summaryrefslogtreecommitdiff
path: root/kernel
diff options
context:
space:
mode:
authorSteven Rostedt <srostedt@redhat.com>2012-12-14 09:48:15 -0500
committerSteven Rostedt <rostedt@goodmis.org>2013-01-21 13:21:50 -0500
commitc1bf08ac26e92122faab9f6c32ea8aba94612dae (patch)
tree3d950c0592ad2394d8e1230d463024cf2d18bebc /kernel
parent7d1f9aeff1ee4a20b1aeb377dd0f579fe9647619 (diff)
ftrace: Be first to run code modification on modules
If some other kernel subsystem has a module notifier, and adds a kprobe to a ftrace mcount point (now that kprobes work on ftrace points), when the ftrace notifier runs it will fail and disable ftrace, as well as kprobes that are attached to ftrace points. Here's the error: WARNING: at kernel/trace/ftrace.c:1618 ftrace_bug+0x239/0x280() Hardware name: Bochs Modules linked in: fat(+) stap_56d28a51b3fe546293ca0700b10bcb29__8059(F) nfsv4 auth_rpcgss nfs dns_resolver fscache xt_nat iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack lockd sunrpc ppdev parport_pc parport microcode virtio_net i2c_piix4 drm_kms_helper ttm drm i2c_core [last unloaded: bid_shared] Pid: 8068, comm: modprobe Tainted: GF 3.7.0-0.rc8.git0.1.fc19.x86_64 #1 Call Trace: [<ffffffff8105e70f>] warn_slowpath_common+0x7f/0xc0 [<ffffffff81134106>] ? __probe_kernel_read+0x46/0x70 [<ffffffffa0180000>] ? 0xffffffffa017ffff [<ffffffffa0180000>] ? 0xffffffffa017ffff [<ffffffff8105e76a>] warn_slowpath_null+0x1a/0x20 [<ffffffff810fd189>] ftrace_bug+0x239/0x280 [<ffffffff810fd626>] ftrace_process_locs+0x376/0x520 [<ffffffff810fefb7>] ftrace_module_notify+0x47/0x50 [<ffffffff8163912d>] notifier_call_chain+0x4d/0x70 [<ffffffff810882f8>] __blocking_notifier_call_chain+0x58/0x80 [<ffffffff81088336>] blocking_notifier_call_chain+0x16/0x20 [<ffffffff810c2a23>] sys_init_module+0x73/0x220 [<ffffffff8163d719>] system_call_fastpath+0x16/0x1b ---[ end trace 9ef46351e53bbf80 ]--- ftrace failed to modify [<ffffffffa0180000>] init_once+0x0/0x20 [fat] actual: cc:bb:d2:4b:e1 A kprobe was added to the init_once() function in the fat module on load. But this happened before ftrace could have touched the code. As ftrace didn't run yet, the kprobe system had no idea it was a ftrace point and simply added a breakpoint to the code (0xcc in the cc:bb:d2:4b:e1). Then when ftrace went to modify the location from a call to mcount/fentry into a nop, it didn't see a call op, but instead it saw the breakpoint op and not knowing what to do with it, ftrace shut itself down. The solution is to simply give the ftrace module notifier the max priority. This should have been done regardless, as the core code ftrace modification also happens very early on in boot up. This makes the module modification closer to core modification. Link: http://lkml.kernel.org/r/20130107140333.593683061@goodmis.org Cc: stable@vger.kernel.org Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Reported-by: Frank Ch. Eigler <fche@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/trace/ftrace.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 3ffe4c5ad3f3..41473b4ad7a4 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -3998,7 +3998,7 @@ static int ftrace_module_notify(struct notifier_block *self,
struct notifier_block ftrace_module_nb = {
.notifier_call = ftrace_module_notify,
- .priority = 0,
+ .priority = INT_MAX, /* Run before anything that can use kprobes */
};
extern unsigned long __start_mcount_loc[];