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66cc69e34e
Users have reported being unable to trace non-signed modules loaded within a kernel supporting module signature. This is caused by tracepoint.c:tracepoint_module_coming() refusing to take into account tracepoints sitting within force-loaded modules (TAINT_FORCED_MODULE). The reason for this check, in the first place, is that a force-loaded module may have a struct module incompatible with the layout expected by the kernel, and can thus cause a kernel crash upon forced load of that module on a kernel with CONFIG_TRACEPOINTS=y. Tracepoints, however, specifically accept TAINT_OOT_MODULE and TAINT_CRAP, since those modules do not lead to the "very likely system crash" issue cited above for force-loaded modules. With kernels having CONFIG_MODULE_SIG=y (signed modules), a non-signed module is tainted re-using the TAINT_FORCED_MODULE taint flag. Unfortunately, this means that Tracepoints treat that module as a force-loaded module, and thus silently refuse to consider any tracepoint within this module. Since an unsigned module does not fit within the "very likely system crash" category of tainting, add a new TAINT_UNSIGNED_MODULE taint flag to specifically address this taint behavior, and accept those modules within Tracepoints. We use the letter 'X' as a taint flag character for a module being loaded that doesn't know how to sign its name (proposed by Steven Rostedt). Also add the missing 'O' entry to trace event show_module_flags() list for the sake of completeness. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> NAKed-by: Ingo Molnar <mingo@redhat.com> CC: Thomas Gleixner <tglx@linutronix.de> CC: David Howells <dhowells@redhat.com> CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> |
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| .. | ||
| 9p.h | ||
| asoc.h | ||
| bcache.h | ||
| block.h | ||
| btrfs.h | ||
| compaction.h | ||
| context_tracking.h | ||
| ext3.h | ||
| ext4.h | ||
| f2fs.h | ||
| filemap.h | ||
| gfpflags.h | ||
| gpio.h | ||
| host1x.h | ||
| iommu.h | ||
| irq.h | ||
| jbd2.h | ||
| jbd.h | ||
| kmem.h | ||
| kvm.h | ||
| lock.h | ||
| mce.h | ||
| migrate.h | ||
| module.h | ||
| napi.h | ||
| net.h | ||
| nmi.h | ||
| oom.h | ||
| pagemap.h | ||
| power_cpu_migrate.h | ||
| power.h | ||
| printk.h | ||
| random.h | ||
| ras.h | ||
| rcu.h | ||
| regmap.h | ||
| regulator.h | ||
| rpm.h | ||
| sched.h | ||
| scsi.h | ||
| signal.h | ||
| skb.h | ||
| sock.h | ||
| spi.h | ||
| sunrpc.h | ||
| swiotlb.h | ||
| syscalls.h | ||
| target.h | ||
| task.h | ||
| timer.h | ||
| udp.h | ||
| v4l2.h | ||
| vmscan.h | ||
| workqueue.h | ||
| writeback.h | ||
| xen.h | ||