| Message ID | 1779aa46278bf6b03052c2d4a59d68a996fd61a0.1494527628.git.rgb@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
diff --git a/security/commoncap.c b/security/commoncap.c index c0adee6..6309e81 100644 --- a/security/commoncap.c +++ b/security/commoncap.c @@ -608,7 +608,9 @@ int cap_bprm_set_creds(struct linux_binprm *bprm) * Number 1 above might fail if you don't have a full bset, but I think * that is interesting information to audit. */ - if (pESET && !(pEALL && (EROOT || RROOT) && SROOT) ) { + if ( (pESET && !(pEALL && (EROOT || RROOT) && SROOT) ) + || (SROOT && SETUIDROOT && !pEALL) + || (!SUID && ( (has_cap && pPADD) || pAADD) )) { ret = audit_log_bprm_fcaps(bprm, new, old); if (ret < 0) return ret;
The existing condition tested for process effective capabilities set by file attributes but intended to ignore the change if the result was unsurprisingly an effective full set in the case root is special with a setuid root executable file and we are root. Stated again: - When you execute a setuid root application, it is no surprise and expected that it got all capabilities, so we do not want capabilities recorded. if (pESET && !(pEALL && (EROOT || RROOT) && SROOT) ) Now make sure we cover other cases: - If something prevented a setuid root app getting all capabilities and it wound up with one capability only, then it is a surprise and should be logged. When it is a setuid root file, we only want capabilities when the process does not get full capabilities.. SROOT && SETUIDROOT && !pEALL - Similarly if a non-setuid program does pick up capabilities due to file system based capabilities, then we want to know what capabilities were picked up. When it has file system based capabilities we want the capabilities. !SUID && FILECAP && pPADD - If it is a non-setuid file and it gets ambient capabilities, we want the capabilities. !SUID && pAADD Related: https://github.com/linux-audit/audit-kernel/issues/16 Signed-off-by: Richard Guy Briggs <rgb@redhat.com> --- security/commoncap.c | 4 +++- 1 files changed, 3 insertions(+), 1 deletions(-)