From 993b3ab0642e57da5de6bef11dd50db7e2fc3b7e Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Tue, 18 Jul 2017 15:25:24 -0700 Subject: [PATCH] apparmor: Refactor to remove bprm_secureexec hook The AppArmor 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, all the comments describe how secureexec is actually calculated during bprm_set_creds, so this actually does it, drops the bprm flag that was being used internally by AppArmor, and drops the bprm_secureexec hook. Signed-off-by: Kees Cook Acked-by: John Johansen Reviewed-by: James Morris Acked-by: Serge Hallyn --- security/apparmor/domain.c | 19 +------------------ security/apparmor/include/domain.h | 1 - security/apparmor/include/file.h | 3 --- security/apparmor/lsm.c | 1 - 4 files changed, 1 insertion(+), 23 deletions(-) diff --git a/security/apparmor/domain.c b/security/apparmor/domain.c index 67ec52cfc523..17a601c67b62 100644 --- a/security/apparmor/domain.c +++ b/security/apparmor/domain.c @@ -807,7 +807,7 @@ int apparmor_bprm_set_creds(struct linux_binprm *bprm) aa_label_printk(new, GFP_ATOMIC); dbg_printk("\n"); } - bprm->unsafe |= AA_SECURE_X_NEEDED; + bprm->secureexec = 1; } if (label->proxy != new->proxy) { @@ -843,23 +843,6 @@ audit: goto done; } -/** - * apparmor_bprm_secureexec - determine if secureexec is needed - * @bprm: binprm for exec (NOT NULL) - * - * Returns: %1 if secureexec is needed else %0 - */ -int apparmor_bprm_secureexec(struct linux_binprm *bprm) -{ - /* the decision to use secure exec is computed in set_creds - * and stored in bprm->unsafe. - */ - if (bprm->unsafe & AA_SECURE_X_NEEDED) - return 1; - - return 0; -} - /* * Functions for self directed profile change */ diff --git a/security/apparmor/include/domain.h b/security/apparmor/include/domain.h index bab5810b6e9a..24c5976d6143 100644 --- a/security/apparmor/include/domain.h +++ b/security/apparmor/include/domain.h @@ -30,7 +30,6 @@ struct aa_domain { #define AA_CHANGE_STACK 8 int apparmor_bprm_set_creds(struct linux_binprm *bprm); -int apparmor_bprm_secureexec(struct linux_binprm *bprm); void aa_free_domain_entries(struct aa_domain *domain); int aa_change_hat(const char *hats[], int count, u64 token, int flags); diff --git a/security/apparmor/include/file.h b/security/apparmor/include/file.h index 001e40073ff9..4c2c8ac8842f 100644 --- a/security/apparmor/include/file.h +++ b/security/apparmor/include/file.h @@ -101,9 +101,6 @@ static inline struct aa_label *aa_get_file_label(struct aa_file_ctx *ctx) #define AA_X_INHERIT 0x4000 #define AA_X_UNCONFINED 0x8000 -/* AA_SECURE_X_NEEDED - is passed in the bprm->unsafe field */ -#define AA_SECURE_X_NEEDED 0x8000 - /* need to make conditional which ones are being set */ struct path_cond { kuid_t uid; diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c index 867bcd154c7e..7a82c0f61452 100644 --- a/security/apparmor/lsm.c +++ b/security/apparmor/lsm.c @@ -694,7 +694,6 @@ static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(bprm_set_creds, apparmor_bprm_set_creds), LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds), LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds), - LSM_HOOK_INIT(bprm_secureexec, apparmor_bprm_secureexec), LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit), }; -- 2.20.1