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authorTejun Heo <tj@kernel.org>2011-06-17 16:50:37 +0200
committerOleg Nesterov <oleg@redhat.com>2011-06-22 19:26:28 +0200
commita288eecce5253cc1565d400a52b9b476a157e040 (patch)
treea933dd8c9791be83b7a67a33502c79e7b441960e /arch/s390/kernel
parentf3c04b934d429b1ace21866f011b66de328c0dc9 (diff)
ptrace: kill trivial tracehooks
At this point, tracehooks aren't useful to mainline kernel and mostly just add an extra layer of obfuscation. Although they have comments, without actual in-kernel users, it is difficult to tell what are their assumptions and they're actually trying to achieve. To mainline kernel, they just aren't worth keeping around. This patch kills the following trivial tracehooks. * Ones testing whether task is ptraced. Replace with ->ptrace test. tracehook_expect_breakpoints() tracehook_consider_ignored_signal() tracehook_consider_fatal_signal() * ptrace_event() wrappers. Call directly. tracehook_report_exec() tracehook_report_exit() tracehook_report_vfork_done() * ptrace_release_task() wrapper. Call directly. tracehook_finish_release_task() * noop tracehook_prepare_release_task() tracehook_report_death() This doesn't introduce any behavior change. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Christoph Hellwig <hch@infradead.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Diffstat (limited to 'arch/s390/kernel')
-rw-r--r--arch/s390/kernel/traps.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
index a65d2e82f61d..a63d34c3611e 100644
--- a/arch/s390/kernel/traps.c
+++ b/arch/s390/kernel/traps.c
@@ -331,7 +331,7 @@ void __kprobes do_per_trap(struct pt_regs *regs)
{
if (notify_die(DIE_SSTEP, "sstep", regs, 0, 0, SIGTRAP) == NOTIFY_STOP)
return;
- if (tracehook_consider_fatal_signal(current, SIGTRAP))
+ if (current->ptrace)
force_sig(SIGTRAP, current);
}
@@ -425,7 +425,7 @@ static void __kprobes illegal_op(struct pt_regs *regs, long pgm_int_code,
if (get_user(*((__u16 *) opcode), (__u16 __user *) location))
return;
if (*((__u16 *) opcode) == S390_BREAKPOINT_U16) {
- if (tracehook_consider_fatal_signal(current, SIGTRAP))
+ if (current->ptrace)
force_sig(SIGTRAP, current);
else
signal = SIGILL;