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fs/binfmt_elf.c
60.6 KB
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/* * linux/fs/binfmt_elf.c * * These are the functions used to load ELF format executables as used * on SVr4 machines. Information on the format may be found in the book * "UNIX SYSTEM V RELEASE 4 Programmers Guide: Ansi C and Programming Support * Tools". * * Copyright 1993, 1994: Eric Youngdale (ericy@cais.com). */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/fs.h> |
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#include <linux/mm.h> #include <linux/mman.h> |
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#include <linux/errno.h> #include <linux/signal.h> #include <linux/binfmts.h> #include <linux/string.h> #include <linux/file.h> |
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#include <linux/slab.h> |
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#include <linux/personality.h> #include <linux/elfcore.h> #include <linux/init.h> #include <linux/highuid.h> |
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#include <linux/compiler.h> #include <linux/highmem.h> #include <linux/pagemap.h> |
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#include <linux/vmalloc.h> |
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#include <linux/security.h> |
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#include <linux/random.h> |
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#include <linux/elf.h> |
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#include <linux/utsname.h> |
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#include <linux/coredump.h> |
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#include <linux/sched.h> |
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#include <asm/uaccess.h> #include <asm/param.h> #include <asm/page.h> |
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#ifndef user_long_t #define user_long_t long #endif |
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#ifndef user_siginfo_t #define user_siginfo_t siginfo_t #endif |
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static int load_elf_binary(struct linux_binprm *bprm); |
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static unsigned long elf_map(struct file *, unsigned long, struct elf_phdr *, int, int, unsigned long); |
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#ifdef CONFIG_USELIB static int load_elf_library(struct file *); #else #define load_elf_library NULL #endif |
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/* * If we don't support core dumping, then supply a NULL so we * don't even try. */ |
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#ifdef CONFIG_ELF_CORE |
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static int elf_core_dump(struct coredump_params *cprm); |
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#else #define elf_core_dump NULL #endif #if ELF_EXEC_PAGESIZE > PAGE_SIZE |
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#define ELF_MIN_ALIGN ELF_EXEC_PAGESIZE |
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#else |
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#define ELF_MIN_ALIGN PAGE_SIZE |
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#endif #ifndef ELF_CORE_EFLAGS #define ELF_CORE_EFLAGS 0 #endif #define ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ELF_MIN_ALIGN-1)) #define ELF_PAGEOFFSET(_v) ((_v) & (ELF_MIN_ALIGN-1)) #define ELF_PAGEALIGN(_v) (((_v) + ELF_MIN_ALIGN - 1) & ~(ELF_MIN_ALIGN - 1)) static struct linux_binfmt elf_format = { |
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.module = THIS_MODULE, .load_binary = load_elf_binary, .load_shlib = load_elf_library, .core_dump = elf_core_dump, .min_coredump = ELF_EXEC_PAGESIZE, |
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}; |
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#define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE) |
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static int set_brk(unsigned long start, unsigned long end) { start = ELF_PAGEALIGN(start); end = ELF_PAGEALIGN(end); if (end > start) { unsigned long addr; |
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addr = vm_brk(start, end - start); |
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if (BAD_ADDR(addr)) return addr; } current->mm->start_brk = current->mm->brk = end; return 0; } |
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/* We need to explicitly zero any fractional pages after the data section (i.e. bss). This would contain the junk from the file that should not |
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be in memory */ |
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static int padzero(unsigned long elf_bss) { unsigned long nbyte; nbyte = ELF_PAGEOFFSET(elf_bss); if (nbyte) { nbyte = ELF_MIN_ALIGN - nbyte; if (clear_user((void __user *) elf_bss, nbyte)) return -EFAULT; } return 0; } |
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/* Let's use some macros to make this stack manipulation a little clearer */ |
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#ifdef CONFIG_STACK_GROWSUP #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) + (items)) #define STACK_ROUND(sp, items) \ ((15 + (unsigned long) ((sp) + (items))) &~ 15UL) |
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#define STACK_ALLOC(sp, len) ({ \ elf_addr_t __user *old_sp = (elf_addr_t __user *)sp; sp += len; \ old_sp; }) |
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#else #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) - (items)) #define STACK_ROUND(sp, items) \ (((unsigned long) (sp - items)) &~ 15UL) #define STACK_ALLOC(sp, len) ({ sp -= len ; sp; }) #endif |
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#ifndef ELF_BASE_PLATFORM /* * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture. * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value * will be copied to the user stack in the same manner as AT_PLATFORM. */ #define ELF_BASE_PLATFORM NULL #endif |
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static int |
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create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec, |
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unsigned long load_addr, unsigned long interp_load_addr) |
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{ unsigned long p = bprm->p; int argc = bprm->argc; int envc = bprm->envc; elf_addr_t __user *argv; elf_addr_t __user *envp; elf_addr_t __user *sp; elf_addr_t __user *u_platform; |
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elf_addr_t __user *u_base_platform; |
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elf_addr_t __user *u_rand_bytes; |
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const char *k_platform = ELF_PLATFORM; |
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const char *k_base_platform = ELF_BASE_PLATFORM; |
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unsigned char k_rand_bytes[16]; |
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int items; elf_addr_t *elf_info; int ei_index = 0; |
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const struct cred *cred = current_cred(); |
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struct vm_area_struct *vma; |
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/* |
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* In some cases (e.g. Hyper-Threading), we want to avoid L1 * evictions by the processes running on the same package. One * thing we can do is to shuffle the initial stack for them. */ p = arch_align_stack(p); /* |
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* If this architecture has a platform capability string, copy it * to userspace. In some cases (Sparc), this info is impossible * for userspace to get any other way, in others (i386) it is * merely difficult. */ |
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u_platform = NULL; if (k_platform) { size_t len = strlen(k_platform) + 1; |
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u_platform = (elf_addr_t __user *)STACK_ALLOC(p, len); if (__copy_to_user(u_platform, k_platform, len)) return -EFAULT; } |
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/* * If this architecture has a "base" platform capability * string, copy it to userspace. */ u_base_platform = NULL; if (k_base_platform) { size_t len = strlen(k_base_platform) + 1; u_base_platform = (elf_addr_t __user *)STACK_ALLOC(p, len); if (__copy_to_user(u_base_platform, k_base_platform, len)) return -EFAULT; } |
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/* * Generate 16 random bytes for userspace PRNG seeding. */ get_random_bytes(k_rand_bytes, sizeof(k_rand_bytes)); u_rand_bytes = (elf_addr_t __user *) STACK_ALLOC(p, sizeof(k_rand_bytes)); if (__copy_to_user(u_rand_bytes, k_rand_bytes, sizeof(k_rand_bytes))) return -EFAULT; |
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/* Create the ELF interpreter info */ |
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elf_info = (elf_addr_t *)current->mm->saved_auxv; |
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/* update AT_VECTOR_SIZE_BASE if the number of NEW_AUX_ENT() changes */ |
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#define NEW_AUX_ENT(id, val) \ |
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do { \ |
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elf_info[ei_index++] = id; \ elf_info[ei_index++] = val; \ |
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} while (0) |
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#ifdef ARCH_DLINFO /* * ARCH_DLINFO must come first so PPC can do its special alignment of * AUXV. |
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* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT() in * ARCH_DLINFO changes |
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*/ ARCH_DLINFO; #endif NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP); NEW_AUX_ENT(AT_PAGESZ, ELF_EXEC_PAGESIZE); NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC); NEW_AUX_ENT(AT_PHDR, load_addr + exec->e_phoff); |
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NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr)); |
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NEW_AUX_ENT(AT_PHNUM, exec->e_phnum); NEW_AUX_ENT(AT_BASE, interp_load_addr); NEW_AUX_ENT(AT_FLAGS, 0); NEW_AUX_ENT(AT_ENTRY, exec->e_entry); |
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NEW_AUX_ENT(AT_UID, from_kuid_munged(cred->user_ns, cred->uid)); NEW_AUX_ENT(AT_EUID, from_kuid_munged(cred->user_ns, cred->euid)); NEW_AUX_ENT(AT_GID, from_kgid_munged(cred->user_ns, cred->gid)); NEW_AUX_ENT(AT_EGID, from_kgid_munged(cred->user_ns, cred->egid)); |
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NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm)); |
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NEW_AUX_ENT(AT_RANDOM, (elf_addr_t)(unsigned long)u_rand_bytes); |
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#ifdef ELF_HWCAP2 NEW_AUX_ENT(AT_HWCAP2, ELF_HWCAP2); #endif |
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NEW_AUX_ENT(AT_EXECFN, bprm->exec); |
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if (k_platform) { |
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NEW_AUX_ENT(AT_PLATFORM, |
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(elf_addr_t)(unsigned long)u_platform); |
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} |
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if (k_base_platform) { NEW_AUX_ENT(AT_BASE_PLATFORM, (elf_addr_t)(unsigned long)u_base_platform); } |
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if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) { |
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NEW_AUX_ENT(AT_EXECFD, bprm->interp_data); |
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} #undef NEW_AUX_ENT /* AT_NULL is zero; clear the rest too */ memset(&elf_info[ei_index], 0, sizeof current->mm->saved_auxv - ei_index * sizeof elf_info[0]); /* And advance past the AT_NULL entry. */ ei_index += 2; sp = STACK_ADD(p, ei_index); |
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items = (argc + 1) + (envc + 1) + 1; |
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bprm->p = STACK_ROUND(sp, items); /* Point sp at the lowest address on the stack */ #ifdef CONFIG_STACK_GROWSUP sp = (elf_addr_t __user *)bprm->p - items - ei_index; |
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bprm->exec = (unsigned long)sp; /* XXX: PARISC HACK */ |
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#else sp = (elf_addr_t __user *)bprm->p; #endif |
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/* * Grow the stack manually; some architectures have a limit on how * far ahead a user-space access may be in order to grow the stack. */ vma = find_extend_vma(current->mm, bprm->p); if (!vma) return -EFAULT; |
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/* Now, let's put argc (and argv, envp if appropriate) on the stack */ if (__put_user(argc, sp++)) return -EFAULT; |
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argv = sp; envp = argv + argc + 1; |
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/* Populate argv and envp */ |
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p = current->mm->arg_end = current->mm->arg_start; |
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while (argc-- > 0) { size_t len; |
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if (__put_user((elf_addr_t)p, argv++)) return -EFAULT; |
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len = strnlen_user((void __user *)p, MAX_ARG_STRLEN); if (!len || len > MAX_ARG_STRLEN) |
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return -EINVAL; |
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p += len; } if (__put_user(0, argv)) return -EFAULT; current->mm->arg_end = current->mm->env_start = p; while (envc-- > 0) { size_t len; |
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if (__put_user((elf_addr_t)p, envp++)) return -EFAULT; |
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len = strnlen_user((void __user *)p, MAX_ARG_STRLEN); if (!len || len > MAX_ARG_STRLEN) |
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return -EINVAL; |
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p += len; } if (__put_user(0, envp)) return -EFAULT; current->mm->env_end = p; /* Put the elf_info on the stack in the right place. */ sp = (elf_addr_t __user *)envp + 1; if (copy_to_user(sp, elf_info, ei_index * sizeof(elf_addr_t))) return -EFAULT; return 0; } |
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#ifndef elf_map |
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static unsigned long elf_map(struct file *filep, unsigned long addr, |
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struct elf_phdr *eppnt, int prot, int type, unsigned long total_size) |
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{ unsigned long map_addr; |
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unsigned long size = eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr); unsigned long off = eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr); addr = ELF_PAGESTART(addr); size = ELF_PAGEALIGN(size); |
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|
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/* mmap() will return -EINVAL if given a zero size, but a * segment with zero filesize is perfectly valid */ |
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if (!size) return addr; |
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/* * total_size is the size of the ELF (interpreter) image. * The _first_ mmap needs to know the full size, otherwise * randomization might put this image into an overlapping * position with the ELF binary image. (since size < total_size) * So we first map the 'big' image - and unmap the remainder at * the end. (which unmap is needed for ELF images with holes.) */ if (total_size) { total_size = ELF_PAGEALIGN(total_size); |
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map_addr = vm_mmap(filep, addr, total_size, prot, type, off); |
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if (!BAD_ADDR(map_addr)) |
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vm_munmap(map_addr+size, total_size-size); |
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} else |
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map_addr = vm_mmap(filep, addr, size, prot, type, off); |
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|
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return(map_addr); } |
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#endif /* !elf_map */ |
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static unsigned long total_mapping_size(struct elf_phdr *cmds, int nr) { int i, first_idx = -1, last_idx = -1; for (i = 0; i < nr; i++) { if (cmds[i].p_type == PT_LOAD) { last_idx = i; if (first_idx == -1) first_idx = i; } } if (first_idx == -1) return 0; return cmds[last_idx].p_vaddr + cmds[last_idx].p_memsz - ELF_PAGESTART(cmds[first_idx].p_vaddr); } |
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/** * load_elf_phdrs() - load ELF program headers * @elf_ex: ELF header of the binary whose program headers should be loaded * @elf_file: the opened ELF binary file * * Loads ELF program headers from the binary file elf_file, which has the ELF * header pointed to by elf_ex, into a newly allocated array. The caller is * responsible for freeing the allocated data. Returns an ERR_PTR upon failure. */ static struct elf_phdr *load_elf_phdrs(struct elfhdr *elf_ex, struct file *elf_file) { struct elf_phdr *elf_phdata = NULL; int retval, size, err = -1; /* * If the size of this structure has changed, then punt, since * we will be doing the wrong thing. */ if (elf_ex->e_phentsize != sizeof(struct elf_phdr)) goto out; /* Sanity check the number of program headers... */ if (elf_ex->e_phnum < 1 || elf_ex->e_phnum > 65536U / sizeof(struct elf_phdr)) goto out; /* ...and their total size. */ size = sizeof(struct elf_phdr) * elf_ex->e_phnum; if (size > ELF_MIN_ALIGN) goto out; elf_phdata = kmalloc(size, GFP_KERNEL); if (!elf_phdata) goto out; /* Read in the program headers */ retval = kernel_read(elf_file, elf_ex->e_phoff, (char *)elf_phdata, size); if (retval != size) { err = (retval < 0) ? retval : -EIO; goto out; } /* Success! */ err = 0; out: if (err) { kfree(elf_phdata); elf_phdata = NULL; } return elf_phdata; } |
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774c105ed binfmt_elf: allow... |
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#ifndef CONFIG_ARCH_BINFMT_ELF_STATE /** * struct arch_elf_state - arch-specific ELF loading state * * This structure is used to preserve architecture specific data during * the loading of an ELF file, throughout the checking of architecture * specific ELF headers & through to the point where the ELF load is * known to be proceeding (ie. SET_PERSONALITY). * * This implementation is a dummy for architectures which require no * specific state. */ struct arch_elf_state { }; #define INIT_ARCH_ELF_STATE {} /** * arch_elf_pt_proc() - check a PT_LOPROC..PT_HIPROC ELF program header * @ehdr: The main ELF header * @phdr: The program header to check * @elf: The open ELF file * @is_interp: True if the phdr is from the interpreter of the ELF being * loaded, else false. * @state: Architecture-specific state preserved throughout the process * of loading the ELF. * * Inspects the program header phdr to validate its correctness and/or * suitability for the system. Called once per ELF program header in the * range PT_LOPROC to PT_HIPROC, for both the ELF being loaded and its * interpreter. * * Return: Zero to proceed with the ELF load, non-zero to fail the ELF load * with that return code. */ static inline int arch_elf_pt_proc(struct elfhdr *ehdr, struct elf_phdr *phdr, struct file *elf, bool is_interp, struct arch_elf_state *state) { /* Dummy implementation, always proceed */ return 0; } /** * arch_check_elf() - check a PT_LOPROC..PT_HIPROC ELF program header * @ehdr: The main ELF header * @has_interp: True if the ELF has an interpreter, else false. * @state: Architecture-specific state preserved throughout the process * of loading the ELF. * * Provides a final opportunity for architecture code to reject the loading * of the ELF & cause an exec syscall to return an error. This is called after * all program headers to be checked by arch_elf_pt_proc have been. * * Return: Zero to proceed with the ELF load, non-zero to fail the ELF load * with that return code. */ static inline int arch_check_elf(struct elfhdr *ehdr, bool has_interp, struct arch_elf_state *state) { /* Dummy implementation, always proceed */ return 0; } #endif /* !CONFIG_ARCH_BINFMT_ELF_STATE */ |
cc503c1b4 x86: PIE executab... |
489 |
|
1da177e4c Linux-2.6.12-rc2 |
490 491 492 493 |
/* This is much more generalized than the library routine read function, so we keep this separate. Technically the library read function is only provided so that we can read a.out libraries that have an ELF header */ |
f4e5cc2c4 [PATCH] binfmt_el... |
494 |
static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex, |
cc503c1b4 x86: PIE executab... |
495 |
struct file *interpreter, unsigned long *interp_map_addr, |
a9d9ef133 binfmt_elf: load ... |
496 |
unsigned long no_base, struct elf_phdr *interp_elf_phdata) |
1da177e4c Linux-2.6.12-rc2 |
497 |
{ |
1da177e4c Linux-2.6.12-rc2 |
498 499 500 501 502 |
struct elf_phdr *eppnt; unsigned long load_addr = 0; int load_addr_set = 0; unsigned long last_bss = 0, elf_bss = 0; unsigned long error = ~0UL; |
cc503c1b4 x86: PIE executab... |
503 |
unsigned long total_size; |
6a8d38945 binfmt_elf: Hoist... |
504 |
int i; |
1da177e4c Linux-2.6.12-rc2 |
505 506 507 508 509 510 511 |
/* First of all, some simple consistency checks */ if (interp_elf_ex->e_type != ET_EXEC && interp_elf_ex->e_type != ET_DYN) goto out; if (!elf_check_arch(interp_elf_ex)) goto out; |
72c2d5319 file->f_op is nev... |
512 |
if (!interpreter->f_op->mmap) |
1da177e4c Linux-2.6.12-rc2 |
513 |
goto out; |
a9d9ef133 binfmt_elf: load ... |
514 515 |
total_size = total_mapping_size(interp_elf_phdata, interp_elf_ex->e_phnum); |
cc503c1b4 x86: PIE executab... |
516 517 |
if (!total_size) { error = -EINVAL; |
a9d9ef133 binfmt_elf: load ... |
518 |
goto out; |
cc503c1b4 x86: PIE executab... |
519 |
} |
a9d9ef133 binfmt_elf: load ... |
520 |
eppnt = interp_elf_phdata; |
f4e5cc2c4 [PATCH] binfmt_el... |
521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 |
for (i = 0; i < interp_elf_ex->e_phnum; i++, eppnt++) { if (eppnt->p_type == PT_LOAD) { int elf_type = MAP_PRIVATE | MAP_DENYWRITE; int elf_prot = 0; unsigned long vaddr = 0; unsigned long k, map_addr; if (eppnt->p_flags & PF_R) elf_prot = PROT_READ; if (eppnt->p_flags & PF_W) elf_prot |= PROT_WRITE; if (eppnt->p_flags & PF_X) elf_prot |= PROT_EXEC; vaddr = eppnt->p_vaddr; if (interp_elf_ex->e_type == ET_EXEC || load_addr_set) elf_type |= MAP_FIXED; |
cc503c1b4 x86: PIE executab... |
537 538 |
else if (no_base && interp_elf_ex->e_type == ET_DYN) load_addr = -vaddr; |
f4e5cc2c4 [PATCH] binfmt_el... |
539 540 |
map_addr = elf_map(interpreter, load_addr + vaddr, |
bb1ad8205 x86: PIE executab... |
541 |
eppnt, elf_prot, elf_type, total_size); |
cc503c1b4 x86: PIE executab... |
542 543 544 |
total_size = 0; if (!*interp_map_addr) *interp_map_addr = map_addr; |
f4e5cc2c4 [PATCH] binfmt_el... |
545 546 |
error = map_addr; if (BAD_ADDR(map_addr)) |
a9d9ef133 binfmt_elf: load ... |
547 |
goto out; |
f4e5cc2c4 [PATCH] binfmt_el... |
548 549 550 551 552 553 554 555 556 557 558 559 560 |
if (!load_addr_set && interp_elf_ex->e_type == ET_DYN) { load_addr = map_addr - ELF_PAGESTART(vaddr); load_addr_set = 1; } /* * Check to see if the section's size will overflow the * allowed task size. Note that p_filesz must always be * <= p_memsize so it's only necessary to check p_memsz. */ k = load_addr + eppnt->p_vaddr; |
ce51059be [PATCH] binfmt_el... |
561 |
if (BAD_ADDR(k) || |
f4e5cc2c4 [PATCH] binfmt_el... |
562 563 564 565 |
eppnt->p_filesz > eppnt->p_memsz || eppnt->p_memsz > TASK_SIZE || TASK_SIZE - eppnt->p_memsz < k) { error = -ENOMEM; |
a9d9ef133 binfmt_elf: load ... |
566 |
goto out; |
f4e5cc2c4 [PATCH] binfmt_el... |
567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 |
} /* * Find the end of the file mapping for this phdr, and * keep track of the largest address we see for this. */ k = load_addr + eppnt->p_vaddr + eppnt->p_filesz; if (k > elf_bss) elf_bss = k; /* * Do the same thing for the memory mapping - between * elf_bss and last_bss is the bss section. */ k = load_addr + eppnt->p_memsz + eppnt->p_vaddr; if (k > last_bss) last_bss = k; } |
1da177e4c Linux-2.6.12-rc2 |
585 |
} |
752015d1b binfmt_elf: fix P... |
586 587 588 589 590 591 592 593 594 |
if (last_bss > elf_bss) { /* * Now fill out the bss section. First pad the last page up * to the page boundary, and then perform a mmap to make sure * that there are zero-mapped pages up to and including the * last bss page. */ if (padzero(elf_bss)) { error = -EFAULT; |
a9d9ef133 binfmt_elf: load ... |
595 |
goto out; |
752015d1b binfmt_elf: fix P... |
596 |
} |
1da177e4c Linux-2.6.12-rc2 |
597 |
|
752015d1b binfmt_elf: fix P... |
598 599 |
/* What we have mapped so far */ elf_bss = ELF_PAGESTART(elf_bss + ELF_MIN_ALIGN - 1); |
1da177e4c Linux-2.6.12-rc2 |
600 |
|
752015d1b binfmt_elf: fix P... |
601 |
/* Map the last of the bss segment */ |
e4eb1ff61 VM: add "vm_brk()... |
602 |
error = vm_brk(elf_bss, last_bss - elf_bss); |
1da177e4c Linux-2.6.12-rc2 |
603 |
if (BAD_ADDR(error)) |
a9d9ef133 binfmt_elf: load ... |
604 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
605 |
} |
cc503c1b4 x86: PIE executab... |
606 |
error = load_addr; |
1da177e4c Linux-2.6.12-rc2 |
607 608 609 |
out: return error; } |
1da177e4c Linux-2.6.12-rc2 |
610 611 612 613 |
/* * These are the functions used to load ELF style executables and shared * libraries. There is no binary dependent code anywhere else. */ |
913bd9060 [PATCH] x86_64: I... |
614 |
#ifndef STACK_RND_MASK |
d1cabd632 [PATCH] fix proce... |
615 |
#define STACK_RND_MASK (0x7ff >> (PAGE_SHIFT - 12)) /* 8MB of VA */ |
913bd9060 [PATCH] x86_64: I... |
616 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
617 618 619 620 |
static unsigned long randomize_stack_top(unsigned long stack_top) { unsigned int random_variable = 0; |
c16b63e09 [PATCH] i386/x86-... |
621 622 |
if ((current->flags & PF_RANDOMIZE) && !(current->personality & ADDR_NO_RANDOMIZE)) { |
913bd9060 [PATCH] x86_64: I... |
623 624 625 |
random_variable = get_random_int() & STACK_RND_MASK; random_variable <<= PAGE_SHIFT; } |
1da177e4c Linux-2.6.12-rc2 |
626 |
#ifdef CONFIG_STACK_GROWSUP |
913bd9060 [PATCH] x86_64: I... |
627 |
return PAGE_ALIGN(stack_top) + random_variable; |
1da177e4c Linux-2.6.12-rc2 |
628 |
#else |
913bd9060 [PATCH] x86_64: I... |
629 |
return PAGE_ALIGN(stack_top) - random_variable; |
1da177e4c Linux-2.6.12-rc2 |
630 631 |
#endif } |
71613c3b8 get rid of pt_reg... |
632 |
static int load_elf_binary(struct linux_binprm *bprm) |
1da177e4c Linux-2.6.12-rc2 |
633 634 635 636 637 |
{ struct file *interpreter = NULL; /* to shut gcc up */ unsigned long load_addr = 0, load_bias = 0; int load_addr_set = 0; char * elf_interpreter = NULL; |
1da177e4c Linux-2.6.12-rc2 |
638 |
unsigned long error; |
a9d9ef133 binfmt_elf: load ... |
639 |
struct elf_phdr *elf_ppnt, *elf_phdata, *interp_elf_phdata = NULL; |
1da177e4c Linux-2.6.12-rc2 |
640 |
unsigned long elf_bss, elf_brk; |
1da177e4c Linux-2.6.12-rc2 |
641 |
int retval, i; |
cc503c1b4 x86: PIE executab... |
642 643 |
unsigned long elf_entry; unsigned long interp_load_addr = 0; |
1da177e4c Linux-2.6.12-rc2 |
644 |
unsigned long start_code, end_code, start_data, end_data; |
1a530a6f2 binfmt_elf: quiet... |
645 |
unsigned long reloc_func_desc __maybe_unused = 0; |
8de61e69c [PATCH] fs: remov... |
646 |
int executable_stack = EXSTACK_DEFAULT; |
71613c3b8 get rid of pt_reg... |
647 |
struct pt_regs *regs = current_pt_regs(); |
1da177e4c Linux-2.6.12-rc2 |
648 649 650 |
struct { struct elfhdr elf_ex; struct elfhdr interp_elf_ex; |
1da177e4c Linux-2.6.12-rc2 |
651 |
} *loc; |
774c105ed binfmt_elf: allow... |
652 |
struct arch_elf_state arch_state = INIT_ARCH_ELF_STATE; |
1da177e4c Linux-2.6.12-rc2 |
653 654 655 656 657 658 659 660 |
loc = kmalloc(sizeof(*loc), GFP_KERNEL); if (!loc) { retval = -ENOMEM; goto out_ret; } /* Get the exec-header */ |
f4e5cc2c4 [PATCH] binfmt_el... |
661 |
loc->elf_ex = *((struct elfhdr *)bprm->buf); |
1da177e4c Linux-2.6.12-rc2 |
662 663 664 665 666 667 668 669 670 671 |
retval = -ENOEXEC; /* First of all, some simple consistency checks */ if (memcmp(loc->elf_ex.e_ident, ELFMAG, SELFMAG) != 0) goto out; if (loc->elf_ex.e_type != ET_EXEC && loc->elf_ex.e_type != ET_DYN) goto out; if (!elf_check_arch(&loc->elf_ex)) goto out; |
72c2d5319 file->f_op is nev... |
672 |
if (!bprm->file->f_op->mmap) |
1da177e4c Linux-2.6.12-rc2 |
673 |
goto out; |
6a8d38945 binfmt_elf: Hoist... |
674 |
elf_phdata = load_elf_phdrs(&loc->elf_ex, bprm->file); |
1da177e4c Linux-2.6.12-rc2 |
675 676 |
if (!elf_phdata) goto out; |
1da177e4c Linux-2.6.12-rc2 |
677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 |
elf_ppnt = elf_phdata; elf_bss = 0; elf_brk = 0; start_code = ~0UL; end_code = 0; start_data = 0; end_data = 0; for (i = 0; i < loc->elf_ex.e_phnum; i++) { if (elf_ppnt->p_type == PT_INTERP) { /* This is the program interpreter used for * shared libraries - for now assume that this * is an a.out format binary */ |
1da177e4c Linux-2.6.12-rc2 |
692 693 694 |
retval = -ENOEXEC; if (elf_ppnt->p_filesz > PATH_MAX || elf_ppnt->p_filesz < 2) |
e7b9b550f Don't mess with d... |
695 |
goto out_free_ph; |
1da177e4c Linux-2.6.12-rc2 |
696 697 |
retval = -ENOMEM; |
792db3af3 [PATCH] fs/binfmt... |
698 |
elf_interpreter = kmalloc(elf_ppnt->p_filesz, |
f4e5cc2c4 [PATCH] binfmt_el... |
699 |
GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
700 |
if (!elf_interpreter) |
e7b9b550f Don't mess with d... |
701 |
goto out_free_ph; |
1da177e4c Linux-2.6.12-rc2 |
702 703 |
retval = kernel_read(bprm->file, elf_ppnt->p_offset, |
f4e5cc2c4 [PATCH] binfmt_el... |
704 705 |
elf_interpreter, elf_ppnt->p_filesz); |
1da177e4c Linux-2.6.12-rc2 |
706 707 708 709 710 711 712 713 714 |
if (retval != elf_ppnt->p_filesz) { if (retval >= 0) retval = -EIO; goto out_free_interp; } /* make sure path is NULL terminated */ retval = -ENOEXEC; if (elf_interpreter[elf_ppnt->p_filesz - 1] != '\0') goto out_free_interp; |
1da177e4c Linux-2.6.12-rc2 |
715 716 717 718 |
interpreter = open_exec(elf_interpreter); retval = PTR_ERR(interpreter); if (IS_ERR(interpreter)) goto out_free_interp; |
1fb844961 [PATCH] core-dump... |
719 720 721 722 723 724 |
/* * If the binary is not readable then enforce * mm->dumpable = 0 regardless of the interpreter's * permissions. */ |
1b5d783c9 consolidate BINPR... |
725 |
would_dump(bprm, interpreter); |
1fb844961 [PATCH] core-dump... |
726 |
|
f4e5cc2c4 [PATCH] binfmt_el... |
727 728 |
retval = kernel_read(interpreter, 0, bprm->buf, BINPRM_BUF_SIZE); |
1da177e4c Linux-2.6.12-rc2 |
729 730 731 732 733 734 735 |
if (retval != BINPRM_BUF_SIZE) { if (retval >= 0) retval = -EIO; goto out_free_dentry; } /* Get the exec headers */ |
f4e5cc2c4 [PATCH] binfmt_el... |
736 |
loc->interp_elf_ex = *((struct elfhdr *)bprm->buf); |
1da177e4c Linux-2.6.12-rc2 |
737 738 739 740 741 742 743 |
break; } elf_ppnt++; } elf_ppnt = elf_phdata; for (i = 0; i < loc->elf_ex.e_phnum; i++, elf_ppnt++) |
774c105ed binfmt_elf: allow... |
744 745 |
switch (elf_ppnt->p_type) { case PT_GNU_STACK: |
1da177e4c Linux-2.6.12-rc2 |
746 747 748 749 750 |
if (elf_ppnt->p_flags & PF_X) executable_stack = EXSTACK_ENABLE_X; else executable_stack = EXSTACK_DISABLE_X; break; |
774c105ed binfmt_elf: allow... |
751 752 753 754 755 756 757 758 |
case PT_LOPROC ... PT_HIPROC: retval = arch_elf_pt_proc(&loc->elf_ex, elf_ppnt, bprm->file, false, &arch_state); if (retval) goto out_free_dentry; break; |
1da177e4c Linux-2.6.12-rc2 |
759 |
} |
1da177e4c Linux-2.6.12-rc2 |
760 761 762 |
/* Some simple consistency checks for the interpreter */ if (elf_interpreter) { |
1da177e4c Linux-2.6.12-rc2 |
763 |
retval = -ELIBBAD; |
d20894a23 Remove a.out inte... |
764 765 |
/* Not an ELF interpreter */ if (memcmp(loc->interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0) |
1da177e4c Linux-2.6.12-rc2 |
766 |
goto out_free_dentry; |
1da177e4c Linux-2.6.12-rc2 |
767 |
/* Verify the interpreter has a valid arch */ |
d20894a23 Remove a.out inte... |
768 |
if (!elf_check_arch(&loc->interp_elf_ex)) |
1da177e4c Linux-2.6.12-rc2 |
769 |
goto out_free_dentry; |
a9d9ef133 binfmt_elf: load ... |
770 771 772 773 774 775 |
/* Load the interpreter program headers */ interp_elf_phdata = load_elf_phdrs(&loc->interp_elf_ex, interpreter); if (!interp_elf_phdata) goto out_free_dentry; |
774c105ed binfmt_elf: allow... |
776 777 778 779 780 781 782 783 784 785 786 787 788 |
/* Pass PT_LOPROC..PT_HIPROC headers to arch code */ elf_ppnt = interp_elf_phdata; for (i = 0; i < loc->interp_elf_ex.e_phnum; i++, elf_ppnt++) switch (elf_ppnt->p_type) { case PT_LOPROC ... PT_HIPROC: retval = arch_elf_pt_proc(&loc->interp_elf_ex, elf_ppnt, interpreter, true, &arch_state); if (retval) goto out_free_dentry; break; } |
1da177e4c Linux-2.6.12-rc2 |
789 |
} |
774c105ed binfmt_elf: allow... |
790 791 792 793 794 795 796 797 |
/* * Allow arch code to reject the ELF at this point, whilst it's * still possible to return an error to the code that invoked * the exec syscall. */ retval = arch_check_elf(&loc->elf_ex, !!interpreter, &arch_state); if (retval) goto out_free_dentry; |
1da177e4c Linux-2.6.12-rc2 |
798 799 800 801 |
/* Flush all traces of the currently running executable */ retval = flush_old_exec(bprm); if (retval) goto out_free_dentry; |
1da177e4c Linux-2.6.12-rc2 |
802 803 |
/* Do this immediately, since STACK_TOP as used in setup_arg_pages may depend on the personality. */ |
774c105ed binfmt_elf: allow... |
804 |
SET_PERSONALITY2(loc->elf_ex, &arch_state); |
1da177e4c Linux-2.6.12-rc2 |
805 806 |
if (elf_read_implies_exec(loc->elf_ex, executable_stack)) current->personality |= READ_IMPLIES_EXEC; |
f4e5cc2c4 [PATCH] binfmt_el... |
807 |
if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space) |
1da177e4c Linux-2.6.12-rc2 |
808 |
current->flags |= PF_RANDOMIZE; |
221af7f87 Split 'flush_old_... |
809 810 |
setup_new_exec(bprm); |
1da177e4c Linux-2.6.12-rc2 |
811 812 813 |
/* Do this so that we can load the interpreter, if need be. We will change some of these later */ |
1da177e4c Linux-2.6.12-rc2 |
814 815 |
retval = setup_arg_pages(bprm, randomize_stack_top(STACK_TOP), executable_stack); |
19d860a14 handle suicide on... |
816 |
if (retval < 0) |
1da177e4c Linux-2.6.12-rc2 |
817 |
goto out_free_dentry; |
1da177e4c Linux-2.6.12-rc2 |
818 |
|
1da177e4c Linux-2.6.12-rc2 |
819 |
current->mm->start_stack = bprm->p; |
af901ca18 tree-wide: fix as... |
820 |
/* Now we do a little grungy work by mmapping the ELF image into |
cc503c1b4 x86: PIE executab... |
821 |
the correct location in memory. */ |
f4e5cc2c4 [PATCH] binfmt_el... |
822 823 |
for(i = 0, elf_ppnt = elf_phdata; i < loc->elf_ex.e_phnum; i++, elf_ppnt++) { |
1da177e4c Linux-2.6.12-rc2 |
824 825 826 827 828 829 830 831 832 833 834 835 |
int elf_prot = 0, elf_flags; unsigned long k, vaddr; if (elf_ppnt->p_type != PT_LOAD) continue; if (unlikely (elf_brk > elf_bss)) { unsigned long nbyte; /* There was a PT_LOAD segment with p_memsz > p_filesz before this one. Map anonymous pages, if needed, and clear the area. */ |
f670d0ecd binfmt_elf: cleanups |
836 837 |
retval = set_brk(elf_bss + load_bias, elf_brk + load_bias); |
19d860a14 handle suicide on... |
838 |
if (retval) |
1da177e4c Linux-2.6.12-rc2 |
839 |
goto out_free_dentry; |
1da177e4c Linux-2.6.12-rc2 |
840 841 842 843 844 845 846 847 848 |
nbyte = ELF_PAGEOFFSET(elf_bss); if (nbyte) { nbyte = ELF_MIN_ALIGN - nbyte; if (nbyte > elf_brk - elf_bss) nbyte = elf_brk - elf_bss; if (clear_user((void __user *)elf_bss + load_bias, nbyte)) { /* * This bss-zeroing can fail if the ELF |
f4e5cc2c4 [PATCH] binfmt_el... |
849 |
* file specifies odd protections. So |
1da177e4c Linux-2.6.12-rc2 |
850 851 852 853 854 |
* we don't check the return value */ } } } |
f4e5cc2c4 [PATCH] binfmt_el... |
855 856 857 858 859 860 |
if (elf_ppnt->p_flags & PF_R) elf_prot |= PROT_READ; if (elf_ppnt->p_flags & PF_W) elf_prot |= PROT_WRITE; if (elf_ppnt->p_flags & PF_X) elf_prot |= PROT_EXEC; |
1da177e4c Linux-2.6.12-rc2 |
861 |
|
f4e5cc2c4 [PATCH] binfmt_el... |
862 |
elf_flags = MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE; |
1da177e4c Linux-2.6.12-rc2 |
863 864 865 866 867 |
vaddr = elf_ppnt->p_vaddr; if (loc->elf_ex.e_type == ET_EXEC || load_addr_set) { elf_flags |= MAP_FIXED; } else if (loc->elf_ex.e_type == ET_DYN) { |
f4e5cc2c4 [PATCH] binfmt_el... |
868 869 870 871 |
/* Try and get dynamic programs out of the way of the * default mmap base, as well as whatever program they * might try to exec. This is because the brk will * follow the loader, and is not movable. */ |
e39f56023 fs: binfmt_elf: c... |
872 |
#ifdef CONFIG_ARCH_BINFMT_ELF_RANDOMIZE_PIE |
a3defbe5c binfmt_elf: fix P... |
873 |
/* Memory randomization might have been switched off |
c1d025e22 binfmt_elf: PIE: ... |
874 875 |
* in runtime via sysctl or explicit setting of * personality flags. |
a3defbe5c binfmt_elf: fix P... |
876 877 878 879 880 881 882 883 |
* If that is the case, retain the original non-zero * load_bias value in order to establish proper * non-randomized mappings. */ if (current->flags & PF_RANDOMIZE) load_bias = 0; else load_bias = ELF_PAGESTART(ELF_ET_DYN_BASE - vaddr); |
cc503c1b4 x86: PIE executab... |
884 |
#else |
90cb28e8f Revert "[PATCH] b... |
885 |
load_bias = ELF_PAGESTART(ELF_ET_DYN_BASE - vaddr); |
cc503c1b4 x86: PIE executab... |
886 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
887 |
} |
f4e5cc2c4 [PATCH] binfmt_el... |
888 |
error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt, |
bb1ad8205 x86: PIE executab... |
889 |
elf_prot, elf_flags, 0); |
1da177e4c Linux-2.6.12-rc2 |
890 |
if (BAD_ADDR(error)) { |
b140f2510 Invalid return va... |
891 892 |
retval = IS_ERR((void *)error) ? PTR_ERR((void*)error) : -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
893 894 895 896 897 898 899 900 901 902 903 904 905 906 |
goto out_free_dentry; } if (!load_addr_set) { load_addr_set = 1; load_addr = (elf_ppnt->p_vaddr - elf_ppnt->p_offset); if (loc->elf_ex.e_type == ET_DYN) { load_bias += error - ELF_PAGESTART(load_bias + vaddr); load_addr += load_bias; reloc_func_desc = load_bias; } } k = elf_ppnt->p_vaddr; |
f4e5cc2c4 [PATCH] binfmt_el... |
907 908 909 910 |
if (k < start_code) start_code = k; if (start_data < k) start_data = k; |
1da177e4c Linux-2.6.12-rc2 |
911 912 913 914 915 916 |
/* * Check to see if the section's size will overflow the * allowed task size. Note that p_filesz must always be * <= p_memsz so it is only necessary to check p_memsz. */ |
ce51059be [PATCH] binfmt_el... |
917 |
if (BAD_ADDR(k) || elf_ppnt->p_filesz > elf_ppnt->p_memsz || |
1da177e4c Linux-2.6.12-rc2 |
918 919 |
elf_ppnt->p_memsz > TASK_SIZE || TASK_SIZE - elf_ppnt->p_memsz < k) { |
f4e5cc2c4 [PATCH] binfmt_el... |
920 |
/* set_brk can never work. Avoid overflows. */ |
b140f2510 Invalid return va... |
921 |
retval = -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 |
goto out_free_dentry; } k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz; if (k > elf_bss) elf_bss = k; if ((elf_ppnt->p_flags & PF_X) && end_code < k) end_code = k; if (end_data < k) end_data = k; k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz; if (k > elf_brk) elf_brk = k; } loc->elf_ex.e_entry += load_bias; elf_bss += load_bias; elf_brk += load_bias; start_code += load_bias; end_code += load_bias; start_data += load_bias; end_data += load_bias; /* Calling set_brk effectively mmaps the pages that we need * for the bss and break sections. We must do this before * mapping in the interpreter, to make sure it doesn't wind * up getting placed where the bss needs to go. */ retval = set_brk(elf_bss, elf_brk); |
19d860a14 handle suicide on... |
952 |
if (retval) |
1da177e4c Linux-2.6.12-rc2 |
953 |
goto out_free_dentry; |
6de505173 [PATCH] binfmt_el... |
954 |
if (likely(elf_bss != elf_brk) && unlikely(padzero(elf_bss))) { |
1da177e4c Linux-2.6.12-rc2 |
955 956 957 958 959 |
retval = -EFAULT; /* Nobody gets to see this, but.. */ goto out_free_dentry; } if (elf_interpreter) { |
6eec482f4 binfmt_elf: Unini... |
960 |
unsigned long interp_map_addr = 0; |
d20894a23 Remove a.out inte... |
961 962 963 964 |
elf_entry = load_elf_interp(&loc->interp_elf_ex, interpreter, &interp_map_addr, |
a9d9ef133 binfmt_elf: load ... |
965 |
load_bias, interp_elf_phdata); |
d20894a23 Remove a.out inte... |
966 967 968 969 970 971 972 |
if (!IS_ERR((void *)elf_entry)) { /* * load_elf_interp() returns relocation * adjustment */ interp_load_addr = elf_entry; elf_entry += loc->interp_elf_ex.e_entry; |
cc503c1b4 x86: PIE executab... |
973 |
} |
1da177e4c Linux-2.6.12-rc2 |
974 |
if (BAD_ADDR(elf_entry)) { |
ce51059be [PATCH] binfmt_el... |
975 976 |
retval = IS_ERR((void *)elf_entry) ? (int)elf_entry : -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
977 978 979 980 981 982 983 984 985 |
goto out_free_dentry; } reloc_func_desc = interp_load_addr; allow_write_access(interpreter); fput(interpreter); kfree(elf_interpreter); } else { elf_entry = loc->elf_ex.e_entry; |
5342fba54 [PATCH] x86_64: C... |
986 |
if (BAD_ADDR(elf_entry)) { |
ce51059be [PATCH] binfmt_el... |
987 |
retval = -EINVAL; |
5342fba54 [PATCH] x86_64: C... |
988 989 |
goto out_free_dentry; } |
1da177e4c Linux-2.6.12-rc2 |
990 |
} |
774c105ed binfmt_elf: allow... |
991 |
kfree(interp_elf_phdata); |
1da177e4c Linux-2.6.12-rc2 |
992 |
kfree(elf_phdata); |
1da177e4c Linux-2.6.12-rc2 |
993 |
set_binfmt(&elf_format); |
547ee84ce [PATCH] ppc64: Im... |
994 |
#ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES |
fc5243d98 [S390] arch_setup... |
995 |
retval = arch_setup_additional_pages(bprm, !!elf_interpreter); |
19d860a14 handle suicide on... |
996 |
if (retval < 0) |
18c8baff8 [PATCH] Fix error... |
997 |
goto out; |
547ee84ce [PATCH] ppc64: Im... |
998 |
#endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */ |
a6f76f23d CRED: Make execve... |
999 |
install_exec_creds(bprm); |
b6a2fea39 mm: variable leng... |
1000 |
retval = create_elf_tables(bprm, &loc->elf_ex, |
f4e5cc2c4 [PATCH] binfmt_el... |
1001 |
load_addr, interp_load_addr); |
19d860a14 handle suicide on... |
1002 |
if (retval < 0) |
b6a2fea39 mm: variable leng... |
1003 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
1004 |
/* N.B. passed_fileno might not be initialized? */ |
1da177e4c Linux-2.6.12-rc2 |
1005 1006 1007 1008 1009 |
current->mm->end_code = end_code; current->mm->start_code = start_code; current->mm->start_data = start_data; current->mm->end_data = end_data; current->mm->start_stack = bprm->p; |
c1d171a00 x86: randomize brk |
1010 |
#ifdef arch_randomize_brk |
4471a675d brk: COMPAT_BRK: ... |
1011 |
if ((current->flags & PF_RANDOMIZE) && (randomize_va_space > 1)) { |
c1d171a00 x86: randomize brk |
1012 1013 |
current->mm->brk = current->mm->start_brk = arch_randomize_brk(current->mm); |
4471a675d brk: COMPAT_BRK: ... |
1014 1015 1016 1017 |
#ifdef CONFIG_COMPAT_BRK current->brk_randomized = 1; #endif } |
c1d171a00 x86: randomize brk |
1018 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
1019 1020 1021 1022 |
if (current->personality & MMAP_PAGE_ZERO) { /* Why this, you ask??? Well SVr4 maps page 0 as read-only, and some applications "depend" upon this behavior. Since we do not have the power to recompile these, we |
f4e5cc2c4 [PATCH] binfmt_el... |
1023 |
emulate the SVr4 behavior. Sigh. */ |
6be5ceb02 VM: add "vm_mmap(... |
1024 |
error = vm_mmap(NULL, 0, PAGE_SIZE, PROT_READ | PROT_EXEC, |
1da177e4c Linux-2.6.12-rc2 |
1025 |
MAP_FIXED | MAP_PRIVATE, 0); |
1da177e4c Linux-2.6.12-rc2 |
1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 |
} #ifdef ELF_PLAT_INIT /* * The ABI may specify that certain registers be set up in special * ways (on i386 %edx is the address of a DT_FINI function, for * example. In addition, it may also specify (eg, PowerPC64 ELF) * that the e_entry field is the address of the function descriptor * for the startup routine, rather than the address of the startup * routine itself. This macro performs whatever initialization to * the regs structure is required as well as any relocations to the * function descriptor entries when executing dynamically links apps. */ ELF_PLAT_INIT(regs, reloc_func_desc); #endif start_thread(regs, elf_entry, bprm->p); |
1da177e4c Linux-2.6.12-rc2 |
1043 1044 1045 1046 1047 1048 1049 1050 |
retval = 0; out: kfree(loc); out_ret: return retval; /* error cleanup */ out_free_dentry: |
a9d9ef133 binfmt_elf: load ... |
1051 |
kfree(interp_elf_phdata); |
1da177e4c Linux-2.6.12-rc2 |
1052 1053 1054 1055 |
allow_write_access(interpreter); if (interpreter) fput(interpreter); out_free_interp: |
f99d49adf [PATCH] kfree cle... |
1056 |
kfree(elf_interpreter); |
1da177e4c Linux-2.6.12-rc2 |
1057 1058 1059 1060 |
out_free_ph: kfree(elf_phdata); goto out; } |
69369a700 fs, kernel: permi... |
1061 |
#ifdef CONFIG_USELIB |
1da177e4c Linux-2.6.12-rc2 |
1062 1063 |
/* This is really simpleminded and specialized - we are loading an a.out library that is given an ELF header. */ |
1da177e4c Linux-2.6.12-rc2 |
1064 1065 1066 1067 1068 1069 1070 1071 1072 |
static int load_elf_library(struct file *file) { struct elf_phdr *elf_phdata; struct elf_phdr *eppnt; unsigned long elf_bss, bss, len; int retval, error, i, j; struct elfhdr elf_ex; error = -ENOEXEC; |
f4e5cc2c4 [PATCH] binfmt_el... |
1073 |
retval = kernel_read(file, 0, (char *)&elf_ex, sizeof(elf_ex)); |
1da177e4c Linux-2.6.12-rc2 |
1074 1075 1076 1077 1078 1079 1080 1081 |
if (retval != sizeof(elf_ex)) goto out; if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0) goto out; /* First of all, some simple consistency checks */ if (elf_ex.e_type != ET_EXEC || elf_ex.e_phnum > 2 || |
72c2d5319 file->f_op is nev... |
1082 |
!elf_check_arch(&elf_ex) || !file->f_op->mmap) |
1da177e4c Linux-2.6.12-rc2 |
1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 |
goto out; /* Now read in all of the header information */ j = sizeof(struct elf_phdr) * elf_ex.e_phnum; /* j < ELF_MIN_ALIGN because elf_ex.e_phnum <= 2 */ error = -ENOMEM; elf_phdata = kmalloc(j, GFP_KERNEL); if (!elf_phdata) goto out; eppnt = elf_phdata; error = -ENOEXEC; retval = kernel_read(file, elf_ex.e_phoff, (char *)eppnt, j); if (retval != j) goto out_free_ph; for (j = 0, i = 0; i<elf_ex.e_phnum; i++) if ((eppnt + i)->p_type == PT_LOAD) j++; if (j != 1) goto out_free_ph; while (eppnt->p_type != PT_LOAD) eppnt++; /* Now use mmap to map the library into memory. */ |
6be5ceb02 VM: add "vm_mmap(... |
1111 |
error = vm_mmap(file, |
1da177e4c Linux-2.6.12-rc2 |
1112 1113 1114 1115 1116 1117 1118 |
ELF_PAGESTART(eppnt->p_vaddr), (eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr)), PROT_READ | PROT_WRITE | PROT_EXEC, MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE, (eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr))); |
1da177e4c Linux-2.6.12-rc2 |
1119 1120 1121 1122 1123 1124 1125 1126 |
if (error != ELF_PAGESTART(eppnt->p_vaddr)) goto out_free_ph; elf_bss = eppnt->p_vaddr + eppnt->p_filesz; if (padzero(elf_bss)) { error = -EFAULT; goto out_free_ph; } |
f4e5cc2c4 [PATCH] binfmt_el... |
1127 1128 |
len = ELF_PAGESTART(eppnt->p_filesz + eppnt->p_vaddr + ELF_MIN_ALIGN - 1); |
1da177e4c Linux-2.6.12-rc2 |
1129 |
bss = eppnt->p_memsz + eppnt->p_vaddr; |
e4eb1ff61 VM: add "vm_brk()... |
1130 1131 |
if (bss > len) vm_brk(len, bss - len); |
1da177e4c Linux-2.6.12-rc2 |
1132 1133 1134 1135 1136 1137 1138 |
error = 0; out_free_ph: kfree(elf_phdata); out: return error; } |
69369a700 fs, kernel: permi... |
1139 |
#endif /* #ifdef CONFIG_USELIB */ |
1da177e4c Linux-2.6.12-rc2 |
1140 |
|
698ba7b5a elf: kill USE_ELF... |
1141 |
#ifdef CONFIG_ELF_CORE |
1da177e4c Linux-2.6.12-rc2 |
1142 1143 1144 1145 1146 1147 |
/* * ELF core dumper * * Modelled on fs/exec.c:aout_core_dump() * Jeremy Fitzhardinge <jeremy@sw.oz.au> */ |
1da177e4c Linux-2.6.12-rc2 |
1148 1149 |
/* |
909af768e coredump: remove ... |
1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 |
* The purpose of always_dump_vma() is to make sure that special kernel mappings * that are useful for post-mortem analysis are included in every core dump. * In that way we ensure that the core dump is fully interpretable later * without matching up the same kernel and hardware config to see what PC values * meant. These special mappings include - vDSO, vsyscall, and other * architecture specific mappings */ static bool always_dump_vma(struct vm_area_struct *vma) { /* Any vsyscall mappings? */ if (vma == get_gate_vma(vma->vm_mm)) return true; |
78d683e83 mm, fs: Add vm_op... |
1162 1163 1164 1165 1166 1167 1168 |
/* * Assume that all vmas with a .name op should always be dumped. * If this changes, a new vm_ops field can easily be added. */ if (vma->vm_ops && vma->vm_ops->name && vma->vm_ops->name(vma)) return true; |
909af768e coredump: remove ... |
1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 |
/* * arch_vma_name() returns non-NULL for special architecture mappings, * such as vDSO sections. */ if (arch_vma_name(vma)) return true; return false; } /* |
82df39738 Add MMF_DUMP_ELF_... |
1180 |
* Decide what to dump of a segment, part, all or none. |
1da177e4c Linux-2.6.12-rc2 |
1181 |
*/ |
82df39738 Add MMF_DUMP_ELF_... |
1182 1183 |
static unsigned long vma_dump_size(struct vm_area_struct *vma, unsigned long mm_flags) |
1da177e4c Linux-2.6.12-rc2 |
1184 |
{ |
e575f111d coredump_filter: ... |
1185 |
#define FILTER(type) (mm_flags & (1UL << MMF_DUMP_##type)) |
909af768e coredump: remove ... |
1186 1187 |
/* always dump the vdso and vsyscall sections */ if (always_dump_vma(vma)) |
82df39738 Add MMF_DUMP_ELF_... |
1188 |
goto whole; |
e5b97dde5 [PATCH] Add VM_AL... |
1189 |
|
0103bd16f mm: prepare VM_DO... |
1190 |
if (vma->vm_flags & VM_DONTDUMP) |
accb61fe7 coredump: add VM_... |
1191 |
return 0; |
e575f111d coredump_filter: ... |
1192 1193 1194 1195 1196 1197 |
/* Hugetlb memory check */ if (vma->vm_flags & VM_HUGETLB) { if ((vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_SHARED)) goto whole; if (!(vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_PRIVATE)) goto whole; |
23d9e4821 fs/binfmt_elf.c: ... |
1198 |
return 0; |
e575f111d coredump_filter: ... |
1199 |
} |
1da177e4c Linux-2.6.12-rc2 |
1200 |
/* Do not dump I/O mapped devices or special mappings */ |
314e51b98 mm: kill vma flag... |
1201 |
if (vma->vm_flags & VM_IO) |
1da177e4c Linux-2.6.12-rc2 |
1202 |
return 0; |
a1b59e802 coredump masking:... |
1203 1204 |
/* By default, dump shared memory if mapped from an anonymous file. */ if (vma->vm_flags & VM_SHARED) { |
496ad9aa8 new helper: file_... |
1205 |
if (file_inode(vma->vm_file)->i_nlink == 0 ? |
82df39738 Add MMF_DUMP_ELF_... |
1206 1207 1208 |
FILTER(ANON_SHARED) : FILTER(MAPPED_SHARED)) goto whole; return 0; |
a1b59e802 coredump masking:... |
1209 |
} |
1da177e4c Linux-2.6.12-rc2 |
1210 |
|
82df39738 Add MMF_DUMP_ELF_... |
1211 1212 1213 1214 1215 |
/* Dump segments that have been written to. */ if (vma->anon_vma && FILTER(ANON_PRIVATE)) goto whole; if (vma->vm_file == NULL) return 0; |
1da177e4c Linux-2.6.12-rc2 |
1216 |
|
82df39738 Add MMF_DUMP_ELF_... |
1217 1218 1219 1220 1221 1222 1223 1224 |
if (FILTER(MAPPED_PRIVATE)) goto whole; /* * If this looks like the beginning of a DSO or executable mapping, * check for an ELF header. If we find one, dump the first page to * aid in determining what was mapped here. */ |
92dc07b1f elf core dump: fi... |
1225 1226 |
if (FILTER(ELF_HEADERS) && vma->vm_pgoff == 0 && (vma->vm_flags & VM_READ)) { |
82df39738 Add MMF_DUMP_ELF_... |
1227 1228 |
u32 __user *header = (u32 __user *) vma->vm_start; u32 word; |
92dc07b1f elf core dump: fi... |
1229 |
mm_segment_t fs = get_fs(); |
82df39738 Add MMF_DUMP_ELF_... |
1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 |
/* * Doing it this way gets the constant folded by GCC. */ union { u32 cmp; char elfmag[SELFMAG]; } magic; BUILD_BUG_ON(SELFMAG != sizeof word); magic.elfmag[EI_MAG0] = ELFMAG0; magic.elfmag[EI_MAG1] = ELFMAG1; magic.elfmag[EI_MAG2] = ELFMAG2; magic.elfmag[EI_MAG3] = ELFMAG3; |
92dc07b1f elf core dump: fi... |
1242 1243 1244 1245 1246 1247 1248 1249 1250 |
/* * Switch to the user "segment" for get_user(), * then put back what elf_core_dump() had in place. */ set_fs(USER_DS); if (unlikely(get_user(word, header))) word = 0; set_fs(fs); if (word == magic.cmp) |
82df39738 Add MMF_DUMP_ELF_... |
1251 1252 1253 1254 1255 1256 1257 1258 1259 |
return PAGE_SIZE; } #undef FILTER return 0; whole: return vma->vm_end - vma->vm_start; |
1da177e4c Linux-2.6.12-rc2 |
1260 |
} |
1da177e4c Linux-2.6.12-rc2 |
1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 |
/* An ELF note in memory */ struct memelfnote { const char *name; int type; unsigned int datasz; void *data; }; static int notesize(struct memelfnote *en) { int sz; sz = sizeof(struct elf_note); sz += roundup(strlen(en->name) + 1, 4); sz += roundup(en->datasz, 4); return sz; } |
ecc8c7725 new helper: dump_... |
1280 |
static int writenote(struct memelfnote *men, struct coredump_params *cprm) |
d025c9db7 [PATCH] Support p... |
1281 1282 |
{ struct elf_note en; |
1da177e4c Linux-2.6.12-rc2 |
1283 1284 1285 |
en.n_namesz = strlen(men->name) + 1; en.n_descsz = men->datasz; en.n_type = men->type; |
ecc8c7725 new helper: dump_... |
1286 |
return dump_emit(cprm, &en, sizeof(en)) && |
22a8cb824 new helper: dump_... |
1287 1288 |
dump_emit(cprm, men->name, en.n_namesz) && dump_align(cprm, 4) && dump_emit(cprm, men->data, men->datasz) && dump_align(cprm, 4); |
1da177e4c Linux-2.6.12-rc2 |
1289 |
} |
1da177e4c Linux-2.6.12-rc2 |
1290 |
|
3aba481fc elf core dump: no... |
1291 |
static void fill_elf_header(struct elfhdr *elf, int segs, |
d3330cf08 binfmt_elf: remov... |
1292 |
u16 machine, u32 flags) |
1da177e4c Linux-2.6.12-rc2 |
1293 |
{ |
6970c8eff BINFMT: fill_elf_... |
1294 |
memset(elf, 0, sizeof(*elf)); |
1da177e4c Linux-2.6.12-rc2 |
1295 1296 1297 1298 1299 |
memcpy(elf->e_ident, ELFMAG, SELFMAG); elf->e_ident[EI_CLASS] = ELF_CLASS; elf->e_ident[EI_DATA] = ELF_DATA; elf->e_ident[EI_VERSION] = EV_CURRENT; elf->e_ident[EI_OSABI] = ELF_OSABI; |
1da177e4c Linux-2.6.12-rc2 |
1300 1301 |
elf->e_type = ET_CORE; |
3aba481fc elf core dump: no... |
1302 |
elf->e_machine = machine; |
1da177e4c Linux-2.6.12-rc2 |
1303 |
elf->e_version = EV_CURRENT; |
1da177e4c Linux-2.6.12-rc2 |
1304 |
elf->e_phoff = sizeof(struct elfhdr); |
3aba481fc elf core dump: no... |
1305 |
elf->e_flags = flags; |
1da177e4c Linux-2.6.12-rc2 |
1306 1307 1308 |
elf->e_ehsize = sizeof(struct elfhdr); elf->e_phentsize = sizeof(struct elf_phdr); elf->e_phnum = segs; |
6970c8eff BINFMT: fill_elf_... |
1309 |
|
1da177e4c Linux-2.6.12-rc2 |
1310 1311 |
return; } |
8d6b5eeea [PATCH] binfmt_el... |
1312 |
static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset) |
1da177e4c Linux-2.6.12-rc2 |
1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 |
{ phdr->p_type = PT_NOTE; phdr->p_offset = offset; phdr->p_vaddr = 0; phdr->p_paddr = 0; phdr->p_filesz = sz; phdr->p_memsz = 0; phdr->p_flags = 0; phdr->p_align = 0; return; } static void fill_note(struct memelfnote *note, const char *name, int type, unsigned int sz, void *data) { note->name = name; note->type = type; note->datasz = sz; note->data = data; return; } /* |
f4e5cc2c4 [PATCH] binfmt_el... |
1336 1337 |
* fill up all the fields in prstatus from the given task struct, except * registers which need to be filled up separately. |
1da177e4c Linux-2.6.12-rc2 |
1338 1339 |
*/ static void fill_prstatus(struct elf_prstatus *prstatus, |
f4e5cc2c4 [PATCH] binfmt_el... |
1340 |
struct task_struct *p, long signr) |
1da177e4c Linux-2.6.12-rc2 |
1341 1342 1343 1344 |
{ prstatus->pr_info.si_signo = prstatus->pr_cursig = signr; prstatus->pr_sigpend = p->pending.signal.sig[0]; prstatus->pr_sighold = p->blocked.sig[0]; |
3b34fc588 elf_core_dump: us... |
1345 1346 1347 |
rcu_read_lock(); prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); rcu_read_unlock(); |
b488893a3 pid namespaces: c... |
1348 |
prstatus->pr_pid = task_pid_vnr(p); |
b488893a3 pid namespaces: c... |
1349 1350 |
prstatus->pr_pgrp = task_pgrp_vnr(p); prstatus->pr_sid = task_session_vnr(p); |
1da177e4c Linux-2.6.12-rc2 |
1351 |
if (thread_group_leader(p)) { |
f06febc96 timers: fix itime... |
1352 |
struct task_cputime cputime; |
1da177e4c Linux-2.6.12-rc2 |
1353 |
/* |
f06febc96 timers: fix itime... |
1354 1355 |
* This is the record for the group leader. It shows the * group-wide total, not its individual thread total. |
1da177e4c Linux-2.6.12-rc2 |
1356 |
*/ |
f06febc96 timers: fix itime... |
1357 1358 1359 |
thread_group_cputime(p, &cputime); cputime_to_timeval(cputime.utime, &prstatus->pr_utime); cputime_to_timeval(cputime.stime, &prstatus->pr_stime); |
1da177e4c Linux-2.6.12-rc2 |
1360 |
} else { |
6fac4829c cputime: Use acce... |
1361 1362 1363 1364 1365 |
cputime_t utime, stime; task_cputime(p, &utime, &stime); cputime_to_timeval(utime, &prstatus->pr_utime); cputime_to_timeval(stime, &prstatus->pr_stime); |
1da177e4c Linux-2.6.12-rc2 |
1366 1367 1368 1369 1370 1371 1372 1373 |
} cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime); cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime); } static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p, struct mm_struct *mm) { |
c69e8d9c0 CRED: Use RCU to ... |
1374 |
const struct cred *cred; |
a84a50595 [PATCH] fix Linux... |
1375 |
unsigned int i, len; |
1da177e4c Linux-2.6.12-rc2 |
1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 |
/* first copy the parameters from user space */ memset(psinfo, 0, sizeof(struct elf_prpsinfo)); len = mm->arg_end - mm->arg_start; if (len >= ELF_PRARGSZ) len = ELF_PRARGSZ-1; if (copy_from_user(&psinfo->pr_psargs, (const char __user *)mm->arg_start, len)) return -EFAULT; for(i = 0; i < len; i++) if (psinfo->pr_psargs[i] == 0) psinfo->pr_psargs[i] = ' '; psinfo->pr_psargs[len] = 0; |
3b34fc588 elf_core_dump: us... |
1390 1391 1392 |
rcu_read_lock(); psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); rcu_read_unlock(); |
b488893a3 pid namespaces: c... |
1393 |
psinfo->pr_pid = task_pid_vnr(p); |
b488893a3 pid namespaces: c... |
1394 1395 |
psinfo->pr_pgrp = task_pgrp_vnr(p); psinfo->pr_sid = task_session_vnr(p); |
1da177e4c Linux-2.6.12-rc2 |
1396 1397 1398 |
i = p->state ? ffz(~p->state) + 1 : 0; psinfo->pr_state = i; |
551485481 [PATCH] remove ne... |
1399 |
psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i]; |
1da177e4c Linux-2.6.12-rc2 |
1400 1401 1402 |
psinfo->pr_zomb = psinfo->pr_sname == 'Z'; psinfo->pr_nice = task_nice(p); psinfo->pr_flag = p->flags; |
c69e8d9c0 CRED: Use RCU to ... |
1403 1404 |
rcu_read_lock(); cred = __task_cred(p); |
ebc887b27 userns: Convert b... |
1405 1406 |
SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid)); SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid)); |
c69e8d9c0 CRED: Use RCU to ... |
1407 |
rcu_read_unlock(); |
1da177e4c Linux-2.6.12-rc2 |
1408 1409 1410 1411 |
strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname)); return 0; } |
3aba481fc elf core dump: no... |
1412 1413 1414 1415 1416 1417 1418 1419 1420 |
static void fill_auxv_note(struct memelfnote *note, struct mm_struct *mm) { elf_addr_t *auxv = (elf_addr_t *) mm->saved_auxv; int i = 0; do i += 2; while (auxv[i - 2] != AT_NULL); fill_note(note, "CORE", NT_AUXV, i * sizeof(elf_addr_t), auxv); } |
49ae4d4b1 coredump: add a n... |
1421 |
static void fill_siginfo_note(struct memelfnote *note, user_siginfo_t *csigdata, |
ce3959604 constify copy_sig... |
1422 |
const siginfo_t *siginfo) |
49ae4d4b1 coredump: add a n... |
1423 1424 1425 1426 1427 1428 1429 |
{ mm_segment_t old_fs = get_fs(); set_fs(KERNEL_DS); copy_siginfo_to_user((user_siginfo_t __user *) csigdata, siginfo); set_fs(old_fs); fill_note(note, "CORE", NT_SIGINFO, sizeof(*csigdata), csigdata); } |
2aa362c49 coredump: extend ... |
1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 |
#define MAX_FILE_NOTE_SIZE (4*1024*1024) /* * Format of NT_FILE note: * * long count -- how many files are mapped * long page_size -- units for file_ofs * array of [COUNT] elements of * long start * long end * long file_ofs * followed by COUNT filenames in ASCII: "FILE1" NUL "FILE2" NUL... */ |
720236569 fs/binfmt_elf.c: ... |
1442 |
static int fill_files_note(struct memelfnote *note) |
2aa362c49 coredump: extend ... |
1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 |
{ struct vm_area_struct *vma; unsigned count, size, names_ofs, remaining, n; user_long_t *data; user_long_t *start_end_ofs; char *name_base, *name_curpos; /* *Estimated* file count and total data size needed */ count = current->mm->map_count; size = count * 64; names_ofs = (2 + 3 * count) * sizeof(data[0]); alloc: if (size >= MAX_FILE_NOTE_SIZE) /* paranoia check */ |
720236569 fs/binfmt_elf.c: ... |
1457 |
return -EINVAL; |
2aa362c49 coredump: extend ... |
1458 1459 1460 |
size = round_up(size, PAGE_SIZE); data = vmalloc(size); if (!data) |
720236569 fs/binfmt_elf.c: ... |
1461 |
return -ENOMEM; |
2aa362c49 coredump: extend ... |
1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 |
start_end_ofs = data + 2; name_base = name_curpos = ((char *)data) + names_ofs; remaining = size - names_ofs; count = 0; for (vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) { struct file *file; const char *filename; file = vma->vm_file; if (!file) continue; filename = d_path(&file->f_path, name_curpos, remaining); if (IS_ERR(filename)) { if (PTR_ERR(filename) == -ENAMETOOLONG) { vfree(data); size = size * 5 / 4; goto alloc; } continue; } /* d_path() fills at the end, move name down */ /* n = strlen(filename) + 1: */ n = (name_curpos + remaining) - filename; remaining = filename - name_curpos; memmove(name_curpos, filename, n); name_curpos += n; *start_end_ofs++ = vma->vm_start; *start_end_ofs++ = vma->vm_end; *start_end_ofs++ = vma->vm_pgoff; count++; } /* Now we know exact count of files, can store it */ data[0] = count; data[1] = PAGE_SIZE; /* * Count usually is less than current->mm->map_count, * we need to move filenames down. */ n = current->mm->map_count - count; if (n != 0) { unsigned shift_bytes = n * 3 * sizeof(data[0]); memmove(name_base - shift_bytes, name_base, name_curpos - name_base); name_curpos -= shift_bytes; } size = name_curpos - (char *)data; fill_note(note, "CORE", NT_FILE, size, data); |
720236569 fs/binfmt_elf.c: ... |
1514 |
return 0; |
2aa362c49 coredump: extend ... |
1515 |
} |
4206d3aa1 elf core dump: no... |
1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 |
#ifdef CORE_DUMP_USE_REGSET #include <linux/regset.h> struct elf_thread_core_info { struct elf_thread_core_info *next; struct task_struct *task; struct elf_prstatus prstatus; struct memelfnote notes[0]; }; struct elf_note_info { struct elf_thread_core_info *thread; struct memelfnote psinfo; |
49ae4d4b1 coredump: add a n... |
1529 |
struct memelfnote signote; |
4206d3aa1 elf core dump: no... |
1530 |
struct memelfnote auxv; |
2aa362c49 coredump: extend ... |
1531 |
struct memelfnote files; |
49ae4d4b1 coredump: add a n... |
1532 |
user_siginfo_t csigdata; |
4206d3aa1 elf core dump: no... |
1533 1534 1535 |
size_t size; int thread_notes; }; |
d31472b6d core dump: user_r... |
1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 |
/* * When a regset has a writeback hook, we call it on each thread before * dumping user memory. On register window machines, this makes sure the * user memory backing the register data is up to date before we read it. */ static void do_thread_regset_writeback(struct task_struct *task, const struct user_regset *regset) { if (regset->writeback) regset->writeback(task, regset, 1); } |
0953f65d5 elf: Allow core d... |
1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 |
#ifndef PR_REG_SIZE #define PR_REG_SIZE(S) sizeof(S) #endif #ifndef PRSTATUS_SIZE #define PRSTATUS_SIZE(S) sizeof(S) #endif #ifndef PR_REG_PTR #define PR_REG_PTR(S) (&((S)->pr_reg)) #endif #ifndef SET_PR_FPVALID #define SET_PR_FPVALID(S, V) ((S)->pr_fpvalid = (V)) #endif |
4206d3aa1 elf core dump: no... |
1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 |
static int fill_thread_core_info(struct elf_thread_core_info *t, const struct user_regset_view *view, long signr, size_t *total) { unsigned int i; /* * NT_PRSTATUS is the one special case, because the regset data * goes into the pr_reg field inside the note contents, rather * than being the whole note contents. We fill the reset in here. * We assume that regset 0 is NT_PRSTATUS. */ fill_prstatus(&t->prstatus, t->task, signr); (void) view->regsets[0].get(t->task, &view->regsets[0], |
0953f65d5 elf: Allow core d... |
1576 1577 |
0, PR_REG_SIZE(t->prstatus.pr_reg), PR_REG_PTR(&t->prstatus), NULL); |
4206d3aa1 elf core dump: no... |
1578 1579 |
fill_note(&t->notes[0], "CORE", NT_PRSTATUS, |
0953f65d5 elf: Allow core d... |
1580 |
PRSTATUS_SIZE(t->prstatus), &t->prstatus); |
4206d3aa1 elf core dump: no... |
1581 |
*total += notesize(&t->notes[0]); |
d31472b6d core dump: user_r... |
1582 |
do_thread_regset_writeback(t->task, &view->regsets[0]); |
4206d3aa1 elf core dump: no... |
1583 1584 1585 1586 1587 1588 1589 |
/* * Each other regset might generate a note too. For each regset * that has no core_note_type or is inactive, we leave t->notes[i] * all zero and we'll know to skip writing it later. */ for (i = 1; i < view->n; ++i) { const struct user_regset *regset = &view->regsets[i]; |
d31472b6d core dump: user_r... |
1590 |
do_thread_regset_writeback(t->task, regset); |
c8e252586 regset: Prevent n... |
1591 |
if (regset->core_note_type && regset->get && |
4206d3aa1 elf core dump: no... |
1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 |
(!regset->active || regset->active(t->task, regset))) { int ret; size_t size = regset->n * regset->size; void *data = kmalloc(size, GFP_KERNEL); if (unlikely(!data)) return 0; ret = regset->get(t->task, regset, 0, size, data, NULL); if (unlikely(ret)) kfree(data); else { if (regset->core_note_type != NT_PRFPREG) fill_note(&t->notes[i], "LINUX", regset->core_note_type, size, data); else { |
0953f65d5 elf: Allow core d... |
1608 |
SET_PR_FPVALID(&t->prstatus, 1); |
4206d3aa1 elf core dump: no... |
1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 |
fill_note(&t->notes[i], "CORE", NT_PRFPREG, size, data); } *total += notesize(&t->notes[i]); } } } return 1; } static int fill_note_info(struct elfhdr *elf, int phdrs, struct elf_note_info *info, |
ec57941e0 constify do_cored... |
1622 |
const siginfo_t *siginfo, struct pt_regs *regs) |
4206d3aa1 elf core dump: no... |
1623 1624 1625 1626 1627 |
{ struct task_struct *dump_task = current; const struct user_regset_view *view = task_user_regset_view(dump_task); struct elf_thread_core_info *t; struct elf_prpsinfo *psinfo; |
83914441f coredump: elf_cor... |
1628 |
struct core_thread *ct; |
4206d3aa1 elf core dump: no... |
1629 1630 1631 1632 1633 1634 |
unsigned int i; info->size = 0; info->thread = NULL; psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL); |
6899e92d6 binfmt_elf: fix c... |
1635 1636 |
if (psinfo == NULL) { info->psinfo.data = NULL; /* So we don't free this wrongly */ |
4206d3aa1 elf core dump: no... |
1637 |
return 0; |
6899e92d6 binfmt_elf: fix c... |
1638 |
} |
4206d3aa1 elf core dump: no... |
1639 |
|
e2dbe1255 elf: fix one chec... |
1640 |
fill_note(&info->psinfo, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo); |
4206d3aa1 elf core dump: no... |
1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 |
/* * Figure out how many notes we're going to need for each thread. */ info->thread_notes = 0; for (i = 0; i < view->n; ++i) if (view->regsets[i].core_note_type != 0) ++info->thread_notes; /* * Sanity check. We rely on regset 0 being in NT_PRSTATUS, * since it is our one special case. */ if (unlikely(info->thread_notes == 0) || unlikely(view->regsets[0].core_note_type != NT_PRSTATUS)) { WARN_ON(1); return 0; } /* * Initialize the ELF file header. */ fill_elf_header(elf, phdrs, |
d3330cf08 binfmt_elf: remov... |
1663 |
view->e_machine, view->e_flags); |
4206d3aa1 elf core dump: no... |
1664 1665 1666 1667 |
/* * Allocate a structure for each thread. */ |
83914441f coredump: elf_cor... |
1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 |
for (ct = &dump_task->mm->core_state->dumper; ct; ct = ct->next) { t = kzalloc(offsetof(struct elf_thread_core_info, notes[info->thread_notes]), GFP_KERNEL); if (unlikely(!t)) return 0; t->task = ct->task; if (ct->task == dump_task || !info->thread) { t->next = info->thread; info->thread = t; } else { /* * Make sure to keep the original task at * the head of the list. */ t->next = info->thread->next; info->thread->next = t; |
4206d3aa1 elf core dump: no... |
1686 |
} |
83914441f coredump: elf_cor... |
1687 |
} |
4206d3aa1 elf core dump: no... |
1688 1689 1690 1691 1692 |
/* * Now fill in each thread's information. */ for (t = info->thread; t != NULL; t = t->next) |
5ab1c309b coredump: pass si... |
1693 |
if (!fill_thread_core_info(t, view, siginfo->si_signo, &info->size)) |
4206d3aa1 elf core dump: no... |
1694 1695 1696 1697 1698 1699 1700 |
return 0; /* * Fill in the two process-wide notes. */ fill_psinfo(psinfo, dump_task->group_leader, dump_task->mm); info->size += notesize(&info->psinfo); |
49ae4d4b1 coredump: add a n... |
1701 1702 |
fill_siginfo_note(&info->signote, &info->csigdata, siginfo); info->size += notesize(&info->signote); |
4206d3aa1 elf core dump: no... |
1703 1704 |
fill_auxv_note(&info->auxv, current->mm); info->size += notesize(&info->auxv); |
720236569 fs/binfmt_elf.c: ... |
1705 1706 |
if (fill_files_note(&info->files) == 0) info->size += notesize(&info->files); |
2aa362c49 coredump: extend ... |
1707 |
|
4206d3aa1 elf core dump: no... |
1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 |
return 1; } static size_t get_note_info_size(struct elf_note_info *info) { return info->size; } /* * Write all the notes for each thread. When writing the first thread, the * process-wide notes are interleaved after the first thread-specific note. */ static int write_note_info(struct elf_note_info *info, |
ecc8c7725 new helper: dump_... |
1721 |
struct coredump_params *cprm) |
4206d3aa1 elf core dump: no... |
1722 |
{ |
b219e25f8 fs/binfmt_elf.c: ... |
1723 |
bool first = true; |
4206d3aa1 elf core dump: no... |
1724 1725 1726 1727 |
struct elf_thread_core_info *t = info->thread; do { int i; |
ecc8c7725 new helper: dump_... |
1728 |
if (!writenote(&t->notes[0], cprm)) |
4206d3aa1 elf core dump: no... |
1729 |
return 0; |
ecc8c7725 new helper: dump_... |
1730 |
if (first && !writenote(&info->psinfo, cprm)) |
4206d3aa1 elf core dump: no... |
1731 |
return 0; |
ecc8c7725 new helper: dump_... |
1732 |
if (first && !writenote(&info->signote, cprm)) |
49ae4d4b1 coredump: add a n... |
1733 |
return 0; |
ecc8c7725 new helper: dump_... |
1734 |
if (first && !writenote(&info->auxv, cprm)) |
4206d3aa1 elf core dump: no... |
1735 |
return 0; |
720236569 fs/binfmt_elf.c: ... |
1736 |
if (first && info->files.data && |
ecc8c7725 new helper: dump_... |
1737 |
!writenote(&info->files, cprm)) |
2aa362c49 coredump: extend ... |
1738 |
return 0; |
4206d3aa1 elf core dump: no... |
1739 1740 1741 |
for (i = 1; i < info->thread_notes; ++i) if (t->notes[i].data && |
ecc8c7725 new helper: dump_... |
1742 |
!writenote(&t->notes[i], cprm)) |
4206d3aa1 elf core dump: no... |
1743 |
return 0; |
b219e25f8 fs/binfmt_elf.c: ... |
1744 |
first = false; |
4206d3aa1 elf core dump: no... |
1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 |
t = t->next; } while (t); return 1; } static void free_note_info(struct elf_note_info *info) { struct elf_thread_core_info *threads = info->thread; while (threads) { unsigned int i; struct elf_thread_core_info *t = threads; threads = t->next; WARN_ON(t->notes[0].data && t->notes[0].data != &t->prstatus); for (i = 1; i < info->thread_notes; ++i) kfree(t->notes[i].data); kfree(t); } kfree(info->psinfo.data); |
2aa362c49 coredump: extend ... |
1764 |
vfree(info->files.data); |
4206d3aa1 elf core dump: no... |
1765 1766 1767 |
} #else |
1da177e4c Linux-2.6.12-rc2 |
1768 1769 1770 1771 1772 1773 1774 1775 |
/* Here is the structure in which status of each thread is captured. */ struct elf_thread_status { struct list_head list; struct elf_prstatus prstatus; /* NT_PRSTATUS */ elf_fpregset_t fpu; /* NT_PRFPREG */ struct task_struct *thread; #ifdef ELF_CORE_COPY_XFPREGS |
5b20cd80b x86: replace NT_P... |
1776 |
elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */ |
1da177e4c Linux-2.6.12-rc2 |
1777 1778 1779 1780 1781 1782 1783 |
#endif struct memelfnote notes[3]; int num_notes; }; /* * In order to add the specific thread information for the elf file format, |
f4e5cc2c4 [PATCH] binfmt_el... |
1784 1785 |
* we need to keep a linked list of every threads pr_status and then create * a single section for them in the final core file. |
1da177e4c Linux-2.6.12-rc2 |
1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 |
*/ static int elf_dump_thread_status(long signr, struct elf_thread_status *t) { int sz = 0; struct task_struct *p = t->thread; t->num_notes = 0; fill_prstatus(&t->prstatus, p, signr); elf_core_copy_task_regs(p, &t->prstatus.pr_reg); |
f4e5cc2c4 [PATCH] binfmt_el... |
1796 1797 |
fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), &(t->prstatus)); |
1da177e4c Linux-2.6.12-rc2 |
1798 1799 |
t->num_notes++; sz += notesize(&t->notes[0]); |
f4e5cc2c4 [PATCH] binfmt_el... |
1800 1801 1802 1803 |
if ((t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu))) { fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu), &(t->fpu)); |
1da177e4c Linux-2.6.12-rc2 |
1804 1805 1806 1807 1808 1809 |
t->num_notes++; sz += notesize(&t->notes[1]); } #ifdef ELF_CORE_COPY_XFPREGS if (elf_core_copy_task_xfpregs(p, &t->xfpu)) { |
5b20cd80b x86: replace NT_P... |
1810 1811 |
fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE, sizeof(t->xfpu), &t->xfpu); |
1da177e4c Linux-2.6.12-rc2 |
1812 1813 1814 1815 1816 1817 |
t->num_notes++; sz += notesize(&t->notes[2]); } #endif return sz; } |
3aba481fc elf core dump: no... |
1818 1819 |
struct elf_note_info { struct memelfnote *notes; |
720236569 fs/binfmt_elf.c: ... |
1820 |
struct memelfnote *notes_files; |
3aba481fc elf core dump: no... |
1821 1822 1823 1824 1825 1826 1827 |
struct elf_prstatus *prstatus; /* NT_PRSTATUS */ struct elf_prpsinfo *psinfo; /* NT_PRPSINFO */ struct list_head thread_list; elf_fpregset_t *fpu; #ifdef ELF_CORE_COPY_XFPREGS elf_fpxregset_t *xfpu; #endif |
49ae4d4b1 coredump: add a n... |
1828 |
user_siginfo_t csigdata; |
3aba481fc elf core dump: no... |
1829 1830 1831 |
int thread_status_size; int numnote; }; |
0cf062d0f elf: clean up fil... |
1832 |
static int elf_note_info_init(struct elf_note_info *info) |
3aba481fc elf core dump: no... |
1833 |
{ |
0cf062d0f elf: clean up fil... |
1834 |
memset(info, 0, sizeof(*info)); |
3aba481fc elf core dump: no... |
1835 |
INIT_LIST_HEAD(&info->thread_list); |
49ae4d4b1 coredump: add a n... |
1836 |
/* Allocate space for ELF notes */ |
2aa362c49 coredump: extend ... |
1837 |
info->notes = kmalloc(8 * sizeof(struct memelfnote), GFP_KERNEL); |
3aba481fc elf core dump: no... |
1838 1839 1840 1841 |
if (!info->notes) return 0; info->psinfo = kmalloc(sizeof(*info->psinfo), GFP_KERNEL); if (!info->psinfo) |
f34f9d186 coredump: prevent... |
1842 |
return 0; |
3aba481fc elf core dump: no... |
1843 1844 |
info->prstatus = kmalloc(sizeof(*info->prstatus), GFP_KERNEL); if (!info->prstatus) |
f34f9d186 coredump: prevent... |
1845 |
return 0; |
3aba481fc elf core dump: no... |
1846 1847 |
info->fpu = kmalloc(sizeof(*info->fpu), GFP_KERNEL); if (!info->fpu) |
f34f9d186 coredump: prevent... |
1848 |
return 0; |
3aba481fc elf core dump: no... |
1849 1850 1851 |
#ifdef ELF_CORE_COPY_XFPREGS info->xfpu = kmalloc(sizeof(*info->xfpu), GFP_KERNEL); if (!info->xfpu) |
f34f9d186 coredump: prevent... |
1852 |
return 0; |
3aba481fc elf core dump: no... |
1853 |
#endif |
0cf062d0f elf: clean up fil... |
1854 |
return 1; |
0cf062d0f elf: clean up fil... |
1855 1856 1857 1858 |
} static int fill_note_info(struct elfhdr *elf, int phdrs, struct elf_note_info *info, |
ec57941e0 constify do_cored... |
1859 |
const siginfo_t *siginfo, struct pt_regs *regs) |
0cf062d0f elf: clean up fil... |
1860 1861 |
{ struct list_head *t; |
afabada95 elf{,_fdpic} core... |
1862 1863 |
struct core_thread *ct; struct elf_thread_status *ets; |
0cf062d0f elf: clean up fil... |
1864 1865 1866 |
if (!elf_note_info_init(info)) return 0; |
3aba481fc elf core dump: no... |
1867 |
|
afabada95 elf{,_fdpic} core... |
1868 1869 1870 1871 1872 |
for (ct = current->mm->core_state->dumper.next; ct; ct = ct->next) { ets = kzalloc(sizeof(*ets), GFP_KERNEL); if (!ets) return 0; |
83914441f coredump: elf_cor... |
1873 |
|
afabada95 elf{,_fdpic} core... |
1874 1875 1876 |
ets->thread = ct->task; list_add(&ets->list, &info->thread_list); } |
83914441f coredump: elf_cor... |
1877 |
|
afabada95 elf{,_fdpic} core... |
1878 1879 |
list_for_each(t, &info->thread_list) { int sz; |
3aba481fc elf core dump: no... |
1880 |
|
afabada95 elf{,_fdpic} core... |
1881 1882 1883 |
ets = list_entry(t, struct elf_thread_status, list); sz = elf_dump_thread_status(siginfo->si_signo, ets); info->thread_status_size += sz; |
3aba481fc elf core dump: no... |
1884 1885 1886 |
} /* now collect the dump for the current */ memset(info->prstatus, 0, sizeof(*info->prstatus)); |
5ab1c309b coredump: pass si... |
1887 |
fill_prstatus(info->prstatus, current, siginfo->si_signo); |
3aba481fc elf core dump: no... |
1888 1889 1890 |
elf_core_copy_regs(&info->prstatus->pr_reg, regs); /* Set up header */ |
d3330cf08 binfmt_elf: remov... |
1891 |
fill_elf_header(elf, phdrs, ELF_ARCH, ELF_CORE_EFLAGS); |
3aba481fc elf core dump: no... |
1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 |
/* * Set up the notes in similar form to SVR4 core dumps made * with info from their /proc. */ fill_note(info->notes + 0, "CORE", NT_PRSTATUS, sizeof(*info->prstatus), info->prstatus); fill_psinfo(info->psinfo, current->group_leader, current->mm); fill_note(info->notes + 1, "CORE", NT_PRPSINFO, sizeof(*info->psinfo), info->psinfo); |
2aa362c49 coredump: extend ... |
1903 1904 |
fill_siginfo_note(info->notes + 2, &info->csigdata, siginfo); fill_auxv_note(info->notes + 3, current->mm); |
720236569 fs/binfmt_elf.c: ... |
1905 |
info->numnote = 4; |
3aba481fc elf core dump: no... |
1906 |
|
720236569 fs/binfmt_elf.c: ... |
1907 1908 1909 1910 |
if (fill_files_note(info->notes + info->numnote) == 0) { info->notes_files = info->notes + info->numnote; info->numnote++; } |
3aba481fc elf core dump: no... |
1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 |
/* Try to dump the FPU. */ info->prstatus->pr_fpvalid = elf_core_copy_task_fpregs(current, regs, info->fpu); if (info->prstatus->pr_fpvalid) fill_note(info->notes + info->numnote++, "CORE", NT_PRFPREG, sizeof(*info->fpu), info->fpu); #ifdef ELF_CORE_COPY_XFPREGS if (elf_core_copy_task_xfpregs(current, info->xfpu)) fill_note(info->notes + info->numnote++, "LINUX", ELF_CORE_XFPREG_TYPE, sizeof(*info->xfpu), info->xfpu); #endif return 1; |
3aba481fc elf core dump: no... |
1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 |
} static size_t get_note_info_size(struct elf_note_info *info) { int sz = 0; int i; for (i = 0; i < info->numnote; i++) sz += notesize(info->notes + i); sz += info->thread_status_size; return sz; } static int write_note_info(struct elf_note_info *info, |
ecc8c7725 new helper: dump_... |
1942 |
struct coredump_params *cprm) |
3aba481fc elf core dump: no... |
1943 1944 1945 1946 1947 |
{ int i; struct list_head *t; for (i = 0; i < info->numnote; i++) |
ecc8c7725 new helper: dump_... |
1948 |
if (!writenote(info->notes + i, cprm)) |
3aba481fc elf core dump: no... |
1949 1950 1951 1952 1953 1954 1955 1956 |
return 0; /* write out the thread status notes section */ list_for_each(t, &info->thread_list) { struct elf_thread_status *tmp = list_entry(t, struct elf_thread_status, list); for (i = 0; i < tmp->num_notes; i++) |
ecc8c7725 new helper: dump_... |
1957 |
if (!writenote(&tmp->notes[i], cprm)) |
3aba481fc elf core dump: no... |
1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 |
return 0; } return 1; } static void free_note_info(struct elf_note_info *info) { while (!list_empty(&info->thread_list)) { struct list_head *tmp = info->thread_list.next; list_del(tmp); kfree(list_entry(tmp, struct elf_thread_status, list)); } |
720236569 fs/binfmt_elf.c: ... |
1971 1972 1973 |
/* Free data possibly allocated by fill_files_note(): */ if (info->notes_files) vfree(info->notes_files->data); |
2aa362c49 coredump: extend ... |
1974 |
|
3aba481fc elf core dump: no... |
1975 1976 1977 1978 1979 1980 1981 1982 |
kfree(info->prstatus); kfree(info->psinfo); kfree(info->notes); kfree(info->fpu); #ifdef ELF_CORE_COPY_XFPREGS kfree(info->xfpu); #endif } |
4206d3aa1 elf core dump: no... |
1983 |
#endif |
f47aef55d [PATCH] i386 vDSO... |
1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 |
static struct vm_area_struct *first_vma(struct task_struct *tsk, struct vm_area_struct *gate_vma) { struct vm_area_struct *ret = tsk->mm->mmap; if (ret) return ret; return gate_vma; } /* * Helper function for iterating across a vma list. It ensures that the caller * will visit `gate_vma' prior to terminating the search. */ static struct vm_area_struct *next_vma(struct vm_area_struct *this_vma, struct vm_area_struct *gate_vma) { struct vm_area_struct *ret; ret = this_vma->vm_next; if (ret) return ret; if (this_vma == gate_vma) return NULL; return gate_vma; } |
8d9032bbe elf coredump: add... |
2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 |
static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum, elf_addr_t e_shoff, int segs) { elf->e_shoff = e_shoff; elf->e_shentsize = sizeof(*shdr4extnum); elf->e_shnum = 1; elf->e_shstrndx = SHN_UNDEF; memset(shdr4extnum, 0, sizeof(*shdr4extnum)); shdr4extnum->sh_type = SHT_NULL; shdr4extnum->sh_size = elf->e_shnum; shdr4extnum->sh_link = elf->e_shstrndx; shdr4extnum->sh_info = segs; } |
1da177e4c Linux-2.6.12-rc2 |
2024 2025 2026 2027 2028 2029 2030 |
/* * Actual dumper * * This is a two-pass process; first we find the offsets of the bits, * and then they are actually written out. If we run out of core limit * we just truncate. */ |
f6151dfea mm: introduce cor... |
2031 |
static int elf_core_dump(struct coredump_params *cprm) |
1da177e4c Linux-2.6.12-rc2 |
2032 |
{ |
1da177e4c Linux-2.6.12-rc2 |
2033 2034 |
int has_dumped = 0; mm_segment_t fs; |
52f5592e5 fs/binfmt_elf.c: ... |
2035 2036 |
int segs, i; size_t vma_data_size = 0; |
f47aef55d [PATCH] i386 vDSO... |
2037 |
struct vm_area_struct *vma, *gate_vma; |
1da177e4c Linux-2.6.12-rc2 |
2038 |
struct elfhdr *elf = NULL; |
cdc3d5627 switch elf_coredu... |
2039 |
loff_t offset = 0, dataoff; |
720236569 fs/binfmt_elf.c: ... |
2040 |
struct elf_note_info info = { }; |
93eb211e6 elf coredump: mak... |
2041 |
struct elf_phdr *phdr4note = NULL; |
8d9032bbe elf coredump: add... |
2042 2043 2044 |
struct elf_shdr *shdr4extnum = NULL; Elf_Half e_phnum; elf_addr_t e_shoff; |
52f5592e5 fs/binfmt_elf.c: ... |
2045 |
elf_addr_t *vma_filesz = NULL; |
1da177e4c Linux-2.6.12-rc2 |
2046 2047 2048 2049 |
/* * We no longer stop all VM operations. * |
f4e5cc2c4 [PATCH] binfmt_el... |
2050 2051 2052 |
* This is because those proceses that could possibly change map_count * or the mmap / vma pages are now blocked in do_exit on current * finishing this core dump. |
1da177e4c Linux-2.6.12-rc2 |
2053 2054 |
* * Only ptrace can touch these memory addresses, but it doesn't change |
f4e5cc2c4 [PATCH] binfmt_el... |
2055 |
* the map_count or the pages allocated. So no possibility of crashing |
1da177e4c Linux-2.6.12-rc2 |
2056 2057 2058 2059 2060 2061 |
* exists while dumping the mm->vm_next areas to the core file. */ /* alloc memory for large data structures: too large to be on stack */ elf = kmalloc(sizeof(*elf), GFP_KERNEL); if (!elf) |
5f719558e [Patch] fs/binfmt... |
2062 |
goto out; |
341c87bf3 elf: limit max ma... |
2063 2064 2065 2066 |
/* * The number of segs are recored into ELF header as 16bit value. * Please check DEFAULT_MAX_MAP_COUNT definition when you modify here. */ |
1da177e4c Linux-2.6.12-rc2 |
2067 |
segs = current->mm->map_count; |
1fcccbac8 elf coredump: rep... |
2068 |
segs += elf_core_extra_phdrs(); |
1da177e4c Linux-2.6.12-rc2 |
2069 |
|
31db58b3a mm: arch: make ge... |
2070 |
gate_vma = get_gate_vma(current->mm); |
f47aef55d [PATCH] i386 vDSO... |
2071 2072 |
if (gate_vma != NULL) segs++; |
8d9032bbe elf coredump: add... |
2073 2074 2075 2076 2077 2078 2079 |
/* for notes section */ segs++; /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid * this, kernel supports extended numbering. Have a look at * include/linux/elf.h for further information. */ e_phnum = segs > PN_XNUM ? PN_XNUM : segs; |
1da177e4c Linux-2.6.12-rc2 |
2080 |
/* |
3aba481fc elf core dump: no... |
2081 2082 |
* Collect all the non-memory information about the process for the * notes. This also sets up the file header. |
1da177e4c Linux-2.6.12-rc2 |
2083 |
*/ |
5ab1c309b coredump: pass si... |
2084 |
if (!fill_note_info(elf, e_phnum, &info, cprm->siginfo, cprm->regs)) |
3aba481fc elf core dump: no... |
2085 |
goto cleanup; |
1da177e4c Linux-2.6.12-rc2 |
2086 |
|
3aba481fc elf core dump: no... |
2087 |
has_dumped = 1; |
079148b91 coredump: factor ... |
2088 |
|
1da177e4c Linux-2.6.12-rc2 |
2089 2090 |
fs = get_fs(); set_fs(KERNEL_DS); |
1da177e4c Linux-2.6.12-rc2 |
2091 |
offset += sizeof(*elf); /* Elf header */ |
8d9032bbe elf coredump: add... |
2092 |
offset += segs * sizeof(struct elf_phdr); /* Program headers */ |
1da177e4c Linux-2.6.12-rc2 |
2093 2094 2095 |
/* Write notes phdr entry */ { |
3aba481fc elf core dump: no... |
2096 |
size_t sz = get_note_info_size(&info); |
1da177e4c Linux-2.6.12-rc2 |
2097 |
|
e55014923 [POWERPC] spufs: ... |
2098 |
sz += elf_coredump_extra_notes_size(); |
bf1ab978b [POWERPC] coredum... |
2099 |
|
93eb211e6 elf coredump: mak... |
2100 2101 |
phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL); if (!phdr4note) |
088e7af73 coredump: move du... |
2102 |
goto end_coredump; |
93eb211e6 elf coredump: mak... |
2103 2104 2105 |
fill_elf_note_phdr(phdr4note, sz, offset); offset += sz; |
1da177e4c Linux-2.6.12-rc2 |
2106 |
} |
1da177e4c Linux-2.6.12-rc2 |
2107 |
dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); |
52f5592e5 fs/binfmt_elf.c: ... |
2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 |
vma_filesz = kmalloc_array(segs - 1, sizeof(*vma_filesz), GFP_KERNEL); if (!vma_filesz) goto end_coredump; for (i = 0, vma = first_vma(current, gate_vma); vma != NULL; vma = next_vma(vma, gate_vma)) { unsigned long dump_size; dump_size = vma_dump_size(vma, cprm->mm_flags); vma_filesz[i++] = dump_size; vma_data_size += dump_size; } offset += vma_data_size; |
8d9032bbe elf coredump: add... |
2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 |
offset += elf_core_extra_data_size(); e_shoff = offset; if (e_phnum == PN_XNUM) { shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL); if (!shdr4extnum) goto end_coredump; fill_extnum_info(elf, shdr4extnum, e_shoff, segs); } offset = dataoff; |
ecc8c7725 new helper: dump_... |
2133 |
if (!dump_emit(cprm, elf, sizeof(*elf))) |
93eb211e6 elf coredump: mak... |
2134 |
goto end_coredump; |
ecc8c7725 new helper: dump_... |
2135 |
if (!dump_emit(cprm, phdr4note, sizeof(*phdr4note))) |
93eb211e6 elf coredump: mak... |
2136 |
goto end_coredump; |
1da177e4c Linux-2.6.12-rc2 |
2137 |
/* Write program headers for segments dump */ |
52f5592e5 fs/binfmt_elf.c: ... |
2138 |
for (i = 0, vma = first_vma(current, gate_vma); vma != NULL; |
f47aef55d [PATCH] i386 vDSO... |
2139 |
vma = next_vma(vma, gate_vma)) { |
1da177e4c Linux-2.6.12-rc2 |
2140 |
struct elf_phdr phdr; |
1da177e4c Linux-2.6.12-rc2 |
2141 2142 2143 2144 2145 |
phdr.p_type = PT_LOAD; phdr.p_offset = offset; phdr.p_vaddr = vma->vm_start; phdr.p_paddr = 0; |
52f5592e5 fs/binfmt_elf.c: ... |
2146 |
phdr.p_filesz = vma_filesz[i++]; |
82df39738 Add MMF_DUMP_ELF_... |
2147 |
phdr.p_memsz = vma->vm_end - vma->vm_start; |
1da177e4c Linux-2.6.12-rc2 |
2148 2149 |
offset += phdr.p_filesz; phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0; |
f4e5cc2c4 [PATCH] binfmt_el... |
2150 2151 2152 2153 |
if (vma->vm_flags & VM_WRITE) phdr.p_flags |= PF_W; if (vma->vm_flags & VM_EXEC) phdr.p_flags |= PF_X; |
1da177e4c Linux-2.6.12-rc2 |
2154 |
phdr.p_align = ELF_EXEC_PAGESIZE; |
ecc8c7725 new helper: dump_... |
2155 |
if (!dump_emit(cprm, &phdr, sizeof(phdr))) |
088e7af73 coredump: move du... |
2156 |
goto end_coredump; |
1da177e4c Linux-2.6.12-rc2 |
2157 |
} |
506f21c55 switch elf_core_w... |
2158 |
if (!elf_core_write_extra_phdrs(cprm, offset)) |
1fcccbac8 elf coredump: rep... |
2159 |
goto end_coredump; |
1da177e4c Linux-2.6.12-rc2 |
2160 2161 |
/* write out the notes section */ |
ecc8c7725 new helper: dump_... |
2162 |
if (!write_note_info(&info, cprm)) |
3aba481fc elf core dump: no... |
2163 |
goto end_coredump; |
1da177e4c Linux-2.6.12-rc2 |
2164 |
|
cdc3d5627 switch elf_coredu... |
2165 |
if (elf_coredump_extra_notes_write(cprm)) |
e55014923 [POWERPC] spufs: ... |
2166 |
goto end_coredump; |
bf1ab978b [POWERPC] coredum... |
2167 |
|
d025c9db7 [PATCH] Support p... |
2168 |
/* Align to page */ |
9b56d5438 dump_skip(): dump... |
2169 |
if (!dump_skip(cprm, dataoff - cprm->written)) |
f3e8fccd0 mm: add get_dump_... |
2170 |
goto end_coredump; |
1da177e4c Linux-2.6.12-rc2 |
2171 |
|
52f5592e5 fs/binfmt_elf.c: ... |
2172 |
for (i = 0, vma = first_vma(current, gate_vma); vma != NULL; |
f47aef55d [PATCH] i386 vDSO... |
2173 |
vma = next_vma(vma, gate_vma)) { |
1da177e4c Linux-2.6.12-rc2 |
2174 |
unsigned long addr; |
82df39738 Add MMF_DUMP_ELF_... |
2175 |
unsigned long end; |
1da177e4c Linux-2.6.12-rc2 |
2176 |
|
52f5592e5 fs/binfmt_elf.c: ... |
2177 |
end = vma->vm_start + vma_filesz[i++]; |
1da177e4c Linux-2.6.12-rc2 |
2178 |
|
82df39738 Add MMF_DUMP_ELF_... |
2179 |
for (addr = vma->vm_start; addr < end; addr += PAGE_SIZE) { |
f4e5cc2c4 [PATCH] binfmt_el... |
2180 |
struct page *page; |
f3e8fccd0 mm: add get_dump_... |
2181 2182 2183 2184 2185 |
int stop; page = get_dump_page(addr); if (page) { void *kaddr = kmap(page); |
13046ece9 binfmt_elf: conve... |
2186 |
stop = !dump_emit(cprm, kaddr, PAGE_SIZE); |
f3e8fccd0 mm: add get_dump_... |
2187 |
kunmap(page); |
1da177e4c Linux-2.6.12-rc2 |
2188 |
page_cache_release(page); |
f3e8fccd0 mm: add get_dump_... |
2189 |
} else |
9b56d5438 dump_skip(): dump... |
2190 |
stop = !dump_skip(cprm, PAGE_SIZE); |
f3e8fccd0 mm: add get_dump_... |
2191 2192 |
if (stop) goto end_coredump; |
1da177e4c Linux-2.6.12-rc2 |
2193 2194 |
} } |
aa3e7eaf0 switch elf_core_w... |
2195 |
if (!elf_core_write_extra_data(cprm)) |
1fcccbac8 elf coredump: rep... |
2196 |
goto end_coredump; |
1da177e4c Linux-2.6.12-rc2 |
2197 |
|
8d9032bbe elf coredump: add... |
2198 |
if (e_phnum == PN_XNUM) { |
13046ece9 binfmt_elf: conve... |
2199 |
if (!dump_emit(cprm, shdr4extnum, sizeof(*shdr4extnum))) |
8d9032bbe elf coredump: add... |
2200 2201 |
goto end_coredump; } |
1da177e4c Linux-2.6.12-rc2 |
2202 2203 2204 2205 |
end_coredump: set_fs(fs); cleanup: |
3aba481fc elf core dump: no... |
2206 |
free_note_info(&info); |
8d9032bbe elf coredump: add... |
2207 |
kfree(shdr4extnum); |
52f5592e5 fs/binfmt_elf.c: ... |
2208 |
kfree(vma_filesz); |
93eb211e6 elf coredump: mak... |
2209 |
kfree(phdr4note); |
5f719558e [Patch] fs/binfmt... |
2210 2211 |
kfree(elf); out: |
1da177e4c Linux-2.6.12-rc2 |
2212 |
return has_dumped; |
1da177e4c Linux-2.6.12-rc2 |
2213 |
} |
698ba7b5a elf: kill USE_ELF... |
2214 |
#endif /* CONFIG_ELF_CORE */ |
1da177e4c Linux-2.6.12-rc2 |
2215 2216 2217 |
static int __init init_elf_binfmt(void) { |
8fc3dc5a3 __register_binfmt... |
2218 2219 |
register_binfmt(&elf_format); return 0; |
1da177e4c Linux-2.6.12-rc2 |
2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 |
} static void __exit exit_elf_binfmt(void) { /* Remove the COFF and ELF loaders. */ unregister_binfmt(&elf_format); } core_initcall(init_elf_binfmt); module_exit(exit_elf_binfmt); MODULE_LICENSE("GPL"); |