Oleg Nesterov 7ba6db2d68 uprobes/x86: Emulate unconditional relative jmp's ... Currently we always execute all insns out-of-line, including relative jmp's and call's. This assumes that even if regs->ip points to nowhere after the single-step, default_post_xol_op(UPROBE_FIX_IP) logic will update it correctly. However, this doesn't work if this regs->ip == xol_vaddr + insn_offset is not canonical. In this case CPU generates #GP and general_protection() kills the task which tries to execute this insn out-of-line. Now that we have uprobe_xol_ops we can teach uprobes to emulate these insns and solve the problem. This patch adds branch_xol_ops which has a single branch_emulate_op() hook, so far it can only handle rel8/32 relative jmp's. TODO: move ->fixup into the union along with rip_rela_target_address. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Reported-by: Jonathan Lebon <jlebon@redhat.com> Reviewed-by: Jim Keniston <jkenisto@us.ibm.com>		2014-04-17 21:58:22 +02:00
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asm	uprobes/x86: Emulate unconditional relative jmp's	2014-04-17 21:58:22 +02:00
uapi/asm	Merge tag 'kvm-3.15-1' of git://git.kernel.org/pub/scm/virt/kvm/kvm	2014-04-02 14:50:10 -07:00