From patchwork Sun Oct 23 19:13:41 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: 13016730 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 DE6DCC3A59D for ; Mon, 24 Oct 2022 06:32:44 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1omnI5-0004nD-GA; Sun, 23 Oct 2022 22:34:13 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1omgQ5-00087l-2M for qemu-devel@nongnu.org; Sun, 23 Oct 2022 15:14:01 -0400 Received: from ams.source.kernel.org ([2604:1380:4601:e00::1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1omgQ2-0001qZ-PA for qemu-devel@nongnu.org; Sun, 23 Oct 2022 15:14:00 -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 ams.source.kernel.org (Postfix) with ESMTPS id BC04FB80BED; Sun, 23 Oct 2022 19:13:56 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C9CC2C433D6; Sun, 23 Oct 2022 19:13:54 +0000 (UTC) Authentication-Results: smtp.kernel.org; dkim=pass (1024-bit key) header.d=zx2c4.com header.i=@zx2c4.com header.b="fPfBV1TY" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zx2c4.com; s=20210105; t=1666552433; 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; bh=J4/QDtb3UAFmP47djUn5l+9R0wUe33djMFE8q6hSzAA=; b=fPfBV1TYDRnPWQuwxwNkwzZ6EB4Mi+8UbHuFTGKFkwmeAmrWDXfsXMNX4zCuore04w2W6i qErU/QQGXXgN23M0X6oXJcjwZWqUj4iE2Ywx9/au3Inahb/NGOGhfmCTmUNQJ4A8d1aXvR X6jU9BJ5ZGhrdbEoPlwe/82W+AjwQaM= Received: by mail.zx2c4.com (ZX2C4 Mail Server) with ESMTPSA id b5bfd599 (TLSv1.3:TLS_AES_256_GCM_SHA384:256:NO); Sun, 23 Oct 2022 19:13:52 +0000 (UTC) From: "Jason A. Donenfeld" To: laurent@vivier.eu, qemu-devel@nongnu.org Cc: "Jason A. Donenfeld" , Geert Uytterhoeven Subject: [PATCH v5] m68k: write bootinfo as rom section and re-randomize on reboot Date: Sun, 23 Oct 2022 21:13:41 +0200 Message-Id: <20221023191340.36238-1-Jason@zx2c4.com> MIME-Version: 1.0 Received-SPF: pass client-ip=2604:1380:4601:e00::1; envelope-from=SRS0=Qviv=2Y=zx2c4.com=Jason@kernel.org; helo=ams.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=0.249, 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: , Sender: "Qemu-devel" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org 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 --- Changes v4->v5: - Use QEMU_ALIGN_PTR_UP. I'm also okay with v4, if you prefer that instead. I did this just because Richard mentioned it. But I don't really care, and most other QEMU code doesn't bother either. 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..a3d37e3c80 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 = QEMU_ALIGN_PTR_UP(base, 4); \ } 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 = QEMU_ALIGN_PTR_UP(base, 4); \ } 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); } }