From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=91.218.175.55 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793205462; b=h78bmfZl7B6iFk5lYji3rEUaoIfUg39yhMHfBfHNA3PymEJFt+vY5UZP+uwMWdSjUPlI Gxmes1X8DmzZH+Ve0vnt4aS7srFslHXD+dk1BMSrHemgNjYnp0BaEC9QNVVFeb5Wdk8A+ 7r5JT5wQVd6zb1gAQ3i1hkMJ9tsBLeodmdZKMoPZHD1qfadbOdQ4gbRkwixV3PwO25W3G jZhcUzDmKSWqK2qzFTImhpzYNgYHWHPgXg/OlfU1wZMVhhBnaOPZ7L3i8XN4pmtR4BAVd bwTkbaZgX5Ekjltzz2V9WEx8TqM7xSVT/lOwfx7mQWwep7yuuekKQvy/+6L297NvO7A== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793205462; h=DMARC-Filter:X-Envelope-To:DKIM-Signature:X-Envelope-To:Received: X-Mizu-Trace-ID:X-Migadu-Flow:From:To:Cc:Subject:Date:Message-Id: X-Mailer:In-Reply-To:References:MIME-Version: Content-Transfer-Encoding; bh=SqM50gwZk5ptix9XnePs8qcNm7vgVdEevevn7ejFQz0=; b=m36MQIJrQBdiS9IP+gGDscPAb4/NggamdW0/E+w4s+FbcUiljLAJrr5GaUAQfqneQYP6 UAr29nkokw4qPDXPXzCMfDgQCThAHRpuGuIIBDmIQtHX4Pfi3uoZ5fDdk2nLoF/JX+LlC RE+jmYBeI8Uo313NrpYh/uC9DPD7VbyjhCad9os1Oe/eunS/sdNn6l0oJw8uk9vLmAbH3 XoBdGHtNIjXnXeTVo4NQCeA0YeDlrFkCAFw15rgXoDrOf0BSv55D1OWBQXMC3weMrBPvc M6lOrr3AUoG5X1nc99aK+mkSxnBei5rB4DIr23X7fEOaekCnRfFu0eA0cR57E9AMAtQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=FBM3J2K4; arc=none smtp.remote-ip=91.218.175.55 Received: from mta0.migadu.com (out-55.mta0.migadu.com [91.218.175.55]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3F69C60A2634 for ; Wed, 28 Oct 2026 16:37:41 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 3F69C60A2634 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=FBM3J2K4 X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=tIQ+v/B2SyEXleKz6qMVgW24J9srP1mrR/8iPTLZ/XY=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1793205460; v=1; x=1793810260; b=FBM3J2K4up2xZwZ7BpEvzfY8tgKeR2qDXA0/RaMyvgo7eAxYVPOUrgmGbS/aBm6b8HCZxh4i o8prFrZNziR7TSWulEpQp55Xzi9v/MuQlRvvBrutQN5YpwkH5CrV3qB3LJ/+s1EIthS5ZvJp/JL mHsGxda0++zVJcV4zxfw6cPM= X-Envelope-To: linux-kernel@vger.kernel.org Received: by mta11.migadu.com with ESMTPS id 9729f73877369648; Wed, 28 Oct 2026 16:37:40 +0000 X-Mizu-Trace-ID: 9729f73877369648 X-Migadu-Flow: FLOW_OUT From: wen.yang@linux.dev To: Joel Granados Cc: Wen Yang , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH 23/39] yama: preserve scope locking with numeric sysctl bounds Date: Thu, 29 Oct 2026 00:35:02 +0800 Message-Id: <9eb2f86f804bc3479d711a685be6308e515c59d3.1793204511.git.wen.yang@linux.dev> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Wen Yang Set the numeric minimum to the maximum when ptrace scope is locked. Suggested-by: Joel Granados Signed-off-by: Wen Yang --- security/yama/yama_lsm.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) diff --git a/security/yama/yama_lsm.c b/security/yama/yama_lsm.c index cef3776cf3b2..aa4deec29919 100644 --- a/security/yama/yama_lsm.c +++ b/security/yama/yama_lsm.c @@ -439,14 +439,12 @@ static int yama_dointvec_minmax(const struct ctl_table *table, int write, /* Lock the max value if it ever gets set. */ table_copy = *table; - if (*(int *)table_copy.data == *(int *)table_copy.extra2) - table_copy.extra1 = table_copy.extra2; + if (READ_ONCE(*(int *)table_copy.data) == (int)table_copy.max) + table_copy.min = table_copy.max; return proc_dointvec_minmax(&table_copy, write, buffer, lenp, ppos); } -static int max_scope = YAMA_SCOPE_NO_ATTACH; - static const struct ctl_table yama_sysctl_table[] = { { .procname = "ptrace_scope", @@ -454,8 +452,8 @@ static const struct ctl_table yama_sysctl_table[] = { .maxlen = sizeof(int), .mode = 0644, .proc_handler = yama_dointvec_minmax, - .extra1 = SYSCTL_ZERO, - .extra2 = &max_scope, + .min = 0, + .max = YAMA_SCOPE_NO_ATTACH, }, }; static void __init yama_init_sysctl(void) -- 2.25.1