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Smack: fix the subject/object order in smack_ptrace_traceme()

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The order of subject/object is currently reversed in
smack_ptrace_traceme(). It is currently checked if the tracee has a
capability to trace tracer and according to this rule a decision is made
whether the tracer will be allowed to trace tracee.

Signed-off-by: Lukasz Pawelczyk <l.pawelczyk@partner.samsung.com>
Signed-off-by: Rafal Krypa <r.krypa@samsung.com>
This commit is contained in:
Lukasz Pawelczyk 2014-03-11 17:07:04 +01:00 committed by Casey Schaufler
parent 55dfc5da1a
commit 959e6c7f1e
3 changed files with 29 additions and 9 deletions
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1
security/smack/smack.h
View file

@ -225,6 +225,7 @@ 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);

33
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

4
security/smack/smack_lsm.c
View file

@ -207,11 +207,11 @@ static int smack_ptrace_traceme(struct task_struct *ptp)
if (rc != 0)
return rc;
skp = smk_of_task(task_security(ptp));
skp = smk_of_task(current_security());
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
smk_ad_setfield_u_tsk(&ad, ptp);
rc = smk_curacc(skp->smk_known, MAY_READWRITE, &ad);
rc = smk_tskacc(ptp, skp->smk_known, MAY_READWRITE, &ad);
return rc;
}