dentry);
return smk_curacc(file->f_security, MAY_WRITE, &ad); return smk_curacc(file->f_security, MAY_WRITE, &ad);
} }