I am attaching a reproducer image and script. Unpatched execution ends like this:
... TAP TEST START 1..2 not ok 1 NonExecutable::ElfDataIsNotExecutable # Assertion failed /home/jermar/Kernkonzept/software/l4/pkg/l4re-core/test/moe/test_nx.cc:103 # Expected: -(L4_EIPC_LO + l4_ipc_error(tag, l4_utcb())) >= 0 # Actual: -2003 (Receive timeout) # There was no IPC error. # Assertion failed /home/jermar/Kernkonzept/software/l4/pkg/l4re-core/test/moe/test_nx.cc:125 # Expected equality of these values: # pfa # Which is: 360 # (l4_addr_t)execute_data # Which is: 17633344 # The page fault occured at the expected location. not ok 2 NonExecutable::StackIsNotExecutable # Assertion failed /home/jermar/Kernkonzept/software/l4/pkg/l4re-core/test/moe/test_nx.cc:103 # Expected: -(L4_EIPC_LO + l4_ipc_error(tag, l4_utcb())) >= 0 # Actual: -2003 (Receive timeout) # There was no IPC error. # Assertion failed /home/jermar/Kernkonzept/software/l4/pkg/l4re-core/test/moe/test_nx.cc:144 # Expected equality of these values: # pfa # Which is: 4358144 # stack_func # Which is: 4276000 # The page fault occured at the expected location. TAP TEST FINISHED With the proposed patch applied, the execution should end with something like this: ... TAP TEST START 1..2 ok 1 NonExecutable::ElfDataIsNotExecutable ok 2 NonExecutable::StackIsNotExecutable TAP TEST FINISHED ** Attachment added: "Image and script for reproducing this bug." https://bugs.launchpad.net/qemu/+bug/1825311/+attachment/5258264/+files/reproducer.tar.xz -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1825311 Title: mips_cpu_handle_mmu_fault renders all accessed pages executable Status in QEMU: New Bug description: On MIPS, data accesses to pages mapped in the TLB result in mips_cpu_handle_mmu_fault() marking the page unconditionally executable, even if the TLB entry has the XI bit set. Later on, when there is an attempt to execute this page, no exception is generated, even though TLBXI is expected. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1825311/+subscriptions
