uprobes: Change valid_vma() to demand VM_MAYEXEC rather than VM_EXEC
uprobe_register() or uprobe_mmap() requires VM_READ | VM_EXEC, this is not right. An apllication can do mprotect(PROT_EXEC) later and execute this code. Change valid_vma(is_register => true) to check VM_MAYEXEC instead. No need to check VM_MAYREAD, it is always set. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
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@ -106,8 +106,8 @@ static bool valid_vma(struct vm_area_struct *vma, bool is_register)
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if (!is_register)
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return true;
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if ((vma->vm_flags & (VM_HUGETLB|VM_READ|VM_WRITE|VM_EXEC|VM_SHARED))
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== (VM_READ|VM_EXEC))
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if ((vma->vm_flags & (VM_HUGETLB | VM_WRITE | VM_MAYEXEC | VM_SHARED))
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== VM_MAYEXEC)
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return true;
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return false;
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