- 13 3月, 2014 2 次提交
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由 Mathieu Desnoyers 提交于
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: NMathieu Desnoyers <mathieu.desnoyers@efficios.com> Acked-by: NSteven Rostedt <rostedt@goodmis.org> NAKed-by: NIngo 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: NRusty Russell <rusty@rustcorp.com.au>
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由 Jiri Slaby 提交于
When dumping loaded modules, we print them one by one in separate printks. Let's use pr_cont as they are continuation prints. Signed-off-by: NJiri Slaby <jslaby@suse.cz> Cc: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 21 1月, 2014 1 次提交
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由 Tetsuo Handa 提交于
Add missing \n and also follow commit bddb12b3 "kernel/module.c: use pr_foo()". Signed-off-by: NTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 13 11月, 2013 1 次提交
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由 Andrew Morton 提交于
kernel/module.c uses a mix of printk(KERN_foo and pr_foo(). Convert it all to pr_foo and make the offered cleanups. Not sure what to do about the printk(KERN_DEFAULT). We don't have a pr_default(). Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Joe Perches <joe@perches.com> Cc: Frantisek Hrbata <fhrbata@redhat.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 17 10月, 2013 1 次提交
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由 Frantisek Hrbata 提交于
This adds the .init_array section as yet another section with constructors. This is needed because gcc could add __gcov_init calls to .init_array or .ctors section, depending on gcc (and binutils) version . v2: - reuse mod->ctors for .init_array section for modules, because gcc uses .ctors or .init_array, but not both at the same time v3: - fail to load if that does happen somehow. Signed-off-by: NFrantisek Hrbata <fhrbata@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 23 9月, 2013 1 次提交
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由 Rusty Russell 提交于
The option to wait for a module reference count to reach zero was in the initial module implementation, but it was never supported in modprobe (you had to use rmmod --wait). After discussion with Lucas, It has been deprecated (with a 10 second sleep) in kmod for the last year. This finally removes it: the flag will evoke a printk warning and a normal (non-blocking) remove attempt. Cc: Lucas De Marchi <lucas.de.marchi@gmail.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 04 9月, 2013 1 次提交
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由 Al Viro 提交于
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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- 03 9月, 2013 1 次提交
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由 Li Zhong 提交于
DEBUG_KOBJECT_RELEASE helps to find the issue attached below. After some investigation, it seems the reason is: The mod->mkobj.kobj(ffffffffa01600d0 below) is freed together with mod itself in free_module(). However, its children still hold references to it, as the delay caused by DEBUG_KOBJECT_RELEASE. So when the child(holders below) tries to decrease the reference count to its parent in kobject_del(), BUG happens as it tries to access already freed memory. This patch tries to fix it by waiting for the mod->mkobj.kobj to be really released in the module removing process (and some error code paths). [ 1844.175287] kobject: 'holders' (ffff88007c1f1600): kobject_release, parent ffffffffa01600d0 (delayed) [ 1844.178991] kobject: 'notes' (ffff8800370b2a00): kobject_release, parent ffffffffa01600d0 (delayed) [ 1845.180118] kobject: 'holders' (ffff88007c1f1600): kobject_cleanup, parent ffffffffa01600d0 [ 1845.182130] kobject: 'holders' (ffff88007c1f1600): auto cleanup kobject_del [ 1845.184120] BUG: unable to handle kernel paging request at ffffffffa01601d0 [ 1845.185026] IP: [<ffffffff812cda81>] kobject_put+0x11/0x60 [ 1845.185026] PGD 1a13067 PUD 1a14063 PMD 7bd30067 PTE 0 [ 1845.185026] Oops: 0000 [#1] PREEMPT [ 1845.185026] Modules linked in: xfs libcrc32c [last unloaded: kprobe_example] [ 1845.185026] CPU: 0 PID: 18 Comm: kworker/0:1 Tainted: G O 3.11.0-rc6-next-20130819+ #1 [ 1845.185026] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007 [ 1845.185026] Workqueue: events kobject_delayed_cleanup [ 1845.185026] task: ffff88007ca51f00 ti: ffff88007ca5c000 task.ti: ffff88007ca5c000 [ 1845.185026] RIP: 0010:[<ffffffff812cda81>] [<ffffffff812cda81>] kobject_put+0x11/0x60 [ 1845.185026] RSP: 0018:ffff88007ca5dd08 EFLAGS: 00010282 [ 1845.185026] RAX: 0000000000002000 RBX: ffffffffa01600d0 RCX: ffffffff8177d638 [ 1845.185026] RDX: ffff88007ca5dc18 RSI: 0000000000000000 RDI: ffffffffa01600d0 [ 1845.185026] RBP: ffff88007ca5dd18 R08: ffffffff824e9810 R09: ffffffffffffffff [ 1845.185026] R10: ffff8800ffffffff R11: dead4ead00000001 R12: ffffffff81a95040 [ 1845.185026] R13: ffff88007b27a960 R14: ffff88007c1f1600 R15: 0000000000000000 [ 1845.185026] FS: 0000000000000000(0000) GS:ffffffff81a23000(0000) knlGS:0000000000000000 [ 1845.185026] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 1845.185026] CR2: ffffffffa01601d0 CR3: 0000000037207000 CR4: 00000000000006b0 [ 1845.185026] Stack: [ 1845.185026] ffff88007c1f1600 ffff88007c1f1600 ffff88007ca5dd38 ffffffff812cdb7e [ 1845.185026] 0000000000000000 ffff88007c1f1640 ffff88007ca5dd68 ffffffff812cdbfe [ 1845.185026] ffff88007c974800 ffff88007c1f1640 ffff88007ff61a00 0000000000000000 [ 1845.185026] Call Trace: [ 1845.185026] [<ffffffff812cdb7e>] kobject_del+0x2e/0x40 [ 1845.185026] [<ffffffff812cdbfe>] kobject_delayed_cleanup+0x6e/0x1d0 [ 1845.185026] [<ffffffff81063a45>] process_one_work+0x1e5/0x670 [ 1845.185026] [<ffffffff810639e3>] ? process_one_work+0x183/0x670 [ 1845.185026] [<ffffffff810642b3>] worker_thread+0x113/0x370 [ 1845.185026] [<ffffffff810641a0>] ? rescuer_thread+0x290/0x290 [ 1845.185026] [<ffffffff8106bfba>] kthread+0xda/0xe0 [ 1845.185026] [<ffffffff814ff0f0>] ? _raw_spin_unlock_irq+0x30/0x60 [ 1845.185026] [<ffffffff8106bee0>] ? kthread_create_on_node+0x130/0x130 [ 1845.185026] [<ffffffff8150751a>] ret_from_fork+0x7a/0xb0 [ 1845.185026] [<ffffffff8106bee0>] ? kthread_create_on_node+0x130/0x130 [ 1845.185026] Code: 81 48 c7 c7 28 95 ad 81 31 c0 e8 9b da 01 00 e9 4f ff ff ff 66 0f 1f 44 00 00 55 48 89 e5 53 48 89 fb 48 83 ec 08 48 85 ff 74 1d <f6> 87 00 01 00 00 01 74 1e 48 8d 7b 38 83 6b 38 01 0f 94 c0 84 [ 1845.185026] RIP [<ffffffff812cda81>] kobject_put+0x11/0x60 [ 1845.185026] RSP <ffff88007ca5dd08> [ 1845.185026] CR2: ffffffffa01601d0 [ 1845.185026] ---[ end trace 49a70afd109f5653 ]--- Signed-off-by: NLi Zhong <zhong@linux.vnet.ibm.com> Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 20 8月, 2013 2 次提交
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由 Chen Gang 提交于
For some strings, they are permitted to be larger than PAGE_SIZE, so need use scnprintf() instead of sprintf(), or it will cause issue. One case is: if a module version is crazy defined (length more than PAGE_SIZE), 'modinfo' command is still OK (print full contents), but for "cat /sys/modules/'modname'/version", will cause issue in kernel. Signed-off-by: NChen Gang <gang.chen@asianux.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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由 Steven Rostedt 提交于
The ops that uses param_set_bool_enable_only() as its set function can easily handle being used without an argument. There's no reason to fail the loading of the module if it does not have one. Signed-off-by: NSteven Rostedt <rostedt@goodmis.org> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 03 7月, 2013 2 次提交
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由 Rusty Russell 提交于
Fold alloc_module_percpu into percpu_modalloc(). Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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由 Rusty Russell 提交于
v3.8-rc1-5-g1fb9341a was supposed to stop parallel kvm loads exhausting percpu memory on large machines: Now we have a new state MODULE_STATE_UNFORMED, we can insert the module into the list (and thus guarantee its uniqueness) before we allocate the per-cpu region. In my defence, it didn't actually say the patch did this. Just that we "can". This patch actually *does* it. Signed-off-by: NRusty Russell <rusty@rustcorp.com.au> Tested-by: NJim Hull <jim.hull@hp.com> Cc: stable@kernel.org # 3.8
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- 02 7月, 2013 2 次提交
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由 Rusty Russell 提交于
Although parameters are supposed to be part of the kernel API, experimental parameters are often removed. In addition, downgrading a kernel might cause previously-working modules to fail to load. On balance, it's probably better to warn, and load the module anyway. This may let through a typo, but at least the logs will show it. Reported-by: NAndy Lutomirski <luto@amacapital.net> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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由 Mathias Krause 提交于
If we pass a pointer to a const string in the form "module:symbol" module_kallsyms_lookup_name() will try to split the string at the colon, i.e., will try to modify r/o data. That will, in fact, fail on a kernel with enabled CONFIG_DEBUG_RODATA. Avoid modifying the passed string in module_kallsyms_lookup_name(), modify find_module_all() instead to pass it the module name length. Signed-off-by: NMathias Krause <minipli@googlemail.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 17 5月, 2013 2 次提交
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由 Steven Rostedt 提交于
As kmemleak now scans all module sections that are allocated, writable and non executable, there's no need to scan individual sections that might reference data. Signed-off-by: NSteven Rostedt <rostedt@goodmis.org> Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com> Acked-by: NRusty Russell <rusty@rustcorp.com.au>
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由 Steven Rostedt 提交于
Instead of just picking data sections by name (names that start with .data, .bss or .ref.data), use the section flags and scan all sections that are allocated, writable and not executable. Which should cover all sections of a module that might reference data. Signed-off-by: NSteven Rostedt <rostedt@goodmis.org> [catalin.marinas@arm.com: removed unused 'name' variable] [catalin.marinas@arm.com: collapsed 'if' blocks] Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com> Acked-by: NRusty Russell <rusty@rustcorp.com.au>
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- 17 4月, 2013 1 次提交
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由 Rusty Russell 提交于
Otherwise we get a race between unload and reload of the same module: the new module doesn't see the old one in the list, but then fails because it can't register over the still-extant entries in sysfs: [ 103.981925] ------------[ cut here ]------------ [ 103.986902] WARNING: at fs/sysfs/dir.c:536 sysfs_add_one+0xab/0xd0() [ 103.993606] Hardware name: CrownBay Platform [ 103.998075] sysfs: cannot create duplicate filename '/module/pch_gbe' [ 104.004784] Modules linked in: pch_gbe(+) [last unloaded: pch_gbe] [ 104.011362] Pid: 3021, comm: modprobe Tainted: G W 3.9.0-rc5+ #5 [ 104.018662] Call Trace: [ 104.021286] [<c103599d>] warn_slowpath_common+0x6d/0xa0 [ 104.026933] [<c1168c8b>] ? sysfs_add_one+0xab/0xd0 [ 104.031986] [<c1168c8b>] ? sysfs_add_one+0xab/0xd0 [ 104.037000] [<c1035a4e>] warn_slowpath_fmt+0x2e/0x30 [ 104.042188] [<c1168c8b>] sysfs_add_one+0xab/0xd0 [ 104.046982] [<c1168dbe>] create_dir+0x5e/0xa0 [ 104.051633] [<c1168e78>] sysfs_create_dir+0x78/0xd0 [ 104.056774] [<c1262bc3>] kobject_add_internal+0x83/0x1f0 [ 104.062351] [<c126daf6>] ? kvasprintf+0x46/0x60 [ 104.067231] [<c1262ebd>] kobject_add_varg+0x2d/0x50 [ 104.072450] [<c1262f07>] kobject_init_and_add+0x27/0x30 [ 104.078075] [<c1089240>] mod_sysfs_setup+0x80/0x540 [ 104.083207] [<c1260851>] ? module_bug_finalize+0x51/0xc0 [ 104.088720] [<c108ab29>] load_module+0x1429/0x18b0 We can teardown sysfs first, then to be sure, put the state in MODULE_STATE_UNFORMED so it's ignored while we deconstruct it. Reported-by: NVeaceslav Falico <vfalico@redhat.com> Tested-by: NVeaceslav Falico <vfalico@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 20 3月, 2013 1 次提交
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由 James Hogan 提交于
Fix symbol versioning on architectures with symbol prefixes. Although the build was free from warnings the actual modules still wouldn't load as the ____versions table contained unprefixed symbol names, which were being compared against the prefixed symbol names when checking the symbol versions. This is fixed by modifying modpost to add the symbol prefix to the ____versions table it outputs (Modules.symvers still contains unprefixed symbol names). The check_modstruct_version() function is also fixed as it checks the version of the unprefixed "module_layout" symbol which would no longer work. Signed-off-by: NJames Hogan <james.hogan@imgtec.com> Cc: Michal Marek <mmarek@suse.cz> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Jonathan Kliegman <kliegs@chromium.org> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (use VMLINUX_SYMBOL_STR)
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- 15 3月, 2013 1 次提交
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由 Rusty Russell 提交于
We have CONFIG_SYMBOL_PREFIX, which three archs define to the string "_". But Al Viro broke this in "consolidate cond_syscall and SYSCALL_ALIAS declarations" (in linux-next), and he's not the first to do so. Using CONFIG_SYMBOL_PREFIX is awkward, since we usually just want to prefix it so something. So various places define helpers which are defined to nothing if CONFIG_SYMBOL_PREFIX isn't set: 1) include/asm-generic/unistd.h defines __SYMBOL_PREFIX. 2) include/asm-generic/vmlinux.lds.h defines VMLINUX_SYMBOL(sym) 3) include/linux/export.h defines MODULE_SYMBOL_PREFIX. 4) include/linux/kernel.h defines SYMBOL_PREFIX (which differs from #7) 5) kernel/modsign_certificate.S defines ASM_SYMBOL(sym) 6) scripts/modpost.c defines MODULE_SYMBOL_PREFIX 7) scripts/Makefile.lib defines SYMBOL_PREFIX on the commandline if CONFIG_SYMBOL_PREFIX is set, so that we have a non-string version for pasting. (arch/h8300/include/asm/linkage.h defines SYMBOL_NAME(), too). Let's solve this properly: 1) No more generic prefix, just CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX. 2) Make linux/export.h usable from asm. 3) Define VMLINUX_SYMBOL() and VMLINUX_SYMBOL_STR(). 4) Make everyone use them. Signed-off-by: NRusty Russell <rusty@rustcorp.com.au> Reviewed-by: NJames Hogan <james.hogan@imgtec.com> Tested-by: James Hogan <james.hogan@imgtec.com> (metag)
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- 26 2月, 2013 1 次提交
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由 Al Viro 提交于
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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- 21 1月, 2013 4 次提交
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由 Rusty Russell 提交于
1fb9341a made our locking in load_module more complicated: we grab the mutex once to insert the module in the list, then again to upgrade it once it's formed. Since the locking is self-contained, it's neater to do this in separate functions. Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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由 Rusty Russell 提交于
Fix up all callers as they were before, with make one change: an unsigned module taints the kernel, but doesn't turn off lockdep. Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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由 Rusty Russell 提交于
Reported-by: NChris Samuel <chris@csamuel.org> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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由 Linus Torvalds 提交于
Commit 1fb9341a ("module: put modules in list much earlier") moved some of the module initialization code around, and in the process changed the exit paths too. But for the duplicate export symbol error case the change made the ddebug_cleanup path jump to after the module mutex unlock, even though it happens with the mutex held. Rusty has some patches to split this function up into some helper functions, hopefully the mess of complex goto targets will go away eventually. Reported-by: NDan Carpenter <dan.carpenter@oracle.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 17 1月, 2013 1 次提交
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由 Tejun Heo 提交于
If the default iosched is built as module, the kernel may deadlock while trying to load the iosched module on device probe if the probing was running off async. This is because async_synchronize_full() at the end of module init ends up waiting for the async job which initiated the module loading. async A modprobe 1. finds a device 2. registers the block device 3. request_module(default iosched) 4. modprobe in userland 5. load and init module 6. async_synchronize_full() Async A waits for modprobe to finish in request_module() and modprobe waits for async A to finish in async_synchronize_full(). Because there's no easy to track dependency once control goes out to userland, implementing properly nested flushing is difficult. For now, make module init perform async_synchronize_full() iff module init has queued async jobs as suggested by Linus. This avoids the described deadlock because iosched module doesn't use async and thus wouldn't invoke async_synchronize_full(). This is hacky and incomplete. It will deadlock if async module loading nests; however, this works around the known problem case and seems to be the best of bad options. For more details, please refer to the following thread. http://thread.gmane.org/gmane.linux.kernel/1420814Signed-off-by: NTejun Heo <tj@kernel.org> Reported-by: NAlex Riesen <raa.lkml@gmail.com> Tested-by: NMing Lei <ming.lei@canonical.com> Tested-by: NAlex Riesen <raa.lkml@gmail.com> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 12 1月, 2013 2 次提交
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由 Rusty Russell 提交于
Prarit's excellent bug report: > In recent Fedora releases (F17 & F18) some users have reported seeing > messages similar to > > [ 15.478160] kvm: Could not allocate 304 bytes percpu data > [ 15.478174] PERCPU: allocation failed, size=304 align=32, alloc from > reserved chunk failed > > during system boot. In some cases, users have also reported seeing this > message along with a failed load of other modules. > > What is happening is systemd is loading an instance of the kvm module for > each cpu found (see commit e9bda3b3). When the module load occurs the kernel > currently allocates the modules percpu data area prior to checking to see > if the module is already loaded or is in the process of being loaded. If > the module is already loaded, or finishes load, the module loading code > releases the current instance's module's percpu data. Now we have a new state MODULE_STATE_UNFORMED, we can insert the module into the list (and thus guarantee its uniqueness) before we allocate the per-cpu region. Reported-by: NPrarit Bhargava <prarit@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au> Tested-by: NPrarit Bhargava <prarit@redhat.com>
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由 Rusty Russell 提交于
You should never look at such a module, so it's excised from all paths which traverse the modules list. We add the state at the end, to avoid gratuitous ABI break (ksplice). Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 03 1月, 2013 1 次提交
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由 Sasha Levin 提交于
If we try to finit_module on a file sized 0 bytes vmalloc will scream and spit out a warning. Since modules have to be bigger than 0 bytes anyways we can just check that beforehand and avoid the warning. Signed-off-by: NSasha Levin <sasha.levin@oracle.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 18 12月, 2012 1 次提交
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由 Tao Ma 提交于
In commit 9c0ece06 ("Get rid of Documentation/feature-removal.txt"), Linus removed feature-removal-schedule.txt from Documentation, but there is still some reference to this file. So remove them. Signed-off-by: NTao Ma <boyu.mt@taobao.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 14 12月, 2012 5 次提交
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由 Rusty Russell 提交于
In commit d0a21265 David Rientjes unified various archs' module_alloc implementation (including x86) and removed the graduitous shortcut for size == 0. Then, in commit de7d2b56, Joe Perches added a warning for zero-length vmallocs, which can happen without kallsyms on modules with no init sections (eg. zlib_deflate). Fix this once and for all; the module code has to handle zero length anyway, so get it right at the caller and remove the now-gratuitous checks within the arch-specific module_alloc implementations. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=42608Reported-by: NConrad Kostecki <ConiKost@gmx.de> Cc: David Rientjes <rientjes@google.com> Cc: Joe Perches <joe@perches.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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由 Satoru Takeuchi 提交于
There is a extra null character('\0') at the top of module->strtab for each module. Commit 59ef28b1 introduced this bug and this patch fixes it. Live dump log of the current linus git kernel(HEAD is 2844a487): ============================================================================ crash> mod | grep loop ffffffffa01db0a0 loop 16689 (not loaded) [CONFIG_KALLSYMS] crash> module.core_symtab ffffffffa01db0a0 core_symtab = 0xffffffffa01db320crash> rd 0xffffffffa01db320 12 ffffffffa01db320: 0000005500000001 0000000000000000 ....U........... ffffffffa01db330: 0000000000000000 0002007400000002 ............t... ffffffffa01db340: ffffffffa01d8000 0000000000000038 ........8....... ffffffffa01db350: 001a00640000000e ffffffffa01daeb0 ....d........... ffffffffa01db360: 00000000000000a0 0002007400000019 ............t... ffffffffa01db370: ffffffffa01d8068 000000000000001b h............... crash> module.core_strtab ffffffffa01db0a0 core_strtab = 0xffffffffa01dbb30 "" crash> rd 0xffffffffa01dbb30 4 ffffffffa01dbb30: 615f70616d6b0000 66780063696d6f74 ..kmap_atomic.xf ffffffffa01dbb40: 73636e75665f7265 72665f646e696600 er_funcs.find_fr ============================================================================ We expect Just first one byte of '\0', but actually first two bytes are '\0'. Here is The relationship between symtab and strtab. symtab_idx strtab_idx symbol ----------------------------------------------- 0 0x1 "\0" # startab_idx should be 0 1 0x2 "kmap_atomic" 2 0xe "xfer_funcs" 3 0x19 "find_fr..." By applying this patch, it becomes as follows. symtab_idx strtab_idx symbol ----------------------------------------------- 0 0x0 "\0" # extra byte is removed 1 0x1 "kmap_atomic" 2 0xd "xfer_funcs" 3 0x18 "find_fr..." Signed-off-by: NSatoru Takeuchi <takeuchi_satoru@jp.fujitsu.com> Cc: Masaki Kimura <masaki.kimura.kz@hitachi.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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由 Kees Cook 提交于
Now that kernel module origins can be reasoned about, provide a hook to the LSMs to make policy decisions about the module file. This will let Chrome OS enforce that loadable kernel modules can only come from its read-only hash-verified root filesystem. Other LSMs can, for example, read extended attributes for signatures, etc. Signed-off-by: NKees Cook <keescook@chromium.org> Acked-by: NSerge E. Hallyn <serge.hallyn@canonical.com> Acked-by: NEric Paris <eparis@redhat.com> Acked-by: NMimi Zohar <zohar@us.ibm.com> Acked-by: NJames Morris <james.l.morris@oracle.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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由 Rusty Russell 提交于
Thanks to Michael Kerrisk for keeping us honest. These flags are actually useful for eliminating the only case where kmod has to mangle a module's internals: for overriding module versioning. Signed-off-by: NRusty Russell <rusty@rustcorp.com.au> Acked-by: NLucas De Marchi <lucas.demarchi@profusion.mobi> Acked-by: NKees Cook <keescook@chromium.org>
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由 Kees Cook 提交于
As part of the effort to create a stronger boundary between root and kernel, Chrome OS wants to be able to enforce that kernel modules are being loaded only from our read-only crypto-hash verified (dm_verity) root filesystem. Since the init_module syscall hands the kernel a module as a memory blob, no reasoning about the origin of the blob can be made. Earlier proposals for appending signatures to kernel modules would not be useful in Chrome OS, since it would involve adding an additional set of keys to our kernel and builds for no good reason: we already trust the contents of our root filesystem. We don't need to verify those kernel modules a second time. Having to do signature checking on module loading would slow us down and be redundant. All we need to know is where a module is coming from so we can say yes/no to loading it. If a file descriptor is used as the source of a kernel module, many more things can be reasoned about. In Chrome OS's case, we could enforce that the module lives on the filesystem we expect it to live on. In the case of IMA (or other LSMs), it would be possible, for example, to examine extended attributes that may contain signatures over the contents of the module. This introduces a new syscall (on x86), similar to init_module, that has only two arguments. The first argument is used as a file descriptor to the module and the second argument is a pointer to the NULL terminated string of module arguments. Signed-off-by: NKees Cook <keescook@chromium.org> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (merge fixes)
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- 31 10月, 2012 1 次提交
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由 Rusty Russell 提交于
Masaki found and patched a kallsyms issue: the last symbol in a module's symtab wasn't transferred. This is because we manually copy the zero'th entry (which is always empty) then copy the rest in a loop starting at 1, though from src[0]. His fix was minimal, I prefer to rewrite the loops in more standard form. There are two loops: one to get the size, and one to copy. Make these identical: always count entry 0 and any defined symbol in an allocated non-init section. This bug exists since the following commit was introduced. module: reduce symbol table for loaded modules (v2) commit: 4a496226 LKML: http://lkml.org/lkml/2012/10/24/27Reported-by: NMasaki Kimura <masaki.kimura.kz@hitachi.com> Cc: stable@kernel.org
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- 20 10月, 2012 1 次提交
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由 David Howells 提交于
Emit the magic string that indicates a module has a signature after the signature data instead of before it. This allows module_sig_check() to be made simpler and faster by the elimination of the search for the magic string. Instead we just need to do a single memcmp(). This works because at the end of the signature data there is the fixed-length signature information block. This block then falls immediately prior to the magic number. From the contents of the information block, it is trivial to calculate the size of the signature data and thus the size of the actual module data. Signed-off-by: NDavid Howells <dhowells@redhat.com> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 10 10月, 2012 2 次提交
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由 David Howells 提交于
If we're in FIPS mode, we should panic if we fail to verify the signature on a module or we're asked to load an unsigned module in signature enforcing mode. Possibly FIPS mode should automatically enable enforcing mode. Signed-off-by: NDavid Howells <dhowells@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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由 Rusty Russell 提交于
We do a very simple search for a particular string appended to the module (which is cache-hot and about to be SHA'd anyway). There's both a config option and a boot parameter which control whether we accept or fail with unsigned modules and modules that are signed with an unknown key. If module signing is enabled, the kernel will be tainted if a module is loaded that is unsigned or has a signature for which we don't have the key. (Useful feedback and tweaks by David Howells <dhowells@redhat.com>) Signed-off-by: NRusty Russell <rusty@rustcorp.com.au> Signed-off-by: NDavid Howells <dhowells@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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- 28 9月, 2012 2 次提交
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由 Rusty Russell 提交于
The original module-init-tools module loader used a fnctl lock on the .ko file to avoid attempts to simultaneously load a module. Unfortunately, you can't get an exclusive fcntl lock on a read-only fd, making this not work for read-only mounted filesystems. module-init-tools has a hacky sleep-and-loop for this now. It's not that hard to wait in the kernel, and only return -EEXIST once the first module has finished loading (or continue loading the module if the first one failed to initialize for some reason). It's also consistent with what we do for dependent modules which are still loading. Suggested-by: NLucas De Marchi <lucas.demarchi@profusion.mobi> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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由 Rusty Russell 提交于
We use resolve_symbol_wait(), which blocks if the module containing the symbol is still loading. However: 1) The module_wq we use is only woken after calling the modules' init function, but there are other failure paths after the module is placed in the linked list where we need to do the same thing. 2) wake_up() only wakes one waiter, and our waitqueue is shared by all modules, so we need to wake them all. 3) wake_up_all() doesn't imply a memory barrier: I feel happier calling it after we've grabbed and dropped the module_mutex, not just after the state assignment. Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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