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uprobes: Send SIGILL if handle_trampoline() fails
1. It doesn't make sense to continue if handle_trampoline() fails, change handle_swbp() to always return after this call. 2. Turn pr_warn() into uprobe_warn(), and change handle_trampoline() to send SIGILL on failure. It is pointless to return to user mode with the corrupted instruction_pointer() which we can't restore. Tested-by: Pratyush Anand <panand@redhat.com> Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Acked-by: Anton Arapov <arapov@gmail.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20150721134008.GA4745@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -1770,7 +1770,7 @@ handle_uretprobe_chain(struct return_instance *ri, struct pt_regs *regs)
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up_read(&uprobe->register_rwsem);
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}
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static bool handle_trampoline(struct pt_regs *regs)
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static void handle_trampoline(struct pt_regs *regs)
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{
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struct uprobe_task *utask;
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struct return_instance *ri;
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@ -1778,11 +1778,11 @@ static bool handle_trampoline(struct pt_regs *regs)
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utask = current->utask;
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if (!utask)
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return false;
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goto sigill;
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ri = utask->return_instances;
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if (!ri)
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return false;
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goto sigill;
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/*
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* TODO: we should throw out return_instance's invalidated by
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@ -1804,8 +1804,12 @@ static bool handle_trampoline(struct pt_regs *regs)
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}
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utask->return_instances = ri;
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return;
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sigill:
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uprobe_warn(current, "handle uretprobe, sending SIGILL.");
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force_sig_info(SIGILL, SEND_SIG_FORCED, current);
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return true;
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}
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bool __weak arch_uprobe_ignore(struct arch_uprobe *aup, struct pt_regs *regs)
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@ -1824,13 +1828,8 @@ static void handle_swbp(struct pt_regs *regs)
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int uninitialized_var(is_swbp);
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bp_vaddr = uprobe_get_swbp_addr(regs);
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if (bp_vaddr == get_trampoline_vaddr()) {
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if (handle_trampoline(regs))
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return;
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pr_warn("uprobe: unable to handle uretprobe pid/tgid=%d/%d\n",
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current->pid, current->tgid);
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}
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if (bp_vaddr == get_trampoline_vaddr())
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return handle_trampoline(regs);
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uprobe = find_active_uprobe(bp_vaddr, &is_swbp);
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if (!uprobe) {
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