On 07/06/2016 05:21 PM, Andy Lutomirski wrote:
On Wed, Jun 29, 2016 at 3:57 AM, Dmitry Safonov <dsafonov@xxxxxxxxxxxxx> wrote:
Make in-kernel API to map vDSO blobs on x86.
I think the addr calculation was already confusing and is now even
worse. How about simplifying it? Get rid of calculate_addr entirely
and push the vdso_addr calls into arch_setup_additional_pages, etc.
Then just use addr directly in the map_vdso code.
Thanks, will do.
+int do_map_vdso(vdso_type type, unsigned long addr, bool randomize_addr)
{
- if (vdso32_enabled != 1) /* Other values all mean "disabled" */
- return 0;
-
- return map_vdso(&vdso_image_32, false);
-}
+ switch (type) {
+#if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION)
+ case VDSO_32:
+ if (vdso32_enabled != 1) /* Other values all mean "disabled" */
+ return 0;
+ /* vDSO aslr turned off for i386 vDSO */
+ return map_vdso(&vdso_image_32, addr, false);
+#endif
+#ifdef CONFIG_X86_64
+ case VDSO_64:
+ if (!vdso64_enabled)
+ return 0;
+ return map_vdso(&vdso_image_64, addr, randomize_addr);
+#endif
+#ifdef CONFIG_X86_X32_ABI
+ case VDSO_X32:
+ if (!vdso64_enabled)
+ return 0;
+ return map_vdso(&vdso_image_x32, addr, randomize_addr);
#endif
+ default:
+ return -EINVAL;
+ }
+}
Why is this better than just passing the vdso_image pointer in?
Hmm, then all callers should be under the same ifdefs as vdso_image
blobs. Ok, will do.
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