[Bug uprobes/10595] uprobe probes causes selinux failures

["mjw at redhat dot com" <sourceware-bugzilla@sourceware.org>]

------- Additional Comments From mjw at redhat dot com  2009-09-03 20:13 -------
Roland made the observation that a private mapping of a file as executable is
allowed and that you can create one through shmem_file_setup (which has as an
extra benefit that /proc/<pid>/maps shows the mapping as /uprobes/ssol). That
seems to work.

Currently testing this patch:

diff --git a/runtime/uprobes2/uprobes.c b/runtime/uprobes2/uprobes.c
index 07ad398..195a79b 100644
--- a/runtime/uprobes2/uprobes.c
+++ b/runtime/uprobes2/uprobes.c
@@ -1387,6 +1387,7 @@ static noinline unsigned long
uprobe_setup_ssol_vma(unsigned long nbytes)
        unsigned long addr;
        struct mm_struct *mm;
        struct vm_area_struct *vma;
+       struct file *file;
 
        BUG_ON(nbytes & ~PAGE_MASK);
        if ((addr = find_old_ssol_vma()) != 0)
@@ -1403,8 +1404,8 @@ static noinline unsigned long
uprobe_setup_ssol_vma(unsigned long nbytes)
         */
        vma = rb_entry(rb_last(&mm->mm_rb), struct vm_area_struct, vm_rb);
        addr = vma->vm_end + PAGE_SIZE;
-       addr = do_mmap_pgoff(NULL, addr, nbytes, PROT_EXEC,
-                                       MAP_PRIVATE|MAP_ANONYMOUS, 0);
+        file = shmem_file_setup("uprobes/ssol", nbytes, VM_NORESERVE);
+       addr = do_mmap_pgoff(file, addr, nbytes, PROT_EXEC, MAP_PRIVATE, 0);
        if (addr & ~PAGE_MASK) {
                up_write(&mm->mmap_sem);
                mmput(mm);

-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=10595

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