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fs/binfmt_elf.c
54 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> #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 <asm/uaccess.h> #include <asm/param.h> #include <asm/page.h> |
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static int load_elf_binary(struct linux_binprm *bprm, struct pt_regs *regs); static int load_elf_library(struct file *); |
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static unsigned long elf_map(struct file *, unsigned long, struct elf_phdr *, int, int, unsigned long); |
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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; down_write(¤t->mm->mmap_sem); addr = do_brk(start, end - start); up_write(¤t->mm->mmap_sem); 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, cred->uid); NEW_AUX_ENT(AT_EUID, cred->euid); NEW_AUX_ENT(AT_GID, cred->gid); NEW_AUX_ENT(AT_EGID, 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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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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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; down_write(¤t->mm->mmap_sem); /* * 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); map_addr = do_mmap(filep, addr, total_size, prot, type, off); if (!BAD_ADDR(map_addr)) do_munmap(current->mm, map_addr+size, total_size-size); } else map_addr = do_mmap(filep, addr, size, prot, type, off); |
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up_write(¤t->mm->mmap_sem); return(map_addr); } |
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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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/* 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 */ |
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static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex, |
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struct file *interpreter, unsigned long *interp_map_addr, unsigned long no_base) |
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{ struct elf_phdr *elf_phdata; 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; |
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unsigned long total_size; |
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int retval, i, size; /* 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; if (!interpreter->f_op || !interpreter->f_op->mmap) goto out; /* * If the size of this structure has changed, then punt, since * we will be doing the wrong thing. */ if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr)) goto out; if (interp_elf_ex->e_phnum < 1 || interp_elf_ex->e_phnum > 65536U / sizeof(struct elf_phdr)) goto out; /* Now read in all of the header information */ |
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size = sizeof(struct elf_phdr) * interp_elf_ex->e_phnum; if (size > ELF_MIN_ALIGN) goto out; |
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elf_phdata = kmalloc(size, GFP_KERNEL); |
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if (!elf_phdata) goto out; |
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retval = kernel_read(interpreter, interp_elf_ex->e_phoff, |
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(char *)elf_phdata, size); |
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error = -EIO; if (retval != size) { if (retval < 0) error = retval; goto out_close; } |
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total_size = total_mapping_size(elf_phdata, interp_elf_ex->e_phnum); if (!total_size) { error = -EINVAL; goto out_close; } |
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eppnt = elf_phdata; |
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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; |
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else if (no_base && interp_elf_ex->e_type == ET_DYN) load_addr = -vaddr; |
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map_addr = elf_map(interpreter, load_addr + vaddr, |
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eppnt, elf_prot, elf_type, total_size); |
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total_size = 0; if (!*interp_map_addr) *interp_map_addr = map_addr; |
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error = map_addr; if (BAD_ADDR(map_addr)) goto out_close; 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; |
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if (BAD_ADDR(k) || |
f4e5cc2c4 [PATCH] binfmt_el... |
453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 |
eppnt->p_filesz > eppnt->p_memsz || eppnt->p_memsz > TASK_SIZE || TASK_SIZE - eppnt->p_memsz < k) { error = -ENOMEM; goto out_close; } /* * 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 |
476 |
} |
752015d1b binfmt_elf: fix P... |
477 478 479 480 481 482 483 484 485 486 487 |
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; goto out_close; } |
1da177e4c Linux-2.6.12-rc2 |
488 |
|
752015d1b binfmt_elf: fix P... |
489 490 |
/* What we have mapped so far */ elf_bss = ELF_PAGESTART(elf_bss + ELF_MIN_ALIGN - 1); |
1da177e4c Linux-2.6.12-rc2 |
491 |
|
752015d1b binfmt_elf: fix P... |
492 |
/* Map the last of the bss segment */ |
1da177e4c Linux-2.6.12-rc2 |
493 494 495 496 497 498 |
down_write(¤t->mm->mmap_sem); error = do_brk(elf_bss, last_bss - elf_bss); up_write(¤t->mm->mmap_sem); if (BAD_ADDR(error)) goto out_close; } |
cc503c1b4 x86: PIE executab... |
499 |
error = load_addr; |
1da177e4c Linux-2.6.12-rc2 |
500 501 502 503 504 505 |
out_close: kfree(elf_phdata); out: return error; } |
1da177e4c Linux-2.6.12-rc2 |
506 507 508 509 510 511 |
/* * These are the functions used to load ELF style executables and shared * libraries. There is no binary dependent code anywhere else. */ #define INTERPRETER_NONE 0 |
1da177e4c Linux-2.6.12-rc2 |
512 |
#define INTERPRETER_ELF 2 |
913bd9060 [PATCH] x86_64: I... |
513 |
#ifndef STACK_RND_MASK |
d1cabd632 [PATCH] fix proce... |
514 |
#define STACK_RND_MASK (0x7ff >> (PAGE_SHIFT - 12)) /* 8MB of VA */ |
913bd9060 [PATCH] x86_64: I... |
515 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
516 517 518 519 |
static unsigned long randomize_stack_top(unsigned long stack_top) { unsigned int random_variable = 0; |
c16b63e09 [PATCH] i386/x86-... |
520 521 |
if ((current->flags & PF_RANDOMIZE) && !(current->personality & ADDR_NO_RANDOMIZE)) { |
913bd9060 [PATCH] x86_64: I... |
522 523 524 |
random_variable = get_random_int() & STACK_RND_MASK; random_variable <<= PAGE_SHIFT; } |
1da177e4c Linux-2.6.12-rc2 |
525 |
#ifdef CONFIG_STACK_GROWSUP |
913bd9060 [PATCH] x86_64: I... |
526 |
return PAGE_ALIGN(stack_top) + random_variable; |
1da177e4c Linux-2.6.12-rc2 |
527 |
#else |
913bd9060 [PATCH] x86_64: I... |
528 |
return PAGE_ALIGN(stack_top) - random_variable; |
1da177e4c Linux-2.6.12-rc2 |
529 530 |
#endif } |
f4e5cc2c4 [PATCH] binfmt_el... |
531 |
static int load_elf_binary(struct linux_binprm *bprm, struct pt_regs *regs) |
1da177e4c Linux-2.6.12-rc2 |
532 533 534 535 536 |
{ 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 |
537 |
unsigned long error; |
f4e5cc2c4 [PATCH] binfmt_el... |
538 |
struct elf_phdr *elf_ppnt, *elf_phdata; |
1da177e4c Linux-2.6.12-rc2 |
539 |
unsigned long elf_bss, elf_brk; |
1da177e4c Linux-2.6.12-rc2 |
540 541 |
int retval, i; unsigned int size; |
cc503c1b4 x86: PIE executab... |
542 543 |
unsigned long elf_entry; unsigned long interp_load_addr = 0; |
1da177e4c Linux-2.6.12-rc2 |
544 |
unsigned long start_code, end_code, start_data, end_data; |
1a530a6f2 binfmt_elf: quiet... |
545 |
unsigned long reloc_func_desc __maybe_unused = 0; |
8de61e69c [PATCH] fs: remov... |
546 |
int executable_stack = EXSTACK_DEFAULT; |
1da177e4c Linux-2.6.12-rc2 |
547 548 549 550 |
unsigned long def_flags = 0; struct { struct elfhdr elf_ex; struct elfhdr interp_elf_ex; |
1da177e4c Linux-2.6.12-rc2 |
551 552 553 554 555 556 557 558 559 |
} *loc; loc = kmalloc(sizeof(*loc), GFP_KERNEL); if (!loc) { retval = -ENOMEM; goto out_ret; } /* Get the exec-header */ |
f4e5cc2c4 [PATCH] binfmt_el... |
560 |
loc->elf_ex = *((struct elfhdr *)bprm->buf); |
1da177e4c Linux-2.6.12-rc2 |
561 562 563 564 565 566 567 568 569 570 |
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; |
f670d0ecd binfmt_elf: cleanups |
571 |
if (!bprm->file->f_op || !bprm->file->f_op->mmap) |
1da177e4c Linux-2.6.12-rc2 |
572 573 574 |
goto out; /* Now read in all of the header information */ |
1da177e4c Linux-2.6.12-rc2 |
575 576 577 578 579 580 581 |
if (loc->elf_ex.e_phentsize != sizeof(struct elf_phdr)) goto out; if (loc->elf_ex.e_phnum < 1 || loc->elf_ex.e_phnum > 65536U / sizeof(struct elf_phdr)) goto out; size = loc->elf_ex.e_phnum * sizeof(struct elf_phdr); retval = -ENOMEM; |
f4e5cc2c4 [PATCH] binfmt_el... |
582 |
elf_phdata = kmalloc(size, GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
583 584 |
if (!elf_phdata) goto out; |
f4e5cc2c4 [PATCH] binfmt_el... |
585 586 |
retval = kernel_read(bprm->file, loc->elf_ex.e_phoff, (char *)elf_phdata, size); |
1da177e4c Linux-2.6.12-rc2 |
587 588 589 590 591 |
if (retval != size) { if (retval >= 0) retval = -EIO; goto out_free_ph; } |
1da177e4c Linux-2.6.12-rc2 |
592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 |
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 |
607 608 609 |
retval = -ENOEXEC; if (elf_ppnt->p_filesz > PATH_MAX || elf_ppnt->p_filesz < 2) |
e7b9b550f Don't mess with d... |
610 |
goto out_free_ph; |
1da177e4c Linux-2.6.12-rc2 |
611 612 |
retval = -ENOMEM; |
792db3af3 [PATCH] fs/binfmt... |
613 |
elf_interpreter = kmalloc(elf_ppnt->p_filesz, |
f4e5cc2c4 [PATCH] binfmt_el... |
614 |
GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
615 |
if (!elf_interpreter) |
e7b9b550f Don't mess with d... |
616 |
goto out_free_ph; |
1da177e4c Linux-2.6.12-rc2 |
617 618 |
retval = kernel_read(bprm->file, elf_ppnt->p_offset, |
f4e5cc2c4 [PATCH] binfmt_el... |
619 620 |
elf_interpreter, elf_ppnt->p_filesz); |
1da177e4c Linux-2.6.12-rc2 |
621 622 623 624 625 626 627 628 629 |
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 |
630 631 632 633 |
interpreter = open_exec(elf_interpreter); retval = PTR_ERR(interpreter); if (IS_ERR(interpreter)) goto out_free_interp; |
1fb844961 [PATCH] core-dump... |
634 635 636 637 638 639 |
/* * If the binary is not readable then enforce * mm->dumpable = 0 regardless of the interpreter's * permissions. */ |
1b5d783c9 consolidate BINPR... |
640 |
would_dump(bprm, interpreter); |
1fb844961 [PATCH] core-dump... |
641 |
|
f4e5cc2c4 [PATCH] binfmt_el... |
642 643 |
retval = kernel_read(interpreter, 0, bprm->buf, BINPRM_BUF_SIZE); |
1da177e4c Linux-2.6.12-rc2 |
644 645 646 647 648 649 650 |
if (retval != BINPRM_BUF_SIZE) { if (retval >= 0) retval = -EIO; goto out_free_dentry; } /* Get the exec headers */ |
f4e5cc2c4 [PATCH] binfmt_el... |
651 |
loc->interp_elf_ex = *((struct elfhdr *)bprm->buf); |
1da177e4c Linux-2.6.12-rc2 |
652 653 654 655 656 657 658 659 660 661 662 663 664 665 |
break; } elf_ppnt++; } elf_ppnt = elf_phdata; for (i = 0; i < loc->elf_ex.e_phnum; i++, elf_ppnt++) if (elf_ppnt->p_type == PT_GNU_STACK) { if (elf_ppnt->p_flags & PF_X) executable_stack = EXSTACK_ENABLE_X; else executable_stack = EXSTACK_DISABLE_X; break; } |
1da177e4c Linux-2.6.12-rc2 |
666 667 668 |
/* Some simple consistency checks for the interpreter */ if (elf_interpreter) { |
1da177e4c Linux-2.6.12-rc2 |
669 |
retval = -ELIBBAD; |
d20894a23 Remove a.out inte... |
670 671 |
/* Not an ELF interpreter */ if (memcmp(loc->interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0) |
1da177e4c Linux-2.6.12-rc2 |
672 |
goto out_free_dentry; |
1da177e4c Linux-2.6.12-rc2 |
673 |
/* Verify the interpreter has a valid arch */ |
d20894a23 Remove a.out inte... |
674 |
if (!elf_check_arch(&loc->interp_elf_ex)) |
1da177e4c Linux-2.6.12-rc2 |
675 |
goto out_free_dentry; |
1da177e4c Linux-2.6.12-rc2 |
676 |
} |
1da177e4c Linux-2.6.12-rc2 |
677 678 679 680 |
/* 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 |
681 |
/* OK, This is the point of no return */ |
1da177e4c Linux-2.6.12-rc2 |
682 683 684 685 686 |
current->flags &= ~PF_FORKNOEXEC; current->mm->def_flags = def_flags; /* Do this immediately, since STACK_TOP as used in setup_arg_pages may depend on the personality. */ |
0b5926828 [PATCH] remove un... |
687 |
SET_PERSONALITY(loc->elf_ex); |
1da177e4c Linux-2.6.12-rc2 |
688 689 |
if (elf_read_implies_exec(loc->elf_ex, executable_stack)) current->personality |= READ_IMPLIES_EXEC; |
f4e5cc2c4 [PATCH] binfmt_el... |
690 |
if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space) |
1da177e4c Linux-2.6.12-rc2 |
691 |
current->flags |= PF_RANDOMIZE; |
221af7f87 Split 'flush_old_... |
692 693 |
setup_new_exec(bprm); |
1da177e4c Linux-2.6.12-rc2 |
694 695 696 |
/* 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 |
697 |
current->mm->free_area_cache = current->mm->mmap_base; |
1363c3cd8 [PATCH] Avoiding ... |
698 |
current->mm->cached_hole_size = 0; |
1da177e4c Linux-2.6.12-rc2 |
699 700 701 702 703 704 705 |
retval = setup_arg_pages(bprm, randomize_stack_top(STACK_TOP), executable_stack); if (retval < 0) { send_sig(SIGKILL, current, 0); goto out_free_dentry; } |
1da177e4c Linux-2.6.12-rc2 |
706 |
current->mm->start_stack = bprm->p; |
af901ca18 tree-wide: fix as... |
707 |
/* Now we do a little grungy work by mmapping the ELF image into |
cc503c1b4 x86: PIE executab... |
708 |
the correct location in memory. */ |
f4e5cc2c4 [PATCH] binfmt_el... |
709 710 |
for(i = 0, elf_ppnt = elf_phdata; i < loc->elf_ex.e_phnum; i++, elf_ppnt++) { |
1da177e4c Linux-2.6.12-rc2 |
711 712 713 714 715 716 717 718 719 720 721 722 |
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 |
723 724 |
retval = set_brk(elf_bss + load_bias, elf_brk + load_bias); |
1da177e4c Linux-2.6.12-rc2 |
725 726 727 728 729 730 731 732 733 734 735 736 737 |
if (retval) { send_sig(SIGKILL, current, 0); goto out_free_dentry; } 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... |
738 |
* file specifies odd protections. So |
1da177e4c Linux-2.6.12-rc2 |
739 740 741 742 743 |
* we don't check the return value */ } } } |
f4e5cc2c4 [PATCH] binfmt_el... |
744 745 746 747 748 749 |
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 |
750 |
|
f4e5cc2c4 [PATCH] binfmt_el... |
751 |
elf_flags = MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE; |
1da177e4c Linux-2.6.12-rc2 |
752 753 754 755 756 |
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... |
757 758 759 760 |
/* 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... |
761 |
#ifdef CONFIG_ARCH_BINFMT_ELF_RANDOMIZE_PIE |
a3defbe5c binfmt_elf: fix P... |
762 763 764 765 766 767 768 769 770 771 |
/* Memory randomization might have been switched off * in runtime via sysctl. * 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... |
772 |
#else |
90cb28e8f Revert "[PATCH] b... |
773 |
load_bias = ELF_PAGESTART(ELF_ET_DYN_BASE - vaddr); |
cc503c1b4 x86: PIE executab... |
774 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
775 |
} |
f4e5cc2c4 [PATCH] binfmt_el... |
776 |
error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt, |
bb1ad8205 x86: PIE executab... |
777 |
elf_prot, elf_flags, 0); |
1da177e4c Linux-2.6.12-rc2 |
778 779 |
if (BAD_ADDR(error)) { send_sig(SIGKILL, current, 0); |
b140f2510 Invalid return va... |
780 781 |
retval = IS_ERR((void *)error) ? PTR_ERR((void*)error) : -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
782 783 784 785 786 787 788 789 790 791 792 793 794 795 |
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... |
796 797 798 799 |
if (k < start_code) start_code = k; if (start_data < k) start_data = k; |
1da177e4c Linux-2.6.12-rc2 |
800 801 802 803 804 805 |
/* * 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... |
806 |
if (BAD_ADDR(k) || elf_ppnt->p_filesz > elf_ppnt->p_memsz || |
1da177e4c Linux-2.6.12-rc2 |
807 808 |
elf_ppnt->p_memsz > TASK_SIZE || TASK_SIZE - elf_ppnt->p_memsz < k) { |
f4e5cc2c4 [PATCH] binfmt_el... |
809 |
/* set_brk can never work. Avoid overflows. */ |
1da177e4c Linux-2.6.12-rc2 |
810 |
send_sig(SIGKILL, current, 0); |
b140f2510 Invalid return va... |
811 |
retval = -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 |
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); if (retval) { send_sig(SIGKILL, current, 0); goto out_free_dentry; } |
6de505173 [PATCH] binfmt_el... |
846 |
if (likely(elf_bss != elf_brk) && unlikely(padzero(elf_bss))) { |
1da177e4c Linux-2.6.12-rc2 |
847 848 849 850 851 852 |
send_sig(SIGSEGV, current, 0); retval = -EFAULT; /* Nobody gets to see this, but.. */ goto out_free_dentry; } if (elf_interpreter) { |
d20894a23 Remove a.out inte... |
853 854 855 856 857 858 859 860 861 862 863 864 865 |
unsigned long uninitialized_var(interp_map_addr); elf_entry = load_elf_interp(&loc->interp_elf_ex, interpreter, &interp_map_addr, load_bias); 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... |
866 |
} |
1da177e4c Linux-2.6.12-rc2 |
867 |
if (BAD_ADDR(elf_entry)) { |
1da177e4c Linux-2.6.12-rc2 |
868 |
force_sig(SIGSEGV, current); |
ce51059be [PATCH] binfmt_el... |
869 870 |
retval = IS_ERR((void *)elf_entry) ? (int)elf_entry : -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
871 872 873 874 875 876 877 878 879 |
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... |
880 |
if (BAD_ADDR(elf_entry)) { |
ce51059be [PATCH] binfmt_el... |
881 882 |
force_sig(SIGSEGV, current); retval = -EINVAL; |
5342fba54 [PATCH] x86_64: C... |
883 884 |
goto out_free_dentry; } |
1da177e4c Linux-2.6.12-rc2 |
885 886 887 |
} kfree(elf_phdata); |
1da177e4c Linux-2.6.12-rc2 |
888 |
set_binfmt(&elf_format); |
547ee84ce [PATCH] ppc64: Im... |
889 |
#ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES |
fc5243d98 [S390] arch_setup... |
890 |
retval = arch_setup_additional_pages(bprm, !!elf_interpreter); |
547ee84ce [PATCH] ppc64: Im... |
891 892 |
if (retval < 0) { send_sig(SIGKILL, current, 0); |
18c8baff8 [PATCH] Fix error... |
893 |
goto out; |
547ee84ce [PATCH] ppc64: Im... |
894 895 |
} #endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */ |
a6f76f23d CRED: Make execve... |
896 |
install_exec_creds(bprm); |
1da177e4c Linux-2.6.12-rc2 |
897 |
current->flags &= ~PF_FORKNOEXEC; |
b6a2fea39 mm: variable leng... |
898 |
retval = create_elf_tables(bprm, &loc->elf_ex, |
f4e5cc2c4 [PATCH] binfmt_el... |
899 |
load_addr, interp_load_addr); |
b6a2fea39 mm: variable leng... |
900 901 902 903 |
if (retval < 0) { send_sig(SIGKILL, current, 0); goto out; } |
1da177e4c Linux-2.6.12-rc2 |
904 |
/* N.B. passed_fileno might not be initialized? */ |
1da177e4c Linux-2.6.12-rc2 |
905 906 907 908 909 |
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 |
910 |
#ifdef arch_randomize_brk |
4471a675d brk: COMPAT_BRK: ... |
911 |
if ((current->flags & PF_RANDOMIZE) && (randomize_va_space > 1)) { |
c1d171a00 x86: randomize brk |
912 913 |
current->mm->brk = current->mm->start_brk = arch_randomize_brk(current->mm); |
4471a675d brk: COMPAT_BRK: ... |
914 915 916 917 |
#ifdef CONFIG_COMPAT_BRK current->brk_randomized = 1; #endif } |
c1d171a00 x86: randomize brk |
918 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
919 920 921 922 |
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... |
923 |
emulate the SVr4 behavior. Sigh. */ |
1da177e4c Linux-2.6.12-rc2 |
924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 |
down_write(¤t->mm->mmap_sem); error = do_mmap(NULL, 0, PAGE_SIZE, PROT_READ | PROT_EXEC, MAP_FIXED | MAP_PRIVATE, 0); up_write(¤t->mm->mmap_sem); } #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 |
945 946 947 948 949 950 951 952 953 954 955 956 |
retval = 0; out: kfree(loc); out_ret: return retval; /* error cleanup */ out_free_dentry: allow_write_access(interpreter); if (interpreter) fput(interpreter); out_free_interp: |
f99d49adf [PATCH] kfree cle... |
957 |
kfree(elf_interpreter); |
1da177e4c Linux-2.6.12-rc2 |
958 959 960 961 962 963 964 |
out_free_ph: kfree(elf_phdata); goto out; } /* 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 |
965 966 967 968 969 970 971 972 973 |
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... |
974 |
retval = kernel_read(file, 0, (char *)&elf_ex, sizeof(elf_ex)); |
1da177e4c Linux-2.6.12-rc2 |
975 976 977 978 979 980 981 982 |
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 || |
f4e5cc2c4 [PATCH] binfmt_el... |
983 |
!elf_check_arch(&elf_ex) || !file->f_op || !file->f_op->mmap) |
1da177e4c Linux-2.6.12-rc2 |
984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 |
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. */ down_write(¤t->mm->mmap_sem); error = do_mmap(file, 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))); up_write(¤t->mm->mmap_sem); 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... |
1030 1031 |
len = ELF_PAGESTART(eppnt->p_filesz + eppnt->p_vaddr + ELF_MIN_ALIGN - 1); |
1da177e4c Linux-2.6.12-rc2 |
1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 |
bss = eppnt->p_memsz + eppnt->p_vaddr; if (bss > len) { down_write(¤t->mm->mmap_sem); do_brk(len, bss - len); up_write(¤t->mm->mmap_sem); } error = 0; out_free_ph: kfree(elf_phdata); out: return error; } |
698ba7b5a elf: kill USE_ELF... |
1045 |
#ifdef CONFIG_ELF_CORE |
1da177e4c Linux-2.6.12-rc2 |
1046 1047 1048 1049 1050 1051 |
/* * ELF core dumper * * Modelled on fs/exec.c:aout_core_dump() * Jeremy Fitzhardinge <jeremy@sw.oz.au> */ |
1da177e4c Linux-2.6.12-rc2 |
1052 1053 |
/* |
82df39738 Add MMF_DUMP_ELF_... |
1054 |
* Decide what to dump of a segment, part, all or none. |
1da177e4c Linux-2.6.12-rc2 |
1055 |
*/ |
82df39738 Add MMF_DUMP_ELF_... |
1056 1057 |
static unsigned long vma_dump_size(struct vm_area_struct *vma, unsigned long mm_flags) |
1da177e4c Linux-2.6.12-rc2 |
1058 |
{ |
e575f111d coredump_filter: ... |
1059 |
#define FILTER(type) (mm_flags & (1UL << MMF_DUMP_##type)) |
e5b97dde5 [PATCH] Add VM_AL... |
1060 1061 |
/* The vma can be set up to tell us the answer directly. */ if (vma->vm_flags & VM_ALWAYSDUMP) |
82df39738 Add MMF_DUMP_ELF_... |
1062 |
goto whole; |
e5b97dde5 [PATCH] Add VM_AL... |
1063 |
|
e575f111d coredump_filter: ... |
1064 1065 1066 1067 1068 1069 1070 |
/* 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; } |
1da177e4c Linux-2.6.12-rc2 |
1071 1072 1073 |
/* Do not dump I/O mapped devices or special mappings */ if (vma->vm_flags & (VM_IO | VM_RESERVED)) return 0; |
a1b59e802 coredump masking:... |
1074 1075 |
/* By default, dump shared memory if mapped from an anonymous file. */ if (vma->vm_flags & VM_SHARED) { |
82df39738 Add MMF_DUMP_ELF_... |
1076 1077 1078 1079 |
if (vma->vm_file->f_path.dentry->d_inode->i_nlink == 0 ? FILTER(ANON_SHARED) : FILTER(MAPPED_SHARED)) goto whole; return 0; |
a1b59e802 coredump masking:... |
1080 |
} |
1da177e4c Linux-2.6.12-rc2 |
1081 |
|
82df39738 Add MMF_DUMP_ELF_... |
1082 1083 1084 1085 1086 |
/* 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 |
1087 |
|
82df39738 Add MMF_DUMP_ELF_... |
1088 1089 1090 1091 1092 1093 1094 1095 |
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... |
1096 1097 |
if (FILTER(ELF_HEADERS) && vma->vm_pgoff == 0 && (vma->vm_flags & VM_READ)) { |
82df39738 Add MMF_DUMP_ELF_... |
1098 1099 |
u32 __user *header = (u32 __user *) vma->vm_start; u32 word; |
92dc07b1f elf core dump: fi... |
1100 |
mm_segment_t fs = get_fs(); |
82df39738 Add MMF_DUMP_ELF_... |
1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 |
/* * 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... |
1113 1114 1115 1116 1117 1118 1119 1120 1121 |
/* * 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_... |
1122 1123 1124 1125 1126 1127 1128 1129 1130 |
return PAGE_SIZE; } #undef FILTER return 0; whole: return vma->vm_end - vma->vm_start; |
1da177e4c Linux-2.6.12-rc2 |
1131 |
} |
1da177e4c Linux-2.6.12-rc2 |
1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 |
/* 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; } |
d025c9db7 [PATCH] Support p... |
1151 1152 |
#define DUMP_WRITE(addr, nr, foffset) \ do { if (!dump_write(file, (addr), (nr))) return 0; *foffset += (nr); } while(0) |
1da177e4c Linux-2.6.12-rc2 |
1153 |
|
d025c9db7 [PATCH] Support p... |
1154 |
static int alignfile(struct file *file, loff_t *foffset) |
1da177e4c Linux-2.6.12-rc2 |
1155 |
{ |
a7a0d86f5 [PATCH] Fix core ... |
1156 |
static const char buf[4] = { 0, }; |
d025c9db7 [PATCH] Support p... |
1157 1158 1159 |
DUMP_WRITE(buf, roundup(*foffset, 4) - *foffset, foffset); return 1; } |
1da177e4c Linux-2.6.12-rc2 |
1160 |
|
d025c9db7 [PATCH] Support p... |
1161 1162 1163 1164 |
static int writenote(struct memelfnote *men, struct file *file, loff_t *foffset) { struct elf_note en; |
1da177e4c Linux-2.6.12-rc2 |
1165 1166 1167 |
en.n_namesz = strlen(men->name) + 1; en.n_descsz = men->datasz; en.n_type = men->type; |
d025c9db7 [PATCH] Support p... |
1168 1169 1170 1171 1172 1173 1174 |
DUMP_WRITE(&en, sizeof(en), foffset); DUMP_WRITE(men->name, en.n_namesz, foffset); if (!alignfile(file, foffset)) return 0; DUMP_WRITE(men->data, men->datasz, foffset); if (!alignfile(file, foffset)) return 0; |
1da177e4c Linux-2.6.12-rc2 |
1175 1176 1177 1178 |
return 1; } #undef DUMP_WRITE |
1da177e4c Linux-2.6.12-rc2 |
1179 |
|
3aba481fc elf core dump: no... |
1180 1181 |
static void fill_elf_header(struct elfhdr *elf, int segs, u16 machine, u32 flags, u8 osabi) |
1da177e4c Linux-2.6.12-rc2 |
1182 |
{ |
6970c8eff BINFMT: fill_elf_... |
1183 |
memset(elf, 0, sizeof(*elf)); |
1da177e4c Linux-2.6.12-rc2 |
1184 1185 1186 1187 1188 |
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 |
1189 1190 |
elf->e_type = ET_CORE; |
3aba481fc elf core dump: no... |
1191 |
elf->e_machine = machine; |
1da177e4c Linux-2.6.12-rc2 |
1192 |
elf->e_version = EV_CURRENT; |
1da177e4c Linux-2.6.12-rc2 |
1193 |
elf->e_phoff = sizeof(struct elfhdr); |
3aba481fc elf core dump: no... |
1194 |
elf->e_flags = flags; |
1da177e4c Linux-2.6.12-rc2 |
1195 1196 1197 |
elf->e_ehsize = sizeof(struct elfhdr); elf->e_phentsize = sizeof(struct elf_phdr); elf->e_phnum = segs; |
6970c8eff BINFMT: fill_elf_... |
1198 |
|
1da177e4c Linux-2.6.12-rc2 |
1199 1200 |
return; } |
8d6b5eeea [PATCH] binfmt_el... |
1201 |
static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset) |
1da177e4c Linux-2.6.12-rc2 |
1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 |
{ 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... |
1225 1226 |
* 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 |
1227 1228 |
*/ static void fill_prstatus(struct elf_prstatus *prstatus, |
f4e5cc2c4 [PATCH] binfmt_el... |
1229 |
struct task_struct *p, long signr) |
1da177e4c Linux-2.6.12-rc2 |
1230 1231 1232 1233 |
{ 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... |
1234 1235 1236 |
rcu_read_lock(); prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); rcu_read_unlock(); |
b488893a3 pid namespaces: c... |
1237 |
prstatus->pr_pid = task_pid_vnr(p); |
b488893a3 pid namespaces: c... |
1238 1239 |
prstatus->pr_pgrp = task_pgrp_vnr(p); prstatus->pr_sid = task_session_vnr(p); |
1da177e4c Linux-2.6.12-rc2 |
1240 |
if (thread_group_leader(p)) { |
f06febc96 timers: fix itime... |
1241 |
struct task_cputime cputime; |
1da177e4c Linux-2.6.12-rc2 |
1242 |
/* |
f06febc96 timers: fix itime... |
1243 1244 |
* 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 |
1245 |
*/ |
f06febc96 timers: fix itime... |
1246 1247 1248 |
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 |
1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 |
} else { cputime_to_timeval(p->utime, &prstatus->pr_utime); cputime_to_timeval(p->stime, &prstatus->pr_stime); } 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 ... |
1260 |
const struct cred *cred; |
a84a50595 [PATCH] fix Linux... |
1261 |
unsigned int i, len; |
1da177e4c Linux-2.6.12-rc2 |
1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 |
/* 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... |
1276 1277 1278 |
rcu_read_lock(); psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); rcu_read_unlock(); |
b488893a3 pid namespaces: c... |
1279 |
psinfo->pr_pid = task_pid_vnr(p); |
b488893a3 pid namespaces: c... |
1280 1281 |
psinfo->pr_pgrp = task_pgrp_vnr(p); psinfo->pr_sid = task_session_vnr(p); |
1da177e4c Linux-2.6.12-rc2 |
1282 1283 1284 |
i = p->state ? ffz(~p->state) + 1 : 0; psinfo->pr_state = i; |
551485481 [PATCH] remove ne... |
1285 |
psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i]; |
1da177e4c Linux-2.6.12-rc2 |
1286 1287 1288 |
psinfo->pr_zomb = psinfo->pr_sname == 'Z'; psinfo->pr_nice = task_nice(p); psinfo->pr_flag = p->flags; |
c69e8d9c0 CRED: Use RCU to ... |
1289 1290 1291 1292 1293 |
rcu_read_lock(); cred = __task_cred(p); SET_UID(psinfo->pr_uid, cred->uid); SET_GID(psinfo->pr_gid, cred->gid); rcu_read_unlock(); |
1da177e4c Linux-2.6.12-rc2 |
1294 1295 1296 1297 |
strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname)); return 0; } |
3aba481fc elf core dump: no... |
1298 1299 1300 1301 1302 1303 1304 1305 1306 |
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); } |
4206d3aa1 elf core dump: no... |
1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 |
#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; struct memelfnote auxv; size_t size; int thread_notes; }; |
d31472b6d core dump: user_r... |
1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 |
/* * 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); } |
4206d3aa1 elf core dump: no... |
1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 |
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], 0, sizeof(t->prstatus.pr_reg), &t->prstatus.pr_reg, NULL); fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), &t->prstatus); *total += notesize(&t->notes[0]); |
d31472b6d core dump: user_r... |
1355 |
do_thread_regset_writeback(t->task, &view->regsets[0]); |
4206d3aa1 elf core dump: no... |
1356 1357 1358 1359 1360 1361 1362 |
/* * 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... |
1363 |
do_thread_regset_writeback(t->task, regset); |
4206d3aa1 elf core dump: no... |
1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 |
if (regset->core_note_type && (!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 { t->prstatus.pr_fpvalid = 1; 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, long signr, struct pt_regs *regs) { 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... |
1401 |
struct core_thread *ct; |
4206d3aa1 elf core dump: no... |
1402 1403 1404 1405 1406 1407 |
unsigned int i; info->size = 0; info->thread = NULL; psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL); |
4206d3aa1 elf core dump: no... |
1408 1409 |
if (psinfo == NULL) return 0; |
e2dbe1255 elf: fix one chec... |
1410 |
fill_note(&info->psinfo, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo); |
4206d3aa1 elf core dump: no... |
1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 |
/* * 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, view->e_machine, view->e_flags, view->ei_osabi); /* * Allocate a structure for each thread. */ |
83914441f coredump: elf_cor... |
1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 |
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... |
1456 |
} |
83914441f coredump: elf_cor... |
1457 |
} |
4206d3aa1 elf core dump: no... |
1458 1459 1460 1461 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 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 |
/* * Now fill in each thread's information. */ for (t = info->thread; t != NULL; t = t->next) if (!fill_thread_core_info(t, view, signr, &info->size)) return 0; /* * Fill in the two process-wide notes. */ fill_psinfo(psinfo, dump_task->group_leader, dump_task->mm); info->size += notesize(&info->psinfo); fill_auxv_note(&info->auxv, current->mm); info->size += notesize(&info->auxv); 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, struct file *file, loff_t *foffset) { bool first = 1; struct elf_thread_core_info *t = info->thread; do { int i; if (!writenote(&t->notes[0], file, foffset)) return 0; if (first && !writenote(&info->psinfo, file, foffset)) return 0; if (first && !writenote(&info->auxv, file, foffset)) return 0; for (i = 1; i < info->thread_notes; ++i) if (t->notes[i].data && !writenote(&t->notes[i], file, foffset)) return 0; first = 0; 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); } #else |
1da177e4c Linux-2.6.12-rc2 |
1532 1533 1534 1535 1536 1537 1538 1539 |
/* 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... |
1540 |
elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */ |
1da177e4c Linux-2.6.12-rc2 |
1541 1542 1543 1544 1545 1546 1547 |
#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... |
1548 1549 |
* 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 |
1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 |
*/ 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... |
1560 1561 |
fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), &(t->prstatus)); |
1da177e4c Linux-2.6.12-rc2 |
1562 1563 |
t->num_notes++; sz += notesize(&t->notes[0]); |
f4e5cc2c4 [PATCH] binfmt_el... |
1564 1565 1566 1567 |
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 |
1568 1569 1570 1571 1572 1573 |
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... |
1574 1575 |
fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE, sizeof(t->xfpu), &t->xfpu); |
1da177e4c Linux-2.6.12-rc2 |
1576 1577 1578 1579 1580 1581 |
t->num_notes++; sz += notesize(&t->notes[2]); } #endif return sz; } |
3aba481fc elf core dump: no... |
1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 |
struct elf_note_info { struct memelfnote *notes; 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 int thread_status_size; int numnote; }; |
0cf062d0f elf: clean up fil... |
1594 |
static int elf_note_info_init(struct elf_note_info *info) |
3aba481fc elf core dump: no... |
1595 |
{ |
0cf062d0f elf: clean up fil... |
1596 |
memset(info, 0, sizeof(*info)); |
3aba481fc elf core dump: no... |
1597 |
INIT_LIST_HEAD(&info->thread_list); |
0cf062d0f elf: clean up fil... |
1598 1599 |
/* Allocate space for six ELF notes */ info->notes = kmalloc(6 * sizeof(struct memelfnote), GFP_KERNEL); |
3aba481fc elf core dump: no... |
1600 1601 1602 1603 |
if (!info->notes) return 0; info->psinfo = kmalloc(sizeof(*info->psinfo), GFP_KERNEL); if (!info->psinfo) |
0cf062d0f elf: clean up fil... |
1604 |
goto notes_free; |
3aba481fc elf core dump: no... |
1605 1606 |
info->prstatus = kmalloc(sizeof(*info->prstatus), GFP_KERNEL); if (!info->prstatus) |
0cf062d0f elf: clean up fil... |
1607 |
goto psinfo_free; |
3aba481fc elf core dump: no... |
1608 1609 |
info->fpu = kmalloc(sizeof(*info->fpu), GFP_KERNEL); if (!info->fpu) |
0cf062d0f elf: clean up fil... |
1610 |
goto prstatus_free; |
3aba481fc elf core dump: no... |
1611 1612 1613 |
#ifdef ELF_CORE_COPY_XFPREGS info->xfpu = kmalloc(sizeof(*info->xfpu), GFP_KERNEL); if (!info->xfpu) |
0cf062d0f elf: clean up fil... |
1614 |
goto fpu_free; |
3aba481fc elf core dump: no... |
1615 |
#endif |
0cf062d0f elf: clean up fil... |
1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 |
return 1; #ifdef ELF_CORE_COPY_XFPREGS fpu_free: kfree(info->fpu); #endif prstatus_free: kfree(info->prstatus); psinfo_free: kfree(info->psinfo); notes_free: kfree(info->notes); return 0; } static int fill_note_info(struct elfhdr *elf, int phdrs, struct elf_note_info *info, long signr, struct pt_regs *regs) { struct list_head *t; if (!elf_note_info_init(info)) return 0; |
3aba481fc elf core dump: no... |
1638 |
|
3aba481fc elf core dump: no... |
1639 |
if (signr) { |
83914441f coredump: elf_cor... |
1640 |
struct core_thread *ct; |
4220b7fe8 elf: fix shadowed... |
1641 |
struct elf_thread_status *ets; |
83914441f coredump: elf_cor... |
1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 |
for (ct = current->mm->core_state->dumper.next; ct; ct = ct->next) { ets = kzalloc(sizeof(*ets), GFP_KERNEL); if (!ets) return 0; ets->thread = ct->task; list_add(&ets->list, &info->thread_list); } |
3aba481fc elf core dump: no... |
1652 |
list_for_each(t, &info->thread_list) { |
3aba481fc elf core dump: no... |
1653 |
int sz; |
4220b7fe8 elf: fix shadowed... |
1654 1655 |
ets = list_entry(t, struct elf_thread_status, list); sz = elf_dump_thread_status(signr, ets); |
3aba481fc elf core dump: no... |
1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 |
info->thread_status_size += sz; } } /* now collect the dump for the current */ memset(info->prstatus, 0, sizeof(*info->prstatus)); fill_prstatus(info->prstatus, current, signr); elf_core_copy_regs(&info->prstatus->pr_reg, regs); /* Set up header */ fill_elf_header(elf, phdrs, ELF_ARCH, ELF_CORE_EFLAGS, ELF_OSABI); /* * 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); info->numnote = 2; fill_auxv_note(&info->notes[info->numnote++], current->mm); /* 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... |
1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 |
} 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, struct file *file, loff_t *foffset) { int i; struct list_head *t; for (i = 0; i < info->numnote; i++) if (!writenote(info->notes + i, file, foffset)) 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++) if (!writenote(&tmp->notes[i], file, foffset)) 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)); } 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... |
1750 |
#endif |
f47aef55d [PATCH] i386 vDSO... |
1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 |
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... |
1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 |
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; } static size_t elf_core_vma_data_size(struct vm_area_struct *gate_vma, unsigned long mm_flags) { struct vm_area_struct *vma; size_t size = 0; for (vma = first_vma(current, gate_vma); vma != NULL; vma = next_vma(vma, gate_vma)) size += vma_dump_size(vma, mm_flags); return size; } |
1da177e4c Linux-2.6.12-rc2 |
1803 1804 1805 1806 1807 1808 1809 |
/* * 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... |
1810 |
static int elf_core_dump(struct coredump_params *cprm) |
1da177e4c Linux-2.6.12-rc2 |
1811 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1812 1813 1814 1815 |
int has_dumped = 0; mm_segment_t fs; int segs; size_t size = 0; |
f47aef55d [PATCH] i386 vDSO... |
1816 |
struct vm_area_struct *vma, *gate_vma; |
1da177e4c Linux-2.6.12-rc2 |
1817 |
struct elfhdr *elf = NULL; |
d025c9db7 [PATCH] Support p... |
1818 |
loff_t offset = 0, dataoff, foffset; |
3aba481fc elf core dump: no... |
1819 |
struct elf_note_info info; |
93eb211e6 elf coredump: mak... |
1820 |
struct elf_phdr *phdr4note = NULL; |
8d9032bbe elf coredump: add... |
1821 1822 1823 |
struct elf_shdr *shdr4extnum = NULL; Elf_Half e_phnum; elf_addr_t e_shoff; |
1da177e4c Linux-2.6.12-rc2 |
1824 1825 1826 1827 |
/* * We no longer stop all VM operations. * |
f4e5cc2c4 [PATCH] binfmt_el... |
1828 1829 1830 |
* 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 |
1831 1832 |
* * Only ptrace can touch these memory addresses, but it doesn't change |
f4e5cc2c4 [PATCH] binfmt_el... |
1833 |
* the map_count or the pages allocated. So no possibility of crashing |
1da177e4c Linux-2.6.12-rc2 |
1834 1835 1836 1837 1838 1839 |
* 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... |
1840 |
goto out; |
341c87bf3 elf: limit max ma... |
1841 1842 1843 1844 |
/* * 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 |
1845 |
segs = current->mm->map_count; |
1fcccbac8 elf coredump: rep... |
1846 |
segs += elf_core_extra_phdrs(); |
1da177e4c Linux-2.6.12-rc2 |
1847 |
|
31db58b3a mm: arch: make ge... |
1848 |
gate_vma = get_gate_vma(current->mm); |
f47aef55d [PATCH] i386 vDSO... |
1849 1850 |
if (gate_vma != NULL) segs++; |
8d9032bbe elf coredump: add... |
1851 1852 1853 1854 1855 1856 1857 |
/* 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 |
1858 |
/* |
3aba481fc elf core dump: no... |
1859 1860 |
* 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 |
1861 |
*/ |
8d9032bbe elf coredump: add... |
1862 |
if (!fill_note_info(elf, e_phnum, &info, cprm->signr, cprm->regs)) |
3aba481fc elf core dump: no... |
1863 |
goto cleanup; |
1da177e4c Linux-2.6.12-rc2 |
1864 |
|
3aba481fc elf core dump: no... |
1865 1866 |
has_dumped = 1; current->flags |= PF_DUMPCORE; |
1da177e4c Linux-2.6.12-rc2 |
1867 1868 1869 |
fs = get_fs(); set_fs(KERNEL_DS); |
1da177e4c Linux-2.6.12-rc2 |
1870 |
offset += sizeof(*elf); /* Elf header */ |
8d9032bbe elf coredump: add... |
1871 |
offset += segs * sizeof(struct elf_phdr); /* Program headers */ |
a7a0d86f5 [PATCH] Fix core ... |
1872 |
foffset = offset; |
1da177e4c Linux-2.6.12-rc2 |
1873 1874 1875 |
/* Write notes phdr entry */ { |
3aba481fc elf core dump: no... |
1876 |
size_t sz = get_note_info_size(&info); |
1da177e4c Linux-2.6.12-rc2 |
1877 |
|
e55014923 [POWERPC] spufs: ... |
1878 |
sz += elf_coredump_extra_notes_size(); |
bf1ab978b [POWERPC] coredum... |
1879 |
|
93eb211e6 elf coredump: mak... |
1880 1881 |
phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL); if (!phdr4note) |
088e7af73 coredump: move du... |
1882 |
goto end_coredump; |
93eb211e6 elf coredump: mak... |
1883 1884 1885 |
fill_elf_note_phdr(phdr4note, sz, offset); offset += sz; |
1da177e4c Linux-2.6.12-rc2 |
1886 |
} |
1da177e4c Linux-2.6.12-rc2 |
1887 |
dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); |
30736a4d4 coredump: pass mm... |
1888 |
offset += elf_core_vma_data_size(gate_vma, cprm->mm_flags); |
8d9032bbe elf coredump: add... |
1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 |
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; |
93eb211e6 elf coredump: mak... |
1900 1901 1902 1903 1904 1905 1906 1907 |
size += sizeof(*elf); if (size > cprm->limit || !dump_write(cprm->file, elf, sizeof(*elf))) goto end_coredump; size += sizeof(*phdr4note); if (size > cprm->limit || !dump_write(cprm->file, phdr4note, sizeof(*phdr4note))) goto end_coredump; |
1da177e4c Linux-2.6.12-rc2 |
1908 |
/* Write program headers for segments dump */ |
f47aef55d [PATCH] i386 vDSO... |
1909 1910 |
for (vma = first_vma(current, gate_vma); vma != NULL; vma = next_vma(vma, gate_vma)) { |
1da177e4c Linux-2.6.12-rc2 |
1911 |
struct elf_phdr phdr; |
1da177e4c Linux-2.6.12-rc2 |
1912 1913 1914 1915 1916 |
phdr.p_type = PT_LOAD; phdr.p_offset = offset; phdr.p_vaddr = vma->vm_start; phdr.p_paddr = 0; |
30736a4d4 coredump: pass mm... |
1917 |
phdr.p_filesz = vma_dump_size(vma, cprm->mm_flags); |
82df39738 Add MMF_DUMP_ELF_... |
1918 |
phdr.p_memsz = vma->vm_end - vma->vm_start; |
1da177e4c Linux-2.6.12-rc2 |
1919 1920 |
offset += phdr.p_filesz; phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0; |
f4e5cc2c4 [PATCH] binfmt_el... |
1921 1922 1923 1924 |
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 |
1925 |
phdr.p_align = ELF_EXEC_PAGESIZE; |
088e7af73 coredump: move du... |
1926 1927 1928 1929 |
size += sizeof(phdr); if (size > cprm->limit || !dump_write(cprm->file, &phdr, sizeof(phdr))) goto end_coredump; |
1da177e4c Linux-2.6.12-rc2 |
1930 |
} |
1fcccbac8 elf coredump: rep... |
1931 1932 |
if (!elf_core_write_extra_phdrs(cprm->file, offset, &size, cprm->limit)) goto end_coredump; |
1da177e4c Linux-2.6.12-rc2 |
1933 1934 |
/* write out the notes section */ |
f6151dfea mm: introduce cor... |
1935 |
if (!write_note_info(&info, cprm->file, &foffset)) |
3aba481fc elf core dump: no... |
1936 |
goto end_coredump; |
1da177e4c Linux-2.6.12-rc2 |
1937 |
|
f6151dfea mm: introduce cor... |
1938 |
if (elf_coredump_extra_notes_write(cprm->file, &foffset)) |
e55014923 [POWERPC] spufs: ... |
1939 |
goto end_coredump; |
bf1ab978b [POWERPC] coredum... |
1940 |
|
d025c9db7 [PATCH] Support p... |
1941 |
/* Align to page */ |
f6151dfea mm: introduce cor... |
1942 |
if (!dump_seek(cprm->file, dataoff - foffset)) |
f3e8fccd0 mm: add get_dump_... |
1943 |
goto end_coredump; |
1da177e4c Linux-2.6.12-rc2 |
1944 |
|
f47aef55d [PATCH] i386 vDSO... |
1945 1946 |
for (vma = first_vma(current, gate_vma); vma != NULL; vma = next_vma(vma, gate_vma)) { |
1da177e4c Linux-2.6.12-rc2 |
1947 |
unsigned long addr; |
82df39738 Add MMF_DUMP_ELF_... |
1948 |
unsigned long end; |
1da177e4c Linux-2.6.12-rc2 |
1949 |
|
30736a4d4 coredump: pass mm... |
1950 |
end = vma->vm_start + vma_dump_size(vma, cprm->mm_flags); |
1da177e4c Linux-2.6.12-rc2 |
1951 |
|
82df39738 Add MMF_DUMP_ELF_... |
1952 |
for (addr = vma->vm_start; addr < end; addr += PAGE_SIZE) { |
f4e5cc2c4 [PATCH] binfmt_el... |
1953 |
struct page *page; |
f3e8fccd0 mm: add get_dump_... |
1954 1955 1956 1957 1958 |
int stop; page = get_dump_page(addr); if (page) { void *kaddr = kmap(page); |
f6151dfea mm: introduce cor... |
1959 1960 1961 |
stop = ((size += PAGE_SIZE) > cprm->limit) || !dump_write(cprm->file, kaddr, PAGE_SIZE); |
f3e8fccd0 mm: add get_dump_... |
1962 |
kunmap(page); |
1da177e4c Linux-2.6.12-rc2 |
1963 |
page_cache_release(page); |
f3e8fccd0 mm: add get_dump_... |
1964 |
} else |
f6151dfea mm: introduce cor... |
1965 |
stop = !dump_seek(cprm->file, PAGE_SIZE); |
f3e8fccd0 mm: add get_dump_... |
1966 1967 |
if (stop) goto end_coredump; |
1da177e4c Linux-2.6.12-rc2 |
1968 1969 |
} } |
1fcccbac8 elf coredump: rep... |
1970 1971 |
if (!elf_core_write_extra_data(cprm->file, &size, cprm->limit)) goto end_coredump; |
1da177e4c Linux-2.6.12-rc2 |
1972 |
|
8d9032bbe elf coredump: add... |
1973 1974 1975 1976 1977 1978 1979 |
if (e_phnum == PN_XNUM) { size += sizeof(*shdr4extnum); if (size > cprm->limit || !dump_write(cprm->file, shdr4extnum, sizeof(*shdr4extnum))) goto end_coredump; } |
1da177e4c Linux-2.6.12-rc2 |
1980 1981 1982 1983 |
end_coredump: set_fs(fs); cleanup: |
3aba481fc elf core dump: no... |
1984 |
free_note_info(&info); |
8d9032bbe elf coredump: add... |
1985 |
kfree(shdr4extnum); |
93eb211e6 elf coredump: mak... |
1986 |
kfree(phdr4note); |
5f719558e [Patch] fs/binfmt... |
1987 1988 |
kfree(elf); out: |
1da177e4c Linux-2.6.12-rc2 |
1989 |
return has_dumped; |
1da177e4c Linux-2.6.12-rc2 |
1990 |
} |
698ba7b5a elf: kill USE_ELF... |
1991 |
#endif /* CONFIG_ELF_CORE */ |
1da177e4c Linux-2.6.12-rc2 |
1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 |
static int __init init_elf_binfmt(void) { return register_binfmt(&elf_format); } 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"); |