[Bug uprobes/10595] uprobe probes causes selinux failures

["mjw at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

------- Additional Comments From mjw at redhat dot com  2009-09-17 13:14 -------
Testing revealed a bug:

Kernel failure message 1:
BUG: unable to handle kernel NULL pointer dereference at 0000000000000630
IP: [<ffffffff814988d7>] _spin_lock+0x21/0x46
PGD b0e4067 PUD b0e3067 PMD 0 
Oops: 0002 [#1] SMP 
last sysfs file: /sys/module/xt_physdev/sections/__mcount_loc
CPU 7 
Modules linked in: stap_2c0d92a42696e0b495ce489ac431753a_4280 uprobes
stap_aa1e7516de55bfd642e59fea88b3a92e_724 fuse ipt_MASQUERADE iptable_nat nf_nat
nfsd lockd nfs_acl auth_rpcgss exportfs sunrpc bridge stp llc xt_physdev
ip6t_REJECT nf_conntrack_ipv6 ip6table_filter ip6_tables ipv6 cpufreq_ondemand
acpi_cpufreq freq_table dm_multipath kvm_intel kvm uinput snd_hda_codec_realtek
snd_hda_intel snd_hda_codec snd_usb_audio snd_usb_lib snd_pcm firewire_ohci
usb_storage snd_rawmidi firewire_core snd_timer snd_seq_device snd_hwdep snd tg3
pcspkr serio_raw snd_page_alloc soundcore crc_itu_t iTCO_wdt iTCO_vendor_support
wmi raid1 raid456 raid6_pq async_xor async_memcpy async_tx xor radeon drm
i2c_algo_bit i2c_core [last unloaded: stap_b39ec4f1c801ecdf527d18df16835669_60505]
Pid: 1635, comm: stapio Not tainted 2.6.30.5-43.fc11.x86_64 #1 HP Z400 Workstation
RIP: 0010:[<ffffffff814988d7>]  [<ffffffff814988d7>] _spin_lock+0x21/0x46
RSP: 0018:ffff88001c06fd08  EFLAGS: 00010246
RAX: 0000000000000100 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88001c06fdf8 RSI: 0000000000400830 RDI: 0000000000000630
RBP: ffff88001c06fd18 R08: ffffffffa066c040 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000400830
R13: ffff88001c06fdf8 R14: 0000000000000000 R15: 00007fff674f1a3c
FS:  00007f74a2fe16f0(0000) GS:ffff8800281c1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000630 CR3: 000000000b0e1000 CR4: 00000000000026e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
Process stapio (pid: 1635, threadinfo ffff88001c06e000, task ffff880018d39750)
Stack:
 0000000000000246 000000008d54a699 ffff88001c06fd48 ffffffff81054206
 0000000000000001 000000008d54a699 ffff88001c06fd78 0000000000000148
 ffff88001c06fde8 ffffffffa0664cd2 00007fff674f1a44 ffff88001c11aea0
Call Trace:
 [<ffffffff81054206>] get_task_mm+0x2c/0x67
 [<ffffffffa0664cd2>] __access_process_vm.clone.0+0x38/0x197
[stap_2c0d92a42696e0b495ce489ac431753a_4280]
 [<ffffffffa06662e4>] _stp_cleanup_and_exit+0xcc/0x202
[stap_2c0d92a42696e0b495ce489ac431753a_4280]
 [<ffffffffa0667bf8>] _stp_ctl_write_cmd+0x742/0x90e
[stap_2c0d92a42696e0b495ce489ac431753a_4280]
 [<ffffffff811eae5f>] ? selinux_file_permission+0x69/0x84
 [<ffffffff81114f6e>] vfs_write+0xbd/0x12e
 [<ffffffff811150d1>] sys_write+0x59/0x91
 [<ffffffff81012082>] system_call_fastpath+0x16/0x1b
Code: 00 74 05 e8 21 e9 bb ff c9 c3 55 48 89 e5 48 83 ec 10 0f 1f 44 00 00 65 48
8b 04 25 28 00 00 00 48 89 45 f8 31 c0 b8 00 01 00 00 <f0> 66 0f c1 07 38 e0 74
06 f3 90 8a 07 eb f6 48 8b 45 f8 65 48 
RIP  [<ffffffff814988d7>] _spin_lock+0x21/0x46
 RSP <ffff88001c06fd08>
CR2: 0000000000000630
---[ end trace 0d91556aaea5efba ]---

Not clear yet, what exactly triggered this one.

-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=10595

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