Re: [PATCH v3 2/6] x86/entry_64: Add VERW just before userspace transition

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On 25.10.23 г. 23:52 ч., Pawan Gupta wrote:

<snip>

@@ -1520,6 +1530,7 @@ SYM_CODE_START(ignore_sysret)
  	UNWIND_HINT_END_OF_STACK
  	ENDBR
  	mov	$-ENOSYS, %eax
+	CLEAR_CPU_BUFFERS

nit: Just out of curiosity is it really needed in this case or it's doesn for the sake of uniformity so that all ring3 transitions are indeed covered??

  	sysretl
  SYM_CODE_END(ignore_sysret)
  #endif
diff --git a/arch/x86/entry/entry_64_compat.S b/arch/x86/entry/entry_64_compat.S
index 70150298f8bd..245697eb8485 100644
--- a/arch/x86/entry/entry_64_compat.S
+++ b/arch/x86/entry/entry_64_compat.S
@@ -271,6 +271,7 @@ SYM_INNER_LABEL(entry_SYSRETL_compat_unsafe_stack, SYM_L_GLOBAL)
  	xorl	%r9d, %r9d
  	xorl	%r10d, %r10d
  	swapgs
+	CLEAR_CPU_BUFFERS
  	sysretl
  SYM_INNER_LABEL(entry_SYSRETL_compat_end, SYM_L_GLOBAL)
  	ANNOTATE_NOENDBR





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