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86131c71b1
Hitting an uretprobe in a s390x TCG guest causes a SIGSEGV. What happens is: * uretprobe maps a userspace page containing an invalid instruction. * uretprobe replaces the target function's return address with the address of that page. * When tb_gen_code() is called on that page, tb->size ends up being 0 (because the page starts with the invalid instruction), which causes virt_page2 to point to the previous page. * The previous page is not mapped, so this causes a spurious translation exception. tb->size must never be 0: even if there is an illegal instruction, the instruction bytes that have been looked at must count towards tb->size. So adjust s390x's translate_one() to act this way for both illegal instructions and instructions that are known to generate exceptions. Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Reviewed-by: David Hildenbrand <david@redhat.com> Message-Id: <20210416154939.32404-2-iii@linux.ibm.com> Signed-off-by: Cornelia Huck <cohuck@redhat.com> |
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| .. | ||
| arch_dump.c | ||
| cc_helper.c | ||
| cpu_features_def.h | ||
| cpu_features_def.h.inc | ||
| cpu_features.c | ||
| cpu_features.h | ||
| cpu_models.c | ||
| cpu_models.h | ||
| cpu-param.h | ||
| cpu-qom.h | ||
| cpu.c | ||
| cpu.h | ||
| crypto_helper.c | ||
| diag.c | ||
| excp_helper.c | ||
| fpu_helper.c | ||
| gdbstub.c | ||
| gen-features.c | ||
| helper.c | ||
| helper.h | ||
| insn-data.def | ||
| insn-format.def | ||
| int_helper.c | ||
| internal.h | ||
| interrupt.c | ||
| ioinst.c | ||
| kvm_s390x.h | ||
| kvm-stub.c | ||
| kvm.c | ||
| machine.c | ||
| mem_helper.c | ||
| meson.build | ||
| misc_helper.c | ||
| mmu_helper.c | ||
| s390-tod.h | ||
| sigp.c | ||
| tcg_s390x.h | ||
| tcg-stub.c | ||
| trace-events | ||
| trace.h | ||
| translate_vx.c.inc | ||
| translate.c | ||
| vec_fpu_helper.c | ||
| vec_helper.c | ||
| vec_int_helper.c | ||
| vec_string_helper.c | ||
| vec.h | ||