Unlike Intel's Enhanced IBRS feature, AMD's Automatic IBRS does not provide protection to processes running at CPL3/user mode [1].

Explicitly enable STIBP to protect against cross-thread CPL3 branch target injections on systems with Automatic IBRS enabled.

Also update the relevant documentation.

The first version of the original AutoIBRS patchseries enabled STIBP always-on, but it got dropped by mistake in v2 and on.

[1] "AMD64 Architecture Programmer's Manual Volume 2: System Programming", Pub. 24593, rev. 3.41, June 2023, Part 1, Section 3.1.7 "Extended Feature Enable Register (EFER)" - accessible via Link.

Reported-by: Tom Lendacky thomas.lendacky@amd.com Fixes: e7862eda309e ("x86/cpu: Support AMD Automatic IBRS") Link: https://bugzilla.kernel.org/attachment.cgi?id=304652 Signed-off-by: Kim Phillips kim.phillips@amd.com Cc: Borislav Petkov (AMD) bp@alien8.de Cc: Boris Ostrovsky boris.ostrovsky@oracle.com Cc: Dave Hansen dave.hansen@linux.intel.com Cc: "H. Peter Anvin" hpa@zytor.com Cc: Ingo Molnar mingo@redhat.com Cc: Joao Martins joao.m.martins@oracle.com Cc: Jonathan Corbet corbet@lwn.net Cc: Konrad Rzeszutek Wilk konrad.wilk@oracle.com Cc: Paolo Bonzini pbonzini@redhat.com Cc: Sean Christopherson seanjc@google.com Cc: Thomas Gleixner tglx@linutronix.de Cc: David Woodhouse dwmw@amazon.co.uk Cc: Greg Kroah-Hartman gregkh@linuxfoundation.org Cc: Juergen Gross jgross@suse.com Cc: Peter Zijlstra peterz@infradead.org Cc: Tony Luck tony.luck@intel.com Cc: Tom Lendacky thomas.lendacky@amd.com Cc: Alexey Kardashevskiy aik@amd.com Cc: kvm@vger.kernel.org Cc: linux-doc@vger.kernel.org Cc: x86@kernel.org Cc: linux-kernel@vger.kernel.org Cc: stable@vger.kernel.org --- Documentation/admin-guide/hw-vuln/spectre.rst | 11 +++++++---- arch/x86/kernel/cpu/bugs.c | 15 +++++++++------ 2 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/Documentation/admin-guide/hw-vuln/spectre.rst b/Documentation/admin-guide/hw-vuln/spectre.rst index 4d186f599d90..32a8893e5617 100644 --- a/Documentation/admin-guide/hw-vuln/spectre.rst +++ b/Documentation/admin-guide/hw-vuln/spectre.rst @@ -484,11 +484,14 @@ Spectre variant 2

Systems which support enhanced IBRS (eIBRS) enable IBRS protection once at boot, by setting the IBRS bit, and they're automatically protected against - Spectre v2 variant attacks, including cross-thread branch target injections - on SMT systems (STIBP). In other words, eIBRS enables STIBP too. + Spectre v2 variant attacks.

- Legacy IBRS systems clear the IBRS bit on exit to userspace and - therefore explicitly enable STIBP for that + On Intel's enhanced IBRS systems, this includes cross-thread branch target + injections on SMT systems (STIBP). In other words, Intel eIBRS enables + STIBP, too. + + AMD Automatic IBRS does not protect userspace, and Legacy IBRS systems clear + the IBRS bit on exit to userspace, therefore both explicitly enable STIBP.

The retpoline mitigation is turned on by default on vulnerable CPUs. It can be forced on or off by the administrator diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c index 9e2a91830f72..95507448e781 100644 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -1150,19 +1150,21 @@ spectre_v2_user_select_mitigation(void) }

/* - * If no STIBP, enhanced IBRS is enabled, or SMT impossible, STIBP + * If no STIBP, Intel enhanced IBRS is enabled, or SMT impossible, STIBP * is not required. * - * Enhanced IBRS also protects against cross-thread branch target + * Intel's Enhanced IBRS also protects against cross-thread branch target * injection in user-mode as the IBRS bit remains always set which * implicitly enables cross-thread protections. However, in legacy IBRS * mode, the IBRS bit is set only on kernel entry and cleared on return - * to userspace. This disables the implicit cross-thread protection, - * so allow for STIBP to be selected in that case. + * to userspace. AMD Automatic IBRS also does not protect userspace. + * These modes therefore disable the implicit cross-thread protection, + * so allow for STIBP to be selected in those cases. */ if (!boot_cpu_has(X86_FEATURE_STIBP) || !smt_possible || - spectre_v2_in_eibrs_mode(spectre_v2_enabled)) + (spectre_v2_in_eibrs_mode(spectre_v2_enabled) && + !boot_cpu_has(X86_FEATURE_AUTOIBRS))) return;

/* @@ -2294,7 +2296,8 @@ static ssize_t mmio_stale_data_show_state(char *buf)

static char *stibp_state(void) { - if (spectre_v2_in_eibrs_mode(spectre_v2_enabled)) + if (spectre_v2_in_eibrs_mode(spectre_v2_enabled) && + !boot_cpu_has(X86_FEATURE_AUTOIBRS)) return "";

switch (spectre_v2_user_stibp) {