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Oleg Nesterov c1914a0936 uprobes: Install_breakpoint() should fail if is_swbp_insn() == T 
install_breakpoint() returns -EEXIST if is_swbp_insn(orig_insn)
== T, the caller treats this code as success.

This is doubly wrong. The successful return should set
UPROBE_COPY_INSN, but the real problem is that it shouldn't
succeed. If the probed insn is int3 the application should get
SIGTRAP, this won't happen with uprobe.

Probably we can fix this, we can add the UPROBE_SHARED_BP flag
and teach handle_swbp/set_orig_insn to handle this case
correctly. But this needs some complications and we have other
insns which can't be probed, lets make a simple fix for now.

I think this needs a cleanup. UPROBE_COPY_INSN should die,
copy_insn() should be called by alloc_uprobe().
arch_uprobe_analyze_insn() depends on ->mm (ia32_compat) but it
is called only once.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Anton Arapov <anton@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20120615154331.GA9578@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-06-16 09:10:43 +02:00
..
debug
events uprobes: Install_breakpoint() should fail if is_swbp_insn() == T 2012-06-16 09:10:43 +02:00
gcov
irq Merge branches 'irq-urgent-for-linus' and 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-06-04 11:36:51 -07:00
power PM / Hibernate: Use get_gendisk to verify partition if resume_file is integer format 2012-05-18 20:44:59 +02:00
sched Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-06-08 14:59:29 -07:00
time Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-06-08 09:11:33 -07:00
trace Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-05-30 11:12:00 -07:00
.gitignore
acct.c
async.c
audit.c
audit.h
audit_tree.c
audit_watch.c
auditfilter.c
auditsc.c seccomp: remove duplicated failure logging 2012-04-14 11:13:20 +10:00
backtracetest.c
bounds.c
capability.c userns: Teach inode_capable to understand inodes whose uids map to other namespaces. 2012-05-15 14:59:24 -07:00
cgroup.c Merge branch 'for-3.5-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup 2012-06-05 11:54:12 -07:00
cgroup_freezer.c
compat.c new helper: sigsuspend() 2012-05-21 23:52:30 -04:00
configs.c
cpu.c kernel/cpu.c: document clear_tasks_mm_cpumask() 2012-05-31 17:49:30 -07:00
cpu_pm.c kernel/cpu_pm.c: fix various typos 2012-05-31 17:49:27 -07:00
cpuset.c Merge branch 'for-3.5' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup 2012-05-22 17:40:19 -07:00
crash_dump.c
cred.c keys: kill task_struct->replacement_session_keyring 2012-05-23 22:11:41 -04:00
delayacct.c
dma.c
elfcore.c
exec_domain.c
exit.c Revert "mm: correctly synchronize rss-counters at exit/exec" 2012-06-07 17:54:07 -07:00
extable.c extable: Skip sorting if sorted at build time. 2012-04-19 15:06:55 -07:00
fork.c Revert "mm: correctly synchronize rss-counters at exit/exec" 2012-06-07 17:54:07 -07:00
freezer.c
futex.c
futex_compat.c
groups.c userns: Convert in_group_p and in_egroup_p to use kgid_t 2012-05-03 03:29:33 -07:00
hrtimer.c
hung_task.c hung task debugging: Inject NMI when hung and going to panic 2012-04-25 12:39:25 +02:00
irq_work.c irq_work: fix compile failure on tile from missing include 2012-04-13 13:15:16 -04:00
itimer.c itimer: Use printk_once instead of WARN_ONCE 2012-04-10 11:00:30 +02:00
jump_label.c
kallsyms.c vsprintf: fix %ps on non symbols when using kallsyms 2012-05-29 16:22:32 -07:00
kcmp.c syscalls, x86: add __NR_kcmp syscall 2012-05-31 17:49:32 -07:00
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kexec.c
kfifo.c [media] kernel:kfifo: export __kfifo_max_r symbol 2012-04-11 18:24:37 -03:00
kmod.c kmod.c: fix kernel-doc warning 2012-05-31 17:49:28 -07:00
kprobes.c
ksysfs.c
kthread.c
latencytop.c
lglock.c brlocks/lglocks: turn into functions 2012-05-29 23:28:41 -04:00
lockdep.c
lockdep_internals.h
lockdep_proc.c
lockdep_states.h
Makefile Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-06-01 10:34:35 -07:00
module.c Guard check in module loader against integer overflow 2012-05-23 22:28:53 +09:30
mutex-debug.c
mutex-debug.h
mutex.c
mutex.h
notifier.c
nsproxy.c
padata.c
panic.c panic: fix stack dump print on direct call to panic() 2012-04-12 13:12:12 -07:00
params.c params: replace printk(KERN_<LVL>...) with pr_<lvl>(...) 2012-05-04 17:28:18 -07:00
pid.c mm: add a low limit to alloc_large_system_hash 2012-05-24 00:28:21 -04:00
pid_namespace.c sysctl: make kernel.ns_last_pid control dependent on CHECKPOINT_RESTORE 2012-05-31 17:49:32 -07:00
posix-cpu-timers.c
posix-timers.c
printk.c printk() - isolate KERN_CONT users from ordinary complete lines 2012-05-14 12:36:45 -07:00
profile.c
ptrace.c userns: Convert ptrace, kill, set_priority permission checks to work with kuids and kgids 2012-05-03 03:28:51 -07:00
range.c
rcu.h
rcupdate.c rcu: Make exit_rcu() more precise and consolidate 2012-05-02 14:48:27 -07:00
rcutiny.c
rcutiny_plugin.h rcu: Make exit_rcu() more precise and consolidate 2012-05-02 14:48:27 -07:00
rcutorture.c rcu: Add rcutorture test for call_srcu() 2012-04-30 10:48:26 -07:00
rcutree.c Merge branch 'rcu/next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu 2012-05-14 08:41:46 +02:00
rcutree.h Merge branches 'barrier.2012.05.09a', 'fixes.2012.04.26a', 'inline.2012.05.02b' and 'srcu.2012.05.07b' into HEAD 2012-05-11 10:14:21 -07:00
rcutree_plugin.h Merge branches 'barrier.2012.05.09a', 'fixes.2012.04.26a', 'inline.2012.05.02b' and 'srcu.2012.05.07b' into HEAD 2012-05-11 10:14:21 -07:00
rcutree_trace.c rcu: Make rcu_barrier() less disruptive 2012-05-09 14:27:54 -07:00
relay.c
res_counter.c rescounters: add res_counter_uncharge_until() 2012-05-29 16:22:27 -07:00
resource.c kernel/resource.c: correct the comment of allocate_resource() 2012-05-31 17:49:26 -07:00
rtmutex-debug.c
rtmutex-debug.h
rtmutex-tester.c
rtmutex.c
rtmutex.h
rtmutex_common.h
rwsem.c
seccomp.c seccomp: fix build warnings when there is no CONFIG_SECCOMP_FILTER 2012-04-18 12:24:52 +10:00
semaphore.c semaphore: fix improper comment reference to mutex 2012-04-05 17:15:55 -07:00
signal.c new helper: signal_delivered() 2012-06-01 12:58:52 -04:00
smp.c smp: Implement kick_all_cpus_sync() 2012-05-08 12:35:06 +02:00
smpboot.c smpboot, idle: Fix comment mismatch over idle_threads_init() 2012-05-24 22:58:08 +02:00
smpboot.h smp: Fix idle_thread_init() inline stub 2012-05-04 12:52:25 +02:00
softirq.c
spinlock.c
srcu.c rcu: Implement per-domain single-threaded call_srcu() state machine 2012-04-30 10:48:25 -07:00
stacktrace.c
stop_machine.c
sys.c c/r: prctl: drop VMA flags test on PR_SET_MM_ stack data assignment 2012-06-07 14:43:55 -07:00
sys_ni.c syscalls, x86: add __NR_kcmp syscall 2012-05-31 17:49:32 -07:00
sysctl.c
sysctl_binary.c
task_work.c task_work_add: generic process-context callbacks 2012-05-23 22:09:21 -04:00
taskstats.c
test_kprobes.c
time.c
timeconst.pl
timer.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2012-05-23 17:42:39 -07:00
tracepoint.c
tsacct.c
uid16.c userns: Convert setting and getting uid and gid system calls to use kuid and kgid 2012-05-03 03:28:41 -07:00
up.c
user-return-notifier.c
user.c userns: Silence silly gcc warning. 2012-05-19 15:44:40 -06:00
user_namespace.c userns: Store uid and gid values in struct cred with kuid_t and kgid_t types 2012-05-03 03:28:38 -07:00
utsname.c userns: Use cred->user_ns instead of cred->user->user_ns 2012-04-07 16:55:51 -07:00
utsname_sysctl.c
wait.c
watchdog.c watchdog: add check for suspended vm in softlockup detector 2012-04-08 12:49:03 +03:00
workqueue.c lockdep: fix oops in processing workqueue 2012-05-15 08:08:31 -07:00
workqueue_sched.h