d2ebb8143b
[ Upstream commit 749b94b08005929bbc636df21a23322733166e35 ]
After unloading a module, we must reset the linear mapping permissions,
see the example below:
Before unloading a module:
0xffffaf809d65d000-0xffffaf809d6dc000 0x000000011d65d000 508K PTE . .. .. D A G . . W R V
0xffffaf809d6dc000-0xffffaf809d6dd000 0x000000011d6dc000 4K PTE . .. .. D A G . . . R V
0xffffaf809d6dd000-0xffffaf809d6e1000 0x000000011d6dd000 16K PTE . .. .. D A G . . W R V
0xffffaf809d6e1000-0xffffaf809d6e7000 0x000000011d6e1000 24K PTE . .. .. D A G . X . R V
After unloading a module:
0xffffaf809d65d000-0xffffaf809d6e1000 0x000000011d65d000 528K PTE . .. .. D A G . . W R V
0xffffaf809d6e1000-0xffffaf809d6e7000 0x000000011d6e1000 24K PTE . .. .. D A G . X W R V
The last mapping is not reset and we end up with WX mappings in the linear
mapping.
So add VM_FLUSH_RESET_PERMS to our module_alloc() definition.
Fixes:
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|---|---|---|
| .. | ||
| compat_vdso | ||
| probes | ||
| vdso | ||
| .gitignore | ||
| Makefile | ||
| alternative.c | ||
| asm-offsets.c | ||
| cacheinfo.c | ||
| compat_signal.c | ||
| compat_syscall_table.c | ||
| cpu-hotplug.c | ||
| cpu.c | ||
| cpu_ops.c | ||
| cpu_ops_sbi.c | ||
| cpu_ops_spinwait.c | ||
| cpufeature.c | ||
| crash_dump.c | ||
| crash_save_regs.S | ||
| efi-header.S | ||
| efi.c | ||
| elf_kexec.c | ||
| entry.S | ||
| fpu.S | ||
| ftrace.c | ||
| head.S | ||
| head.h | ||
| image-vars.h | ||
| irq.c | ||
| jump_label.c | ||
| kexec_relocate.S | ||
| kgdb.c | ||
| machine_kexec.c | ||
| machine_kexec_file.c | ||
| mcount-dyn.S | ||
| mcount.S | ||
| module-sections.c | ||
| module.c | ||
| patch.c | ||
| perf_callchain.c | ||
| perf_regs.c | ||
| process.c | ||
| ptrace.c | ||
| reset.c | ||
| riscv_ksyms.c | ||
| sbi.c | ||
| setup.c | ||
| signal.c | ||
| smp.c | ||
| smpboot.c | ||
| soc.c | ||
| stacktrace.c | ||
| suspend.c | ||
| suspend_entry.S | ||
| sys_riscv.c | ||
| syscall_table.c | ||
| time.c | ||
| trace_irq.c | ||
| trace_irq.h | ||
| traps.c | ||
| traps_misaligned.c | ||
| vdso.c | ||
| vmlinux-xip.lds.S | ||
| vmlinux.lds.S | ||