From patchwork Mon Oct 17 20:29:52 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Jason A. Donenfeld" X-Patchwork-Id: 13009576 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 8313DC4332F for ; Mon, 17 Oct 2022 20:33:06 +0000 (UTC) Received: from localhost ([::1]:49650 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1okWnJ-0005ZL-CJ for qemu-devel@archiver.kernel.org; Mon, 17 Oct 2022 16:33:05 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:43558) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1okWkN-0004gL-Te for qemu-devel@nongnu.org; Mon, 17 Oct 2022 16:30:04 -0400 Received: from dfw.source.kernel.org ([139.178.84.217]:48444) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1okWkK-0004Ut-JA for qemu-devel@nongnu.org; Mon, 17 Oct 2022 16:30:03 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 115376125E; Mon, 17 Oct 2022 20:29:59 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 01631C433D7; Mon, 17 Oct 2022 20:29:57 +0000 (UTC) Authentication-Results: smtp.kernel.org; dkim=pass (1024-bit key) header.d=zx2c4.com header.i=@zx2c4.com header.b="PCEH4mRG" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zx2c4.com; s=20210105; t=1666038595; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=IlvWmeYOGI3myCSfqAfKAdYcUq1qzko+44/Rk5CEa9g=; b=PCEH4mRG52Kv8+NaYE6Ia0Xih5qjVPVOT4P1Fu41GYCG0TNCFO7yIVOwX7TibJnRtLJSps XxXwT5tiv0elsTsHiFNvvMAGiQJgjQ30hOhBUInt+X7tsYSweBZIZguJce5bTWPcCVnKLT m7TaWgbpDm73coz2dkyt2lCR7kzv/UY= Received: by mail.zx2c4.com (ZX2C4 Mail Server) with ESMTPSA id 13290bf7 (TLSv1.3:TLS_AES_256_GCM_SHA384:256:NO); Mon, 17 Oct 2022 20:29:55 +0000 (UTC) From: "Jason A. Donenfeld" To: laurent@vivier.eu, qemu-devel@nongnu.org Cc: "Jason A. Donenfeld" , Geert Uytterhoeven Subject: [PATCH v4] m68k: write bootinfo as rom section and re-randomize on reboot Date: Mon, 17 Oct 2022 14:29:52 -0600 Message-Id: <20221017202952.60762-1-Jason@zx2c4.com> In-Reply-To: References: MIME-Version: 1.0 Received-SPF: pass client-ip=139.178.84.217; envelope-from=SRS0=kNOZ=2S=zx2c4.com=Jason@kernel.org; helo=dfw.source.kernel.org X-Spam_score_int: -67 X-Spam_score: -6.8 X-Spam_bar: ------ X-Spam_report: (-6.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HEADER_FROM_DIFFERENT_DOMAINS=0.25, RCVD_IN_DNSWL_HI=-5, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Rather than poking directly into RAM, add the bootinfo block as a proper ROM, so that it's restored when rebooting the system. This way, if the guest corrupts any of the bootinfo items, but then tries to reboot, it'll still be restored back to normal as expected. Then, since the RNG seed needs to be fresh on each boot, regenerate the RNG seed in the ROM when reseting the CPU. Cc: Geert Uytterhoeven Cc: Laurent Vivier Signed-off-by: Jason A. Donenfeld Reviewed-by: Laurent Vivier --- hw/m68k/bootinfo.h | 48 +++++++++++++++---------------- hw/m68k/q800.c | 71 +++++++++++++++++++++++++++++++++------------- hw/m68k/virt.c | 51 +++++++++++++++++++++++---------- 3 files changed, 111 insertions(+), 59 deletions(-) diff --git a/hw/m68k/bootinfo.h b/hw/m68k/bootinfo.h index 897162b818..67e6b66b7d 100644 --- a/hw/m68k/bootinfo.h +++ b/hw/m68k/bootinfo.h @@ -12,66 +12,66 @@ #ifndef HW_M68K_BOOTINFO_H #define HW_M68K_BOOTINFO_H -#define BOOTINFO0(as, base, id) \ +#define BOOTINFO0(base, id) \ do { \ - stw_phys(as, base, id); \ + stw_p(base, id); \ base += 2; \ - stw_phys(as, base, sizeof(struct bi_record)); \ + stw_p(base, sizeof(struct bi_record)); \ base += 2; \ } while (0) -#define BOOTINFO1(as, base, id, value) \ +#define BOOTINFO1(base, id, value) \ do { \ - stw_phys(as, base, id); \ + stw_p(base, id); \ base += 2; \ - stw_phys(as, base, sizeof(struct bi_record) + 4); \ + stw_p(base, sizeof(struct bi_record) + 4); \ base += 2; \ - stl_phys(as, base, value); \ + stl_p(base, value); \ base += 4; \ } while (0) -#define BOOTINFO2(as, base, id, value1, value2) \ +#define BOOTINFO2(base, id, value1, value2) \ do { \ - stw_phys(as, base, id); \ + stw_p(base, id); \ base += 2; \ - stw_phys(as, base, sizeof(struct bi_record) + 8); \ + stw_p(base, sizeof(struct bi_record) + 8); \ base += 2; \ - stl_phys(as, base, value1); \ + stl_p(base, value1); \ base += 4; \ - stl_phys(as, base, value2); \ + stl_p(base, value2); \ base += 4; \ } while (0) -#define BOOTINFOSTR(as, base, id, string) \ +#define BOOTINFOSTR(base, id, string) \ do { \ int i; \ - stw_phys(as, base, id); \ + stw_p(base, id); \ base += 2; \ - stw_phys(as, base, \ + stw_p(base, \ (sizeof(struct bi_record) + strlen(string) + \ 1 /* null termination */ + 3 /* padding */) & ~3); \ base += 2; \ for (i = 0; string[i]; i++) { \ - stb_phys(as, base++, string[i]); \ + stb_p(base++, string[i]); \ } \ - stb_phys(as, base++, 0); \ - base = (base + 3) & ~3; \ + stb_p(base++, 0); \ + base = (void *)(((uintptr_t)base + 3) & ~3); \ } while (0) -#define BOOTINFODATA(as, base, id, data, len) \ +#define BOOTINFODATA(base, id, data, len) \ do { \ int i; \ - stw_phys(as, base, id); \ + stw_p(base, id); \ base += 2; \ - stw_phys(as, base, \ + stw_p(base, \ (sizeof(struct bi_record) + len + \ 2 /* length field */ + 3 /* padding */) & ~3); \ base += 2; \ - stw_phys(as, base, len); \ + stw_p(base, len); \ base += 2; \ for (i = 0; i < len; ++i) { \ - stb_phys(as, base++, data[i]); \ + stb_p(base++, data[i]); \ } \ - base = (base + 3) & ~3; \ + base = (void *)(((uintptr_t)base + 3) & ~3); \ } while (0) #endif diff --git a/hw/m68k/q800.c b/hw/m68k/q800.c index a4590c2cb0..e09e244ddc 100644 --- a/hw/m68k/q800.c +++ b/hw/m68k/q800.c @@ -321,11 +321,22 @@ static const TypeInfo glue_info = { }, }; +typedef struct { + M68kCPU *cpu; + struct bi_record *rng_seed; +} ResetInfo; + static void main_cpu_reset(void *opaque) { - M68kCPU *cpu = opaque; + ResetInfo *reset_info = opaque; + M68kCPU *cpu = reset_info->cpu; CPUState *cs = CPU(cpu); + if (reset_info->rng_seed) { + qemu_guest_getrandom_nofail((void *)reset_info->rng_seed->data + 2, + be16_to_cpu(*(uint16_t *)reset_info->rng_seed->data)); + } + cpu_reset(cs); cpu->env.aregs[7] = ldl_phys(cs->as, 0); cpu->env.pc = ldl_phys(cs->as, 4); @@ -386,6 +397,7 @@ static void q800_init(MachineState *machine) NubusBus *nubus; DeviceState *glue; DriveInfo *dinfo; + ResetInfo *reset_info; uint8_t rng_seed[32]; linux_boot = (kernel_filename != NULL); @@ -396,9 +408,12 @@ static void q800_init(MachineState *machine) exit(1); } + reset_info = g_new0(ResetInfo, 1); + /* init CPUs */ cpu = M68K_CPU(cpu_create(machine->cpu_type)); - qemu_register_reset(main_cpu_reset, cpu); + reset_info->cpu = cpu; + qemu_register_reset(main_cpu_reset, reset_info); /* RAM */ memory_region_add_subregion(get_system_memory(), 0, machine->ram); @@ -598,6 +613,14 @@ static void q800_init(MachineState *machine) cs = CPU(cpu); if (linux_boot) { uint64_t high; + void *param_blob, *param_ptr, *param_rng_seed; + + if (kernel_cmdline) { + param_blob = g_malloc(strlen(kernel_cmdline) + 1024); + } else { + param_blob = g_malloc(1024); + } + kernel_size = load_elf(kernel_filename, NULL, NULL, NULL, &elf_entry, NULL, &high, NULL, 1, EM_68K, 0, 0); @@ -607,23 +630,24 @@ static void q800_init(MachineState *machine) } stl_phys(cs->as, 4, elf_entry); /* reset initial PC */ parameters_base = (high + 1) & ~1; - - BOOTINFO1(cs->as, parameters_base, BI_MACHTYPE, MACH_MAC); - BOOTINFO1(cs->as, parameters_base, BI_FPUTYPE, FPU_68040); - BOOTINFO1(cs->as, parameters_base, BI_MMUTYPE, MMU_68040); - BOOTINFO1(cs->as, parameters_base, BI_CPUTYPE, CPU_68040); - BOOTINFO1(cs->as, parameters_base, BI_MAC_CPUID, CPUB_68040); - BOOTINFO1(cs->as, parameters_base, BI_MAC_MODEL, MAC_MODEL_Q800); - BOOTINFO1(cs->as, parameters_base, + param_ptr = param_blob; + + BOOTINFO1(param_ptr, BI_MACHTYPE, MACH_MAC); + BOOTINFO1(param_ptr, BI_FPUTYPE, FPU_68040); + BOOTINFO1(param_ptr, BI_MMUTYPE, MMU_68040); + BOOTINFO1(param_ptr, BI_CPUTYPE, CPU_68040); + BOOTINFO1(param_ptr, BI_MAC_CPUID, CPUB_68040); + BOOTINFO1(param_ptr, BI_MAC_MODEL, MAC_MODEL_Q800); + BOOTINFO1(param_ptr, BI_MAC_MEMSIZE, ram_size >> 20); /* in MB */ - BOOTINFO2(cs->as, parameters_base, BI_MEMCHUNK, 0, ram_size); - BOOTINFO1(cs->as, parameters_base, BI_MAC_VADDR, + BOOTINFO2(param_ptr, BI_MEMCHUNK, 0, ram_size); + BOOTINFO1(param_ptr, BI_MAC_VADDR, VIDEO_BASE + macfb_mode->offset); - BOOTINFO1(cs->as, parameters_base, BI_MAC_VDEPTH, graphic_depth); - BOOTINFO1(cs->as, parameters_base, BI_MAC_VDIM, + BOOTINFO1(param_ptr, BI_MAC_VDEPTH, graphic_depth); + BOOTINFO1(param_ptr, BI_MAC_VDIM, (graphic_height << 16) | graphic_width); - BOOTINFO1(cs->as, parameters_base, BI_MAC_VROW, macfb_mode->stride); - BOOTINFO1(cs->as, parameters_base, BI_MAC_SCCBASE, SCC_BASE); + BOOTINFO1(param_ptr, BI_MAC_VROW, macfb_mode->stride); + BOOTINFO1(param_ptr, BI_MAC_SCCBASE, SCC_BASE); rom = g_malloc(sizeof(*rom)); memory_region_init_ram_ptr(rom, NULL, "m68k_fake_mac.rom", @@ -632,13 +656,14 @@ static void q800_init(MachineState *machine) memory_region_add_subregion(get_system_memory(), MACROM_ADDR, rom); if (kernel_cmdline) { - BOOTINFOSTR(cs->as, parameters_base, BI_COMMAND_LINE, + BOOTINFOSTR(param_ptr, BI_COMMAND_LINE, kernel_cmdline); } /* Pass seed to RNG. */ + param_rng_seed = param_ptr; qemu_guest_getrandom_nofail(rng_seed, sizeof(rng_seed)); - BOOTINFODATA(cs->as, parameters_base, BI_RNG_SEED, + BOOTINFODATA(param_ptr, BI_RNG_SEED, rng_seed, sizeof(rng_seed)); /* load initrd */ @@ -653,13 +678,19 @@ static void q800_init(MachineState *machine) initrd_base = (ram_size - initrd_size) & TARGET_PAGE_MASK; load_image_targphys(initrd_filename, initrd_base, ram_size - initrd_base); - BOOTINFO2(cs->as, parameters_base, BI_RAMDISK, initrd_base, + BOOTINFO2(param_ptr, BI_RAMDISK, initrd_base, initrd_size); } else { initrd_base = 0; initrd_size = 0; } - BOOTINFO0(cs->as, parameters_base, BI_LAST); + BOOTINFO0(param_ptr, BI_LAST); + rom_add_blob_fixed_as("bootinfo", param_blob, param_ptr - param_blob, + parameters_base, cs->as); + reset_info->rng_seed = rom_ptr_for_as(cs->as, parameters_base, + param_ptr - param_blob) + + (param_rng_seed - param_blob); + g_free(param_blob); } else { uint8_t *ptr; /* allocate and load BIOS */ diff --git a/hw/m68k/virt.c b/hw/m68k/virt.c index f7b903ea1b..89c4108eb5 100644 --- a/hw/m68k/virt.c +++ b/hw/m68k/virt.c @@ -89,6 +89,7 @@ typedef struct { M68kCPU *cpu; hwaddr initial_pc; hwaddr initial_stack; + struct bi_record *rng_seed; } ResetInfo; static void main_cpu_reset(void *opaque) @@ -97,6 +98,11 @@ static void main_cpu_reset(void *opaque) M68kCPU *cpu = reset_info->cpu; CPUState *cs = CPU(cpu); + if (reset_info->rng_seed) { + qemu_guest_getrandom_nofail((void *)reset_info->rng_seed->data + 2, + be16_to_cpu(*(uint16_t *)reset_info->rng_seed->data)); + } + cpu_reset(cs); cpu->env.aregs[7] = reset_info->initial_stack; cpu->env.pc = reset_info->initial_pc; @@ -212,6 +218,13 @@ static void virt_init(MachineState *machine) if (kernel_filename) { CPUState *cs = CPU(cpu); uint64_t high; + void *param_blob, *param_ptr, *param_rng_seed; + + if (kernel_cmdline) { + param_blob = g_malloc(strlen(kernel_cmdline) + 1024); + } else { + param_blob = g_malloc(1024); + } kernel_size = load_elf(kernel_filename, NULL, NULL, NULL, &elf_entry, NULL, &high, NULL, 1, @@ -222,35 +235,37 @@ static void virt_init(MachineState *machine) } reset_info->initial_pc = elf_entry; parameters_base = (high + 1) & ~1; + param_ptr = param_blob; - BOOTINFO1(cs->as, parameters_base, BI_MACHTYPE, MACH_VIRT); - BOOTINFO1(cs->as, parameters_base, BI_FPUTYPE, FPU_68040); - BOOTINFO1(cs->as, parameters_base, BI_MMUTYPE, MMU_68040); - BOOTINFO1(cs->as, parameters_base, BI_CPUTYPE, CPU_68040); - BOOTINFO2(cs->as, parameters_base, BI_MEMCHUNK, 0, ram_size); + BOOTINFO1(param_ptr, BI_MACHTYPE, MACH_VIRT); + BOOTINFO1(param_ptr, BI_FPUTYPE, FPU_68040); + BOOTINFO1(param_ptr, BI_MMUTYPE, MMU_68040); + BOOTINFO1(param_ptr, BI_CPUTYPE, CPU_68040); + BOOTINFO2(param_ptr, BI_MEMCHUNK, 0, ram_size); - BOOTINFO1(cs->as, parameters_base, BI_VIRT_QEMU_VERSION, + BOOTINFO1(param_ptr, BI_VIRT_QEMU_VERSION, ((QEMU_VERSION_MAJOR << 24) | (QEMU_VERSION_MINOR << 16) | (QEMU_VERSION_MICRO << 8))); - BOOTINFO2(cs->as, parameters_base, BI_VIRT_GF_PIC_BASE, + BOOTINFO2(param_ptr, BI_VIRT_GF_PIC_BASE, VIRT_GF_PIC_MMIO_BASE, VIRT_GF_PIC_IRQ_BASE); - BOOTINFO2(cs->as, parameters_base, BI_VIRT_GF_RTC_BASE, + BOOTINFO2(param_ptr, BI_VIRT_GF_RTC_BASE, VIRT_GF_RTC_MMIO_BASE, VIRT_GF_RTC_IRQ_BASE); - BOOTINFO2(cs->as, parameters_base, BI_VIRT_GF_TTY_BASE, + BOOTINFO2(param_ptr, BI_VIRT_GF_TTY_BASE, VIRT_GF_TTY_MMIO_BASE, VIRT_GF_TTY_IRQ_BASE); - BOOTINFO2(cs->as, parameters_base, BI_VIRT_CTRL_BASE, + BOOTINFO2(param_ptr, BI_VIRT_CTRL_BASE, VIRT_CTRL_MMIO_BASE, VIRT_CTRL_IRQ_BASE); - BOOTINFO2(cs->as, parameters_base, BI_VIRT_VIRTIO_BASE, + BOOTINFO2(param_ptr, BI_VIRT_VIRTIO_BASE, VIRT_VIRTIO_MMIO_BASE, VIRT_VIRTIO_IRQ_BASE); if (kernel_cmdline) { - BOOTINFOSTR(cs->as, parameters_base, BI_COMMAND_LINE, + BOOTINFOSTR(param_ptr, BI_COMMAND_LINE, kernel_cmdline); } /* Pass seed to RNG. */ + param_rng_seed = param_ptr; qemu_guest_getrandom_nofail(rng_seed, sizeof(rng_seed)); - BOOTINFODATA(cs->as, parameters_base, BI_RNG_SEED, + BOOTINFODATA(param_ptr, BI_RNG_SEED, rng_seed, sizeof(rng_seed)); /* load initrd */ @@ -265,13 +280,19 @@ static void virt_init(MachineState *machine) initrd_base = (ram_size - initrd_size) & TARGET_PAGE_MASK; load_image_targphys(initrd_filename, initrd_base, ram_size - initrd_base); - BOOTINFO2(cs->as, parameters_base, BI_RAMDISK, initrd_base, + BOOTINFO2(param_ptr, BI_RAMDISK, initrd_base, initrd_size); } else { initrd_base = 0; initrd_size = 0; } - BOOTINFO0(cs->as, parameters_base, BI_LAST); + BOOTINFO0(param_ptr, BI_LAST); + rom_add_blob_fixed_as("bootinfo", param_blob, param_ptr - param_blob, + parameters_base, cs->as); + reset_info->rng_seed = rom_ptr_for_as(cs->as, parameters_base, + param_ptr - param_blob) + + (param_rng_seed - param_blob); + g_free(param_blob); } }