diff options
Diffstat (limited to 'security/smack')
| -rw-r--r-- | security/smack/smack.h | 1 | ||||
| -rw-r--r-- | security/smack/smack_lsm.c | 44 |
2 files changed, 36 insertions, 9 deletions
diff --git a/security/smack/smack.h b/security/smack/smack.h index 4ede719922ed..cf2594dfa933 100644 --- a/security/smack/smack.h +++ b/security/smack/smack.h @@ -66,6 +66,7 @@ struct task_smack { #define SMK_INODE_INSTANT 0x01 /* inode is instantiated */ #define SMK_INODE_TRANSMUTE 0x02 /* directory is transmuting */ +#define SMK_INODE_CHANGED 0x04 /* smack was transmuted */ /* * A label access rule. diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index 45c32f074166..df45d3939188 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -556,6 +556,7 @@ static int smack_inode_init_security(struct inode *inode, struct inode *dir, void **value, size_t *len) { struct smack_known *skp; + struct inode_smack *issp = inode->i_security; char *csp = smk_of_current(); char *isp = smk_of_inode(inode); char *dsp = smk_of_inode(dir); @@ -577,10 +578,13 @@ static int smack_inode_init_security(struct inode *inode, struct inode *dir, * If the access rule allows transmutation and * the directory requests transmutation then * by all means transmute. + * Mark the inode as changed. */ if (may > 0 && ((may & MAY_TRANSMUTE) != 0) && - smk_inode_transmutable(dir)) + smk_inode_transmutable(dir)) { isp = dsp; + issp->smk_flags |= SMK_INODE_CHANGED; + } *value = kstrdup(isp, GFP_KERNEL); if (*value == NULL) @@ -2552,6 +2556,7 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) char *final; char trattr[TRANS_TRUE_SIZE]; int transflag = 0; + int rc; struct dentry *dp; if (inode == NULL) @@ -2670,17 +2675,38 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) */ dp = dget(opt_dentry); fetched = smk_fetch(XATTR_NAME_SMACK, inode, dp); - if (fetched != NULL) { + if (fetched != NULL) final = fetched; - if (S_ISDIR(inode->i_mode)) { - trattr[0] = '\0'; - inode->i_op->getxattr(dp, + + /* + * Transmuting directory + */ + if (S_ISDIR(inode->i_mode)) { + /* + * If this is a new directory and the label was + * transmuted when the inode was initialized + * set the transmute attribute on the directory + * and mark the inode. + * + * If there is a transmute attribute on the + * directory mark the inode. + */ + if (isp->smk_flags & SMK_INODE_CHANGED) { + isp->smk_flags &= ~SMK_INODE_CHANGED; + rc = inode->i_op->setxattr(dp, XATTR_NAME_SMACKTRANSMUTE, - trattr, TRANS_TRUE_SIZE); - if (strncmp(trattr, TRANS_TRUE, - TRANS_TRUE_SIZE) == 0) - transflag = SMK_INODE_TRANSMUTE; + TRANS_TRUE, TRANS_TRUE_SIZE, + 0); + } else { + rc = inode->i_op->getxattr(dp, + XATTR_NAME_SMACKTRANSMUTE, trattr, + TRANS_TRUE_SIZE); + if (rc >= 0 && strncmp(trattr, TRANS_TRUE, + TRANS_TRUE_SIZE) != 0) + rc = -EINVAL; } + if (rc >= 0) + transflag = SMK_INODE_TRANSMUTE; } isp->smk_task = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp); isp->smk_mmap = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp); |