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| author | Oleg Nesterov <oleg@redhat.com> | 2012-09-16 19:07:41 +0200 |
|---|---|---|
| committer | Oleg Nesterov <oleg@redhat.com> | 2012-09-29 21:21:53 +0200 |
| commit | 78a320542e6cdb2800cd736b2d136e4261d34f43 (patch) | |
| tree | eb55bec46370f7890fdec4c44450e52aba043885 | |
| parent | 75ed82ea53bd0d2d8083261123576250f7ba851e (diff) | |
| download | op-kernel-dev-78a320542e6cdb2800cd736b2d136e4261d34f43.zip op-kernel-dev-78a320542e6cdb2800cd736b2d136e4261d34f43.tar.gz | |
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>
| -rw-r--r-- | kernel/events/uprobes.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 80e8c7b..a9de408 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -106,8 +106,8 @@ static bool valid_vma(struct vm_area_struct *vma, bool is_register) if (!is_register) return true; - if ((vma->vm_flags & (VM_HUGETLB|VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)) - == (VM_READ|VM_EXEC)) + if ((vma->vm_flags & (VM_HUGETLB | VM_WRITE | VM_MAYEXEC | VM_SHARED)) + == VM_MAYEXEC) return true; return false; |
