selinux: generalize disabling of execmem for plt-in-heap archs

On Tue, 2010-04-27 at 11:47 -0700, David Miller wrote:
> From: "Tom \"spot\" Callaway" <tcallawa@redhat.com>
> Date: Tue, 27 Apr 2010 14:20:21 -0400
>
> > [root@apollo ~]$ cat /proc/2174/maps
> > 00010000-00014000 r-xp 00000000 fd:00 15466577
> >  /sbin/mingetty
> > 00022000-00024000 rwxp 00002000 fd:00 15466577
> >  /sbin/mingetty
> > 00024000-00046000 rwxp 00000000 00:00 0
> >  [heap]
>
> SELINUX probably barfs on the executable heap, the PLT is in the HEAP
> just like powerpc32 and that's why VM_DATA_DEFAULT_FLAGS has to set
> both executable and writable.
>
> You also can't remove the CONFIG_PPC32 ifdefs in selinux, since
> because of the VM_DATA_DEFAULT_FLAGS setting used still in that arch,
> the heap will always have executable permission, just like sparc does.
> You have to support those binaries forever, whether you like it or not.
>
> Let's just replace the CONFIG_PPC32 ifdef in SELINUX with CONFIG_PPC32
> || CONFIG_SPARC as in Tom's original patch and let's be done with
> this.
>
> In fact I would go through all the arch/ header files and check the
> VM_DATA_DEFAULT_FLAGS settings and add the necessary new ifdefs to the
> SELINUX code so that other platforms don't have the pain of having to
> go through this process too.

To avoid maintaining per-arch ifdefs, it seems that we could just
directly use (VM_DATA_DEFAULT_FLAGS & VM_EXEC) as the basis for deciding
whether to enable or disable these checks.   VM_DATA_DEFAULT_FLAGS isn't
constant on some architectures but instead depends on
current->personality, but we want this applied uniformly.  So we'll just
use the initial task state to determine whether or not to enable these
checks.

Signed-off-by:  Stephen Smalley <sds@tycho.nsa.gov>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: James Morris <jmorris@namei.org>

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index ebee467..a03fd74 100644 (file)
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2999,13 +2999,15 @@ static int selinux_file_ioctl(struct file *file, unsigned int cmd,
        return file_has_perm(cred, file, av);
 }
 
+static int default_noexec;
+
 static int file_map_prot_check(struct file *file, unsigned long prot, int shared)
 {
        const struct cred *cred = current_cred();
        int rc = 0;
 
-#ifndef CONFIG_PPC32
-       if ((prot & PROT_EXEC) && (!file || (!shared && (prot & PROT_WRITE)))) {
+       if (default_noexec &&
+           (prot & PROT_EXEC) && (!file || (!shared && (prot & PROT_WRITE)))) {
                /*
                 * We are making executable an anonymous mapping or a
                 * private file mapping that will also be writable.
@@ -3015,7 +3017,6 @@ static int file_map_prot_check(struct file *file, unsigned long prot, int shared
                if (rc)
                        goto error;
        }
-#endif
 
        if (file) {
                /* read access is always possible with a mapping */
@@ -3076,8 +3077,8 @@ static int selinux_file_mprotect(struct vm_area_struct *vma,
        if (selinux_checkreqprot)
                prot = reqprot;
 
-#ifndef CONFIG_PPC32
-       if ((prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) {
+       if (default_noexec &&
+           (prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) {
                int rc = 0;
                if (vma->vm_start >= vma->vm_mm->start_brk &&
                    vma->vm_end <= vma->vm_mm->brk) {
@@ -3099,7 +3100,6 @@ static int selinux_file_mprotect(struct vm_area_struct *vma,
                if (rc)
                        return rc;
        }
-#endif
 
        return file_map_prot_check(vma->vm_file, prot, vma->vm_flags&VM_SHARED);
 }
@@ -5662,6 +5662,8 @@ static __init int selinux_init(void)
        /* Set the security state for the initial task. */
        cred_init_security();
 
+       default_noexec = !(VM_DATA_DEFAULT_FLAGS & VM_EXEC);
+
        sel_inode_cache = kmem_cache_create("selinux_inode_security",
                                            sizeof(struct inode_security_struct),
                                            0, SLAB_PANIC, NULL);