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exec: Weaken dumpability for secureexec

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This is a logical revert of commit e37fdb785a ("exec: Use secureexec
for setting dumpability")

This weakens dumpability back to checking only for uid/gid changes in
current (which is useless), but userspace depends on dumpability not
being tied to secureexec.

  https://bugzilla.redhat.com/show_bug.cgi?id=1528633

Reported-by: Tom Horsley <horsley1953@gmail.com>
Fixes: e37fdb785a ("exec: Use secureexec for setting dumpability")
Cc: stable@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kees Cook 2018-01-02 15:21:33 -08:00 committed by Linus Torvalds
parent 30a7acd573
commit e816c201ae
1 changed files with 7 additions and 2 deletions
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9
fs/exec.c
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@ -1349,9 +1349,14 @@ void setup_new_exec(struct linux_binprm * bprm)
current->sas_ss_sp = current->sas_ss_size = 0;
/* Figure out dumpability. */
/*
* Figure out dumpability. Note that this checking only of current
* is wrong, but userspace depends on it. This should be testing
* bprm->secureexec instead.
*/
if (bprm->interp_flags & BINPRM_FLAGS_ENFORCE_NONDUMP ||
bprm->secureexec)
!(uid_eq(current_euid(), current_uid()) &&
gid_eq(current_egid(), current_gid())))
set_dumpable(current->mm, suid_dumpable);
else
set_dumpable(current->mm, SUID_DUMP_USER);