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exec: Consolidate dumpability logic

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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>
Acked-by: Serge Hallyn <serge@hallyn.com>
Reviewed-by: James Morris <james.l.morris@oracle.com>
This commit is contained in:
Kees Cook 2017-07-18 15:25:34 -07:00
parent 35b372b76f
commit 473d89639d
1 changed files with 5 additions and 6 deletions
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11
fs/exec.c
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@ -1354,10 +1354,12 @@ 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();
@ -1371,9 +1373,6 @@ 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