Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935017AbdDFN5t (ORCPT ); Thu, 6 Apr 2017 09:57:49 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:57531 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933018AbdDFNzs (ORCPT ); Thu, 6 Apr 2017 09:55:48 -0400 From: John Johansen To: jmorris@namei.org Cc: linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [PATCH 6/6] apparmor: Make path_max parameter readonly Date: Thu, 6 Apr 2017 06:55:24 -0700 Message-Id: <20170406135524.25481-7-john.johansen@canonical.com> X-Mailer: git-send-email 2.9.3 In-Reply-To: <20170406135524.25481-1-john.johansen@canonical.com> References: <20170406135524.25481-1-john.johansen@canonical.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5034 Lines: 74 The path_max parameter determines the max size of buffers allocated but it should not be setable at run time. If can be used to cause an oops root@ubuntu:~# echo 16777216 > /sys/module/apparmor/parameters/path_max root@ubuntu:~# cat /sys/module/apparmor/parameters/path_max Killed [ 122.141911] BUG: unable to handle kernel paging request at ffff880080945fff [ 122.143497] IP: [] d_absolute_path+0x44/0xa0 [ 122.144742] PGD 220c067 PUD 0 [ 122.145453] Oops: 0002 [#1] SMP [ 122.146204] Modules linked in: vmw_vsock_vmci_transport vsock ppdev vmw_balloon snd_ens1371 btusb snd_ac97_codec gameport snd_rawmidi btrtl snd_seq_device ac97_bus btbcm btintel snd_pcm input_leds bluetooth snd_timer snd joydev soundcore serio_raw coretemp shpchp nfit parport_pc i2c_piix4 8250_fintek vmw_vmci parport mac_hid ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear hid_generic usbhid hid crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd vmwgfx psmouse mptspi ttm mptscsih drm_kms_helper mptbase syscopyarea scsi_transport_spi sysfillrect [ 122.163365] ahci sysimgblt e1000 fb_sys_fops libahci drm pata_acpi fjes [ 122.164747] CPU: 3 PID: 1501 Comm: bash Not tainted 4.4.0-59-generic #80-Ubuntu [ 122.166250] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/02/2015 [ 122.168611] task: ffff88003496aa00 ti: ffff880076474000 task.ti: ffff880076474000 [ 122.170018] RIP: 0010:[] [] d_absolute_path+0x44/0xa0 [ 122.171525] RSP: 0018:ffff880076477b90 EFLAGS: 00010206 [ 122.172462] RAX: ffff880080945fff RBX: 0000000000000000 RCX: 0000000001000000 [ 122.173709] RDX: 0000000000ffffff RSI: ffff880080946000 RDI: ffff8800348a1010 [ 122.174978] RBP: ffff880076477bb8 R08: ffff880076477c80 R09: 0000000000000000 [ 122.176227] R10: 00007ffffffff000 R11: ffff88007f946000 R12: ffff88007f946000 [ 122.177496] R13: ffff880076477c80 R14: ffff8800348a1010 R15: ffff8800348a2400 [ 122.178745] FS: 00007fd459eb4700(0000) GS:ffff88007b6c0000(0000) knlGS:0000000000000000 [ 122.180176] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 122.181186] CR2: ffff880080945fff CR3: 0000000073422000 CR4: 00000000001406e0 [ 122.182469] Stack: [ 122.182843] 00ffffff00000001 ffff880080946000 0000000000000000 0000000000000000 [ 122.184409] 00000000570f789c ffff880076477c30 ffffffff81385671 ffff88007a2e7a58 [ 122.185810] 0000000000000000 ffff880076477c88 01000000008a1000 0000000000000000 [ 122.187231] Call Trace: [ 122.187680] [] aa_path_name+0x81/0x370 [ 122.188637] [] profile_transition+0xbd/0xb80 [ 122.190181] [] ? zone_statistics+0x7c/0xa0 [ 122.191674] [] apparmor_bprm_set_creds+0x9b0/0xac0 [ 122.193288] [] ? ext4_xattr_get+0x81/0x220 [ 122.194793] [] ? ext4_xattr_security_get+0x1c/0x30 [ 122.196392] [] ? get_vfs_caps_from_disk+0x69/0x110 [ 122.198004] [] ? mnt_may_suid+0x3f/0x50 [ 122.199737] [] ? cap_bprm_set_creds+0xa3/0x600 [ 122.201377] [] security_bprm_set_creds+0x33/0x50 [ 122.203024] [] prepare_binprm+0x85/0x190 [ 122.204515] [] do_execveat_common.isra.33+0x485/0x710 [ 122.206200] [] SyS_execve+0x3a/0x50 [ 122.207615] [] stub_execve+0x5/0x5 [ 122.208978] [] ? entry_SYSCALL_64_fastpath+0x16/0x71 [ 122.210615] Code: f8 31 c0 48 63 c2 83 ea 01 48 c7 45 e8 00 00 00 00 48 01 c6 85 d2 48 c7 45 f0 00 00 00 00 48 89 75 e0 89 55 dc 78 0c 48 8d 46 ff 46 ff 00 48 89 45 e0 48 8d 55 e0 48 8d 4d dc 48 8d 75 e8 e8 [ 122.217320] RIP [] d_absolute_path+0x44/0xa0 [ 122.218860] RSP [ 122.219919] CR2: ffff880080945fff [ 122.220936] ---[ end trace 506cdbd85eb6c55e ]--- Reported-by: Tetsuo Handa Signed-off-by: John Johansen --- security/apparmor/lsm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c index 77d4045..005ad43 100644 --- a/security/apparmor/lsm.c +++ b/security/apparmor/lsm.c @@ -710,7 +710,7 @@ module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR); /* Maximum pathname length before accesses will start getting rejected */ unsigned int aa_g_path_max = 2 * PATH_MAX; -module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR | S_IWUSR); +module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR); /* Determines how paranoid loading of policy is and how much verification * on the loaded policy is done. -- 2.9.3