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    Subject[PATCH 5.14 099/100] selinux,smack: fix subjective/objective credential use mixups
    Date
    From: Paul Moore <paul@paul-moore.com>

    commit a3727a8bac0a9e77c70820655fd8715523ba3db7 upstream.

    Jann Horn reported a problem with commit eb1231f73c4d ("selinux:
    clarify task subjective and objective credentials") where some LSM
    hooks were attempting to access the subjective credentials of a task
    other than the current task. Generally speaking, it is not safe to
    access another task's subjective credentials and doing so can cause
    a number of problems.

    Further, while looking into the problem, I realized that Smack was
    suffering from a similar problem brought about by a similar commit
    1fb057dcde11 ("smack: differentiate between subjective and objective
    task credentials").

    This patch addresses this problem by restoring the use of the task's
    objective credentials in those cases where the task is other than the
    current executing task. Not only does this resolve the problem
    reported by Jann, it is arguably the correct thing to do in these
    cases.

    Cc: stable@vger.kernel.org
    Fixes: eb1231f73c4d ("selinux: clarify task subjective and objective credentials")
    Fixes: 1fb057dcde11 ("smack: differentiate between subjective and objective task credentials")
    Reported-by: Jann Horn <jannh@google.com>
    Acked-by: Eric W. Biederman <ebiederm@xmission.com>
    Acked-by: Casey Schaufler <casey@schaufler-ca.com>
    Signed-off-by: Paul Moore <paul@paul-moore.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    security/selinux/hooks.c | 4 ++--
    security/smack/smack_lsm.c | 4 ++--
    2 files changed, 4 insertions(+), 4 deletions(-)

    --- a/security/selinux/hooks.c
    +++ b/security/selinux/hooks.c
    @@ -2155,7 +2155,7 @@ static int selinux_ptrace_access_check(s
    static int selinux_ptrace_traceme(struct task_struct *parent)
    {
    return avc_has_perm(&selinux_state,
    - task_sid_subj(parent), task_sid_obj(current),
    + task_sid_obj(parent), task_sid_obj(current),
    SECCLASS_PROCESS, PROCESS__PTRACE, NULL);
    }

    @@ -6218,7 +6218,7 @@ static int selinux_msg_queue_msgrcv(stru
    struct ipc_security_struct *isec;
    struct msg_security_struct *msec;
    struct common_audit_data ad;
    - u32 sid = task_sid_subj(target);
    + u32 sid = task_sid_obj(target);
    int rc;

    isec = selinux_ipc(msq);
    --- a/security/smack/smack_lsm.c
    +++ b/security/smack/smack_lsm.c
    @@ -2016,7 +2016,7 @@ static int smk_curacc_on_task(struct tas
    const char *caller)
    {
    struct smk_audit_info ad;
    - struct smack_known *skp = smk_of_task_struct_subj(p);
    + struct smack_known *skp = smk_of_task_struct_obj(p);
    int rc;

    smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK);
    @@ -3480,7 +3480,7 @@ static void smack_d_instantiate(struct d
    */
    static int smack_getprocattr(struct task_struct *p, char *name, char **value)
    {
    - struct smack_known *skp = smk_of_task_struct_subj(p);
    + struct smack_known *skp = smk_of_task_struct_obj(p);
    char *cp;
    int slen;


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