linux-hardening - Coverity: __do_sys_pidfd_send

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Message-ID: <202402131559.B76A34B@keescook>
Date: Tue, 13 Feb 2024 15:59:37 -0800
From: coverity-bot <keescook@...omium.org>
To: Oleg Nesterov <oleg@...hat.com>, Christian Brauner <brauner@...nel.org>
Cc: Nicholas Piggin <npiggin@...il.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Peng Zhang <zhangpeng.00@...edance.com>,
	Oleg Nesterov <oleg@...hat.com>, Ard Biesheuvel <ardb@...nel.org>,
	Luis Chamberlain <mcgrof@...nel.org>,
	Christian Brauner <brauner@...nel.org>,
	Heiko Carstens <hca@...ux.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mateusz Guzik <mjguzik@...il.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Tycho Andersen <tycho@...ho.pizza>,
	Tycho Andersen <tandersen@...flix.com>,
	Mike Christie <michael.christie@...cle.com>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	linux-kernel@...r.kernel.org,
	"Gustavo A. R. Silva" <gustavo@...eddedor.com>,
	linux-next@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Coverity: __do_sys_pidfd_send_signal(): UNINIT

Hello!

This is an experimental semi-automated report about issues detected by
Coverity from a scan of next-20240213 as part of the linux-next scan project:
https://scan.coverity.com/projects/linux-next-weekly-scan

You're getting this email because you were associated with the identified
lines of code (noted below) that were touched by commits:

  Sat Feb 10 22:37:25 2024 +0100
    3f643cd23510 ("pidfd: allow to override signal scope in pidfd_send_signal()")
  Sat Feb 10 22:37:23 2024 +0100
    81b9d8ac0640 ("pidfd: change pidfd_send_signal() to respect PIDFD_THREAD")

Coverity reported the following:

*** CID 1583637:    (UNINIT)
kernel/signal.c:3963 in __do_sys_pidfd_send_signal()
3957     		/* Only allow sending arbitrary signals to yourself. */
3958     		ret = -EPERM;
3959     		if ((task_pid(current) != pid) &&
3960     		    (kinfo.si_code >= 0 || kinfo.si_code == SI_TKILL))
3961     			goto err;
3962     	} else {
vvv     CID 1583637:    (UNINIT)
vvv     Using uninitialized value "type" when calling "prepare_kill_siginfo".
3963     		prepare_kill_siginfo(sig, &kinfo, type);
3964     	}
3965
3966     	if (type == PIDTYPE_PGID)
3967     		ret = kill_pgrp_info(sig, &kinfo, pid);
3968     	else
kernel/signal.c:3966 in __do_sys_pidfd_send_signal()
3960     		    (kinfo.si_code >= 0 || kinfo.si_code == SI_TKILL))
3961     			goto err;
3962     	} else {
3963     		prepare_kill_siginfo(sig, &kinfo, type);
3964     	}
3965
vvv     CID 1583637:    (UNINIT)
vvv     Using uninitialized value "type".
3966     	if (type == PIDTYPE_PGID)
3967     		ret = kill_pgrp_info(sig, &kinfo, pid);
3968     	else
3969     		ret = kill_pid_info_type(sig, &kinfo, pid, type);
3970     err:
3971     	fdput(f);

If this is a false positive, please let us know so we can mark it as
such, or teach the Coverity rules to be smarter. If not, please make
sure fixes get into linux-next. :) For patches fixing this, please
include these lines (but double-check the "Fixes" first):

Reported-by: coverity-bot <keescook+coverity-bot@...omium.org>
Addresses-Coverity-ID: 1583637 ("UNINIT")
Fixes: 3f643cd23510 ("pidfd: allow to override signal scope in pidfd_send_signal()")
Fixes: 81b9d8ac0640 ("pidfd: change pidfd_send_signal() to respect PIDFD_THREAD")

Thanks for your attention!

(Human note: looks like a default case is needed in the switch
statement.)

-- 
Coverity-bot