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| author | Kees Cook <keescook@chromium.org> | 2017-07-18 15:25:25 -0700 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2017-08-01 12:03:07 -0700 |
| commit | 62874c3adf709b884ceb0c61c35ab3794b3b0e95 (patch) | |
| tree | 2fab65d2a21b0c898063d1accaa59bc10793e647 /security | |
| parent | 993b3ab0642e57da5de6bef11dd50db7e2fc3b7e (diff) | |
| download | linux-62874c3adf709b884ceb0c61c35ab3794b3b0e95.tar.gz | |
selinux: Refactor to remove bprm_secureexec hook
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>
Diffstat (limited to 'security')
| -rw-r--r-- | security/selinux/hooks.c | 24 |
1 files 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), |