From 198cca2028659addc6cce1a4fe2f14b7b84d1a22 Mon Sep 17 00:00:00 2001 From: Laszlo Ersek Date: Mon, 12 Aug 2013 15:59:37 +0200 Subject: dump: clamp guest-provided mapping lengths to ramblock sizes RH-Author: Laszlo Ersek Message-id: <1376323180-12863-8-git-send-email-lersek@redhat.com> Patchwork-id: 53169 O-Subject: [RHEL-7 qemu-kvm PATCH 07/10] dump: clamp guest-provided mapping lengths to ramblock sizes Bugzilla: 981582 RH-Acked-by: Stefan Hajnoczi RH-Acked-by: Radim Krcmar RH-Acked-by: Miroslav Rezanina Even a trusted & clean-state guest can map more memory than what it was given. Since the vmcore contains RAMBlocks, mapping sizes should be clamped to RAMBlock sizes. Otherwise such oversized mappings can exceed the entire file size, and ELF parsers might refuse even the valid portion of the PT_LOAD entry. Related RHBZ: https://bugzilla.redhat.com/show_bug.cgi?id=981582 Signed-off-by: Laszlo Ersek Signed-off-by: Luiz Capitulino (cherry picked from commit 2cac260768b9d4253737417ea7501cf2950e257f) diff --git a/dump.c b/dump.c index 44a1339..cbfad1c 100644 --- a/dump.c +++ b/dump.c @@ -187,7 +187,8 @@ static int write_elf32_header(DumpState *s) } static int write_elf64_load(DumpState *s, MemoryMapping *memory_mapping, - int phdr_index, hwaddr offset) + int phdr_index, hwaddr offset, + hwaddr filesz) { Elf64_Phdr phdr; int ret; @@ -197,15 +198,12 @@ static int write_elf64_load(DumpState *s, MemoryMapping *memory_mapping, phdr.p_type = cpu_convert_to_target32(PT_LOAD, endian); phdr.p_offset = cpu_convert_to_target64(offset, endian); phdr.p_paddr = cpu_convert_to_target64(memory_mapping->phys_addr, endian); - if (offset == -1) { - /* When the memory is not stored into vmcore, offset will be -1 */ - phdr.p_filesz = 0; - } else { - phdr.p_filesz = cpu_convert_to_target64(memory_mapping->length, endian); - } + phdr.p_filesz = cpu_convert_to_target64(filesz, endian); phdr.p_memsz = cpu_convert_to_target64(memory_mapping->length, endian); phdr.p_vaddr = cpu_convert_to_target64(memory_mapping->virt_addr, endian); + assert(memory_mapping->length >= filesz); + ret = fd_write_vmcore(&phdr, sizeof(Elf64_Phdr), s); if (ret < 0) { dump_error(s, "dump: failed to write program header table.\n"); @@ -216,7 +214,8 @@ static int write_elf64_load(DumpState *s, MemoryMapping *memory_mapping, } static int write_elf32_load(DumpState *s, MemoryMapping *memory_mapping, - int phdr_index, hwaddr offset) + int phdr_index, hwaddr offset, + hwaddr filesz) { Elf32_Phdr phdr; int ret; @@ -226,15 +225,12 @@ static int write_elf32_load(DumpState *s, MemoryMapping *memory_mapping, phdr.p_type = cpu_convert_to_target32(PT_LOAD, endian); phdr.p_offset = cpu_convert_to_target32(offset, endian); phdr.p_paddr = cpu_convert_to_target32(memory_mapping->phys_addr, endian); - if (offset == -1) { - /* When the memory is not stored into vmcore, offset will be -1 */ - phdr.p_filesz = 0; - } else { - phdr.p_filesz = cpu_convert_to_target32(memory_mapping->length, endian); - } + phdr.p_filesz = cpu_convert_to_target32(filesz, endian); phdr.p_memsz = cpu_convert_to_target32(memory_mapping->length, endian); phdr.p_vaddr = cpu_convert_to_target32(memory_mapping->virt_addr, endian); + assert(memory_mapping->length >= filesz); + ret = fd_write_vmcore(&phdr, sizeof(Elf32_Phdr), s); if (ret < 0) { dump_error(s, "dump: failed to write program header table.\n"); @@ -422,17 +418,24 @@ static int write_memory(DumpState *s, RAMBlock *block, ram_addr_t start, return 0; } -/* get the memory's offset in the vmcore */ -static hwaddr get_offset(hwaddr phys_addr, - DumpState *s) +/* get the memory's offset and size in the vmcore */ +static void get_offset_range(hwaddr phys_addr, + ram_addr_t mapping_length, + DumpState *s, + hwaddr *p_offset, + hwaddr *p_filesz) { RAMBlock *block; hwaddr offset = s->memory_offset; int64_t size_in_block, start; + /* When the memory is not stored into vmcore, offset will be -1 */ + *p_offset = -1; + *p_filesz = 0; + if (s->has_filter) { if (phys_addr < s->begin || phys_addr >= s->begin + s->length) { - return -1; + return; } } @@ -461,18 +464,26 @@ static hwaddr get_offset(hwaddr phys_addr, } if (phys_addr >= start && phys_addr < start + size_in_block) { - return phys_addr - start + offset; + *p_offset = phys_addr - start + offset; + + /* The offset range mapped from the vmcore file must not spill over + * the RAMBlock, clamp it. The rest of the mapping will be + * zero-filled in memory at load time; see + * . + */ + *p_filesz = phys_addr + mapping_length <= start + size_in_block ? + mapping_length : + size_in_block - (phys_addr - start); + return; } offset += size_in_block; } - - return -1; } static int write_elf_loads(DumpState *s) { - hwaddr offset; + hwaddr offset, filesz; MemoryMapping *memory_mapping; uint32_t phdr_index = 1; int ret; @@ -485,11 +496,15 @@ static int write_elf_loads(DumpState *s) } QTAILQ_FOREACH(memory_mapping, &s->list.head, next) { - offset = get_offset(memory_mapping->phys_addr, s); + get_offset_range(memory_mapping->phys_addr, + memory_mapping->length, + s, &offset, &filesz); if (s->dump_info.d_class == ELFCLASS64) { - ret = write_elf64_load(s, memory_mapping, phdr_index++, offset); + ret = write_elf64_load(s, memory_mapping, phdr_index++, offset, + filesz); } else { - ret = write_elf32_load(s, memory_mapping, phdr_index++, offset); + ret = write_elf32_load(s, memory_mapping, phdr_index++, offset, + filesz); } if (ret < 0) {