From nobody Sun Feb 8 07:08:32 2026 Received: from mail-ej1-f74.google.com (mail-ej1-f74.google.com [209.85.218.74]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7CF13387B11 for ; Wed, 17 Dec 2025 13:59:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.218.74 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765979979; cv=none; b=k2DXFMob2aZb98QoZ0zSEXFTnx5jviaCsk1L+sdfjIH6zbiBymbfHd6dfB2e5kAodMXynSY+jVqvyY/PJ0Rg3ZQWzN+AyH5/khrWSPcwqoldbp5ciZSFTft4KcG/KT51cc/i9UYOayeIa36Jiq9RTRuo3reGgF83j45N8BxRXUU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765979979; c=relaxed/simple; bh=b283TkR/J42estS6ho7KZ9ZW+aNvaWfv0egTJl8++tg=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=Zi4EirBHx+qYRNXlOndKBSZLhKXrMq//CXoz2SGSep87H0yYSQfF3m0q07rlr2NPZ5diRLBFn244YeEBVqAJIXUX/jqELTFd+/iv3viilfFUatSSS/9YlpC9e6e7hLw7Gb7u9/Og67PhKKCWE3ywIRpAj8DNL4FHHTu6UuBzIlk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--srosek.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=2vbekPk2; arc=none smtp.client-ip=209.85.218.74 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--srosek.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="2vbekPk2" Received: by mail-ej1-f74.google.com with SMTP id a640c23a62f3a-b800ee1a176so84734066b.1 for ; Wed, 17 Dec 2025 05:59:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1765979976; x=1766584776; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=L+LsWBBeNUqmreZyuEYPO1kEYcqrZnApoVy0IOBA0P0=; b=2vbekPk2BosWtOJNIqjLS37QKcsjuFXqUJwKeRxYzvSmqRf0NwYExgBIUMFWxHxhpS MuCCU0xvoKRDD+y097kX9tf+COG5kX40MKiPe79EU8SQhoCjS1dzjDi5lSrr5pOLMoKI gD8n5ifvkrs/hULSnXGHfkWSBXgfwngf7kTZzXAWSva9ygnoSKGk2xgEaiw9xr/cQuBa zLm8401DJQ5Bj6uqFSyZRVveFMLUMCTZJIUYZfKM5q1I5D+C8CWu7Mr+p2PpHSMMb0OT mUYtEPBPeeJ0rj70fBydVYXnWZVGNMuMreYDHi5lRaQV3YRUjkb9o1wc1jLhHG/tmCNf z+CQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1765979976; x=1766584776; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=L+LsWBBeNUqmreZyuEYPO1kEYcqrZnApoVy0IOBA0P0=; b=v2IA2MIhSfwFaKZr3QpVu9t9jfWAQDRayxz9xphaFDnAvnKDwse9AZypjoxaa8ggZx EgZtYE5gjaKKrHszPQU83tFp+aPcbQHsGDe0i9sktqwVqSYlAuboEtT9va8mjbX/+Q7H 0nRfcJhCwpKZkWyhfBLGDUGG7eCHMwp7MvUsvNj1Z7p4c5nngYCgHg+pD5vm/LrcSN+u C3vhEiBs+BkNn+1blrJGljAVTZZEOn3n0aX7OAtauqQrUFDpDq3ZCLVk0zNE2odUpJdZ Br020LcgXFuZzp5jYhcXsJ9D3bmnKM0HMAhrizcxXw5NCut1YWflDin/c4lNfx/f3C6j o2xg== X-Forwarded-Encrypted: i=1; AJvYcCVrlWh3PbzUR3NSmFDicAMKKrYmM70XW36P+5N6a1RHG7tx9rX/svO51BpiJns4l38XzFGbMZzBV4AQroY=@vger.kernel.org X-Gm-Message-State: AOJu0Yz82ncR8eCIHfvA8m4bmuelElsEkNCzRPYnLVO6nfXbd0gpbQWS 90YMLMuN0H3W/dWB/xLO00q6xQB6lZBe90NX4LO8kKdVaWfOHy7YmVjIPAZEpoQ0nnIwnp0TFhq TkEfGVA== X-Google-Smtp-Source: AGHT+IGKBO6JKE4toaVcqBpAVaGVwBpONJILCsccvce/1Uqiqm/5D3qAdkQRLYMqmO/mif3P7qmCQWnTcZ4= X-Received: from ejbdx22.prod.google.com ([2002:a17:906:a856:b0:b7a:6f04:dfab]) (user=srosek job=prod-delivery.src-stubby-dispatcher) by 2002:a17:906:4fc8:b0:b79:f8f7:38ea with SMTP id a640c23a62f3a-b7d23c5bccfmr1848250466b.45.1765979975773; Wed, 17 Dec 2025 05:59:35 -0800 (PST) Date: Wed, 17 Dec 2025 13:59:31 +0000 In-Reply-To: <20251217135932.3153847-1-srosek@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20251217135932.3153847-1-srosek@google.com> X-Mailer: git-send-email 2.52.0.305.g3fc767764a-goog Message-ID: <20251217135932.3153847-2-srosek@google.com> Subject: [PATCH v1 1/2] selftests/x86/ldt_gdt: Skip int80 if not supported From: Slawomir Rosek To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H . Peter Anvin" , Shuah Khan Cc: Betty Zhou , Wake Liu , Kazuhiro Inaba , Jeff Xu , Alistair Delva , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Slawomir Rosek Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The IA32 Emulation support can be either removed from the kernel, disabled by default or disabled at runtime. The x86/ldt_gdt selftest crashes for all of above thus is_32bit_syscall_supported() helper is added to skip int80 syscalls if they are not supported. Signed-off-by: Slawomir Rosek --- tools/testing/selftests/x86/ldt_gdt.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/x86/ldt_gdt.c b/tools/testing/selftest= s/x86/ldt_gdt.c index bb99a71380a5..b178392e50c0 100644 --- a/tools/testing/selftests/x86/ldt_gdt.c +++ b/tools/testing/selftests/x86/ldt_gdt.c @@ -62,6 +62,18 @@ static struct user_desc *low_user_desc; static struct user_desc *low_user_desc_clear; /* Use to delete GDT entry = */ static int gdt_entry_num; =20 +static bool is_32bit_syscall_supported(void) +{ +#ifdef __x86_64__ + return system("((zcat /proc/config.gz | grep CONFIG_IA32_EMULATION=3Dy) &= &" + "((test -z $(zcat /proc/config.gz | grep CONFIG_IA32_EMULATION_DEFAULT_D= ISABLED=3Dy)) || (grep ia32_emulation=3Dtrue /proc/cmdline)) &&" + "(test -z $(grep ia32_emulation=3Dfalse /proc/cmdline))) >/dev/null 2>&1" + ) =3D=3D 0; +#else + return true; +#endif +} + static void check_invalid_segment(uint16_t index, int ldt) { uint32_t has_limit =3D 0, has_ar =3D 0, limit, ar; @@ -147,6 +159,7 @@ static bool install_valid_mode(const struct user_desc *= d, uint32_t ar, if (!ldt) { #ifndef __i386__ /* No point testing set_thread_area in a 64-bit build */ + printf("[SKIP]\tNo point testing set_thread_area in a 64-bit build\n"); return false; #endif if (!gdt_entry_num) @@ -676,6 +689,10 @@ static void setup_counter_page(void) static int invoke_set_thread_area(void) { int ret; + if (!is_32bit_syscall_supported()) { + printf("[SKIP]\tNo 32bit syscall support in a 64-bit build\n"); + return -1; + } asm volatile ("int $0x80" : "=3Da" (ret), "+m" (low_user_desc) : "a" (243), "b" (low_user_desc) @@ -716,8 +733,10 @@ static void setup_low_user_desc(void) =20 static void test_gdt_invalidation(void) { - if (!gdt_entry_num) + if (!gdt_entry_num) { + printf("[SKIP]\tNo set_thread_area support in a 64-bit only system\n"); return; /* 64-bit only system -- we can't use set_thread_area */ + } =20 unsigned short prev_sel; unsigned short sel; --=20 2.52.0.305.g3fc767764a-goog From nobody Sun Feb 8 07:08:32 2026 Received: from mail-ej1-f73.google.com (mail-ej1-f73.google.com [209.85.218.73]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 39B26387B16 for ; 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Wed, 17 Dec 2025 05:59:36 -0800 (PST) Date: Wed, 17 Dec 2025 13:59:32 +0000 In-Reply-To: <20251217135932.3153847-1-srosek@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20251217135932.3153847-1-srosek@google.com> X-Mailer: git-send-email 2.52.0.305.g3fc767764a-goog Message-ID: <20251217135932.3153847-3-srosek@google.com> Subject: [PATCH v1 2/2] selftests/x86/ptrace_syscall: Skip int80 if not supported From: Slawomir Rosek To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H . Peter Anvin" , Shuah Khan Cc: Betty Zhou , Wake Liu , Kazuhiro Inaba , Jeff Xu , Alistair Delva , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Slawomir Rosek Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The IA32 Emulation support can be either removed from the kernel, disabled by default or disabled at runtime. The x86/ptrace_syscall selftest crashes for all of above thus is_32bit_syscall_supported() helper is added to skip int80 syscalls if they are not supported. Signed-off-by: Slawomir Rosek --- tools/testing/selftests/x86/ptrace_syscall.c | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/x86/ptrace_syscall.c b/tools/testing/s= elftests/x86/ptrace_syscall.c index 360ec88d5432..6c19bea485c6 100644 --- a/tools/testing/selftests/x86/ptrace_syscall.c +++ b/tools/testing/selftests/x86/ptrace_syscall.c @@ -51,6 +51,18 @@ extern void sys32_helper(struct syscall_args32 *, void *= ); extern void int80_and_ret(void); #endif =20 +static bool is_32bit_syscall_supported(void) +{ +#ifdef __x86_64__ + return system("((zcat /proc/config.gz | grep CONFIG_IA32_EMULATION=3Dy) &= &" + "((test -z $(zcat /proc/config.gz | grep CONFIG_IA32_EMULATION_DEFAULT_D= ISABLED=3Dy)) || (grep ia32_emulation=3Dtrue /proc/cmdline)) &&" + "(test -z $(grep ia32_emulation=3Dfalse /proc/cmdline))) >/dev/null 2>&1" + ) =3D=3D 0; +#else + return true; +#endif +} + /* * Helper to invoke int80 with controlled regs and capture the final regs. */ @@ -389,8 +401,12 @@ static void test_restart_under_ptrace(void) =20 int main() { - printf("[RUN]\tCheck int80 return regs\n"); - test_sys32_regs(do_full_int80); + if (is_32bit_syscall_supported()) { + printf("[RUN]\tCheck int80 return regs\n"); + test_sys32_regs(do_full_int80); + } else { + printf("[SKIP]\t32bit syscall support is not available\n"); + } =20 #if defined(__i386__) && (!defined(__GLIBC__) || __GLIBC__ > 2 || __GLIBC_= MINOR__ >=3D 16) vsyscall32 =3D (void *)getauxval(AT_SYSINFO); --=20 2.52.0.305.g3fc767764a-goog