Naveen N. Rao c05b8c4474 powerpc/kprobes: Skip livepatch_handler() for jprobes ... ftrace_caller() depends on a modified regs->nip to detect if a certain function has been livepatched. However, with KPROBES_ON_FTRACE, it is possible for regs->nip to have been modified by the kprobes pre_handler (jprobes, for instance). In this case, we do not want to invoke the livepatch_handler so as not to consume the livepatch stack. To distinguish between the two (kprobes and livepatch), we check if there is an active kprobe on the current function. If there is, then we know for sure that it must have modified the NIP as we don't support livepatching a kprobe'd function. In this case, we simply skip the livepatch_handler and branch to the new NIP. Otherwise, the livepatch_handler is invoked. Fixes: ead514d5fb ("powerpc/kprobes: Add support for KPROBES_ON_FTRACE") Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>		2017-06-16 19:49:43 +10:00
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asm	powerpc/kprobes: Skip livepatch_handler() for jprobes	2017-06-16 19:49:43 +10:00
uapi/asm	powerpc: Add PPC_FEATURE userspace bits for SCV and DARN instructions	2017-05-25 23:07:45 +10:00