From patchwork Sat Mar 22 10:52:00 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: pwn9uin@gmail.com X-Patchwork-Id: 14026310 X-Patchwork-Delegate: kuba@kernel.org Received: from mail-pj1-f43.google.com (mail-pj1-f43.google.com [209.85.216.43]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E72A41EFF83 for ; Sat, 22 Mar 2025 10:52:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.43 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742640741; cv=none; b=mXIyuGNpy+7eLAd5c7XHw76tNbcu2xivv/HuDDtrnOLdHO9QiiKDfv7a70d4TIAmAmuYN9GMH1je0CsVRfQ9rYIaGyYMOBXEVjCUjYEE6dvzbPGdIQ/6/5lero6+md64CUmelGRKoiEuyOVEGSkPy5u4DTMPKqNMqpyV0cDnZVo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742640741; c=relaxed/simple; bh=M2VDDgrzF/hgLNIG7RpPOfNLqJwvWD552v/vlOPqxsk=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=phE7ep6d20tosOORq0S9KXbC9Y1kskNDoFImlC/IR2xhlcCFXL7W3Bcx0/BDD2A9mPoUZWbgtVDY6AWCqqGHNCCzkzk9LdWAH/nyvoFOUDXNTSfvCT4B/nZoLDc8uB7XNFCbsnDQrH8oVn6oIuTEYr/KfJKFkT4DgWzZRFdjlBA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=YG5KKV26; arc=none smtp.client-ip=209.85.216.43 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="YG5KKV26" Received: by mail-pj1-f43.google.com with SMTP id 98e67ed59e1d1-3014ae35534so4370508a91.0 for ; Sat, 22 Mar 2025 03:52:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1742640739; x=1743245539; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=3PtaB9Ju3vFH0DuMHjQEmuihGRgL+PmPeKk6ZAxmuEs=; b=YG5KKV26fVsLyqzb8DATtAgKVVhRL2hOlHvQcPOCP6YNbBXPVNP8wAyoMloXiDGyy2 t23PUyioCLSdFeGSoDBD0jWUjArfvCKYNTmNkkGx3BoVIPBfDClQKODIift8O2uZ0gCv Nnf0q401KEwSwNEaEtLktCUDEuOBJaZCdrLgqeZWOKpiaigSfnPKVYMMoQzZ4iaKSwiP Nk3XKABrg3Y7813rn8i30c6G659QNlalwuMhohFTCxt3XOg3jIvt9xdU3TQJox9z00Ax IFLvmuvYHosK3odbojyWi1FCZy+i2JyZ68c9GiD9tetUKq9Sj0CNKtX42Um6k2O3yChS zGWw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1742640739; x=1743245539; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=3PtaB9Ju3vFH0DuMHjQEmuihGRgL+PmPeKk6ZAxmuEs=; b=jgXkDGg/+SanfqHEzRuZkweUr5ZUCJXjX7VKicNIr3wy5MDoN+pD6qFq2zgNk9/1Y8 15fgj3aTvDNB0sbYuvlbsXCiT+q0SRg4YsGO0Brw4DKbip0sQrRd29hXqe3Biph6ezd5 3M2Ep5KjKBafpsDhbKxwcWXOIZWBQ6dbaN5/SyKbzQOjaDcXPE+CapQHgjlibD07OPLd LeYEiuZTW8ZRlZ5IHprrNCoQGXUis69WXYZq4U5JF+QpUiWiPbAd+3HaIQYFAs//1P/0 25T+pX2DVlO1JFhdOIFY5vgaSFm9/q51PLF9XanzzJQVEb45WdDdnin2x22jXc5r8DZg bQOg== X-Forwarded-Encrypted: i=1; AJvYcCUYCOQLA1Uftd8/cM3K4Uy9JfyiXOT/tnqppyTAfvxyMqGceuDpTi5ihdoJQrYtPOZsW8Wcano=@vger.kernel.org X-Gm-Message-State: AOJu0Yyng0a7MprDrbbVvK+R73iE0yBpIAjzKFS8BDrKrxevgS1Rp3Et mSXT9OrnO450i6Tx+e7MSIRr7Msqr1KWqsjtc551muQWfOU2q+a8 X-Gm-Gg: ASbGncsI69jdzO09+qAe/Yol6sScIf2CutHtr3+e+kC2skQCZWP6hvtXS/9z/kSmLCc LCQ+AEpdQIT8k0EUhs19TDEQeMPff90mj/4EEmh8diCtn4JPtcXxQahj3V15UpbFfmcMhJ/Tu3R gGLh2FAErQHb3VOgOI5tb/5U8v1MEpa6MZ/RZGDl/nopCbWavE413njinXucoWpbJQnhTAGg1ul YpvzwhrY0RpeCMfdRZGazzr9/eQHpOb4cDbIsUh7olAtA2NQH8icMoGx3BolQnRtOqBNNnUHGnn hrzm+z6sHfuh6xkTgttN0175Ri5FqZF8qcoE3A8xEYHnDgHq/2OROGvzJtLe3olk/kc= X-Google-Smtp-Source: AGHT+IHsiWDf899njCBFRTebEtxecXTxqvAuszDt0ODHuPoHrNU8xJvrD8cEEpoY5rdffxtSnWTwLQ== X-Received: by 2002:a17:90b:1dd2:b0:301:1bce:c26f with SMTP id 98e67ed59e1d1-3030fe8d558mr9297897a91.3.1742640738731; Sat, 22 Mar 2025 03:52:18 -0700 (PDT) Received: from localhost.localdomain ([125.177.169.241]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-301bf636029sm7904519a91.42.2025.03.22.03.52.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 22 Mar 2025 03:52:18 -0700 (PDT) From: pwn9uin@gmail.com To: "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: Simon Horman , netdev@vger.kernel.org, Minjoong Kim Subject: [PATCH net v2] atm: Fix NULL pointer dereference Date: Sat, 22 Mar 2025 10:52:00 +0000 Message-Id: <20250322105200.14981-1-pwn9uin@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org From: Minjoong Kim When MPOA_cache_impos_rcvd() receives the msg, it can trigger Null Pointer Dereference Vulnerability if both entry and holding_time are NULL. Because there is only for the situation where entry is NULL and holding_time exists, it can be passed when both entry and holding_time are NULL. If these are NULL, the entry will be passd to eg_cache_put() as parameter and it is referenced by entry->use code in it. kasan log: [ 3.316691] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006:I [ 3.317568] KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] [ 3.318188] CPU: 3 UID: 0 PID: 79 Comm: ex Not tainted 6.14.0-rc2 #102 [ 3.318601] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 [ 3.319298] RIP: 0010:eg_cache_remove_entry+0xa5/0x470 [ 3.319677] Code: c1 f7 6e fd 48 c7 c7 00 7e 38 b2 e8 95 64 54 fd 48 c7 c7 40 7e 38 b2 48 89 ee e80 [ 3.321220] RSP: 0018:ffff88800583f8a8 EFLAGS: 00010006 [ 3.321596] RAX: 0000000000000006 RBX: ffff888005989000 RCX: ffffffffaecc2d8e [ 3.322112] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000030 [ 3.322643] RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff6558b88 [ 3.323181] R10: 0000000000000003 R11: 203a207972746e65 R12: 1ffff11000b07f15 [ 3.323707] R13: dffffc0000000000 R14: ffff888005989000 R15: ffff888005989068 [ 3.324185] FS: 000000001b6313c0(0000) GS:ffff88806d380000(0000) knlGS:0000000000000000 [ 3.325042] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 3.325545] CR2: 00000000004b4b40 CR3: 000000000248e000 CR4: 00000000000006f0 [ 3.326430] Call Trace: [ 3.326725] [ 3.326927] ? die_addr+0x3c/0xa0 [ 3.327330] ? exc_general_protection+0x161/0x2a0 [ 3.327662] ? asm_exc_general_protection+0x26/0x30 [ 3.328214] ? vprintk_emit+0x15e/0x420 [ 3.328543] ? eg_cache_remove_entry+0xa5/0x470 [ 3.328910] ? eg_cache_remove_entry+0x9a/0x470 [ 3.329294] ? __pfx_eg_cache_remove_entry+0x10/0x10 [ 3.329664] ? console_unlock+0x107/0x1d0 [ 3.329946] ? __pfx_console_unlock+0x10/0x10 [ 3.330283] ? do_syscall_64+0xa6/0x1a0 [ 3.330584] ? entry_SYSCALL_64_after_hwframe+0x47/0x7f [ 3.331090] ? __pfx_prb_read_valid+0x10/0x10 [ 3.331395] ? down_trylock+0x52/0x80 [ 3.331703] ? vprintk_emit+0x15e/0x420 [ 3.331986] ? __pfx_vprintk_emit+0x10/0x10 [ 3.332279] ? down_trylock+0x52/0x80 [ 3.332527] ? _printk+0xbf/0x100 [ 3.332762] ? __pfx__printk+0x10/0x10 [ 3.333007] ? _raw_write_lock_irq+0x81/0xe0 [ 3.333284] ? __pfx__raw_write_lock_irq+0x10/0x10 [ 3.333614] msg_from_mpoad+0x1185/0x2750 [ 3.333893] ? __build_skb_around+0x27b/0x3a0 [ 3.334183] ? __pfx_msg_from_mpoad+0x10/0x10 [ 3.334501] ? __alloc_skb+0x1c0/0x310 [ 3.334809] ? __pfx___alloc_skb+0x10/0x10 [ 3.335283] ? _raw_spin_lock+0xe0/0xe0 [ 3.335632] ? finish_wait+0x8d/0x1e0 [ 3.335975] vcc_sendmsg+0x684/0xba0 [ 3.336250] ? __pfx_vcc_sendmsg+0x10/0x10 [ 3.336587] ? __pfx_autoremove_wake_function+0x10/0x10 [ 3.337056] ? fdget+0x176/0x3e0 [ 3.337348] __sys_sendto+0x4a2/0x510 [ 3.337663] ? __pfx___sys_sendto+0x10/0x10 [ 3.337969] ? ioctl_has_perm.constprop.0.isra.0+0x284/0x400 [ 3.338364] ? sock_ioctl+0x1bb/0x5a0 [ 3.338653] ? __rseq_handle_notify_resume+0x825/0xd20 [ 3.339017] ? __pfx_sock_ioctl+0x10/0x10 [ 3.339316] ? __pfx___rseq_handle_notify_resume+0x10/0x10 [ 3.339727] ? selinux_file_ioctl+0xa4/0x260 [ 3.340166] __x64_sys_sendto+0xe0/0x1c0 [ 3.340526] ? syscall_exit_to_user_mode+0x123/0x140 [ 3.340898] do_syscall_64+0xa6/0x1a0 [ 3.341170] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 3.341533] RIP: 0033:0x44a380 [ 3.341757] Code: 0f 1f 84 00 00 00 00 00 66 90 f3 0f 1e fa 41 89 ca 64 8b 04 25 18 00 00 00 85 c00 [ 3.343078] RSP: 002b:00007ffc1d404098 EFLAGS: 00000246 ORIG_RAX: 000000000000002c [ 3.343631] RAX: ffffffffffffffda RBX: 00007ffc1d404458 RCX: 000000000044a380 [ 3.344306] RDX: 000000000000019c RSI: 00007ffc1d4040b0 RDI: 0000000000000003 [ 3.344833] RBP: 00007ffc1d404260 R08: 0000000000000000 R09: 0000000000000000 [ 3.345381] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 3.346015] R13: 00007ffc1d404448 R14: 00000000004c17d0 R15: 0000000000000001 [ 3.346503] [ 3.346679] Modules linked in: [ 3.346956] ---[ end trace 0000000000000000 ]--- [ 3.347315] RIP: 0010:eg_cache_remove_entry+0xa5/0x470 [ 3.347737] Code: c1 f7 6e fd 48 c7 c7 00 7e 38 b2 e8 95 64 54 fd 48 c7 c7 40 7e 38 b2 48 89 ee e80 [ 3.349157] RSP: 0018:ffff88800583f8a8 EFLAGS: 00010006 [ 3.349517] RAX: 0000000000000006 RBX: ffff888005989000 RCX: ffffffffaecc2d8e [ 3.350103] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000030 [ 3.350610] RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff6558b88 [ 3.351246] R10: 0000000000000003 R11: 203a207972746e65 R12: 1ffff11000b07f15 [ 3.351785] R13: dffffc0000000000 R14: ffff888005989000 R15: ffff888005989068 [ 3.352404] FS: 000000001b6313c0(0000) GS:ffff88806d380000(0000) knlGS:0000000000000000 [ 3.353099] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 3.353544] CR2: 00000000004b4b40 CR3: 000000000248e000 CR4: 00000000000006f0 [ 3.354072] note: ex[79] exited with irqs disabled [ 3.354458] note: ex[79] exited with preempt_count 1 Signed-off-by: Minjoong Kim Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Reviewed-by: Simon Horman --- Changes in v2: * Add KASAN report and Link to patch description * Link to v1 https://lore.kernel.org/netdev/20250314003404.16408-1-pwn9uin@gmail.com/ --- net/atm/mpc.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/atm/mpc.c b/net/atm/mpc.c index 324e3ab96bb3..12da0269275c 100644 --- a/net/atm/mpc.c +++ b/net/atm/mpc.c @@ -1314,6 +1314,8 @@ static void MPOA_cache_impos_rcvd(struct k_message *msg, holding_time = msg->content.eg_info.holding_time; dprintk("(%s) entry = %p, holding_time = %u\n", mpc->dev->name, entry, holding_time); + if (entry == NULL && !holding_time) + return; if (entry == NULL && holding_time) { entry = mpc->eg_ops->add_entry(msg, mpc); mpc->eg_ops->put(entry);