powerpc/mm: Detect instruction fetch denied and report (1d18ad02) · Commits · 戴 / test

ISA 3 allows for prevention of instruction fetch and execution of user mode pages. If such an error occurs, SRR1 bit 35 reports the error. We catch and report the error in do_page_fault(). Signed-off-by:

Balbir Singh <bsingharora@gmail.com> Signed-off-by:

Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/mm/fault.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -390,6 +390,12 @@ good_area:
		#endif /* CONFIG_8xx */

		if (is_exec) {
		/*
		* An execution fault + no execute ?
		*/
		if (regs->msr & SRR1_ISI_N_OR_G)
		goto bad_area;

		/*
		* Allow execution from readable areas if the MMU does not
		* provide separate controls over reading and executing.
		@@ -404,6 +410,7 @@ good_area:
		(cpu_has_feature(CPU_FTR_NOEXECUTE) \|\|
		!(vma->vm_flags & (VM_READ \| VM_WRITE))))
		goto bad_area;

		#ifdef CONFIG_PPC_STD_MMU
		/*
		* protfault should only happen due to us

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