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Subject[PATCH v3 13/15] exec: Consolidate dumpability logic
Date
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 81793a193d92..45418d6ec583 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1353,10 +1353,12 @@ 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();
@@ -1370,9 +1372,6 @@ 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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