diff --git a/arch/s390/kernel/crash_dump.c b/arch/s390/kernel/crash_dump.c index 9863ebe75019..edae13416196 100644 --- a/arch/s390/kernel/crash_dump.c +++ b/arch/s390/kernel/crash_dump.c @@ -451,7 +451,7 @@ static void *nt_final(void *ptr) /* * Initialize ELF header (new kernel) */ -static void *ehdr_init(Elf64_Ehdr *ehdr, int mem_chunk_cnt) +static void *ehdr_init(Elf64_Ehdr *ehdr, int phdr_count) { memset(ehdr, 0, sizeof(*ehdr)); memcpy(ehdr->e_ident, ELFMAG, SELFMAG); @@ -465,11 +465,8 @@ static void *ehdr_init(Elf64_Ehdr *ehdr, int mem_chunk_cnt) ehdr->e_phoff = sizeof(Elf64_Ehdr); ehdr->e_ehsize = sizeof(Elf64_Ehdr); ehdr->e_phentsize = sizeof(Elf64_Phdr); - /* - * Number of memory chunk PT_LOAD program headers plus one kernel - * image PT_LOAD program header plus one PT_NOTE program header. - */ - ehdr->e_phnum = mem_chunk_cnt + 1 + 1; + /* Number of PT_LOAD program headers plus PT_NOTE program header */ + ehdr->e_phnum = phdr_count + 1; return ehdr + 1; } @@ -503,12 +500,14 @@ static int get_mem_chunk_cnt(void) /* * Initialize ELF loads (new kernel) */ -static void loads_init(Elf64_Phdr *phdr) +static void loads_init(Elf64_Phdr *phdr, bool os_info_has_vm) { - unsigned long old_identity_base = os_info_old_value(OS_INFO_IDENTITY_BASE); + unsigned long old_identity_base = 0; phys_addr_t start, end; u64 idx; + if (os_info_has_vm) + old_identity_base = os_info_old_value(OS_INFO_IDENTITY_BASE); for_each_physmem_range(idx, &oldmem_type, &start, &end) { phdr->p_type = PT_LOAD; phdr->p_vaddr = old_identity_base + start; @@ -522,6 +521,11 @@ static void loads_init(Elf64_Phdr *phdr) } } +static bool os_info_has_vm(void) +{ + return os_info_old_value(OS_INFO_KASLR_OFFSET); +} + /* * Prepare PT_LOAD type program header for kernel image region */ @@ -566,7 +570,7 @@ static void *notes_init(Elf64_Phdr *phdr, void *ptr, u64 notes_offset) return ptr; } -static size_t get_elfcorehdr_size(int mem_chunk_cnt) +static size_t get_elfcorehdr_size(int phdr_count) { size_t size; @@ -581,10 +585,8 @@ static size_t get_elfcorehdr_size(int mem_chunk_cnt) size += nt_vmcoreinfo_size(); /* nt_final */ size += sizeof(Elf64_Nhdr); - /* PT_LOAD type program header for kernel text region */ - size += sizeof(Elf64_Phdr); /* PT_LOADS */ - size += mem_chunk_cnt * sizeof(Elf64_Phdr); + size += phdr_count * sizeof(Elf64_Phdr); return size; } @@ -595,8 +597,8 @@ static size_t get_elfcorehdr_size(int mem_chunk_cnt) int elfcorehdr_alloc(unsigned long long *addr, unsigned long long *size) { Elf64_Phdr *phdr_notes, *phdr_loads, *phdr_text; + int mem_chunk_cnt, phdr_text_cnt; size_t alloc_size; - int mem_chunk_cnt; void *ptr, *hdr; u64 hdr_off; @@ -615,12 +617,14 @@ int elfcorehdr_alloc(unsigned long long *addr, unsigned long long *size) } mem_chunk_cnt = get_mem_chunk_cnt(); + phdr_text_cnt = os_info_has_vm() ? 1 : 0; - alloc_size = get_elfcorehdr_size(mem_chunk_cnt); + alloc_size = get_elfcorehdr_size(mem_chunk_cnt + phdr_text_cnt); hdr = kzalloc(alloc_size, GFP_KERNEL); - /* Without elfcorehdr /proc/vmcore cannot be created. Thus creating + /* + * Without elfcorehdr /proc/vmcore cannot be created. Thus creating * a dump with this crash kernel will fail. Panic now to allow other * dump mechanisms to take over. */ @@ -628,21 +632,23 @@ int elfcorehdr_alloc(unsigned long long *addr, unsigned long long *size) panic("s390 kdump allocating elfcorehdr failed"); /* Init elf header */ - ptr = ehdr_init(hdr, mem_chunk_cnt); + phdr_notes = ehdr_init(hdr, mem_chunk_cnt + phdr_text_cnt); /* Init program headers */ - phdr_notes = ptr; - ptr = PTR_ADD(ptr, sizeof(Elf64_Phdr)); - phdr_text = ptr; - ptr = PTR_ADD(ptr, sizeof(Elf64_Phdr)); - phdr_loads = ptr; - ptr = PTR_ADD(ptr, sizeof(Elf64_Phdr) * mem_chunk_cnt); + if (phdr_text_cnt) { + phdr_text = phdr_notes + 1; + phdr_loads = phdr_text + 1; + } else { + phdr_loads = phdr_notes + 1; + } + ptr = PTR_ADD(phdr_loads, sizeof(Elf64_Phdr) * mem_chunk_cnt); /* Init notes */ hdr_off = PTR_DIFF(ptr, hdr); ptr = notes_init(phdr_notes, ptr, ((unsigned long) hdr) + hdr_off); /* Init kernel text program header */ - text_init(phdr_text); + if (phdr_text_cnt) + text_init(phdr_text); /* Init loads */ - loads_init(phdr_loads); + loads_init(phdr_loads, phdr_text_cnt); /* Finalize program headers */ hdr_off = PTR_DIFF(ptr, hdr); *addr = (unsigned long long) hdr;