From: Michael Clark <mjc@sifive.com>
To: qemu-devel@nongnu.org
Cc: patches@groups.riscv.org, Michael Clark <mjc@sifive.com>,
Sagar Karandikar <sagark@eecs.berkeley.edu>,
Bastian Koppelmann <kbastian@mail.uni-paderborn.de>,
Palmer Dabbelt <palmer@sifive.com>
Subject: [Qemu-devel] [PATCH v6 08/26] RISC-V: Make sure rom has space for fdt
Date: Sat, 24 Mar 2018 11:13:28 -0700 [thread overview]
Message-ID: <1521915220-65389-3-git-send-email-mjc@sifive.com> (raw)
In-Reply-To: <1521915220-65389-1-git-send-email-mjc@sifive.com>
Remove a potential buffer overflow (not seen in practice).
Perhaps cpu_physical_memory_write already has bound checks.
This change however makes space for the maximum device tree
size and adds an explicit bounds check and error message.
It doesn't trigger, but it may help in the future if the
device-tree size is exceeded. e.g. large bootargs.
Cc: Sagar Karandikar <sagark@eecs.berkeley.edu>
Cc: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
Signed-off-by: Michael Clark <mjc@sifive.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
---
hw/riscv/sifive_u.c | 20 ++++++++++++--------
hw/riscv/spike.c | 16 +++++++++++-----
hw/riscv/virt.c | 13 +++++++++----
3 files changed, 32 insertions(+), 17 deletions(-)
diff --git a/hw/riscv/sifive_u.c b/hw/riscv/sifive_u.c
index 083043a..57b4f4f 100644
--- a/hw/riscv/sifive_u.c
+++ b/hw/riscv/sifive_u.c
@@ -52,7 +52,7 @@ static const struct MemmapEntry {
hwaddr size;
} sifive_u_memmap[] = {
[SIFIVE_U_DEBUG] = { 0x0, 0x100 },
- [SIFIVE_U_MROM] = { 0x1000, 0x2000 },
+ [SIFIVE_U_MROM] = { 0x1000, 0x11000 },
[SIFIVE_U_CLINT] = { 0x2000000, 0x10000 },
[SIFIVE_U_PLIC] = { 0xc000000, 0x4000000 },
[SIFIVE_U_UART0] = { 0x10013000, 0x1000 },
@@ -221,7 +221,7 @@ static void riscv_sifive_u_init(MachineState *machine)
const struct MemmapEntry *memmap = sifive_u_memmap;
SiFiveUState *s = g_new0(SiFiveUState, 1);
- MemoryRegion *sys_memory = get_system_memory();
+ MemoryRegion *system_memory = get_system_memory();
MemoryRegion *main_mem = g_new(MemoryRegion, 1);
MemoryRegion *mask_rom = g_new(MemoryRegion, 1);
@@ -239,7 +239,7 @@ static void riscv_sifive_u_init(MachineState *machine)
/* register RAM */
memory_region_init_ram(main_mem, NULL, "riscv.sifive.u.ram",
machine->ram_size, &error_fatal);
- memory_region_add_subregion(sys_memory, memmap[SIFIVE_U_DRAM].base,
+ memory_region_add_subregion(system_memory, memmap[SIFIVE_U_DRAM].base,
main_mem);
/* create device tree */
@@ -247,9 +247,9 @@ static void riscv_sifive_u_init(MachineState *machine)
/* boot rom */
memory_region_init_ram(mask_rom, NULL, "riscv.sifive.u.mrom",
- memmap[SIFIVE_U_MROM].base, &error_fatal);
- memory_region_set_readonly(mask_rom, true);
- memory_region_add_subregion(sys_memory, 0x0, mask_rom);
+ memmap[SIFIVE_U_MROM].size, &error_fatal);
+ memory_region_add_subregion(system_memory, memmap[SIFIVE_U_MROM].base,
+ mask_rom);
if (machine->kernel_filename) {
load_kernel(machine->kernel_filename);
@@ -276,6 +276,10 @@ static void riscv_sifive_u_init(MachineState *machine)
copy_le32_to_phys(memmap[SIFIVE_U_MROM].base, reset_vec, sizeof(reset_vec));
/* copy in the device tree */
+ if (s->fdt_size >= memmap[SIFIVE_U_MROM].size - sizeof(reset_vec)) {
+ error_report("qemu: not enough space to store device-tree");
+ exit(1);
+ }
qemu_fdt_dumpdtb(s->fdt, s->fdt_size);
cpu_physical_memory_write(memmap[SIFIVE_U_MROM].base +
sizeof(reset_vec), s->fdt, s->fdt_size);
@@ -293,9 +297,9 @@ static void riscv_sifive_u_init(MachineState *machine)
SIFIVE_U_PLIC_CONTEXT_BASE,
SIFIVE_U_PLIC_CONTEXT_STRIDE,
memmap[SIFIVE_U_PLIC].size);
- sifive_uart_create(sys_memory, memmap[SIFIVE_U_UART0].base,
+ sifive_uart_create(system_memory, memmap[SIFIVE_U_UART0].base,
serial_hds[0], SIFIVE_PLIC(s->plic)->irqs[SIFIVE_U_UART0_IRQ]);
- /* sifive_uart_create(sys_memory, memmap[SIFIVE_U_UART1].base,
+ /* sifive_uart_create(system_memory, memmap[SIFIVE_U_UART1].base,
serial_hds[1], SIFIVE_PLIC(s->plic)->irqs[SIFIVE_U_UART1_IRQ]); */
sifive_clint_create(memmap[SIFIVE_U_CLINT].base,
memmap[SIFIVE_U_CLINT].size, smp_cpus,
diff --git a/hw/riscv/spike.c b/hw/riscv/spike.c
index 64e585e..c7d937b 100644
--- a/hw/riscv/spike.c
+++ b/hw/riscv/spike.c
@@ -46,7 +46,7 @@ static const struct MemmapEntry {
hwaddr base;
hwaddr size;
} spike_memmap[] = {
- [SPIKE_MROM] = { 0x1000, 0x2000 },
+ [SPIKE_MROM] = { 0x1000, 0x11000 },
[SPIKE_CLINT] = { 0x2000000, 0x10000 },
[SPIKE_DRAM] = { 0x80000000, 0x0 },
};
@@ -197,8 +197,9 @@ static void spike_v1_10_0_board_init(MachineState *machine)
/* boot rom */
memory_region_init_ram(mask_rom, NULL, "riscv.spike.mrom",
- s->fdt_size + 0x2000, &error_fatal);
- memory_region_add_subregion(system_memory, 0x0, mask_rom);
+ memmap[SPIKE_MROM].size, &error_fatal);
+ memory_region_add_subregion(system_memory, memmap[SPIKE_MROM].base,
+ mask_rom);
if (machine->kernel_filename) {
load_kernel(machine->kernel_filename);
@@ -225,6 +226,10 @@ static void spike_v1_10_0_board_init(MachineState *machine)
copy_le32_to_phys(memmap[SPIKE_MROM].base, reset_vec, sizeof(reset_vec));
/* copy in the device tree */
+ if (s->fdt_size >= memmap[SPIKE_MROM].size - sizeof(reset_vec)) {
+ error_report("qemu: not enough space to store device-tree");
+ exit(1);
+ }
qemu_fdt_dumpdtb(s->fdt, s->fdt_size);
cpu_physical_memory_write(memmap[SPIKE_MROM].base + sizeof(reset_vec),
s->fdt, s->fdt_size);
@@ -266,8 +271,9 @@ static void spike_v1_09_1_board_init(MachineState *machine)
/* boot rom */
memory_region_init_ram(mask_rom, NULL, "riscv.spike.mrom",
- 0x40000, &error_fatal);
- memory_region_add_subregion(system_memory, 0x0, mask_rom);
+ memmap[SPIKE_MROM].size, &error_fatal);
+ memory_region_add_subregion(system_memory, memmap[SPIKE_MROM].base,
+ mask_rom);
if (machine->kernel_filename) {
load_kernel(machine->kernel_filename);
diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c
index 5913100..d680cbd 100644
--- a/hw/riscv/virt.c
+++ b/hw/riscv/virt.c
@@ -45,8 +45,8 @@ static const struct MemmapEntry {
hwaddr size;
} virt_memmap[] = {
[VIRT_DEBUG] = { 0x0, 0x100 },
- [VIRT_MROM] = { 0x1000, 0x2000 },
- [VIRT_TEST] = { 0x4000, 0x1000 },
+ [VIRT_MROM] = { 0x1000, 0x11000 },
+ [VIRT_TEST] = { 0x100000, 0x1000 },
[VIRT_CLINT] = { 0x2000000, 0x10000 },
[VIRT_PLIC] = { 0xc000000, 0x4000000 },
[VIRT_UART0] = { 0x10000000, 0x100 },
@@ -297,8 +297,9 @@ static void riscv_virt_board_init(MachineState *machine)
/* boot rom */
memory_region_init_ram(mask_rom, NULL, "riscv_virt_board.mrom",
- s->fdt_size + 0x2000, &error_fatal);
- memory_region_add_subregion(system_memory, 0x0, mask_rom);
+ memmap[VIRT_MROM].size, &error_fatal);
+ memory_region_add_subregion(system_memory, memmap[VIRT_MROM].base,
+ mask_rom);
if (machine->kernel_filename) {
uint64_t kernel_entry = load_kernel(machine->kernel_filename);
@@ -336,6 +337,10 @@ static void riscv_virt_board_init(MachineState *machine)
copy_le32_to_phys(memmap[VIRT_MROM].base, reset_vec, sizeof(reset_vec));
/* copy in the device tree */
+ if (s->fdt_size >= memmap[VIRT_MROM].size - sizeof(reset_vec)) {
+ error_report("qemu: not enough space to store device-tree");
+ exit(1);
+ }
qemu_fdt_dumpdtb(s->fdt, s->fdt_size);
cpu_physical_memory_write(memmap[VIRT_MROM].base + sizeof(reset_vec),
s->fdt, s->fdt_size);
--
2.7.0
next prev parent reply other threads:[~2018-03-24 18:34 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-24 18:13 [Qemu-devel] [PATCH v6 00/26] RISC-V: Fixes and cleanups for QEMU 2.12 Michael Clark
2018-03-24 18:13 ` [Qemu-devel] [PATCH v6 06/26] RISC-V: Mark ROM read-only after copying in code Michael Clark
2018-03-24 19:45 ` Michael Clark
2018-03-24 20:19 ` Michael Clark
2018-03-24 21:23 ` Peter Maydell
2018-03-25 0:23 ` Michael Clark
2018-03-25 12:47 ` Peter Maydell
2018-03-26 22:22 ` Michael Clark
2018-03-24 18:13 ` Michael Clark [this message]
2018-03-24 21:25 ` [Qemu-devel] [PATCH v6 08/26] RISC-V: Make sure rom has space for fdt Peter Maydell
2018-03-24 22:35 ` Michael Clark
2018-03-24 18:13 ` [Qemu-devel] [PATCH v6 10/26] RISC-V: Improve page table walker spec compliance Michael Clark
2018-03-24 19:39 ` Michael Clark
2018-03-24 18:13 ` [Qemu-devel] [PATCH v6 11/26] RISC-V: Update E order and I extension order Michael Clark
2018-03-24 18:13 ` [Qemu-devel] [PATCH v6 14/26] RISC-V: Use memory_region_is_ram in pte update Michael Clark
2018-03-24 18:13 ` [Qemu-devel] [PATCH v6 16/26] RISC-V: Hardwire satp to 0 for no-mmu case Michael Clark
2018-03-24 18:13 ` [Qemu-devel] [PATCH v6 18/26] RISC-V: riscv-qemu port supports sv39 and sv48 Michael Clark
2018-03-24 18:13 ` [Qemu-devel] [PATCH v6 19/26] RISC-V: vectored traps are optional Michael Clark
2018-03-24 18:13 ` [Qemu-devel] [PATCH v6 20/26] RISC-V: No traps on writes to misa, minstret, mcycle Michael Clark
2018-03-24 18:13 ` [Qemu-devel] [PATCH v6 21/26] RISC-V: Remove support for adhoc X_COP interrupt Michael Clark
2018-03-24 18:13 ` [Qemu-devel] [PATCH v6 23/26] RISC-V: Clear mtval/stval on exceptions without info Michael Clark
2018-03-24 18:13 ` [Qemu-devel] [PATCH v6 24/26] RISC-V: Remove erroneous comment from translate.c Michael Clark
2018-03-24 18:13 ` [Qemu-devel] [PATCH v6 25/26] RISC-V: Fix incorrect disassembly for addiw Michael Clark
2018-03-24 18:13 ` [Qemu-devel] [PATCH v6 26/26] RISC-V: Workaround for critical mstatus.FS MTTCG bug Michael Clark
2018-03-24 19:17 ` Michael Clark
2018-03-24 19:46 ` Richard W.M. Jones
2018-03-25 15:03 ` [Qemu-devel] [PATCH v6 00/26] RISC-V: Fixes and cleanups for QEMU 2.12 Peter Maydell
2018-03-26 18:07 ` [Qemu-devel] [patches] " Michael Clark
2018-03-26 23:14 ` Michael Clark
2018-03-26 23:45 ` Michael Clark
2018-03-27 10:21 ` Daniel P. Berrangé
2018-03-27 9:42 ` Peter Maydell
2018-03-27 18:39 ` Michael Clark
2018-03-27 19:00 ` Michael Clark
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