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x86/entry_32: Add VERW just before userspace transition
commit a0e2dab44d
upstream.
As done for entry_64, add support for executing VERW late in exit to
user path for 32-bit mode.
Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://lore.kernel.org/all/20240213-delay-verw-v8-3-a6216d83edb7%40linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
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commit
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1 changed files with 3 additions and 0 deletions
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@ -885,6 +885,7 @@ SYM_FUNC_START(entry_SYSENTER_32)
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BUG_IF_WRONG_CR3 no_user_check=1
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popfl
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popl %eax
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CLEAR_CPU_BUFFERS
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/*
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* Return back to the vDSO, which will pop ecx and edx.
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@ -954,6 +955,7 @@ restore_all_switch_stack:
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/* Restore user state */
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RESTORE_REGS pop=4 # skip orig_eax/error_code
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CLEAR_CPU_BUFFERS
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.Lirq_return:
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/*
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* ARCH_HAS_MEMBARRIER_SYNC_CORE rely on IRET core serialization
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@ -1146,6 +1148,7 @@ SYM_CODE_START(asm_exc_nmi)
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/* Not on SYSENTER stack. */
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call exc_nmi
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CLEAR_CPU_BUFFERS
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jmp .Lnmi_return
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.Lnmi_from_sysenter_stack:
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