VMMR0JmpA-amd64.asm

Timestamp:

Jul 14, 2021 9:45:39 AM (4 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

145694

Message:

VMM/VMMR0JmpA-amd64.asm: Another stack fuzz adjustment for linux 5.13. bugref:10064 ticketref:20090 ticketref:20456

File:

trunk/src/VBox/VMM/VMMR0/VMMR0JmpA-amd64.asm

-              r90173
+              r90177
 ;; Workaround for linux 4.6 fast/slow syscall stack depth difference.
+;; Update: This got worse with linux 5.13. See bugref:10064.
+;; Update: This got worse with linux 5.13 and CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT.
+;;         The x86 arch_exit_to_user_mode_prepare code limits the offset to 255,
+;;         while the generic limit is 1023.  See bugref:10064 for details.
 %ifdef VMM_R0_SWITCH_STACK
  %define STACK_FUZZ_SIZE 0
 %else
+ %define STACK_FUZZ_SIZE 256
+ %ifdef RT_OS_LINUX
+  %define STACK_FUZZ_SIZE 384
+ %else
+  %define STACK_FUZZ_SIZE 128
+ %endif
 %endif

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