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authorKees Cook <keescook@chromium.org>2017-07-19 01:25:31 +0300
committerKees Cook <keescook@chromium.org>2017-08-01 22:03:10 +0300
commite37fdb785a5f95ecadf43b773c97f676500ac7b8 (patch)
treeda2a0c619be4777fbfb33caf5078a9453782fd9d /fs/exec.c
parent2af622802696e1dbe28d81c8ea6355dc30800396 (diff)
downloadlinux-e37fdb785a5f95ecadf43b773c97f676500ac7b8.tar.xz
exec: Use secureexec for setting dumpability
The examination of "current" to decide dumpability is wrong. This was a check of and euid/uid (or egid/gid) mismatch in the existing process, not the newly created one. This appears to stretch back into even the "history.git" tree. Luckily, dumpability is later set in commit_creds(). In earlier kernel versions before creds existed, similar checks also existed late in the exec flow, covering up the mistake as far back as I could find. Note that because the commit_creds() check examines differences of euid, uid, egid, gid, and capabilities between the old and new creds, it would look like the setup_new_exec() dumpability test could be entirely removed. However, the secureexec test may cover a different set of tests (specific to the LSMs) than what commit_creds() checks for. So, fix this test to use secureexec (the removed euid tests are redundant to the commoncap secureexec checks now). Cc: David Howells <dhowells@redhat.com> Signed-off-by: Kees Cook <keescook@chromium.org> Acked-by: Serge Hallyn <serge@hallyn.com> Reviewed-by: James Morris <james.l.morris@oracle.com>
Diffstat (limited to 'fs/exec.c')
-rw-r--r--fs/exec.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/exec.c b/fs/exec.c
index eca0cb550a06..3536437ffd76 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1354,7 +1354,7 @@ void setup_new_exec(struct linux_binprm * bprm)
current->sas_ss_sp = current->sas_ss_size = 0;
- if (uid_eq(current_euid(), current_uid()) && gid_eq(current_egid(), current_gid()))
+ if (!bprm->secureexec)
set_dumpable(current->mm, SUID_DUMP_USER);
else
set_dumpable(current->mm, suid_dumpable);