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uti: Prevent user space vma from getting copied when forking

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This commit is contained in:
Masamichi Takagi
2018-02-13 09:19:50 +09:00
parent 63703589e5
commit e29f579061
1 changed files with 9 additions and 1 deletions
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10
executer/kernel/mcctrl/syscall.c
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@@ -974,7 +974,15 @@ reserve_user_space_common(struct mcctrl_usrdata *usrdata, unsigned long start, u
start = vm_mmap(file, start, end, PROT_READ|PROT_WRITE|PROT_EXEC, start = vm_mmap(file, start, end, PROT_READ|PROT_WRITE|PROT_EXEC,
MAP_FIXED|MAP_SHARED, 0); MAP_FIXED|MAP_SHARED, 0);
#endif #endif
#if 0
{ /* debug */
struct vm_area_struct *vma;
down_write(&current->mm->mmap_sem);
vma = find_vma(current->mm, start);
vma->vm_flags |= VM_DONTCOPY;
up_write(&current->mm->mmap_sem);
}
#endif
revert_creds(original); revert_creds(original);
put_cred(promoted); put_cred(promoted);
fput(file); fput(file);