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Merge branch 'smack-for-3.16' of git://git.gitorious.org/smack-next/kernel into next

This commit is contained in:
James Morris 2014-05-20 14:50:09 +10:00
parent fab71a90ed ec554fa75e
commit 2fd4e6698f
5 changed files with 307 additions and 73 deletions
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10
Documentation/security/Smack.txt
View File

@ -204,6 +204,16 @@ onlycap
these capabilities are effective at for processes with any
label. The value is set by writing the desired label to the
file or cleared by writing "-" to the file.
ptrace
This is used to define the current ptrace policy
0 - default: this is the policy that relies on smack access rules.
For the PTRACE_READ a subject needs to have a read access on
object. For the PTRACE_ATTACH a read-write access is required.
1 - exact: this is the policy that limits PTRACE_ATTACH. Attach is
only allowed when subject's and object's labels are equal.
PTRACE_READ is not affected. Can be overriden with CAP_SYS_PTRACE.
2 - draconian: this policy behaves like the 'exact' above with an
exception that it can't be overriden with CAP_SYS_PTRACE.
revoke-subject
Writing a Smack label here sets the access to '-' for all access
rules with that subject label.

16
security/smack/smack.h
View File

@ -80,8 +80,8 @@ struct superblock_smack {
struct socket_smack {
struct smack_known *smk_out; /* outbound label */
char *smk_in; /* inbound label */
char *smk_packet; /* TCP peer label */
struct smack_known *smk_in; /* inbound label */
struct smack_known *smk_packet; /* TCP peer label */
};
/*
@ -133,7 +133,7 @@ struct smk_port_label {
struct list_head list;
struct sock *smk_sock; /* socket initialized on */
unsigned short smk_port; /* the port number */
char *smk_in; /* incoming label */
struct smack_known *smk_in; /* inbound label */
struct smack_known *smk_out; /* outgoing label */
};
@ -176,6 +176,14 @@ struct smk_port_label {
*/
#define SMACK_CIPSO_MAXCATNUM 184 /* 23 * 8 */
/*
* Ptrace rules
*/
#define SMACK_PTRACE_DEFAULT 0
#define SMACK_PTRACE_EXACT 1
#define SMACK_PTRACE_DRACONIAN 2
#define SMACK_PTRACE_MAX SMACK_PTRACE_DRACONIAN
/*
* Flags for untraditional access modes.
* It shouldn't be necessary to avoid conflicts with definitions
@ -225,6 +233,7 @@ struct inode_smack *new_inode_smack(char *);
*/
int smk_access_entry(char *, char *, struct list_head *);
int smk_access(struct smack_known *, char *, int, struct smk_audit_info *);
int smk_tskacc(struct task_smack *, char *, u32, struct smk_audit_info *);
int smk_curacc(char *, u32, struct smk_audit_info *);
struct smack_known *smack_from_secid(const u32);
char *smk_parse_smack(const char *string, int len);
@ -244,6 +253,7 @@ extern struct smack_known *smack_net_ambient;
extern struct smack_known *smack_onlycap;
extern struct smack_known *smack_syslog_label;
extern const char *smack_cipso_option;
extern int smack_ptrace_rule;
extern struct smack_known smack_known_floor;
extern struct smack_known smack_known_hat;

38
security/smack/smack_access.c
View File

@ -192,20 +192,21 @@ out_audit:
}
/**
* smk_curacc - determine if current has a specific access to an object
* smk_tskacc - determine if a task has a specific access to an object
* @tsp: a pointer to the subject task
* @obj_label: a pointer to the object's Smack label
* @mode: the access requested, in "MAY" format
* @a : common audit data
*
* This function checks the current subject label/object label pair
* This function checks the subject task's label/object label pair
* in the access rule list and returns 0 if the access is permitted,
* non zero otherwise. It allows that current may have the capability
* non zero otherwise. It allows that the task may have the capability
* to override the rules.
*/
int smk_curacc(char *obj_label, u32 mode, struct smk_audit_info *a)
int smk_tskacc(struct task_smack *subject, char *obj_label,
u32 mode, struct smk_audit_info *a)
{
struct task_smack *tsp = current_security();
struct smack_known *skp = smk_of_task(tsp);
struct smack_known *skp = smk_of_task(subject);
int may;
int rc;
@ -219,7 +220,7 @@ int smk_curacc(char *obj_label, u32 mode, struct smk_audit_info *a)
* it can further restrict access.
*/
may = smk_access_entry(skp->smk_known, obj_label,
&tsp->smk_rules);
&subject->smk_rules);
if (may < 0)
goto out_audit;
if ((mode & may) == mode)
@ -241,6 +242,24 @@ out_audit:
return rc;
}
/**
* smk_curacc - determine if current has a specific access to an object
* @obj_label: a pointer to the object's Smack label
* @mode: the access requested, in "MAY" format
* @a : common audit data
*
* This function checks the current subject label/object label pair
* in the access rule list and returns 0 if the access is permitted,
* non zero otherwise. It allows that current may have the capability
* to override the rules.
*/
int smk_curacc(char *obj_label, u32 mode, struct smk_audit_info *a)
{
struct task_smack *tsp = current_security();
return smk_tskacc(tsp, obj_label, mode, a);
}
#ifdef CONFIG_AUDIT
/**
* smack_str_from_perm : helper to transalate an int to a
@ -285,7 +304,10 @@ static void smack_log_callback(struct audit_buffer *ab, void *a)
audit_log_untrustedstring(ab, sad->subject);
audit_log_format(ab, " object=");
audit_log_untrustedstring(ab, sad->object);
audit_log_format(ab, " requested=%s", sad->request);
if (sad->request[0] == '\0')
audit_log_format(ab, " labels_differ");
else
audit_log_format(ab, " requested=%s", sad->request);
}
/**

240
security/smack/smack_lsm.c
View File

@ -157,6 +157,74 @@ static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead,
return rc;
}
/**
* smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_*
* @mode - input mode in form of PTRACE_MODE_*
*
* Returns a converted MAY_* mode usable by smack rules
*/
static inline unsigned int smk_ptrace_mode(unsigned int mode)
{
switch (mode) {
case PTRACE_MODE_READ:
return MAY_READ;
case PTRACE_MODE_ATTACH:
return MAY_READWRITE;
}
return 0;
}
/**
* smk_ptrace_rule_check - helper for ptrace access
* @tracer: tracer process
* @tracee_label: label of the process that's about to be traced,
* the pointer must originate from smack structures
* @mode: ptrace attachment mode (PTRACE_MODE_*)
* @func: name of the function that called us, used for audit
*
* Returns 0 on access granted, -error on error
*/
static int smk_ptrace_rule_check(struct task_struct *tracer, char *tracee_label,
unsigned int mode, const char *func)
{
int rc;
struct smk_audit_info ad, *saip = NULL;
struct task_smack *tsp;
struct smack_known *skp;
if ((mode & PTRACE_MODE_NOAUDIT) == 0) {
smk_ad_init(&ad, func, LSM_AUDIT_DATA_TASK);
smk_ad_setfield_u_tsk(&ad, tracer);
saip = &ad;
}
tsp = task_security(tracer);
skp = smk_of_task(tsp);
if ((mode & PTRACE_MODE_ATTACH) &&
(smack_ptrace_rule == SMACK_PTRACE_EXACT ||
smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)) {
if (skp->smk_known == tracee_label)
rc = 0;
else if (smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)
rc = -EACCES;
else if (capable(CAP_SYS_PTRACE))
rc = 0;
else
rc = -EACCES;
if (saip)
smack_log(skp->smk_known, tracee_label, 0, rc, saip);
return rc;
}
/* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */
rc = smk_tskacc(tsp, tracee_label, smk_ptrace_mode(mode), saip);
return rc;
}
/*
* LSM hooks.
* We he, that is fun!
@ -165,16 +233,15 @@ static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead,
/**
* smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
* @ctp: child task pointer
* @mode: ptrace attachment mode
* @mode: ptrace attachment mode (PTRACE_MODE_*)
*
* Returns 0 if access is OK, an error code otherwise
*
* Do the capability checks, and require read and write.
* Do the capability checks.
*/
static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
{
int rc;
struct smk_audit_info ad;
struct smack_known *skp;
rc = cap_ptrace_access_check(ctp, mode);
@ -182,10 +249,8 @@ static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
return rc;
skp = smk_of_task(task_security(ctp));
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
smk_ad_setfield_u_tsk(&ad, ctp);
rc = smk_curacc(skp->smk_known, mode, &ad);
rc = smk_ptrace_rule_check(current, skp->smk_known, mode, __func__);
return rc;
}
@ -195,23 +260,21 @@ static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
*
* Returns 0 if access is OK, an error code otherwise
*
* Do the capability checks, and require read and write.
* Do the capability checks, and require PTRACE_MODE_ATTACH.
*/
static int smack_ptrace_traceme(struct task_struct *ptp)
{
int rc;
struct smk_audit_info ad;
struct smack_known *skp;
rc = cap_ptrace_traceme(ptp);
if (rc != 0)
return rc;
skp = smk_of_task(task_security(ptp));
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
smk_ad_setfield_u_tsk(&ad, ptp);
skp = smk_of_task(current_security());
rc = smk_curacc(skp->smk_known, MAY_READWRITE, &ad);
rc = smk_ptrace_rule_check(ptp, skp->smk_known,
PTRACE_MODE_ATTACH, __func__);
return rc;
}
@ -413,9 +476,11 @@ static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
* Initialize the root inode.
*/
isp = inode->i_security;
if (inode->i_security == NULL) {
inode->i_security = new_inode_smack(sp->smk_root);
isp = inode->i_security;
if (isp == NULL) {
isp = new_inode_smack(sp->smk_root);
if (isp == NULL)
return -ENOMEM;
inode->i_security = isp;
} else
isp->smk_inode = sp->smk_root;
@ -453,7 +518,7 @@ static int smack_sb_statfs(struct dentry *dentry)
* smack_bprm_set_creds - set creds for exec
* @bprm: the exec information
*
* Returns 0 if it gets a blob, -ENOMEM otherwise
* Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise
*/
static int smack_bprm_set_creds(struct linux_binprm *bprm)
{
@ -473,7 +538,22 @@ static int smack_bprm_set_creds(struct linux_binprm *bprm)
if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task)
return 0;
if (bprm->unsafe)
if (bprm->unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) {
struct task_struct *tracer;
rc = 0;
rcu_read_lock();
tracer = ptrace_parent(current);
if (likely(tracer != NULL))
rc = smk_ptrace_rule_check(tracer,
isp->smk_task->smk_known,
PTRACE_MODE_ATTACH,
__func__);
rcu_read_unlock();
if (rc != 0)
return rc;
} else if (bprm->unsafe)
return -EPERM;
bsp->smk_task = isp->smk_task;
@ -880,18 +960,20 @@ static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
return;
}
skp = smk_import_entry(value, size);
if (strcmp(name, XATTR_NAME_SMACK) == 0) {
skp = smk_import_entry(value, size);
if (skp != NULL)
isp->smk_inode = skp->smk_known;
else
isp->smk_inode = smack_known_invalid.smk_known;
} else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
skp = smk_import_entry(value, size);
if (skp != NULL)
isp->smk_task = skp;
else
isp->smk_task = &smack_known_invalid;
} else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
skp = smk_import_entry(value, size);
if (skp != NULL)
isp->smk_mmap = skp;
else
@ -938,24 +1020,37 @@ static int smack_inode_removexattr(struct dentry *dentry, const char *name)
strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 ||
strcmp(name, XATTR_NAME_SMACKMMAP)) {
strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
if (!smack_privileged(CAP_MAC_ADMIN))
rc = -EPERM;
} else
rc = cap_inode_removexattr(dentry, name);
if (rc != 0)
return rc;
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
if (rc == 0)
rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
if (rc == 0) {
isp = dentry->d_inode->i_security;
rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
if (rc != 0)
return rc;
isp = dentry->d_inode->i_security;
/*
* Don't do anything special for these.
* XATTR_NAME_SMACKIPIN
* XATTR_NAME_SMACKIPOUT
* XATTR_NAME_SMACKEXEC
*/
if (strcmp(name, XATTR_NAME_SMACK) == 0)
isp->smk_task = NULL;
else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0)
isp->smk_mmap = NULL;
}
else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0)
isp->smk_flags &= ~SMK_INODE_TRANSMUTE;
return rc;
return 0;
}
/**
@ -1000,7 +1095,7 @@ static int smack_inode_getsecurity(const struct inode *inode,
ssp = sock->sk->sk_security;
if (strcmp(name, XATTR_SMACK_IPIN) == 0)
isp = ssp->smk_in;
isp = ssp->smk_in->smk_known;
else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
isp = ssp->smk_out->smk_known;
else
@ -1367,19 +1462,32 @@ static int smack_file_receive(struct file *file)
/**
* smack_file_open - Smack dentry open processing
* @file: the object
* @cred: unused
* @cred: task credential
*
* Set the security blob in the file structure.
* Allow the open only if the task has read access. There are
* many read operations (e.g. fstat) that you can do with an
* fd even if you have the file open write-only.
*
* Returns 0
*/
static int smack_file_open(struct file *file, const struct cred *cred)
{
struct task_smack *tsp = cred->security;
struct inode_smack *isp = file_inode(file)->i_security;
struct smk_audit_info ad;
int rc;
file->f_security = isp->smk_inode;
if (smack_privileged(CAP_MAC_OVERRIDE))
return 0;
return 0;
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
smk_ad_setfield_u_fs_path(&ad, file->f_path);
rc = smk_access(tsp->smk_task, isp->smk_inode, MAY_READ, &ad);
if (rc == 0)
file->f_security = isp->smk_inode;
return rc;
}
/*
@ -1764,7 +1872,7 @@ static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
if (ssp == NULL)
return -ENOMEM;
ssp->smk_in = skp->smk_known;
ssp->smk_in = skp;
ssp->smk_out = skp;
ssp->smk_packet = NULL;
@ -2004,7 +2112,7 @@ static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address,
if (act == SMK_RECEIVING) {
skp = smack_net_ambient;
object = ssp->smk_in;
object = ssp->smk_in->smk_known;
} else {
skp = ssp->smk_out;
object = smack_net_ambient->smk_known;
@ -2034,9 +2142,9 @@ static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address,
list_for_each_entry(spp, &smk_ipv6_port_list, list) {
if (spp->smk_port != port)
continue;
object = spp->smk_in;
object = spp->smk_in->smk_known;
if (act == SMK_CONNECTING)
ssp->smk_packet = spp->smk_out->smk_known;
ssp->smk_packet = spp->smk_out;
break;
}
@ -2076,7 +2184,7 @@ static int smack_inode_setsecurity(struct inode *inode, const char *name,
int rc = 0;
if (value == NULL || size > SMK_LONGLABEL || size == 0)
return -EACCES;
return -EINVAL;
skp = smk_import_entry(value, size);
if (skp == NULL)
@ -2100,7 +2208,7 @@ static int smack_inode_setsecurity(struct inode *inode, const char *name,
ssp = sock->sk->sk_security;
if (strcmp(name, XATTR_SMACK_IPIN) == 0)
ssp->smk_in = skp->smk_known;
ssp->smk_in = skp;
else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
ssp->smk_out = skp;
if (sock->sk->sk_family == PF_INET) {
@ -2713,6 +2821,15 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
* of the superblock.
*/
if (opt_dentry->d_parent == opt_dentry) {
if (sbp->s_magic == CGROUP_SUPER_MAGIC) {
/*
* The cgroup filesystem is never mounted,
* so there's no opportunity to set the mount
* options.
*/
sbsp->smk_root = smack_known_star.smk_known;
sbsp->smk_default = smack_known_star.smk_known;
}
isp->smk_inode = sbsp->smk_root;
isp->smk_flags |= SMK_INODE_INSTANT;
goto unlockandout;
@ -2726,16 +2843,20 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
*/
switch (sbp->s_magic) {
case SMACK_MAGIC:
case PIPEFS_MAGIC:
case SOCKFS_MAGIC:
case CGROUP_SUPER_MAGIC:
/*
* Casey says that it's a little embarrassing
* that the smack file system doesn't do
* extended attributes.
*/
final = smack_known_star.smk_known;
break;
case PIPEFS_MAGIC:
/*
*
* Casey says pipes are easy (?)
*
* Socket access is controlled by the socket
* structures associated with the task involved.
*
* Cgroupfs is special
*/
final = smack_known_star.smk_known;
break;
@ -2747,13 +2868,6 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
*/
final = ckp->smk_known;
break;
case SOCKFS_MAGIC:
/*
* Socket access is controlled by the socket
* structures associated with the task involved.
*/
final = smack_known_star.smk_known;
break;
case PROC_SUPER_MAGIC:
/*
* Casey says procfs appears not to care.
@ -2959,30 +3073,34 @@ static int smack_unix_stream_connect(struct sock *sock,
struct sock *other, struct sock *newsk)
{
struct smack_known *skp;
struct smack_known *okp;
struct socket_smack *ssp = sock->sk_security;
struct socket_smack *osp = other->sk_security;
struct socket_smack *nsp = newsk->sk_security;
struct smk_audit_info ad;
int rc = 0;
#ifdef CONFIG_AUDIT
struct lsm_network_audit net;
smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
smk_ad_setfield_u_net_sk(&ad, other);
#endif
if (!smack_privileged(CAP_MAC_OVERRIDE)) {
skp = ssp->smk_out;
rc = smk_access(skp, osp->smk_in, MAY_WRITE, &ad);
okp = osp->smk_out;
#ifdef CONFIG_AUDIT
smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
smk_ad_setfield_u_net_sk(&ad, other);
#endif
rc = smk_access(skp, okp->smk_known, MAY_WRITE, &ad);
if (rc == 0)
rc = smk_access(okp, okp->smk_known, MAY_WRITE, NULL);
}
/*
* Cross reference the peer labels for SO_PEERSEC.
*/
if (rc == 0) {
nsp->smk_packet = ssp->smk_out->smk_known;
ssp->smk_packet = osp->smk_out->smk_known;
nsp->smk_packet = ssp->smk_out;
ssp->smk_packet = osp->smk_out;
}
return rc;
@ -3014,7 +3132,7 @@ static int smack_unix_may_send(struct socket *sock, struct socket *other)
return 0;
skp = ssp->smk_out;
return smk_access(skp, osp->smk_in, MAY_WRITE, &ad);
return smk_access(skp, osp->smk_in->smk_known, MAY_WRITE, &ad);
}
/**
@ -3109,7 +3227,7 @@ static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
if (found)
return skp;
if (ssp != NULL && ssp->smk_in == smack_known_star.smk_known)
if (ssp != NULL && ssp->smk_in == &smack_known_star)
return &smack_known_web;
return &smack_known_star;
}
@ -3228,7 +3346,7 @@ static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
* This is the simplist possible security model
* for networking.
*/
rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
rc = smk_access(skp, ssp->smk_in->smk_known, MAY_WRITE, &ad);
if (rc != 0)
netlbl_skbuff_err(skb, rc, 0);
break;
@ -3263,7 +3381,7 @@ static int smack_socket_getpeersec_stream(struct socket *sock,
ssp = sock->sk->sk_security;
if (ssp->smk_packet != NULL) {
rcp = ssp->smk_packet;
rcp = ssp->smk_packet->smk_known;
slen = strlen(rcp) + 1;
}
@ -3348,7 +3466,7 @@ static void smack_sock_graft(struct sock *sk, struct socket *parent)
return;
ssp = sk->sk_security;
ssp->smk_in = skp->smk_known;
ssp->smk_in = skp;
ssp->smk_out = skp;
/* cssp->smk_packet is already set in smack_inet_csk_clone() */
}
@ -3408,7 +3526,7 @@ static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
* Receiving a packet requires that the other end be able to write
* here. Read access is not required.
*/
rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
rc = smk_access(skp, ssp->smk_in->smk_known, MAY_WRITE, &ad);
if (rc != 0)
return rc;
@ -3452,7 +3570,7 @@ static void smack_inet_csk_clone(struct sock *sk,
if (req->peer_secid != 0) {
skp = smack_from_secid(req->peer_secid);
ssp->smk_packet = skp->smk_known;
ssp->smk_packet = skp;
} else
ssp->smk_packet = NULL;
}

76
security/smack/smackfs.c
View File

@ -53,6 +53,7 @@ enum smk_inos {
SMK_REVOKE_SUBJ = 18, /* set rules with subject label to '-' */
SMK_CHANGE_RULE = 19, /* change or add rules (long labels) */
SMK_SYSLOG = 20, /* change syslog label) */
SMK_PTRACE = 21, /* set ptrace rule */
};
/*
@ -100,6 +101,15 @@ struct smack_known *smack_onlycap;
*/
struct smack_known *smack_syslog_label;
/*
* Ptrace current rule
* SMACK_PTRACE_DEFAULT regular smack ptrace rules (/proc based)
* SMACK_PTRACE_EXACT labels must match, but can be overriden with
* CAP_SYS_PTRACE
* SMACK_PTRACE_DRACONIAN lables must match, CAP_SYS_PTRACE has no effect
*/
int smack_ptrace_rule = SMACK_PTRACE_DEFAULT;
/*
* Certain IP addresses may be designated as single label hosts.
* Packets are sent there unlabeled, but only from tasks that
@ -1183,7 +1193,7 @@ static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf,
data[count] = '\0';
rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%d %s",
rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s",
&host[0], &host[1], &host[2], &host[3], &m, smack);
if (rc != 6) {
rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
@ -2243,6 +2253,68 @@ static const struct file_operations smk_syslog_ops = {
};
/**
* smk_read_ptrace - read() for /smack/ptrace
* @filp: file pointer, not actually used
* @buf: where to put the result
* @count: maximum to send along
* @ppos: where to start
*
* Returns number of bytes read or error code, as appropriate
*/
static ssize_t smk_read_ptrace(struct file *filp, char __user *buf,
size_t count, loff_t *ppos)
{
char temp[32];
ssize_t rc;
if (*ppos != 0)
return 0;
sprintf(temp, "%d\n", smack_ptrace_rule);
rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
return rc;
}
/**
* smk_write_ptrace - write() for /smack/ptrace
* @file: file pointer
* @buf: data from user space
* @count: bytes sent
* @ppos: where to start - must be 0
*/
static ssize_t smk_write_ptrace(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
char temp[32];
int i;
if (!smack_privileged(CAP_MAC_ADMIN))
return -EPERM;
if (*ppos != 0 || count >= sizeof(temp) || count == 0)
return -EINVAL;
if (copy_from_user(temp, buf, count) != 0)
return -EFAULT;
temp[count] = '\0';
if (sscanf(temp, "%d", &i) != 1)
return -EINVAL;
if (i < SMACK_PTRACE_DEFAULT || i > SMACK_PTRACE_MAX)
return -EINVAL;
smack_ptrace_rule = i;
return count;
}
static const struct file_operations smk_ptrace_ops = {
.write = smk_write_ptrace,
.read = smk_read_ptrace,
.llseek = default_llseek,
};
/**
* smk_fill_super - fill the smackfs superblock
* @sb: the empty superblock
@ -2296,6 +2368,8 @@ static int smk_fill_super(struct super_block *sb, void *data, int silent)
"change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR},
[SMK_SYSLOG] = {
"syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR},
[SMK_PTRACE] = {
"ptrace", &smk_ptrace_ops, S_IRUGO|S_IWUSR},
/* last one */
{""}
};