On Wed, Apr 20, 2016 at 11:52:45PM -0700, John Johansen wrote: > 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: [<ffffffff8171153e>] _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:[<ffffffff8171153e>] [<ffffffff8171153e>] _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: > [<ffffffff81075f17>] __lock_task_sighand+0x47/0x80 > [<ffffffff8130966f>] ? apparmor_cred_prepare+0x2f/0x50 > [<ffffffff81075f7c>] do_send_sig_info+0x2c/0x80 > [<ffffffff81075fee>] send_sig_info+0x1e/0x30 > [<ffffffff8130242d>] aa_audit+0x13d/0x190 > [<ffffffff8130c1dc>] aa_audit_file+0xbc/0x130 > [<ffffffff8130966f>] ? apparmor_cred_prepare+0x2f/0x50 > [<ffffffff81304cc2>] aa_change_hat+0x202/0x530 > [<ffffffff81308fc6>] aa_setprocattr_changehat+0x116/0x1d0 > [<ffffffff8130a11d>] apparmor_setprocattr+0x25d/0x300 > [<ffffffff812cee56>] security_setprocattr+0x16/0x20 > [<ffffffff8121fc87>] proc_pid_attr_write+0x107/0x130 > [<ffffffff811b7604>] vfs_write+0xb4/0x1f0 > [<ffffffff811b8039>] SyS_write+0x49/0xa0 > [<ffffffff8171a1bf>] tracesys+0xe1/0xe6 > > Signed-off-by: John Johansen <[email protected]>
Acked-by: Seth Arnold <[email protected]> Thanks > --- > 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 89c7865..3a7f1da 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 913f377..43d6ae7 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;
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