diff options
Diffstat (limited to 'security/commoncap.c')
| -rw-r--r-- | security/commoncap.c | 20 |
1 files changed, 8 insertions, 12 deletions
diff --git a/security/commoncap.c b/security/commoncap.c index 28d4248bf001..6bd4adeb4795 100644 --- a/security/commoncap.c +++ b/security/commoncap.c @@ -856,12 +856,6 @@ static void handle_privileged_root(struct linux_binprm *bprm, bool has_fcap, #define __cap_full(field, cred) \ cap_issubset(CAP_FULL_SET, cred->cap_##field) -static inline bool __is_setuid(struct cred *new, const struct cred *old) -{ return !uid_eq(new->euid, old->uid); } - -static inline bool __is_setgid(struct cred *new, const struct cred *old) -{ return !gid_eq(new->egid, old->gid); } - /* * 1) Audit candidate if current->cap_effective is set * @@ -891,7 +885,7 @@ static inline bool nonroot_raised_pE(struct cred *new, const struct cred *old, (root_privileged() && __is_suid(root, new) && !__cap_full(effective, new)) || - (!__is_setuid(new, old) && + (uid_eq(new->euid, old->euid) && ((has_fcap && __cap_gained(permitted, new, old)) || __cap_gained(ambient, new, old)))) @@ -917,7 +911,7 @@ int cap_bprm_creds_from_file(struct linux_binprm *bprm, const struct file *file) /* Process setpcap binaries and capabilities for uid 0 */ const struct cred *old = current_cred(); struct cred *new = bprm->cred; - bool effective = false, has_fcap = false, is_setid; + bool effective = false, has_fcap = false, id_changed; int ret; kuid_t root_uid; @@ -941,9 +935,9 @@ int cap_bprm_creds_from_file(struct linux_binprm *bprm, const struct file *file) * * In addition, if NO_NEW_PRIVS, then ensure we get no new privs. */ - is_setid = __is_setuid(new, old) || __is_setgid(new, old); + id_changed = !uid_eq(new->euid, old->euid) || !in_group_p(new->egid); - if ((is_setid || __cap_gained(permitted, new, old)) && + if ((id_changed || __cap_gained(permitted, new, old)) && ((bprm->unsafe & ~LSM_UNSAFE_PTRACE) || !ptracer_capable(current, new->user_ns))) { /* downgrade; they get no more than they had, and maybe less */ @@ -960,7 +954,7 @@ int cap_bprm_creds_from_file(struct linux_binprm *bprm, const struct file *file) new->sgid = new->fsgid = new->egid; /* File caps or setid cancels ambient. */ - if (has_fcap || is_setid) + if (has_fcap || id_changed) cap_clear(new->cap_ambient); /* @@ -993,7 +987,9 @@ int cap_bprm_creds_from_file(struct linux_binprm *bprm, const struct file *file) return -EPERM; /* Check for privilege-elevated exec. */ - if (is_setid || + if (id_changed || + !uid_eq(new->euid, old->uid) || + !gid_eq(new->egid, old->gid) || (!__is_real(root_uid, new) && (effective || __cap_grew(permitted, ambient, new)))) |