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execve(): clear host user-space PTEs before context switching

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This commit is contained in:
Balazs Gerofi bgerofi@riken.jp
2014-07-28 15:34:58 +09:00
parent 07b07476b7
commit c83e80ad91
4 changed files with 72 additions and 11 deletions
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24
kernel/syscall.c
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@ -1228,6 +1228,11 @@ SYSCALL_DECLARE(execve)
/* Unmap all memory areas of the process, userspace will be gone */
free_process_memory_ranges(cpu_local_var(current));
ihk_mc_init_user_process(&cpu_local_var(current)->ctx,
&cpu_local_var(current)->uctx,
((char *)cpu_local_var(current)) +
KERNEL_STACK_NR_PAGES * PAGE_SIZE, desc->entry, 0);
/* Create virtual memory ranges and update args/envs */
if (prepare_process_ranges_args_envs(cpu_local_var(current), desc, desc,
PTATTR_NO_EXECUTE | PTATTR_WRITABLE | PTATTR_FOR_USER,
@ -1235,6 +1240,18 @@ SYSCALL_DECLARE(execve)
kprintf("execve(): PANIC: preparing ranges, args, envs, stack\n");
panic("");
}
/* Clear host user space PTEs */
request.number = __NR_munmap;
request.args[0] = cpu_local_var(current)->vm->region.user_start;
request.args[1] = cpu_local_var(current)->vm->region.user_end -
cpu_local_var(current)->vm->region.user_start;
dkprintf("execve(): requesting host PTE clear\n");
if (do_syscall(&request, ctx, ihk_mc_get_processor_id(), 0)) {
kprintf("execve(): ERROR: clearing PTEs in host process\n");
panic("");
}
/* Request host to transfer ELF image */
request.number = __NR_execve;
@ -1250,8 +1267,13 @@ SYSCALL_DECLARE(execve)
panic("");
}
dkprintf("execve(): returning to new process\n");
/* Switch to new execution context */
dkprintf("execve(): switching to new process\n");
ihk_mc_switch_context(NULL, &cpu_local_var(current)->ctx,
cpu_local_var(current));
/* Never reach here */
return 0;
}