HostDrivers

Timestamp:

Oct 20, 2023 3:15:20 PM (14 months ago)

Author:

vboxsync

Message:

SUPDrv: Try explain r159602. bugref:8864

File:

trunk/src/VBox/HostDrivers/Support/linux/SUPDrv-linux.c

-              r101526
+              r101527
+{
     uint32_t fFlags = 0;
+    /* Note! bird 2023-10-20: Apparently, with CONFIG_PAX_KERNEXEC these days,
+             not only is the regular GDT read-only, but the one returned by
+             get_current_gdt_rw() is also read-only despite the name.
+             We don't know exactly when this started, or if it was always like
+             this, but getting hold of the relevant patches isn't all that
+             straight forward any longer it seems (which is weird for linux
+             patches), so, we've just enabled slow-mode for all PAX_KERNEXEC
+             kernels regardless of kernel version. */
 #ifdef CONFIG_PAX_KERNEXEC
     fFlags |= SUPKERNELFEATURES_GDT_READ_ONLY;
 …
     fFlags |= SUPKERNELFEATURES_GDT_NEED_WRITABLE;
 #endif
 #if defined(VBOX_STRICT) || defined(VBOX_WITH_EFLAGS_AC_SET_IN_VBOXDRV)
     fFlags |= SUPKERNELFEATURES_SMAP;

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