From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2DD75449ED6; Thu, 30 Jul 2026 16:17:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785428249; cv=none; b=dMN0C0pubWntXJ8uHPXUzYR0wJEjxTMdxUFg0Y185GlP5dXdXLUHdvzsIlyZGyQsDUzeiVFuVZx69/VHEuG81sWFUr8xuRGdcnLwb5C2X37GI5SW6ytH957ZZ4TO6fl/aiWChiTTREclVJkZ0rZZYkLeaBza/y0KqCvdqj4sl08= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785428249; c=relaxed/simple; bh=MAc1STfNG+aubb6fLR8Gbs+OicmjKA1os/dtTK73+1Q=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rz7l6DhQ00k2SwucM9TSOHu/duzXgeE5Uc8BcC1eFwFtX3wHJNSse46L2bKu4jrygwSBzyzjRjHmCVrpg4/sixCAFJbMbEHZdzmP1g0W/7ts8FSD+c2EFjgVRSWDU8fUtHZ/ADK3DXL2dYfhBuzgbEO1S9z0SFIKAM0L3PUz3/k= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=q0Ws8gz1; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="q0Ws8gz1" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3CE561F000E9; Thu, 30 Jul 2026 16:17:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1785428247; bh=udnOdBrH9e6fuyieGfm6a0btB+Yw6FyaWFTWf7zX5ro=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=q0Ws8gz1D0C99JpLlp+OUY0+khNV+klpVMOYKuVc4abRct3ScHO+zXTmlHx87CyYl sdzIHMkk7S8pUHmSJwWXGjRJf8rF3ahRPDOpbbJuiRQwj33Da7lyGESP3YnD1SKzL1 JKSMdHz21JtjQJLVGZovZe+D6aDJ/vzBGSXfRHCM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, XIAO WU , Beau Belgrave , Michael Bommarito , Steven Rostedt , Sasha Levin Subject: [PATCH 6.6 454/484] tracing/user_events: Fix use-after-free in user_event_mm_dup() Date: Thu, 30 Jul 2026 16:15:51 +0200 Message-ID: <20260730141433.345066057@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260730141423.392222816@linuxfoundation.org> References: <20260730141423.392222816@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Michael Bommarito [ Upstream commit 50fd6dd755c6e48a38af2fa4621167eea56829c2 ] user_event_mm_dup() walks the parent mm's enabler list locklessly under rcu_read_lock() during fork() (from copy_process()); it does not take event_mutex: rcu_read_lock(); list_for_each_entry_rcu(enabler, &old_mm->enablers, mm_enablers_link) enabler->event = user_event_get(orig->event); user_event_enabler_destroy() removes an enabler from that list with list_del_rcu() and then, without waiting for a grace period, drops the enabler's user_event reference with user_event_put() and frees the enabler with kfree(). A reader that loaded the enabler before the list_del_rcu() can still be walking it, which leads to two use-after-frees: - kfree(enabler) frees the enabler while that reader dereferences enabler->event. - user_event_put() may drop the last reference to the user_event, which is then freed (via delayed_destroy_user_event() on a work queue), while the same reader does user_event_get(orig->event) on it. Both are reachable by an unprivileged task that can open user_events_data: one multithreaded process that registers an enabler and then concurrently unregisters it and calls fork() triggers the race. KASAN reports a slab-use-after-free in user_event_mm_dup() during clone(), with a "refcount_t: addition on 0" warning when the user_event is freed. The enabler use-after-free was found first; the user_event one was reported by XIAO WU, and the earlier enabler-only fix did not address it. Defer both the user_event_put() and the kfree(enabler) to a work item queued with queue_rcu_work(), so they run only after an RCU grace period, once all readers walking the enabler list have finished. The put must run in process context because user_event_put() takes event_mutex on the last reference, so a work queue is used rather than call_rcu(). The now-unlocked put lets the locked argument of user_event_enabler_destroy() be removed; all callers are updated. Fixes: 7235759084a4 ("tracing/user_events: Use remote writes for event enablement") Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260707165912.2560537-2-michael.bommarito@gmail.com Reported-by: XIAO WU Closes: https://lore.kernel.org/all/tencent_89647CE40DC452B891C65C94D1B271DE8E07@qq.com/ Suggested-by: Beau Belgrave Assisted-by: Claude:claude-opus-4-8 Signed-off-by: Michael Bommarito Signed-off-by: Steven Rostedt Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- kernel/trace/trace_events_user.c | 39 ++++++++++++++++++++++++++++++++------- 1 file changed, 32 insertions(+), 7 deletions(-) --- a/kernel/trace/trace_events_user.c +++ b/kernel/trace/trace_events_user.c @@ -104,6 +104,9 @@ struct user_event_enabler { /* Track enable bit, flags, etc. Aligned for bitops. */ unsigned long values; + + /* Defer the event put and enabler free past an RCU grace period. */ + struct rcu_work put_rwork; }; /* Bits 0-5 are for the bit to update upon enable/disable (0-63 allowed) */ @@ -378,17 +381,39 @@ error: return NULL; }; -static void user_event_enabler_destroy(struct user_event_enabler *enabler, - bool locked) +static void delayed_user_event_enabler_put(struct work_struct *work) { - list_del_rcu(&enabler->mm_enablers_link); + struct user_event_enabler *enabler = container_of(to_rcu_work(work), + struct user_event_enabler, put_rwork); /* No longer tracking the event via the enabler */ - user_event_put(enabler->event, locked); + user_event_put(enabler->event, false); + /* Run from queue_rcu_work(), the RCU grace period has elapsed */ kfree(enabler); } +static void user_event_enabler_destroy(struct user_event_enabler *enabler) +{ + list_del_rcu(&enabler->mm_enablers_link); + + /* + * The enabler is removed from an RCU-traversed list + * (user_event_mm_dup() walks mm->enablers under rcu_read_lock() only), + * and readers there dereference enabler->event and take a new ref on + * it. Both the put of that event reference and the free of the enabler + * therefore have to wait for a grace period so no reader can be looking + * at the enabler or racing the last put of its event. + * + * The put itself must not run in RCU context: when it drops the last + * reference user_event_put() takes event_mutex, which cannot be taken + * from a softirq/RCU callback. Defer both to a work item scheduled + * after a grace period via queue_rcu_work(). + */ + INIT_RCU_WORK(&enabler->put_rwork, delayed_user_event_enabler_put); + queue_rcu_work(system_percpu_wq, &enabler->put_rwork); +} + static int user_event_mm_fault_in(struct user_event_mm *mm, unsigned long uaddr, int attempt) { @@ -446,7 +471,7 @@ static void user_event_enabler_fault_fix /* User asked for enabler to be removed during fault */ if (test_bit(ENABLE_VAL_FREEING_BIT, ENABLE_BITOPS(enabler))) { - user_event_enabler_destroy(enabler, true); + user_event_enabler_destroy(enabler); goto out; } @@ -746,7 +771,7 @@ static void user_event_mm_destroy(struct struct user_event_enabler *enabler, *next; list_for_each_entry_safe(enabler, next, &mm->enablers, mm_enablers_link) - user_event_enabler_destroy(enabler, false); + user_event_enabler_destroy(enabler); mmdrop(mm->mm); kfree(mm); @@ -2579,7 +2604,7 @@ static long user_events_ioctl_unreg(unsi flags |= enabler->values & ENABLE_VAL_COMPAT_MASK; if (!test_bit(ENABLE_VAL_FAULTING_BIT, ENABLE_BITOPS(enabler))) - user_event_enabler_destroy(enabler, true); + user_event_enabler_destroy(enabler); /* Removed at least one */ ret = 0;