From: Kees Cook <keescook@chromium.org> To: linux-kernel@vger.kernel.org Cc: Kees Cook <keescook@chromium.org>, Stephen Smalley <sds@tycho.nsa.gov>, Linus Torvalds <torvalds@linux-foundation.org>, Andrew Morton <akpm@linux-foundation.org>, James Morris <james.l.morris@oracle.com>, "Serge E. Hallyn" <serge@hallyn.com>, Andy Lutomirski <luto@kernel.org>, "Eric W. Biederman" <ebiederm@xmission.com>, John Johansen <john.johansen@canonical.com>, Paul Moore <paul@paul-moore.com>, Casey Schaufler <casey@schaufler-ca.com>, Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>, David Howells <dhowells@redhat.com>, linux-fsdevel@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [PATCH v5 05/15] selinux: Refactor to remove bprm_secureexec hook Date: Tue, 1 Aug 2017 12:16:28 -0700 [thread overview] Message-ID: <1501614998-62619-6-git-send-email-keescook@chromium.org> (raw) In-Reply-To: <1501614998-62619-1-git-send-email-keescook@chromium.org> The SELinux bprm_secureexec hook can be merged with the bprm_set_creds hook since it's dealing with the same information, and all of the details are finalized during the first call to the bprm_set_creds hook via prepare_binprm() (subsequent calls due to binfmt_script, etc, are ignored via bprm->called_set_creds). Here, the test can just happen at the end of the bprm_set_creds hook, and the bprm_secureexec hook can be dropped. Cc: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: Kees Cook <keescook@chromium.org> Acked-by: Paul Moore <paul@paul-moore.com> Tested-by: Paul Moore <paul@paul-moore.com> Acked-by: Serge Hallyn <serge@hallyn.com> Reviewed-by: James Morris <james.l.morris@oracle.com> Reviewed-by: Andy Lutomirski <luto@kernel.org> --- security/selinux/hooks.c | 24 +++++------------------- 1 file changed, 5 insertions(+), 19 deletions(-) diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 1db40195d178..a1f5f5ddfba7 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -2442,30 +2442,17 @@ static int selinux_bprm_set_creds(struct linux_binprm *bprm) /* Clear any possibly unsafe personality bits on exec: */ bprm->per_clear |= PER_CLEAR_ON_SETID; - } - - return 0; -} - -static int selinux_bprm_secureexec(struct linux_binprm *bprm) -{ - const struct task_security_struct *tsec = current_security(); - u32 sid, osid; - int atsecure = 0; - - sid = tsec->sid; - osid = tsec->osid; - if (osid != sid) { /* Enable secure mode for SIDs transitions unless the noatsecure permission is granted between the two SIDs, i.e. ahp returns 0. */ - atsecure = avc_has_perm(osid, sid, - SECCLASS_PROCESS, - PROCESS__NOATSECURE, NULL); + rc = avc_has_perm(old_tsec->sid, new_tsec->sid, + SECCLASS_PROCESS, PROCESS__NOATSECURE, + NULL); + bprm->secureexec |= !!rc; } - return !!atsecure; + return 0; } static int match_file(const void *p, struct file *file, unsigned fd) @@ -6266,7 +6253,6 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(bprm_set_creds, selinux_bprm_set_creds), LSM_HOOK_INIT(bprm_committing_creds, selinux_bprm_committing_creds), LSM_HOOK_INIT(bprm_committed_creds, selinux_bprm_committed_creds), - LSM_HOOK_INIT(bprm_secureexec, selinux_bprm_secureexec), LSM_HOOK_INIT(sb_alloc_security, selinux_sb_alloc_security), LSM_HOOK_INIT(sb_free_security, selinux_sb_free_security), -- 2.7.4
WARNING: multiple messages have this Message-ID (diff)
From: keescook@chromium.org (Kees Cook) To: linux-security-module@vger.kernel.org Subject: [PATCH v5 05/15] selinux: Refactor to remove bprm_secureexec hook Date: Tue, 1 Aug 2017 12:16:28 -0700 [thread overview] Message-ID: <1501614998-62619-6-git-send-email-keescook@chromium.org> (raw) In-Reply-To: <1501614998-62619-1-git-send-email-keescook@chromium.org> The SELinux bprm_secureexec hook can be merged with the bprm_set_creds hook since it's dealing with the same information, and all of the details are finalized during the first call to the bprm_set_creds hook via prepare_binprm() (subsequent calls due to binfmt_script, etc, are ignored via bprm->called_set_creds). Here, the test can just happen at the end of the bprm_set_creds hook, and the bprm_secureexec hook can be dropped. Cc: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: Kees Cook <keescook@chromium.org> Acked-by: Paul Moore <paul@paul-moore.com> Tested-by: Paul Moore <paul@paul-moore.com> Acked-by: Serge Hallyn <serge@hallyn.com> Reviewed-by: James Morris <james.l.morris@oracle.com> Reviewed-by: Andy Lutomirski <luto@kernel.org> --- security/selinux/hooks.c | 24 +++++------------------- 1 file changed, 5 insertions(+), 19 deletions(-) diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 1db40195d178..a1f5f5ddfba7 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -2442,30 +2442,17 @@ static int selinux_bprm_set_creds(struct linux_binprm *bprm) /* Clear any possibly unsafe personality bits on exec: */ bprm->per_clear |= PER_CLEAR_ON_SETID; - } - - return 0; -} - -static int selinux_bprm_secureexec(struct linux_binprm *bprm) -{ - const struct task_security_struct *tsec = current_security(); - u32 sid, osid; - int atsecure = 0; - - sid = tsec->sid; - osid = tsec->osid; - if (osid != sid) { /* Enable secure mode for SIDs transitions unless the noatsecure permission is granted between the two SIDs, i.e. ahp returns 0. */ - atsecure = avc_has_perm(osid, sid, - SECCLASS_PROCESS, - PROCESS__NOATSECURE, NULL); + rc = avc_has_perm(old_tsec->sid, new_tsec->sid, + SECCLASS_PROCESS, PROCESS__NOATSECURE, + NULL); + bprm->secureexec |= !!rc; } - return !!atsecure; + return 0; } static int match_file(const void *p, struct file *file, unsigned fd) @@ -6266,7 +6253,6 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(bprm_set_creds, selinux_bprm_set_creds), LSM_HOOK_INIT(bprm_committing_creds, selinux_bprm_committing_creds), LSM_HOOK_INIT(bprm_committed_creds, selinux_bprm_committed_creds), - LSM_HOOK_INIT(bprm_secureexec, selinux_bprm_secureexec), LSM_HOOK_INIT(sb_alloc_security, selinux_sb_alloc_security), LSM_HOOK_INIT(sb_free_security, selinux_sb_free_security), -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe linux-security-module" in the body of a message to majordomo at vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
next prev parent reply other threads:[~2017-08-01 19:20 UTC|newest] Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-08-01 19:16 [PATCH v5 00/15] exec: Use sane stack rlimit under secureexec Kees Cook 2017-08-01 19:16 ` Kees Cook 2017-08-01 19:16 ` [PATCH v5 01/15] exec: Rename bprm->cred_prepared to called_set_creds Kees Cook 2017-08-01 19:16 ` Kees Cook 2017-08-01 19:16 ` [PATCH v5 02/15] exec: Correct comments about "point of no return" Kees Cook 2017-08-01 19:16 ` Kees Cook 2017-08-01 19:16 ` [PATCH v5 03/15] binfmt: Introduce secureexec flag Kees Cook 2017-08-01 19:16 ` Kees Cook 2017-08-01 19:16 ` [PATCH v5 04/15] apparmor: Refactor to remove bprm_secureexec hook Kees Cook 2017-08-01 19:16 ` Kees Cook 2017-08-01 19:16 ` Kees Cook [this message] 2017-08-01 19:16 ` [PATCH v5 05/15] selinux: " Kees Cook 2017-08-01 19:16 ` [PATCH v5 06/15] smack: " Kees Cook 2017-08-01 19:16 ` Kees Cook 2017-08-01 19:16 ` [PATCH v5 07/15] commoncap: " Kees Cook 2017-08-01 19:16 ` Kees Cook 2017-08-01 19:16 ` [PATCH v5 08/15] commoncap: Move cap_elevated calculation into bprm_set_creds Kees Cook 2017-08-01 19:16 ` Kees Cook 2017-08-01 19:16 ` [PATCH v5 09/15] LSM: drop bprm_secureexec hook Kees Cook 2017-08-01 19:16 ` Kees Cook 2017-08-01 19:16 ` [PATCH v5 10/15] exec: Use secureexec for setting dumpability Kees Cook 2017-08-01 19:16 ` Kees Cook 2017-08-01 19:16 ` [PATCH v5 11/15] exec: Use secureexec for clearing pdeath_signal Kees Cook 2017-08-01 19:16 ` Kees Cook 2017-08-01 19:16 ` [PATCH v5 12/15] smack: Remove redundant pdeath_signal clearing Kees Cook 2017-08-01 19:16 ` Kees Cook 2017-08-01 19:16 ` [PATCH v5 13/15] exec: Consolidate dumpability logic Kees Cook 2017-08-01 19:16 ` Kees Cook 2017-08-01 19:16 ` [PATCH v5 14/15] exec: Use sane stack rlimit under secureexec Kees Cook 2017-08-01 19:16 ` Kees Cook 2017-08-01 19:16 ` [PATCH v5 15/15] exec: Consolidate pdeath_signal clearing Kees Cook 2017-08-01 19:16 ` Kees Cook
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