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| author | Joerg Roedel <jroedel@suse.de> | 2021-03-03 15:17:12 +0100 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2021-03-08 14:22:17 +0100 |
| commit | 78a81d88f60ba773cbe890205e1ee67f00502948 (patch) | |
| tree | d1f24b0b047de5c66ca0fe361c3fd6492e3952df /arch/x86/kernel/traps.c | |
| parent | 5d5675df792ff67e74a500c4c94db0f99e6a10ef (diff) | |
| download | lwn-78a81d88f60ba773cbe890205e1ee67f00502948.tar.gz lwn-78a81d88f60ba773cbe890205e1ee67f00502948.zip | |
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/kernel/traps.c')
| -rw-r--r-- | arch/x86/kernel/traps.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index 7f5aec758f0e..ac1874a2a70e 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -694,8 +694,7 @@ asmlinkage __visible noinstr struct pt_regs *vc_switch_off_ist(struct pt_regs *r * In the SYSCALL entry path the RSP value comes from user-space - don't * trust it and switch to the current kernel stack */ - if (regs->ip >= (unsigned long)entry_SYSCALL_64 && - regs->ip < (unsigned long)entry_SYSCALL_64_safe_stack) { + if (ip_within_syscall_gap(regs)) { sp = this_cpu_read(cpu_current_top_of_stack); goto sync; } |