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authorJoerg Roedel <jroedel@suse.de>2021-03-03 17:17:12 +0300
committerBorislav Petkov <bp@suse.de>2021-03-08 16:22:17 +0300
commit78a81d88f60ba773cbe890205e1ee67f00502948 (patch)
treed1f24b0b047de5c66ca0fe361c3fd6492e3952df /arch/x86/entry
parent5d5675df792ff67e74a500c4c94db0f99e6a10ef (diff)
downloadlinux-78a81d88f60ba773cbe890205e1ee67f00502948.tar.xz
x86/sev-es: Introduce ip_within_syscall_gap() helper
Introduce a helper to check whether an exception came from the syscall gap and use it in the SEV-ES code. Extend the check to also cover the compatibility SYSCALL entry path. Fixes: 315562c9af3d5 ("x86/sev-es: Adjust #VC IST Stack on entering NMI handler") Signed-off-by: Joerg Roedel <jroedel@suse.de> Signed-off-by: Borislav Petkov <bp@suse.de> Cc: stable@vger.kernel.org # 5.10+ Link: https://lkml.kernel.org/r/20210303141716.29223-2-joro@8bytes.org
Diffstat (limited to 'arch/x86/entry')
-rw-r--r--arch/x86/entry/entry_64_compat.S2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/entry/entry_64_compat.S b/arch/x86/entry/entry_64_compat.S
index 541fdaf64045..0051cf5c792d 100644
--- a/arch/x86/entry/entry_64_compat.S
+++ b/arch/x86/entry/entry_64_compat.S
@@ -210,6 +210,8 @@ SYM_CODE_START(entry_SYSCALL_compat)
/* Switch to the kernel stack */
movq PER_CPU_VAR(cpu_current_top_of_stack), %rsp
+SYM_INNER_LABEL(entry_SYSCALL_compat_safe_stack, SYM_L_GLOBAL)
+
/* Construct struct pt_regs on stack */
pushq $__USER32_DS /* pt_regs->ss */
pushq %r8 /* pt_regs->sp */