From b6b1b81b3afba922505b57f4c812bba022f7c4a9 Mon Sep 17 00:00:00 2001 From: John Johansen Date: Sun, 8 Jun 2014 11:20:54 -0700 Subject: [PATCH] apparmor: fix uninitialized lsm_audit member BugLink: http://bugs.launchpad.net/bugs/1268727 The task field in the lsm_audit struct needs to be initialized if a change_hat fails, otherwise the following oops will occur BUG: unable to handle kernel paging request at 0000002fbead7d08 IP: [] _raw_spin_lock+0xe/0x50 PGD 1e3f35067 PUD 0 Oops: 0002 [#1] SMP Modules linked in: pppox crc_ccitt p8023 p8022 psnap llc ax25 btrfs raid6_pq xor xfs libcrc32c dm_multipath scsi_dh kvm_amd dcdbas kvm microcode amd64_edac_mod joydev edac_core psmouse edac_mce_amd serio_raw k10temp sp5100_tco i2c_piix4 ipmi_si ipmi_msghandler acpi_power_meter mac_hid lp parport hid_generic usbhid hid pata_acpi mpt2sas ahci raid_class pata_atiixp bnx2 libahci scsi_transport_sas [last unloaded: tipc] CPU: 2 PID: 699 Comm: changehat_twice Tainted: GF O 3.13.0-7-generic #25-Ubuntu Hardware name: Dell Inc. PowerEdge R415/08WNM9, BIOS 1.8.6 12/06/2011 task: ffff8802135c6000 ti: ffff880212986000 task.ti: ffff880212986000 RIP: 0010:[] [] _raw_spin_lock+0xe/0x50 RSP: 0018:ffff880212987b68 EFLAGS: 00010006 RAX: 0000000000020000 RBX: 0000002fbead7500 RCX: 0000000000000000 RDX: 0000000000000292 RSI: ffff880212987ba8 RDI: 0000002fbead7d08 RBP: ffff880212987b68 R08: 0000000000000246 R09: ffff880216e572a0 R10: ffffffff815fd677 R11: ffffea0008469580 R12: ffffffff8130966f R13: ffff880212987ba8 R14: 0000002fbead7d08 R15: ffff8800d8c6b830 FS: 00002b5e6c84e7c0(0000) GS:ffff880216e40000(0000) knlGS:0000000055731700 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000002fbead7d08 CR3: 000000021270f000 CR4: 00000000000006e0 Stack: ffff880212987b98 ffffffff81075f17 ffffffff8130966f 0000000000000009 0000000000000000 0000000000000000 ffff880212987bd0 ffffffff81075f7c 0000000000000292 ffff880212987c08 ffff8800d8c6b800 0000000000000026 Call Trace: [] __lock_task_sighand+0x47/0x80 [] ? apparmor_cred_prepare+0x2f/0x50 [] do_send_sig_info+0x2c/0x80 [] send_sig_info+0x1e/0x30 [] aa_audit+0x13d/0x190 [] aa_audit_file+0xbc/0x130 [] ? apparmor_cred_prepare+0x2f/0x50 [] aa_change_hat+0x202/0x530 [] aa_setprocattr_changehat+0x116/0x1d0 [] apparmor_setprocattr+0x25d/0x300 [] security_setprocattr+0x16/0x20 [] proc_pid_attr_write+0x107/0x130 [] vfs_write+0xb4/0x1f0 [] SyS_write+0x49/0xa0 [] tracesys+0xe1/0xe6 Signed-off-by: John Johansen Acked-by: Seth Arnold --- security/apparmor/audit.c | 3 ++- security/apparmor/file.c | 3 ++- 2 files changed, 4 insertions(+), 2 deletions(-) diff --git a/security/apparmor/audit.c b/security/apparmor/audit.c index 89c78658031f..3a7f1da1425e 100644 --- a/security/apparmor/audit.c +++ b/security/apparmor/audit.c @@ -200,7 +200,8 @@ int aa_audit(int type, struct aa_profile *profile, gfp_t gfp, if (sa->aad->type == AUDIT_APPARMOR_KILL) (void)send_sig_info(SIGKILL, NULL, - sa->u.tsk ? sa->u.tsk : current); + sa->type == LSM_AUDIT_DATA_TASK && sa->u.tsk ? + sa->u.tsk : current); if (sa->aad->type == AUDIT_APPARMOR_ALLOWED) return complain_error(sa->aad->error); diff --git a/security/apparmor/file.c b/security/apparmor/file.c index d186674f973a..4d2af4b01033 100644 --- a/security/apparmor/file.c +++ b/security/apparmor/file.c @@ -110,7 +110,8 @@ int aa_audit_file(struct aa_profile *profile, struct file_perms *perms, int type = AUDIT_APPARMOR_AUTO; struct common_audit_data sa; struct apparmor_audit_data aad = {0,}; - sa.type = LSM_AUDIT_DATA_NONE; + sa.type = LSM_AUDIT_DATA_TASK; + sa.u.tsk = NULL; sa.aad = &aad; aad.op = op, aad.fs.request = request; -- 2.39.5