From: Oleg Nesterov Date: Sat, 5 Apr 2014 18:05:02 +0000 (+0200) Subject: uprobes/x86: Emulate unconditional relative jmp's X-Git-Tag: omap-for-v3.16/fixes-against-rc1~34^2~40^2~4 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7ba6db2d688bdf83049a18c8e55b2d1e58e8b0bc;p=pandora-kernel.git 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 Reported-by: Jonathan Lebon Reviewed-by: Jim Keniston --- Reading git-diff-tree failed