From: keescook@chromium.org (Kees Cook)
To: linux-security-module@vger.kernel.org
Subject: [PATCH v2 6/8] exec: Consolidate dumpability logic
Date: Mon, 10 Jul 2017 00:57:29 -0700 [thread overview]
Message-ID: <1499673451-66160-7-git-send-email-keescook@chromium.org> (raw)
In-Reply-To: <1499673451-66160-1-git-send-email-keescook@chromium.org>
Since it's already valid to set dumpability in the early part of
setup_new_exec(), we can consolidate the logic into a single place.
The BINPRM_FLAGS_ENFORCE_NONDUMP is set during would_dump() calls
before setup_new_exec(), so its test is safe to move as well.
Signed-off-by: Kees Cook <keescook@chromium.org>
---
fs/exec.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)
diff --git a/fs/exec.c b/fs/exec.c
index d7bda5b60e7b..eeb8323977d1 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1346,10 +1346,12 @@ void setup_new_exec(struct linux_binprm * bprm)
current->sas_ss_sp = current->sas_ss_size = 0;
- if (!bprm->secureexec)
- set_dumpable(current->mm, SUID_DUMP_USER);
- else
+ /* Figure out dumpability. */
+ if (bprm->interp_flags & BINPRM_FLAGS_ENFORCE_NONDUMP ||
+ bprm->secureexec)
set_dumpable(current->mm, suid_dumpable);
+ else
+ set_dumpable(current->mm, SUID_DUMP_USER);
arch_setup_new_exec();
perf_event_exec();
@@ -1363,9 +1365,6 @@ void setup_new_exec(struct linux_binprm * bprm)
if (bprm->secureexec) {
current->pdeath_signal = 0;
- } else {
- if (bprm->interp_flags & BINPRM_FLAGS_ENFORCE_NONDUMP)
- set_dumpable(current->mm, suid_dumpable);
}
/* An exec changes our domain. We are no longer part of the thread
--
2.7.4
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next prev parent reply other threads:[~2017-07-10 7:57 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-10 7:57 [PATCH v2 0/8] exec: Use sane stack rlimit under secureexec Kees Cook
2017-07-10 7:57 ` [PATCH v2 1/8] exec: Correct comments about "point of no return" Kees Cook
2017-07-10 8:46 ` Eric W. Biederman
2017-07-10 16:04 ` Kees Cook
[not found] ` <87pod8mdad.fsf@xmission.com>
2017-07-18 6:39 ` Kees Cook
2017-07-18 13:12 ` Eric W. Biederman
2017-07-18 13:42 ` Kees Cook
2017-07-10 7:57 ` [PATCH v2 2/8] exec: Move security_bprm_secureexec() earlier Kees Cook
2017-07-10 8:57 ` Eric W. Biederman
2017-07-10 16:06 ` Kees Cook
[not found] ` <87bmosmcqv.fsf@xmission.com>
2017-07-11 2:07 ` Kees Cook
2017-07-18 6:45 ` Kees Cook
2017-07-10 7:57 ` [PATCH v2 3/8] exec: Use secureexec for setting dumpability Kees Cook
2017-07-10 7:57 ` [PATCH v2 4/8] exec: Use secureexec for clearing pdeath_signal Kees Cook
2017-07-10 7:57 ` [PATCH v2 5/8] smack: Remove redundant pdeath_signal clearing Kees Cook
2017-07-10 7:57 ` Kees Cook [this message]
2017-07-10 7:57 ` [PATCH v2 7/8] exec: Consolidate " Kees Cook
2017-07-10 7:57 ` [PATCH v2 8/8] exec: Use sane stack rlimit under secureexec Kees Cook
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