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refuse the write to a read-only memory

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It was able to change a read-only memory using a system call that
forwarded to host.

To fix this, when read-only mmap(), it places read-only vm_area in the
mcexec's space.
This commit is contained in:
NAKAMURA Gou
2013-11-06 16:02:30 +09:00
parent 89be2af09a
commit bdc02bb687
4 changed files with 161 additions and 42 deletions
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14
kernel/process.c
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@@ -361,13 +361,14 @@ int free_process_memory_range(struct process_vm *vm, struct vm_range *range)
}
int remove_process_memory_range(struct process *process,
unsigned long start, unsigned long end)
unsigned long start, unsigned long end, int *ro_freedp)
{
struct process_vm * const vm = process->vm;
struct vm_range *range;
struct vm_range *next;
int error;
struct vm_range *freerange;
int ro_freed = 0;
dkprintf("remove_process_memory_range(%p,%lx,%lx)\n",
process, start, end);
@@ -401,6 +402,10 @@ int remove_process_memory_range(struct process *process,
}
}
if (!(freerange->flag & VR_PROT_WRITE)) {
ro_freed = 1;
}
error = free_process_memory_range(process->vm, freerange);
if (error) {
ekprintf("remove_process_memory_range(%p,%lx,%lx):"
@@ -411,8 +416,11 @@ int remove_process_memory_range(struct process *process,
}
dkprintf("remove_process_memory_range(%p,%lx,%lx): 0\n",
process, start, end);
if (ro_freedp) {
*ro_freedp = ro_freed;
}
dkprintf("remove_process_memory_range(%p,%lx,%lx): 0 %d\n",
process, start, end, ro_freed);
return 0;
}