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fs/binfmt_elf.c
60.6 KB
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// SPDX-License-Identifier: GPL-2.0-only |
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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/log2.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> |
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#include <linux/hugetlb.h> |
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#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/elf-randomize.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 <linux/sched/coredump.h> |
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#include <linux/sched/task_stack.h> |
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#include <linux/sched/cputime.h> |
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#include <linux/sizes.h> #include <linux/types.h> |
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#include <linux/cred.h> |
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#include <linux/dax.h> |
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#include <linux/uaccess.h> |
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#include <asm/param.h> #include <asm/page.h> |
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#ifndef ELF_COMPAT #define ELF_COMPAT 0 #endif |
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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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/* That's for binfmt_elf_fdpic to deal with */ #ifndef elf_check_fdpic #define elf_check_fdpic(ex) false #endif |
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static int load_elf_binary(struct linux_binprm *bprm); |
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|
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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) (unlikely((unsigned long)(x) >= TASK_SIZE)) |
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|
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static int set_brk(unsigned long start, unsigned long end, int prot) |
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{ start = ELF_PAGEALIGN(start); end = ELF_PAGEALIGN(end); if (end > start) { |
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/* * Map the last of the bss segment. * If the header is requesting these pages to be * executable, honour that (ppc32 needs this). */ int error = vm_brk_flags(start, end - start, prot & PROT_EXEC ? VM_EXEC : 0); |
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if (error) return error; |
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} 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, const struct elfhdr *exec, |
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unsigned long interp_load_addr, unsigned long e_entry, unsigned long phdr_addr) |
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{ |
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struct mm_struct *mm = current->mm; |
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unsigned long p = bprm->p; int argc = bprm->argc; int envc = bprm->envc; |
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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; |
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elf_addr_t flags = 0; |
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int ei_index; |
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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); |
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if (copy_to_user(u_platform, k_platform, len)) |
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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); |
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if (copy_to_user(u_base_platform, k_base_platform, len)) |
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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)); |
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if (copy_to_user(u_rand_bytes, k_rand_bytes, sizeof(k_rand_bytes))) |
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return -EFAULT; |
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/* Create the ELF interpreter info */ |
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elf_info = (elf_addr_t *)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++ = id; \ *elf_info++ = 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); |
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NEW_AUX_ENT(AT_PHDR, phdr_addr); |
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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); |
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if (bprm->interp_flags & BINPRM_FLAGS_PRESERVE_ARGV0) flags |= AT_FLAGS_PRESERVE_ARGV0; NEW_AUX_ENT(AT_FLAGS, flags); |
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NEW_AUX_ENT(AT_ENTRY, 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, bprm->secureexec); |
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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->have_execfd) { NEW_AUX_ENT(AT_EXECFD, bprm->execfd); |
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} #undef NEW_AUX_ENT /* AT_NULL is zero; clear the rest too */ |
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memset(elf_info, 0, (char *)mm->saved_auxv + sizeof(mm->saved_auxv) - (char *)elf_info); |
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/* And advance past the AT_NULL entry. */ |
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elf_info += 2; |
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|
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ei_index = elf_info - (elf_addr_t *)mm->saved_auxv; |
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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. */ |
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if (mmap_read_lock_killable(mm)) return -EINTR; |
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vma = find_extend_vma(mm, bprm->p); |
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mmap_read_unlock(mm); |
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if (!vma) return -EFAULT; |
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/* Now, let's put argc (and argv, envp if appropriate) on the stack */ |
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if (put_user(argc, sp++)) |
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return -EFAULT; |
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|
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/* Populate list of argv pointers back to argv strings. */ |
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p = mm->arg_end = mm->arg_start; |
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while (argc-- > 0) { size_t len; |
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if (put_user((elf_addr_t)p, sp++)) |
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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; } |
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if (put_user(0, sp++)) |
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return -EFAULT; |
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mm->arg_end = p; |
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/* Populate list of envp pointers back to envp strings. */ |
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mm->env_end = mm->env_start = p; |
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while (envc-- > 0) { size_t len; |
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if (put_user((elf_addr_t)p, sp++)) |
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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; } |
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if (put_user(0, sp++)) |
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return -EFAULT; |
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mm->env_end = p; |
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/* Put the elf_info on the stack in the right place. */ |
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if (copy_to_user(sp, mm->saved_auxv, ei_index * sizeof(elf_addr_t))) |
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return -EFAULT; return 0; } |
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static unsigned long elf_map(struct file *filep, unsigned long addr, |
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const struct elf_phdr *eppnt, int prot, int type, |
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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); |
cc503c1b4 x86: PIE executab... |
370 |
if (!BAD_ADDR(map_addr)) |
5a5e4c2ec binfmt_elf: switc... |
371 |
vm_munmap(map_addr+size, total_size-size); |
cc503c1b4 x86: PIE executab... |
372 |
} else |
5a5e4c2ec binfmt_elf: switc... |
373 |
map_addr = vm_mmap(filep, addr, size, prot, type, off); |
cc503c1b4 x86: PIE executab... |
374 |
|
d23a61ee9 fs, elf: don't co... |
375 376 377 378 379 |
if ((type & MAP_FIXED_NOREPLACE) && PTR_ERR((void *)map_addr) == -EEXIST) pr_info("%d (%s): Uhuuh, elf segment at %px requested but the memory is mapped already ", task_pid_nr(current), current->comm, (void *)addr); |
4ed286395 fs, elf: drop MAP... |
380 |
|
1da177e4c Linux-2.6.12-rc2 |
381 382 |
return(map_addr); } |
49ac98196 fs/binfmt_elf.c: ... |
383 |
static unsigned long total_mapping_size(const struct elf_phdr *cmds, int nr) |
cc503c1b4 x86: PIE executab... |
384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 |
{ 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); } |
658c03356 fs/binfmt_elf.c: ... |
400 401 402 403 404 405 406 407 408 409 |
static int elf_read(struct file *file, void *buf, size_t len, loff_t pos) { ssize_t rv; rv = kernel_read(file, buf, len, &pos); if (unlikely(rv != len)) { return (rv < 0) ? rv : -EIO; } return 0; } |
ce81bb256 fs/binfmt_elf: us... |
410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 |
static unsigned long maximum_alignment(struct elf_phdr *cmds, int nr) { unsigned long alignment = 0; int i; for (i = 0; i < nr; i++) { if (cmds[i].p_type == PT_LOAD) { unsigned long p_align = cmds[i].p_align; /* skip non-power of two alignments as invalid */ if (!is_power_of_2(p_align)) continue; alignment = max(alignment, p_align); } } /* ensure we align to at least one page */ return ELF_PAGEALIGN(alignment); } |
6a8d38945 binfmt_elf: Hoist... |
429 430 431 432 433 434 435 436 437 |
/** * 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. */ |
49ac98196 fs/binfmt_elf.c: ... |
438 |
static struct elf_phdr *load_elf_phdrs(const struct elfhdr *elf_ex, |
6a8d38945 binfmt_elf: Hoist... |
439 440 441 |
struct file *elf_file) { struct elf_phdr *elf_phdata = NULL; |
faf1c3152 fs/binfmt_elf.c: ... |
442 |
int retval, err = -1; |
faf1c3152 fs/binfmt_elf.c: ... |
443 |
unsigned int size; |
6a8d38945 binfmt_elf: Hoist... |
444 445 446 447 448 449 450 451 452 |
/* * 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... */ |
6a8d38945 binfmt_elf: Hoist... |
453 454 |
/* ...and their total size. */ size = sizeof(struct elf_phdr) * elf_ex->e_phnum; |
faf1c3152 fs/binfmt_elf.c: ... |
455 |
if (size == 0 || size > 65536 || size > ELF_MIN_ALIGN) |
6a8d38945 binfmt_elf: Hoist... |
456 457 458 459 460 461 462 |
goto out; elf_phdata = kmalloc(size, GFP_KERNEL); if (!elf_phdata) goto out; /* Read in the program headers */ |
658c03356 fs/binfmt_elf.c: ... |
463 464 465 |
retval = elf_read(elf_file, elf_phdata, size, elf_ex->e_phoff); if (retval < 0) { err = retval; |
6a8d38945 binfmt_elf: Hoist... |
466 467 468 469 470 471 472 473 474 475 476 477 |
goto out; } /* Success! */ err = 0; out: if (err) { kfree(elf_phdata); elf_phdata = NULL; } return elf_phdata; } |
cc503c1b4 x86: PIE executab... |
478 |
|
774c105ed binfmt_elf: allow... |
479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 |
#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; } /** |
54d15714f binfmt_elf: Corre... |
525 |
* arch_check_elf() - check an ELF executable |
774c105ed binfmt_elf: allow... |
526 527 |
* @ehdr: The main ELF header * @has_interp: True if the ELF has an interpreter, else false. |
eb4bc076f ELF: Also pass an... |
528 |
* @interp_ehdr: The interpreter's ELF header |
774c105ed binfmt_elf: allow... |
529 530 531 532 533 534 535 536 537 538 539 |
* @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, |
eb4bc076f ELF: Also pass an... |
540 |
struct elfhdr *interp_ehdr, |
774c105ed binfmt_elf: allow... |
541 542 543 544 545 546 547 |
struct arch_elf_state *state) { /* Dummy implementation, always proceed */ return 0; } #endif /* !CONFIG_ARCH_BINFMT_ELF_STATE */ |
cc503c1b4 x86: PIE executab... |
548 |
|
fe0f67660 elf: Allow arch t... |
549 550 |
static inline int make_prot(u32 p_flags, struct arch_elf_state *arch_state, bool has_interp, bool is_interp) |
d8e7cb39a fs/binfmt_elf.c: ... |
551 552 553 554 555 556 557 558 559 |
{ int prot = 0; if (p_flags & PF_R) prot |= PROT_READ; if (p_flags & PF_W) prot |= PROT_WRITE; if (p_flags & PF_X) prot |= PROT_EXEC; |
fe0f67660 elf: Allow arch t... |
560 561 |
return arch_elf_adjust_prot(prot, arch_state, has_interp, is_interp); |
d8e7cb39a fs/binfmt_elf.c: ... |
562 |
} |
1da177e4c Linux-2.6.12-rc2 |
563 564 565 566 |
/* 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... |
567 |
static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex, |
81696d5d5 fs/binfmt_elf.c: ... |
568 |
struct file *interpreter, |
fe0f67660 elf: Allow arch t... |
569 570 |
unsigned long no_base, struct elf_phdr *interp_elf_phdata, struct arch_elf_state *arch_state) |
1da177e4c Linux-2.6.12-rc2 |
571 |
{ |
1da177e4c Linux-2.6.12-rc2 |
572 573 574 575 |
struct elf_phdr *eppnt; unsigned long load_addr = 0; int load_addr_set = 0; unsigned long last_bss = 0, elf_bss = 0; |
16e72e9b3 powerpc: do not m... |
576 |
int bss_prot = 0; |
1da177e4c Linux-2.6.12-rc2 |
577 |
unsigned long error = ~0UL; |
cc503c1b4 x86: PIE executab... |
578 |
unsigned long total_size; |
6a8d38945 binfmt_elf: Hoist... |
579 |
int i; |
1da177e4c Linux-2.6.12-rc2 |
580 581 582 583 584 |
/* First of all, some simple consistency checks */ if (interp_elf_ex->e_type != ET_EXEC && interp_elf_ex->e_type != ET_DYN) goto out; |
4755200b6 binfmt_elf: don't... |
585 586 |
if (!elf_check_arch(interp_elf_ex) || elf_check_fdpic(interp_elf_ex)) |
1da177e4c Linux-2.6.12-rc2 |
587 |
goto out; |
72c2d5319 file->f_op is nev... |
588 |
if (!interpreter->f_op->mmap) |
1da177e4c Linux-2.6.12-rc2 |
589 |
goto out; |
a9d9ef133 binfmt_elf: load ... |
590 591 |
total_size = total_mapping_size(interp_elf_phdata, interp_elf_ex->e_phnum); |
cc503c1b4 x86: PIE executab... |
592 593 |
if (!total_size) { error = -EINVAL; |
a9d9ef133 binfmt_elf: load ... |
594 |
goto out; |
cc503c1b4 x86: PIE executab... |
595 |
} |
a9d9ef133 binfmt_elf: load ... |
596 |
eppnt = interp_elf_phdata; |
f4e5cc2c4 [PATCH] binfmt_el... |
597 598 |
for (i = 0; i < interp_elf_ex->e_phnum; i++, eppnt++) { if (eppnt->p_type == PT_LOAD) { |
4589ff7ca binfmt: remove in... |
599 |
int elf_type = MAP_PRIVATE; |
fe0f67660 elf: Allow arch t... |
600 601 |
int elf_prot = make_prot(eppnt->p_flags, arch_state, true, true); |
f4e5cc2c4 [PATCH] binfmt_el... |
602 603 |
unsigned long vaddr = 0; unsigned long k, map_addr; |
f4e5cc2c4 [PATCH] binfmt_el... |
604 605 |
vaddr = eppnt->p_vaddr; if (interp_elf_ex->e_type == ET_EXEC || load_addr_set) |
9b2f72cc0 elf: don't use MA... |
606 |
elf_type |= MAP_FIXED; |
cc503c1b4 x86: PIE executab... |
607 608 |
else if (no_base && interp_elf_ex->e_type == ET_DYN) load_addr = -vaddr; |
f4e5cc2c4 [PATCH] binfmt_el... |
609 610 |
map_addr = elf_map(interpreter, load_addr + vaddr, |
bb1ad8205 x86: PIE executab... |
611 |
eppnt, elf_prot, elf_type, total_size); |
cc503c1b4 x86: PIE executab... |
612 |
total_size = 0; |
f4e5cc2c4 [PATCH] binfmt_el... |
613 614 |
error = map_addr; if (BAD_ADDR(map_addr)) |
a9d9ef133 binfmt_elf: load ... |
615 |
goto out; |
f4e5cc2c4 [PATCH] binfmt_el... |
616 617 618 619 620 621 622 623 624 625 626 627 628 |
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... |
629 |
if (BAD_ADDR(k) || |
f4e5cc2c4 [PATCH] binfmt_el... |
630 631 632 633 |
eppnt->p_filesz > eppnt->p_memsz || eppnt->p_memsz > TASK_SIZE || TASK_SIZE - eppnt->p_memsz < k) { error = -ENOMEM; |
a9d9ef133 binfmt_elf: load ... |
634 |
goto out; |
f4e5cc2c4 [PATCH] binfmt_el... |
635 636 637 638 639 640 641 642 643 644 645 646 647 648 |
} /* * 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. */ |
0036d1f7e binfmt_elf: fix c... |
649 |
k = load_addr + eppnt->p_vaddr + eppnt->p_memsz; |
16e72e9b3 powerpc: do not m... |
650 |
if (k > last_bss) { |
f4e5cc2c4 [PATCH] binfmt_el... |
651 |
last_bss = k; |
16e72e9b3 powerpc: do not m... |
652 653 |
bss_prot = elf_prot; } |
f4e5cc2c4 [PATCH] binfmt_el... |
654 |
} |
1da177e4c Linux-2.6.12-rc2 |
655 |
} |
0036d1f7e binfmt_elf: fix c... |
656 657 658 659 660 661 662 663 664 665 666 667 |
/* * Now fill out the bss section: first pad the last page from * the file up to the page boundary, and zero it from elf_bss * up to the end of the page. */ if (padzero(elf_bss)) { error = -EFAULT; goto out; } /* * Next, align both the file and mem bss up to the page size, * since this is where elf_bss was just zeroed up to, and where |
16e72e9b3 powerpc: do not m... |
668 |
* last_bss will end after the vm_brk_flags() below. |
0036d1f7e binfmt_elf: fix c... |
669 670 671 672 |
*/ elf_bss = ELF_PAGEALIGN(elf_bss); last_bss = ELF_PAGEALIGN(last_bss); /* Finally, if there is still more bss to allocate, do it. */ |
752015d1b binfmt_elf: fix P... |
673 |
if (last_bss > elf_bss) { |
16e72e9b3 powerpc: do not m... |
674 675 |
error = vm_brk_flags(elf_bss, last_bss - elf_bss, bss_prot & PROT_EXEC ? VM_EXEC : 0); |
5d22fc25d mm: remove more I... |
676 |
if (error) |
a9d9ef133 binfmt_elf: load ... |
677 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
678 |
} |
cc503c1b4 x86: PIE executab... |
679 |
error = load_addr; |
1da177e4c Linux-2.6.12-rc2 |
680 681 682 |
out: return error; } |
1da177e4c Linux-2.6.12-rc2 |
683 684 685 686 |
/* * These are the functions used to load ELF style executables and shared * libraries. There is no binary dependent code anywhere else. */ |
00e19ceec ELF: Add ELF prog... |
687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 |
static int parse_elf_property(const char *data, size_t *off, size_t datasz, struct arch_elf_state *arch, bool have_prev_type, u32 *prev_type) { size_t o, step; const struct gnu_property *pr; int ret; if (*off == datasz) return -ENOENT; if (WARN_ON_ONCE(*off > datasz || *off % ELF_GNU_PROPERTY_ALIGN)) return -EIO; o = *off; datasz -= *off; if (datasz < sizeof(*pr)) return -ENOEXEC; pr = (const struct gnu_property *)(data + o); o += sizeof(*pr); datasz -= sizeof(*pr); if (pr->pr_datasz > datasz) return -ENOEXEC; WARN_ON_ONCE(o % ELF_GNU_PROPERTY_ALIGN); step = round_up(pr->pr_datasz, ELF_GNU_PROPERTY_ALIGN); if (step > datasz) return -ENOEXEC; /* Properties are supposed to be unique and sorted on pr_type: */ if (have_prev_type && pr->pr_type <= *prev_type) return -ENOEXEC; *prev_type = pr->pr_type; ret = arch_parse_elf_property(pr->pr_type, data + o, pr->pr_datasz, ELF_COMPAT, arch); if (ret) return ret; *off = o + step; return 0; } #define NOTE_DATA_SZ SZ_1K #define GNU_PROPERTY_TYPE_0_NAME "GNU" #define NOTE_NAME_SZ (sizeof(GNU_PROPERTY_TYPE_0_NAME)) static int parse_elf_properties(struct file *f, const struct elf_phdr *phdr, struct arch_elf_state *arch) { union { struct elf_note nhdr; char data[NOTE_DATA_SZ]; } note; loff_t pos; ssize_t n; size_t off, datasz; int ret; bool have_prev_type; u32 prev_type; if (!IS_ENABLED(CONFIG_ARCH_USE_GNU_PROPERTY) || !phdr) return 0; /* load_elf_binary() shouldn't call us unless this is true... */ if (WARN_ON_ONCE(phdr->p_type != PT_GNU_PROPERTY)) return -ENOEXEC; /* If the properties are crazy large, that's too bad (for now): */ if (phdr->p_filesz > sizeof(note)) return -ENOEXEC; pos = phdr->p_offset; n = kernel_read(f, ¬e, phdr->p_filesz, &pos); BUILD_BUG_ON(sizeof(note) < sizeof(note.nhdr) + NOTE_NAME_SZ); if (n < 0 || n < sizeof(note.nhdr) + NOTE_NAME_SZ) return -EIO; if (note.nhdr.n_type != NT_GNU_PROPERTY_TYPE_0 || note.nhdr.n_namesz != NOTE_NAME_SZ || strncmp(note.data + sizeof(note.nhdr), GNU_PROPERTY_TYPE_0_NAME, n - sizeof(note.nhdr))) return -ENOEXEC; off = round_up(sizeof(note.nhdr) + NOTE_NAME_SZ, ELF_GNU_PROPERTY_ALIGN); if (off > n) return -ENOEXEC; if (note.nhdr.n_descsz > n - off) return -ENOEXEC; datasz = off + note.nhdr.n_descsz; have_prev_type = false; do { ret = parse_elf_property(note.data, &off, datasz, arch, have_prev_type, &prev_type); have_prev_type = true; } while (!ret); return ret == -ENOENT ? 0 : ret; } |
71613c3b8 get rid of pt_reg... |
791 |
static int load_elf_binary(struct linux_binprm *bprm) |
1da177e4c Linux-2.6.12-rc2 |
792 793 |
{ struct file *interpreter = NULL; /* to shut gcc up */ |
e0943c456 fs/binfmt_elf: Fi... |
794 |
unsigned long load_addr, load_bias = 0, phdr_addr = 0; |
1da177e4c Linux-2.6.12-rc2 |
795 |
int load_addr_set = 0; |
1da177e4c Linux-2.6.12-rc2 |
796 |
unsigned long error; |
a9d9ef133 binfmt_elf: load ... |
797 |
struct elf_phdr *elf_ppnt, *elf_phdata, *interp_elf_phdata = NULL; |
00e19ceec ELF: Add ELF prog... |
798 |
struct elf_phdr *elf_property_phdata = NULL; |
1da177e4c Linux-2.6.12-rc2 |
799 |
unsigned long elf_bss, elf_brk; |
16e72e9b3 powerpc: do not m... |
800 |
int bss_prot = 0; |
1da177e4c Linux-2.6.12-rc2 |
801 |
int retval, i; |
cc503c1b4 x86: PIE executab... |
802 |
unsigned long elf_entry; |
a62c5b1b6 fs/binfmt_elf.c: ... |
803 |
unsigned long e_entry; |
cc503c1b4 x86: PIE executab... |
804 |
unsigned long interp_load_addr = 0; |
1da177e4c Linux-2.6.12-rc2 |
805 |
unsigned long start_code, end_code, start_data, end_data; |
1a530a6f2 binfmt_elf: quiet... |
806 |
unsigned long reloc_func_desc __maybe_unused = 0; |
8de61e69c [PATCH] fs: remov... |
807 |
int executable_stack = EXSTACK_DEFAULT; |
a62c5b1b6 fs/binfmt_elf.c: ... |
808 |
struct elfhdr *elf_ex = (struct elfhdr *)bprm->buf; |
0693ffebc fs/binfmt_elf.c: ... |
809 |
struct elfhdr *interp_elf_ex = NULL; |
774c105ed binfmt_elf: allow... |
810 |
struct arch_elf_state arch_state = INIT_ARCH_ELF_STATE; |
03c6d723e fs/binfmt_elf.c: ... |
811 |
struct mm_struct *mm; |
249b08e4e elf: init pt_regs... |
812 |
struct pt_regs *regs; |
1da177e4c Linux-2.6.12-rc2 |
813 |
|
1da177e4c Linux-2.6.12-rc2 |
814 815 |
retval = -ENOEXEC; /* First of all, some simple consistency checks */ |
a62c5b1b6 fs/binfmt_elf.c: ... |
816 |
if (memcmp(elf_ex->e_ident, ELFMAG, SELFMAG) != 0) |
1da177e4c Linux-2.6.12-rc2 |
817 |
goto out; |
a62c5b1b6 fs/binfmt_elf.c: ... |
818 |
if (elf_ex->e_type != ET_EXEC && elf_ex->e_type != ET_DYN) |
1da177e4c Linux-2.6.12-rc2 |
819 |
goto out; |
a62c5b1b6 fs/binfmt_elf.c: ... |
820 |
if (!elf_check_arch(elf_ex)) |
1da177e4c Linux-2.6.12-rc2 |
821 |
goto out; |
a62c5b1b6 fs/binfmt_elf.c: ... |
822 |
if (elf_check_fdpic(elf_ex)) |
4755200b6 binfmt_elf: don't... |
823 |
goto out; |
72c2d5319 file->f_op is nev... |
824 |
if (!bprm->file->f_op->mmap) |
1da177e4c Linux-2.6.12-rc2 |
825 |
goto out; |
a62c5b1b6 fs/binfmt_elf.c: ... |
826 |
elf_phdata = load_elf_phdrs(elf_ex, bprm->file); |
1da177e4c Linux-2.6.12-rc2 |
827 828 |
if (!elf_phdata) goto out; |
1da177e4c Linux-2.6.12-rc2 |
829 |
elf_ppnt = elf_phdata; |
a62c5b1b6 fs/binfmt_elf.c: ... |
830 |
for (i = 0; i < elf_ex->e_phnum; i++, elf_ppnt++) { |
be0deb585 fs/binfmt_elf.c: ... |
831 |
char *elf_interpreter; |
1da177e4c Linux-2.6.12-rc2 |
832 |
|
00e19ceec ELF: Add ELF prog... |
833 834 835 836 |
if (elf_ppnt->p_type == PT_GNU_PROPERTY) { elf_property_phdata = elf_ppnt; continue; } |
be0deb585 fs/binfmt_elf.c: ... |
837 838 |
if (elf_ppnt->p_type != PT_INTERP) continue; |
1fb844961 [PATCH] core-dump... |
839 |
|
be0deb585 fs/binfmt_elf.c: ... |
840 841 842 843 844 845 846 |
/* * This is the program interpreter used for shared libraries - * for now assume that this is an a.out format binary. */ retval = -ENOEXEC; if (elf_ppnt->p_filesz > PATH_MAX || elf_ppnt->p_filesz < 2) goto out_free_ph; |
1da177e4c Linux-2.6.12-rc2 |
847 |
|
be0deb585 fs/binfmt_elf.c: ... |
848 849 850 851 |
retval = -ENOMEM; elf_interpreter = kmalloc(elf_ppnt->p_filesz, GFP_KERNEL); if (!elf_interpreter) goto out_free_ph; |
cc338010a fs/binfmt_elf.c: ... |
852 |
|
658c03356 fs/binfmt_elf.c: ... |
853 854 855 |
retval = elf_read(bprm->file, elf_interpreter, elf_ppnt->p_filesz, elf_ppnt->p_offset); if (retval < 0) |
be0deb585 fs/binfmt_elf.c: ... |
856 |
goto out_free_interp; |
be0deb585 fs/binfmt_elf.c: ... |
857 858 859 860 861 862 863 864 865 |
/* make sure path is NULL terminated */ retval = -ENOEXEC; if (elf_interpreter[elf_ppnt->p_filesz - 1] != '\0') goto out_free_interp; interpreter = open_exec(elf_interpreter); kfree(elf_interpreter); retval = PTR_ERR(interpreter); if (IS_ERR(interpreter)) |
cc338010a fs/binfmt_elf.c: ... |
866 |
goto out_free_ph; |
be0deb585 fs/binfmt_elf.c: ... |
867 868 869 870 871 872 |
/* * If the binary is not readable then enforce mm->dumpable = 0 * regardless of the interpreter's permissions. */ would_dump(bprm, interpreter); |
0693ffebc fs/binfmt_elf.c: ... |
873 874 875 876 877 |
interp_elf_ex = kmalloc(sizeof(*interp_elf_ex), GFP_KERNEL); if (!interp_elf_ex) { retval = -ENOMEM; goto out_free_ph; } |
be0deb585 fs/binfmt_elf.c: ... |
878 |
/* Get the exec headers */ |
c69bcc932 fs/binfmt_elf.c: ... |
879 880 |
retval = elf_read(interpreter, interp_elf_ex, sizeof(*interp_elf_ex), 0); |
658c03356 fs/binfmt_elf.c: ... |
881 |
if (retval < 0) |
be0deb585 fs/binfmt_elf.c: ... |
882 |
goto out_free_dentry; |
be0deb585 fs/binfmt_elf.c: ... |
883 884 885 886 887 888 |
break; out_free_interp: kfree(elf_interpreter); goto out_free_ph; |
1da177e4c Linux-2.6.12-rc2 |
889 890 891 |
} elf_ppnt = elf_phdata; |
a62c5b1b6 fs/binfmt_elf.c: ... |
892 |
for (i = 0; i < elf_ex->e_phnum; i++, elf_ppnt++) |
774c105ed binfmt_elf: allow... |
893 894 |
switch (elf_ppnt->p_type) { case PT_GNU_STACK: |
1da177e4c Linux-2.6.12-rc2 |
895 896 897 898 899 |
if (elf_ppnt->p_flags & PF_X) executable_stack = EXSTACK_ENABLE_X; else executable_stack = EXSTACK_DISABLE_X; break; |
774c105ed binfmt_elf: allow... |
900 901 |
case PT_LOPROC ... PT_HIPROC: |
a62c5b1b6 fs/binfmt_elf.c: ... |
902 |
retval = arch_elf_pt_proc(elf_ex, elf_ppnt, |
774c105ed binfmt_elf: allow... |
903 904 905 906 907 |
bprm->file, false, &arch_state); if (retval) goto out_free_dentry; break; |
1da177e4c Linux-2.6.12-rc2 |
908 |
} |
1da177e4c Linux-2.6.12-rc2 |
909 910 |
/* Some simple consistency checks for the interpreter */ |
cc338010a fs/binfmt_elf.c: ... |
911 |
if (interpreter) { |
1da177e4c Linux-2.6.12-rc2 |
912 |
retval = -ELIBBAD; |
d20894a23 Remove a.out inte... |
913 |
/* Not an ELF interpreter */ |
c69bcc932 fs/binfmt_elf.c: ... |
914 |
if (memcmp(interp_elf_ex->e_ident, ELFMAG, SELFMAG) != 0) |
1da177e4c Linux-2.6.12-rc2 |
915 |
goto out_free_dentry; |
1da177e4c Linux-2.6.12-rc2 |
916 |
/* Verify the interpreter has a valid arch */ |
c69bcc932 fs/binfmt_elf.c: ... |
917 918 |
if (!elf_check_arch(interp_elf_ex) || elf_check_fdpic(interp_elf_ex)) |
1da177e4c Linux-2.6.12-rc2 |
919 |
goto out_free_dentry; |
a9d9ef133 binfmt_elf: load ... |
920 921 |
/* Load the interpreter program headers */ |
c69bcc932 fs/binfmt_elf.c: ... |
922 |
interp_elf_phdata = load_elf_phdrs(interp_elf_ex, |
a9d9ef133 binfmt_elf: load ... |
923 924 925 |
interpreter); if (!interp_elf_phdata) goto out_free_dentry; |
774c105ed binfmt_elf: allow... |
926 927 |
/* Pass PT_LOPROC..PT_HIPROC headers to arch code */ |
00e19ceec ELF: Add ELF prog... |
928 |
elf_property_phdata = NULL; |
774c105ed binfmt_elf: allow... |
929 |
elf_ppnt = interp_elf_phdata; |
c69bcc932 fs/binfmt_elf.c: ... |
930 |
for (i = 0; i < interp_elf_ex->e_phnum; i++, elf_ppnt++) |
774c105ed binfmt_elf: allow... |
931 |
switch (elf_ppnt->p_type) { |
00e19ceec ELF: Add ELF prog... |
932 933 934 |
case PT_GNU_PROPERTY: elf_property_phdata = elf_ppnt; break; |
774c105ed binfmt_elf: allow... |
935 |
case PT_LOPROC ... PT_HIPROC: |
c69bcc932 fs/binfmt_elf.c: ... |
936 |
retval = arch_elf_pt_proc(interp_elf_ex, |
774c105ed binfmt_elf: allow... |
937 938 939 940 941 942 |
elf_ppnt, interpreter, true, &arch_state); if (retval) goto out_free_dentry; break; } |
1da177e4c Linux-2.6.12-rc2 |
943 |
} |
00e19ceec ELF: Add ELF prog... |
944 945 946 947 |
retval = parse_elf_properties(interpreter ?: bprm->file, elf_property_phdata, &arch_state); if (retval) goto out_free_dentry; |
774c105ed binfmt_elf: allow... |
948 949 950 951 952 |
/* * 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. */ |
a62c5b1b6 fs/binfmt_elf.c: ... |
953 |
retval = arch_check_elf(elf_ex, |
c69bcc932 fs/binfmt_elf.c: ... |
954 |
!!interpreter, interp_elf_ex, |
eb4bc076f ELF: Also pass an... |
955 |
&arch_state); |
774c105ed binfmt_elf: allow... |
956 957 |
if (retval) goto out_free_dentry; |
1da177e4c Linux-2.6.12-rc2 |
958 |
/* Flush all traces of the currently running executable */ |
2388777a0 exec: Rename flus... |
959 |
retval = begin_new_exec(bprm); |
1da177e4c Linux-2.6.12-rc2 |
960 961 |
if (retval) goto out_free_dentry; |
1da177e4c Linux-2.6.12-rc2 |
962 963 |
/* Do this immediately, since STACK_TOP as used in setup_arg_pages may depend on the personality. */ |
a62c5b1b6 fs/binfmt_elf.c: ... |
964 965 |
SET_PERSONALITY2(*elf_ex, &arch_state); if (elf_read_implies_exec(*elf_ex, executable_stack)) |
1da177e4c Linux-2.6.12-rc2 |
966 |
current->personality |= READ_IMPLIES_EXEC; |
f4e5cc2c4 [PATCH] binfmt_el... |
967 |
if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space) |
1da177e4c Linux-2.6.12-rc2 |
968 |
current->flags |= PF_RANDOMIZE; |
221af7f87 Split 'flush_old_... |
969 970 |
setup_new_exec(bprm); |
1da177e4c Linux-2.6.12-rc2 |
971 972 973 |
/* 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 |
974 975 |
retval = setup_arg_pages(bprm, randomize_stack_top(STACK_TOP), executable_stack); |
19d860a14 handle suicide on... |
976 |
if (retval < 0) |
1da177e4c Linux-2.6.12-rc2 |
977 |
goto out_free_dentry; |
1da177e4c Linux-2.6.12-rc2 |
978 |
|
852643165 fs//binfmt_elf.c:... |
979 980 981 982 983 984 985 |
elf_bss = 0; elf_brk = 0; start_code = ~0UL; end_code = 0; start_data = 0; end_data = 0; |
af901ca18 tree-wide: fix as... |
986 |
/* Now we do a little grungy work by mmapping the ELF image into |
cc503c1b4 x86: PIE executab... |
987 |
the correct location in memory. */ |
f4e5cc2c4 [PATCH] binfmt_el... |
988 |
for(i = 0, elf_ppnt = elf_phdata; |
a62c5b1b6 fs/binfmt_elf.c: ... |
989 |
i < elf_ex->e_phnum; i++, elf_ppnt++) { |
b212921b1 elf: don't use MA... |
990 |
int elf_prot, elf_flags; |
1da177e4c Linux-2.6.12-rc2 |
991 |
unsigned long k, vaddr; |
a87938b2e fs/binfmt_elf.c: ... |
992 |
unsigned long total_size = 0; |
ce81bb256 fs/binfmt_elf: us... |
993 |
unsigned long alignment; |
1da177e4c Linux-2.6.12-rc2 |
994 995 996 997 998 999 1000 1001 1002 1003 |
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 |
1004 |
retval = set_brk(elf_bss + load_bias, |
16e72e9b3 powerpc: do not m... |
1005 1006 |
elf_brk + load_bias, bss_prot); |
19d860a14 handle suicide on... |
1007 |
if (retval) |
1da177e4c Linux-2.6.12-rc2 |
1008 |
goto out_free_dentry; |
1da177e4c Linux-2.6.12-rc2 |
1009 1010 1011 1012 1013 1014 1015 1016 1017 |
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... |
1018 |
* file specifies odd protections. So |
1da177e4c Linux-2.6.12-rc2 |
1019 1020 1021 1022 1023 |
* we don't check the return value */ } } } |
fe0f67660 elf: Allow arch t... |
1024 1025 |
elf_prot = make_prot(elf_ppnt->p_flags, &arch_state, !!interpreter, false); |
1da177e4c Linux-2.6.12-rc2 |
1026 |
|
4589ff7ca binfmt: remove in... |
1027 |
elf_flags = MAP_PRIVATE; |
1da177e4c Linux-2.6.12-rc2 |
1028 1029 |
vaddr = elf_ppnt->p_vaddr; |
eab09532d binfmt_elf: use E... |
1030 1031 1032 1033 |
/* * If we are loading ET_EXEC or we have already performed * the ET_DYN load_addr calculations, proceed normally. */ |
a62c5b1b6 fs/binfmt_elf.c: ... |
1034 |
if (elf_ex->e_type == ET_EXEC || load_addr_set) { |
b212921b1 elf: don't use MA... |
1035 |
elf_flags |= MAP_FIXED; |
a62c5b1b6 fs/binfmt_elf.c: ... |
1036 |
} else if (elf_ex->e_type == ET_DYN) { |
eab09532d binfmt_elf: use E... |
1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 |
/* * This logic is run once for the first LOAD Program * Header for ET_DYN binaries to calculate the * randomization (load_bias) for all the LOAD * Program Headers, and to calculate the entire * size of the ELF mapping (total_size). (Note that * load_addr_set is set to true later once the * initial mapping is performed.) * * There are effectively two types of ET_DYN * binaries: programs (i.e. PIE: ET_DYN with INTERP) * and loaders (ET_DYN without INTERP, since they * _are_ the ELF interpreter). The loaders must * be loaded away from programs since the program * may otherwise collide with the loader (especially * for ET_EXEC which does not have a randomized * position). For example to handle invocations of * "./ld.so someprog" to test out a new version of * the loader, the subsequent program that the * loader loads must avoid the loader itself, so * they cannot share the same load range. Sufficient * room for the brk must be allocated with the * loader as well, since brk must be available with * the loader. * * Therefore, programs are loaded offset from * ELF_ET_DYN_BASE and loaders are loaded into the * independently randomized mmap region (0 load_bias * without MAP_FIXED). */ |
cc338010a fs/binfmt_elf.c: ... |
1067 |
if (interpreter) { |
eab09532d binfmt_elf: use E... |
1068 1069 1070 |
load_bias = ELF_ET_DYN_BASE; if (current->flags & PF_RANDOMIZE) load_bias += arch_mmap_rnd(); |
ce81bb256 fs/binfmt_elf: us... |
1071 1072 1073 |
alignment = maximum_alignment(elf_phdata, elf_ex->e_phnum); if (alignment) load_bias &= ~(alignment - 1); |
b212921b1 elf: don't use MA... |
1074 |
elf_flags |= MAP_FIXED; |
eab09532d binfmt_elf: use E... |
1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 |
} else load_bias = 0; /* * Since load_bias is used for all subsequent loading * calculations, we must lower it by the first vaddr * so that the remaining calculations based on the * ELF vaddrs will be correctly offset. The result * is then page aligned. */ load_bias = ELF_PAGESTART(load_bias - vaddr); |
a87938b2e fs/binfmt_elf.c: ... |
1086 |
total_size = total_mapping_size(elf_phdata, |
a62c5b1b6 fs/binfmt_elf.c: ... |
1087 |
elf_ex->e_phnum); |
a87938b2e fs/binfmt_elf.c: ... |
1088 |
if (!total_size) { |
2b1d3ae94 fs/binfmt_elf.c:l... |
1089 |
retval = -EINVAL; |
a87938b2e fs/binfmt_elf.c: ... |
1090 1091 |
goto out_free_dentry; } |
1da177e4c Linux-2.6.12-rc2 |
1092 |
} |
f4e5cc2c4 [PATCH] binfmt_el... |
1093 |
error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt, |
a87938b2e fs/binfmt_elf.c: ... |
1094 |
elf_prot, elf_flags, total_size); |
1da177e4c Linux-2.6.12-rc2 |
1095 |
if (BAD_ADDR(error)) { |
b140f2510 Invalid return va... |
1096 1097 |
retval = IS_ERR((void *)error) ? PTR_ERR((void*)error) : -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
1098 1099 1100 1101 1102 1103 |
goto out_free_dentry; } if (!load_addr_set) { load_addr_set = 1; load_addr = (elf_ppnt->p_vaddr - elf_ppnt->p_offset); |
a62c5b1b6 fs/binfmt_elf.c: ... |
1104 |
if (elf_ex->e_type == ET_DYN) { |
1da177e4c Linux-2.6.12-rc2 |
1105 1106 1107 1108 1109 1110 |
load_bias += error - ELF_PAGESTART(load_bias + vaddr); load_addr += load_bias; reloc_func_desc = load_bias; } } |
e0943c456 fs/binfmt_elf: Fi... |
1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 |
/* * Figure out which segment in the file contains the Program * Header table, and map to the associated memory address. */ if (elf_ppnt->p_offset <= elf_ex->e_phoff && elf_ex->e_phoff < elf_ppnt->p_offset + elf_ppnt->p_filesz) { phdr_addr = elf_ex->e_phoff - elf_ppnt->p_offset + elf_ppnt->p_vaddr; } |
1da177e4c Linux-2.6.12-rc2 |
1121 |
k = elf_ppnt->p_vaddr; |
f67ef4462 fs/binfmt_elf.c: ... |
1122 |
if ((elf_ppnt->p_flags & PF_X) && k < start_code) |
f4e5cc2c4 [PATCH] binfmt_el... |
1123 1124 1125 |
start_code = k; if (start_data < k) start_data = k; |
1da177e4c Linux-2.6.12-rc2 |
1126 1127 1128 1129 1130 1131 |
/* * 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... |
1132 |
if (BAD_ADDR(k) || elf_ppnt->p_filesz > elf_ppnt->p_memsz || |
1da177e4c Linux-2.6.12-rc2 |
1133 1134 |
elf_ppnt->p_memsz > TASK_SIZE || TASK_SIZE - elf_ppnt->p_memsz < k) { |
f4e5cc2c4 [PATCH] binfmt_el... |
1135 |
/* set_brk can never work. Avoid overflows. */ |
b140f2510 Invalid return va... |
1136 |
retval = -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 |
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; |
16e72e9b3 powerpc: do not m... |
1149 1150 |
if (k > elf_brk) { bss_prot = elf_prot; |
1da177e4c Linux-2.6.12-rc2 |
1151 |
elf_brk = k; |
16e72e9b3 powerpc: do not m... |
1152 |
} |
1da177e4c Linux-2.6.12-rc2 |
1153 |
} |
a62c5b1b6 fs/binfmt_elf.c: ... |
1154 |
e_entry = elf_ex->e_entry + load_bias; |
e0943c456 fs/binfmt_elf: Fi... |
1155 |
phdr_addr += load_bias; |
1da177e4c Linux-2.6.12-rc2 |
1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 |
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. */ |
16e72e9b3 powerpc: do not m... |
1168 |
retval = set_brk(elf_bss, elf_brk, bss_prot); |
19d860a14 handle suicide on... |
1169 |
if (retval) |
1da177e4c Linux-2.6.12-rc2 |
1170 |
goto out_free_dentry; |
6de505173 [PATCH] binfmt_el... |
1171 |
if (likely(elf_bss != elf_brk) && unlikely(padzero(elf_bss))) { |
1da177e4c Linux-2.6.12-rc2 |
1172 1173 1174 |
retval = -EFAULT; /* Nobody gets to see this, but.. */ goto out_free_dentry; } |
cc338010a fs/binfmt_elf.c: ... |
1175 |
if (interpreter) { |
c69bcc932 fs/binfmt_elf.c: ... |
1176 |
elf_entry = load_elf_interp(interp_elf_ex, |
d20894a23 Remove a.out inte... |
1177 |
interpreter, |
fe0f67660 elf: Allow arch t... |
1178 1179 |
load_bias, interp_elf_phdata, &arch_state); |
d20894a23 Remove a.out inte... |
1180 1181 1182 1183 1184 1185 |
if (!IS_ERR((void *)elf_entry)) { /* * load_elf_interp() returns relocation * adjustment */ interp_load_addr = elf_entry; |
c69bcc932 fs/binfmt_elf.c: ... |
1186 |
elf_entry += interp_elf_ex->e_entry; |
cc503c1b4 x86: PIE executab... |
1187 |
} |
1da177e4c Linux-2.6.12-rc2 |
1188 |
if (BAD_ADDR(elf_entry)) { |
ce51059be [PATCH] binfmt_el... |
1189 1190 |
retval = IS_ERR((void *)elf_entry) ? (int)elf_entry : -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
1191 1192 1193 1194 1195 1196 |
goto out_free_dentry; } reloc_func_desc = interp_load_addr; allow_write_access(interpreter); fput(interpreter); |
0693ffebc fs/binfmt_elf.c: ... |
1197 1198 |
kfree(interp_elf_ex); |
aa0d1564b fs/binfmt_elf.c: ... |
1199 |
kfree(interp_elf_phdata); |
1da177e4c Linux-2.6.12-rc2 |
1200 |
} else { |
a62c5b1b6 fs/binfmt_elf.c: ... |
1201 |
elf_entry = e_entry; |
5342fba54 [PATCH] x86_64: C... |
1202 |
if (BAD_ADDR(elf_entry)) { |
ce51059be [PATCH] binfmt_el... |
1203 |
retval = -EINVAL; |
5342fba54 [PATCH] x86_64: C... |
1204 1205 |
goto out_free_dentry; } |
1da177e4c Linux-2.6.12-rc2 |
1206 1207 1208 |
} kfree(elf_phdata); |
1da177e4c Linux-2.6.12-rc2 |
1209 |
set_binfmt(&elf_format); |
547ee84ce [PATCH] ppc64: Im... |
1210 |
#ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES |
9a29a6719 elf: Expose ELF h... |
1211 |
retval = ARCH_SETUP_ADDITIONAL_PAGES(bprm, elf_ex, !!interpreter); |
19d860a14 handle suicide on... |
1212 |
if (retval < 0) |
18c8baff8 [PATCH] Fix error... |
1213 |
goto out; |
547ee84ce [PATCH] ppc64: Im... |
1214 |
#endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */ |
e0943c456 fs/binfmt_elf: Fi... |
1215 1216 |
retval = create_elf_tables(bprm, elf_ex, interp_load_addr, e_entry, phdr_addr); |
19d860a14 handle suicide on... |
1217 |
if (retval < 0) |
b6a2fea39 mm: variable leng... |
1218 |
goto out; |
03c6d723e fs/binfmt_elf.c: ... |
1219 1220 1221 1222 1223 1224 1225 |
mm = current->mm; mm->end_code = end_code; mm->start_code = start_code; mm->start_data = start_data; mm->end_data = end_data; mm->start_stack = bprm->p; |
1da177e4c Linux-2.6.12-rc2 |
1226 |
|
4471a675d brk: COMPAT_BRK: ... |
1227 |
if ((current->flags & PF_RANDOMIZE) && (randomize_va_space > 1)) { |
bbdc6076d binfmt_elf: move ... |
1228 1229 1230 1231 1232 1233 1234 |
/* * For architectures with ELF randomization, when executing * a loader directly (i.e. no interpreter listed in ELF * headers), move the brk area out of the mmap region * (since it grows up, and may collide early with the stack * growing down), and into the unused ELF_ET_DYN_BASE region. */ |
7be3cb019 binfmt_elf: Do no... |
1235 |
if (IS_ENABLED(CONFIG_ARCH_HAS_ELF_RANDOMIZE) && |
03c6d723e fs/binfmt_elf.c: ... |
1236 1237 1238 |
elf_ex->e_type == ET_DYN && !interpreter) { mm->brk = mm->start_brk = ELF_ET_DYN_BASE; } |
bbdc6076d binfmt_elf: move ... |
1239 |
|
03c6d723e fs/binfmt_elf.c: ... |
1240 |
mm->brk = mm->start_brk = arch_randomize_brk(mm); |
204db6ed1 mm: fold arch_ran... |
1241 |
#ifdef compat_brk_randomized |
4471a675d brk: COMPAT_BRK: ... |
1242 1243 1244 |
current->brk_randomized = 1; #endif } |
c1d171a00 x86: randomize brk |
1245 |
|
1da177e4c Linux-2.6.12-rc2 |
1246 1247 1248 1249 |
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... |
1250 |
emulate the SVr4 behavior. Sigh. */ |
6be5ceb02 VM: add "vm_mmap(... |
1251 |
error = vm_mmap(NULL, 0, PAGE_SIZE, PROT_READ | PROT_EXEC, |
1da177e4c Linux-2.6.12-rc2 |
1252 |
MAP_FIXED | MAP_PRIVATE, 0); |
1da177e4c Linux-2.6.12-rc2 |
1253 |
} |
249b08e4e elf: init pt_regs... |
1254 |
regs = current_pt_regs(); |
1da177e4c Linux-2.6.12-rc2 |
1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 |
#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 |
b83838313 exec: introduce f... |
1268 |
finalize_exec(bprm); |
bc3d7bf61 elf: Expose ELF h... |
1269 |
START_THREAD(elf_ex, regs, elf_entry, bprm->p); |
1da177e4c Linux-2.6.12-rc2 |
1270 1271 |
retval = 0; out: |
1da177e4c Linux-2.6.12-rc2 |
1272 1273 1274 1275 |
return retval; /* error cleanup */ out_free_dentry: |
0693ffebc fs/binfmt_elf.c: ... |
1276 |
kfree(interp_elf_ex); |
a9d9ef133 binfmt_elf: load ... |
1277 |
kfree(interp_elf_phdata); |
1da177e4c Linux-2.6.12-rc2 |
1278 1279 1280 |
allow_write_access(interpreter); if (interpreter) fput(interpreter); |
1da177e4c Linux-2.6.12-rc2 |
1281 1282 1283 1284 |
out_free_ph: kfree(elf_phdata); goto out; } |
69369a700 fs, kernel: permi... |
1285 |
#ifdef CONFIG_USELIB |
1da177e4c Linux-2.6.12-rc2 |
1286 1287 |
/* 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 |
1288 1289 1290 1291 1292 1293 1294 1295 1296 |
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; |
658c03356 fs/binfmt_elf.c: ... |
1297 1298 |
retval = elf_read(file, &elf_ex, sizeof(elf_ex), 0); if (retval < 0) |
1da177e4c Linux-2.6.12-rc2 |
1299 1300 1301 1302 1303 1304 1305 |
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... |
1306 |
!elf_check_arch(&elf_ex) || !file->f_op->mmap) |
1da177e4c Linux-2.6.12-rc2 |
1307 |
goto out; |
4755200b6 binfmt_elf: don't... |
1308 1309 |
if (elf_check_fdpic(&elf_ex)) goto out; |
1da177e4c Linux-2.6.12-rc2 |
1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 |
/* 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; |
658c03356 fs/binfmt_elf.c: ... |
1323 1324 |
retval = elf_read(file, eppnt, j, elf_ex.e_phoff); if (retval < 0) |
1da177e4c Linux-2.6.12-rc2 |
1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 |
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(... |
1337 |
error = vm_mmap(file, |
1da177e4c Linux-2.6.12-rc2 |
1338 1339 1340 1341 |
ELF_PAGESTART(eppnt->p_vaddr), (eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr)), PROT_READ | PROT_WRITE | PROT_EXEC, |
42be8b425 binfmt: don't use... |
1342 |
MAP_FIXED_NOREPLACE | MAP_PRIVATE, |
1da177e4c Linux-2.6.12-rc2 |
1343 1344 |
(eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr))); |
1da177e4c Linux-2.6.12-rc2 |
1345 1346 1347 1348 1349 1350 1351 1352 |
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; } |
24962af7e fs, elf: make sur... |
1353 1354 |
len = ELF_PAGEALIGN(eppnt->p_filesz + eppnt->p_vaddr); bss = ELF_PAGEALIGN(eppnt->p_memsz + eppnt->p_vaddr); |
ecc2bc8ac mm, elf: handle v... |
1355 1356 |
if (bss > len) { error = vm_brk(len, bss - len); |
5d22fc25d mm: remove more I... |
1357 |
if (error) |
ecc2bc8ac mm, elf: handle v... |
1358 1359 |
goto out_free_ph; } |
1da177e4c Linux-2.6.12-rc2 |
1360 1361 1362 1363 1364 1365 1366 |
error = 0; out_free_ph: kfree(elf_phdata); out: return error; } |
69369a700 fs, kernel: permi... |
1367 |
#endif /* #ifdef CONFIG_USELIB */ |
1da177e4c Linux-2.6.12-rc2 |
1368 |
|
698ba7b5a elf: kill USE_ELF... |
1369 |
#ifdef CONFIG_ELF_CORE |
1da177e4c Linux-2.6.12-rc2 |
1370 1371 1372 1373 1374 1375 |
/* * ELF core dumper * * Modelled on fs/exec.c:aout_core_dump() * Jeremy Fitzhardinge <jeremy@sw.oz.au> */ |
1da177e4c Linux-2.6.12-rc2 |
1376 |
|
1da177e4c Linux-2.6.12-rc2 |
1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 |
/* 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_... |
1396 |
static int writenote(struct memelfnote *men, struct coredump_params *cprm) |
d025c9db7 [PATCH] Support p... |
1397 1398 |
{ struct elf_note en; |
1da177e4c Linux-2.6.12-rc2 |
1399 1400 1401 |
en.n_namesz = strlen(men->name) + 1; en.n_descsz = men->datasz; en.n_type = men->type; |
ecc8c7725 new helper: dump_... |
1402 |
return dump_emit(cprm, &en, sizeof(en)) && |
22a8cb824 new helper: dump_... |
1403 1404 |
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 |
1405 |
} |
1da177e4c Linux-2.6.12-rc2 |
1406 |
|
3aba481fc elf core dump: no... |
1407 |
static void fill_elf_header(struct elfhdr *elf, int segs, |
d3330cf08 binfmt_elf: remov... |
1408 |
u16 machine, u32 flags) |
1da177e4c Linux-2.6.12-rc2 |
1409 |
{ |
6970c8eff BINFMT: fill_elf_... |
1410 |
memset(elf, 0, sizeof(*elf)); |
1da177e4c Linux-2.6.12-rc2 |
1411 1412 1413 1414 1415 |
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 |
1416 1417 |
elf->e_type = ET_CORE; |
3aba481fc elf core dump: no... |
1418 |
elf->e_machine = machine; |
1da177e4c Linux-2.6.12-rc2 |
1419 |
elf->e_version = EV_CURRENT; |
1da177e4c Linux-2.6.12-rc2 |
1420 |
elf->e_phoff = sizeof(struct elfhdr); |
3aba481fc elf core dump: no... |
1421 |
elf->e_flags = flags; |
1da177e4c Linux-2.6.12-rc2 |
1422 1423 1424 |
elf->e_ehsize = sizeof(struct elfhdr); elf->e_phentsize = sizeof(struct elf_phdr); elf->e_phnum = segs; |
1da177e4c Linux-2.6.12-rc2 |
1425 |
} |
8d6b5eeea [PATCH] binfmt_el... |
1426 |
static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset) |
1da177e4c Linux-2.6.12-rc2 |
1427 1428 1429 1430 1431 1432 1433 1434 1435 |
{ 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; |
1da177e4c Linux-2.6.12-rc2 |
1436 1437 1438 1439 1440 1441 1442 1443 1444 |
} 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; |
1da177e4c Linux-2.6.12-rc2 |
1445 1446 1447 |
} /* |
f4e5cc2c4 [PATCH] binfmt_el... |
1448 1449 |
* 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 |
1450 |
*/ |
f2485a2dc elf_prstatus: col... |
1451 |
static void fill_prstatus(struct elf_prstatus_common *prstatus, |
f4e5cc2c4 [PATCH] binfmt_el... |
1452 |
struct task_struct *p, long signr) |
1da177e4c Linux-2.6.12-rc2 |
1453 1454 1455 1456 |
{ 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... |
1457 1458 1459 |
rcu_read_lock(); prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); rcu_read_unlock(); |
b488893a3 pid namespaces: c... |
1460 |
prstatus->pr_pid = task_pid_vnr(p); |
b488893a3 pid namespaces: c... |
1461 1462 |
prstatus->pr_pgrp = task_pgrp_vnr(p); prstatus->pr_sid = task_session_vnr(p); |
1da177e4c Linux-2.6.12-rc2 |
1463 |
if (thread_group_leader(p)) { |
cd19c364b fs/binfmt: Conver... |
1464 |
struct task_cputime cputime; |
f06febc96 timers: fix itime... |
1465 |
|
1da177e4c Linux-2.6.12-rc2 |
1466 |
/* |
f06febc96 timers: fix itime... |
1467 1468 |
* 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 |
1469 |
*/ |
cd19c364b fs/binfmt: Conver... |
1470 |
thread_group_cputime(p, &cputime); |
e2bb80d55 y2038: elfcore: U... |
1471 1472 |
prstatus->pr_utime = ns_to_kernel_old_timeval(cputime.utime); prstatus->pr_stime = ns_to_kernel_old_timeval(cputime.stime); |
1da177e4c Linux-2.6.12-rc2 |
1473 |
} else { |
cd19c364b fs/binfmt: Conver... |
1474 |
u64 utime, stime; |
6fac4829c cputime: Use acce... |
1475 |
|
cd19c364b fs/binfmt: Conver... |
1476 |
task_cputime(p, &utime, &stime); |
e2bb80d55 y2038: elfcore: U... |
1477 1478 |
prstatus->pr_utime = ns_to_kernel_old_timeval(utime); prstatus->pr_stime = ns_to_kernel_old_timeval(stime); |
1da177e4c Linux-2.6.12-rc2 |
1479 |
} |
5613fda9a sched/cputime: Co... |
1480 |
|
e2bb80d55 y2038: elfcore: U... |
1481 1482 |
prstatus->pr_cutime = ns_to_kernel_old_timeval(p->signal->cutime); prstatus->pr_cstime = ns_to_kernel_old_timeval(p->signal->cstime); |
1da177e4c Linux-2.6.12-rc2 |
1483 1484 1485 1486 1487 |
} static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p, struct mm_struct *mm) { |
c69e8d9c0 CRED: Use RCU to ... |
1488 |
const struct cred *cred; |
a84a50595 [PATCH] fix Linux... |
1489 |
unsigned int i, len; |
2f064a59a sched: Change tas... |
1490 |
unsigned int state; |
1da177e4c Linux-2.6.12-rc2 |
1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 |
/* 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... |
1504 1505 1506 |
rcu_read_lock(); psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); rcu_read_unlock(); |
b488893a3 pid namespaces: c... |
1507 |
psinfo->pr_pid = task_pid_vnr(p); |
b488893a3 pid namespaces: c... |
1508 1509 |
psinfo->pr_pgrp = task_pgrp_vnr(p); psinfo->pr_sid = task_session_vnr(p); |
1da177e4c Linux-2.6.12-rc2 |
1510 |
|
2f064a59a sched: Change tas... |
1511 1512 |
state = READ_ONCE(p->__state); i = state ? ffz(~state) + 1 : 0; |
1da177e4c Linux-2.6.12-rc2 |
1513 |
psinfo->pr_state = i; |
551485481 [PATCH] remove ne... |
1514 |
psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i]; |
1da177e4c Linux-2.6.12-rc2 |
1515 1516 1517 |
psinfo->pr_zomb = psinfo->pr_sname == 'Z'; psinfo->pr_nice = task_nice(p); psinfo->pr_flag = p->flags; |
c69e8d9c0 CRED: Use RCU to ... |
1518 1519 |
rcu_read_lock(); cred = __task_cred(p); |
ebc887b27 userns: Convert b... |
1520 1521 |
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 ... |
1522 |
rcu_read_unlock(); |
1da177e4c Linux-2.6.12-rc2 |
1523 |
strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname)); |
2f064a59a sched: Change tas... |
1524 |
|
1da177e4c Linux-2.6.12-rc2 |
1525 1526 |
return 0; } |
3aba481fc elf core dump: no... |
1527 1528 1529 1530 1531 1532 1533 1534 1535 |
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... |
1536 |
static void fill_siginfo_note(struct memelfnote *note, user_siginfo_t *csigdata, |
ae7795bc6 signal: Distingui... |
1537 |
const kernel_siginfo_t *siginfo) |
49ae4d4b1 coredump: add a n... |
1538 |
{ |
fa4751f45 binfmt_elf: remov... |
1539 |
copy_siginfo_to_external(csigdata, siginfo); |
49ae4d4b1 coredump: add a n... |
1540 1541 |
fill_note(note, "CORE", NT_SIGINFO, sizeof(*csigdata), csigdata); } |
2aa362c49 coredump: extend ... |
1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 |
#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... */ |
39fd0cc07 coredump: Use the... |
1554 |
static int fill_files_note(struct memelfnote *note, struct coredump_params *cprm) |
2aa362c49 coredump: extend ... |
1555 |
{ |
2aa362c49 coredump: extend ... |
1556 1557 1558 1559 |
unsigned count, size, names_ofs, remaining, n; user_long_t *data; user_long_t *start_end_ofs; char *name_base, *name_curpos; |
39fd0cc07 coredump: Use the... |
1560 |
int i; |
2aa362c49 coredump: extend ... |
1561 1562 |
/* *Estimated* file count and total data size needed */ |
39fd0cc07 coredump: Use the... |
1563 |
count = cprm->vma_count; |
60c9d92f8 elf: fix NT_FILE ... |
1564 1565 |
if (count > UINT_MAX / 64) return -EINVAL; |
2aa362c49 coredump: extend ... |
1566 1567 1568 1569 1570 |
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: ... |
1571 |
return -EINVAL; |
2aa362c49 coredump: extend ... |
1572 |
size = round_up(size, PAGE_SIZE); |
1fbede6e6 fs/binfmt_elf.c: ... |
1573 1574 1575 1576 |
/* * "size" can be 0 here legitimately. * Let it ENOMEM and omit NT_FILE section which will be empty anyway. */ |
86a2bb5ad coredump: fix spa... |
1577 1578 |
data = kvmalloc(size, GFP_KERNEL); if (ZERO_OR_NULL_PTR(data)) |
720236569 fs/binfmt_elf.c: ... |
1579 |
return -ENOMEM; |
2aa362c49 coredump: extend ... |
1580 1581 1582 1583 1584 |
start_end_ofs = data + 2; name_base = name_curpos = ((char *)data) + names_ofs; remaining = size - names_ofs; count = 0; |
39fd0cc07 coredump: Use the... |
1585 1586 |
for (i = 0; i < cprm->vma_count; i++) { struct core_vma_metadata *m = &cprm->vma_meta[i]; |
2aa362c49 coredump: extend ... |
1587 1588 |
struct file *file; const char *filename; |
39fd0cc07 coredump: Use the... |
1589 |
file = m->file; |
2aa362c49 coredump: extend ... |
1590 1591 |
if (!file) continue; |
9bf39ab2a vfs: add file_pat... |
1592 |
filename = file_path(file, name_curpos, remaining); |
2aa362c49 coredump: extend ... |
1593 1594 |
if (IS_ERR(filename)) { if (PTR_ERR(filename) == -ENAMETOOLONG) { |
86a2bb5ad coredump: fix spa... |
1595 |
kvfree(data); |
2aa362c49 coredump: extend ... |
1596 1597 1598 1599 1600 |
size = size * 5 / 4; goto alloc; } continue; } |
9bf39ab2a vfs: add file_pat... |
1601 |
/* file_path() fills at the end, move name down */ |
2aa362c49 coredump: extend ... |
1602 1603 1604 1605 1606 |
/* n = strlen(filename) + 1: */ n = (name_curpos + remaining) - filename; remaining = filename - name_curpos; memmove(name_curpos, filename, n); name_curpos += n; |
39fd0cc07 coredump: Use the... |
1607 1608 1609 |
*start_end_ofs++ = m->start; *start_end_ofs++ = m->end; *start_end_ofs++ = m->pgoff; |
2aa362c49 coredump: extend ... |
1610 1611 1612 1613 1614 1615 1616 |
count++; } /* Now we know exact count of files, can store it */ data[0] = count; data[1] = PAGE_SIZE; /* |
03c6d723e fs/binfmt_elf.c: ... |
1617 |
* Count usually is less than mm->map_count, |
2aa362c49 coredump: extend ... |
1618 1619 |
* we need to move filenames down. */ |
39fd0cc07 coredump: Use the... |
1620 |
n = cprm->vma_count - count; |
2aa362c49 coredump: extend ... |
1621 1622 1623 1624 1625 1626 1627 1628 1629 |
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: ... |
1630 |
return 0; |
2aa362c49 coredump: extend ... |
1631 |
} |
4206d3aa1 elf core dump: no... |
1632 1633 1634 1635 1636 1637 1638 |
#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; |
5e01fdff0 fs: Replace zero-... |
1639 |
struct memelfnote notes[]; |
4206d3aa1 elf core dump: no... |
1640 1641 1642 1643 1644 |
}; struct elf_note_info { struct elf_thread_core_info *thread; struct memelfnote psinfo; |
49ae4d4b1 coredump: add a n... |
1645 |
struct memelfnote signote; |
4206d3aa1 elf core dump: no... |
1646 |
struct memelfnote auxv; |
2aa362c49 coredump: extend ... |
1647 |
struct memelfnote files; |
49ae4d4b1 coredump: add a n... |
1648 |
user_siginfo_t csigdata; |
4206d3aa1 elf core dump: no... |
1649 1650 1651 |
size_t size; int thread_notes; }; |
d31472b6d core dump: user_r... |
1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 |
/* * 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... |
1663 |
#ifndef PRSTATUS_SIZE |
8a00dd001 binfmt_elf: parti... |
1664 |
#define PRSTATUS_SIZE sizeof(struct elf_prstatus) |
0953f65d5 elf: Allow core d... |
1665 1666 1667 |
#endif #ifndef SET_PR_FPVALID |
8a00dd001 binfmt_elf: parti... |
1668 |
#define SET_PR_FPVALID(S) ((S)->pr_fpvalid = 1) |
0953f65d5 elf: Allow core d... |
1669 |
#endif |
4206d3aa1 elf core dump: no... |
1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 |
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. */ |
f2485a2dc elf_prstatus: col... |
1682 |
fill_prstatus(&t->prstatus.common, t->task, signr); |
8a00dd001 binfmt_elf: parti... |
1683 |
regset_get(t->task, &view->regsets[0], |
b4e9c9549 introduction of r... |
1684 |
sizeof(t->prstatus.pr_reg), &t->prstatus.pr_reg); |
4206d3aa1 elf core dump: no... |
1685 1686 |
fill_note(&t->notes[0], "CORE", NT_PRSTATUS, |
8a00dd001 binfmt_elf: parti... |
1687 |
PRSTATUS_SIZE, &t->prstatus); |
4206d3aa1 elf core dump: no... |
1688 |
*total += notesize(&t->notes[0]); |
d31472b6d core dump: user_r... |
1689 |
do_thread_regset_writeback(t->task, &view->regsets[0]); |
4206d3aa1 elf core dump: no... |
1690 1691 1692 1693 1694 1695 1696 |
/* * 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]; |
b4e9c9549 introduction of r... |
1697 1698 1699 1700 |
int note_type = regset->core_note_type; bool is_fpreg = note_type == NT_PRFPREG; void *data; int ret; |
d31472b6d core dump: user_r... |
1701 |
do_thread_regset_writeback(t->task, regset); |
b4e9c9549 introduction of r... |
1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 |
if (!note_type) // not for coredumps continue; if (regset->active && regset->active(t->task, regset) <= 0) continue; ret = regset_get_alloc(t->task, regset, ~0U, &data); if (ret < 0) continue; if (is_fpreg) |
8a00dd001 binfmt_elf: parti... |
1712 |
SET_PR_FPVALID(&t->prstatus); |
b4e9c9549 introduction of r... |
1713 1714 1715 1716 1717 |
fill_note(&t->notes[i], is_fpreg ? "CORE" : "LINUX", note_type, ret, data); *total += notesize(&t->notes[i]); |
4206d3aa1 elf core dump: no... |
1718 1719 1720 1721 1722 1723 1724 |
} return 1; } static int fill_note_info(struct elfhdr *elf, int phdrs, struct elf_note_info *info, |
cabd69640 coredump/elf: Pas... |
1725 |
struct coredump_params *cprm) |
4206d3aa1 elf core dump: no... |
1726 1727 1728 1729 1730 |
{ 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... |
1731 |
struct core_thread *ct; |
4206d3aa1 elf core dump: no... |
1732 1733 1734 1735 1736 1737 |
unsigned int i; info->size = 0; info->thread = NULL; psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL); |
6899e92d6 binfmt_elf: fix c... |
1738 1739 |
if (psinfo == NULL) { info->psinfo.data = NULL; /* So we don't free this wrongly */ |
4206d3aa1 elf core dump: no... |
1740 |
return 0; |
6899e92d6 binfmt_elf: fix c... |
1741 |
} |
4206d3aa1 elf core dump: no... |
1742 |
|
e2dbe1255 elf: fix one chec... |
1743 |
fill_note(&info->psinfo, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo); |
4206d3aa1 elf core dump: no... |
1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 |
/* * 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... |
1766 |
view->e_machine, view->e_flags); |
4206d3aa1 elf core dump: no... |
1767 1768 1769 1770 |
/* * Allocate a structure for each thread. */ |
83914441f coredump: elf_cor... |
1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 |
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... |
1789 |
} |
83914441f coredump: elf_cor... |
1790 |
} |
4206d3aa1 elf core dump: no... |
1791 1792 1793 1794 1795 |
/* * Now fill in each thread's information. */ for (t = info->thread; t != NULL; t = t->next) |
cabd69640 coredump/elf: Pas... |
1796 |
if (!fill_thread_core_info(t, view, cprm->siginfo->si_signo, &info->size)) |
4206d3aa1 elf core dump: no... |
1797 1798 1799 1800 1801 1802 1803 |
return 0; /* * Fill in the two process-wide notes. */ fill_psinfo(psinfo, dump_task->group_leader, dump_task->mm); info->size += notesize(&info->psinfo); |
cabd69640 coredump/elf: Pas... |
1804 |
fill_siginfo_note(&info->signote, &info->csigdata, cprm->siginfo); |
49ae4d4b1 coredump: add a n... |
1805 |
info->size += notesize(&info->signote); |
4206d3aa1 elf core dump: no... |
1806 1807 |
fill_auxv_note(&info->auxv, current->mm); info->size += notesize(&info->auxv); |
39fd0cc07 coredump: Use the... |
1808 |
if (fill_files_note(&info->files, cprm) == 0) |
720236569 fs/binfmt_elf.c: ... |
1809 |
info->size += notesize(&info->files); |
2aa362c49 coredump: extend ... |
1810 |
|
4206d3aa1 elf core dump: no... |
1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 |
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_... |
1824 |
struct coredump_params *cprm) |
4206d3aa1 elf core dump: no... |
1825 |
{ |
b219e25f8 fs/binfmt_elf.c: ... |
1826 |
bool first = true; |
4206d3aa1 elf core dump: no... |
1827 1828 1829 1830 |
struct elf_thread_core_info *t = info->thread; do { int i; |
ecc8c7725 new helper: dump_... |
1831 |
if (!writenote(&t->notes[0], cprm)) |
4206d3aa1 elf core dump: no... |
1832 |
return 0; |
ecc8c7725 new helper: dump_... |
1833 |
if (first && !writenote(&info->psinfo, cprm)) |
4206d3aa1 elf core dump: no... |
1834 |
return 0; |
ecc8c7725 new helper: dump_... |
1835 |
if (first && !writenote(&info->signote, cprm)) |
49ae4d4b1 coredump: add a n... |
1836 |
return 0; |
ecc8c7725 new helper: dump_... |
1837 |
if (first && !writenote(&info->auxv, cprm)) |
4206d3aa1 elf core dump: no... |
1838 |
return 0; |
720236569 fs/binfmt_elf.c: ... |
1839 |
if (first && info->files.data && |
ecc8c7725 new helper: dump_... |
1840 |
!writenote(&info->files, cprm)) |
2aa362c49 coredump: extend ... |
1841 |
return 0; |
4206d3aa1 elf core dump: no... |
1842 1843 1844 |
for (i = 1; i < info->thread_notes; ++i) if (t->notes[i].data && |
ecc8c7725 new helper: dump_... |
1845 |
!writenote(&t->notes[i], cprm)) |
4206d3aa1 elf core dump: no... |
1846 |
return 0; |
b219e25f8 fs/binfmt_elf.c: ... |
1847 |
first = false; |
4206d3aa1 elf core dump: no... |
1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 |
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); |
86a2bb5ad coredump: fix spa... |
1867 |
kvfree(info->files.data); |
4206d3aa1 elf core dump: no... |
1868 1869 1870 |
} #else |
1da177e4c Linux-2.6.12-rc2 |
1871 1872 1873 1874 1875 1876 1877 |
/* 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; |
1da177e4c Linux-2.6.12-rc2 |
1878 1879 1880 1881 1882 1883 |
struct memelfnote notes[3]; int num_notes; }; /* * In order to add the specific thread information for the elf file format, |
f4e5cc2c4 [PATCH] binfmt_el... |
1884 1885 |
* 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 |
1886 1887 1888 1889 1890 1891 |
*/ 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; |
f2485a2dc elf_prstatus: col... |
1892 |
fill_prstatus(&t->prstatus.common, p, signr); |
1da177e4c Linux-2.6.12-rc2 |
1893 1894 |
elf_core_copy_task_regs(p, &t->prstatus.pr_reg); |
f4e5cc2c4 [PATCH] binfmt_el... |
1895 1896 |
fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), &(t->prstatus)); |
1da177e4c Linux-2.6.12-rc2 |
1897 1898 |
t->num_notes++; sz += notesize(&t->notes[0]); |
f4e5cc2c4 [PATCH] binfmt_el... |
1899 1900 1901 1902 |
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 |
1903 1904 1905 |
t->num_notes++; sz += notesize(&t->notes[1]); } |
1da177e4c Linux-2.6.12-rc2 |
1906 1907 |
return sz; } |
3aba481fc elf core dump: no... |
1908 1909 |
struct elf_note_info { struct memelfnote *notes; |
720236569 fs/binfmt_elf.c: ... |
1910 |
struct memelfnote *notes_files; |
3aba481fc elf core dump: no... |
1911 1912 1913 1914 |
struct elf_prstatus *prstatus; /* NT_PRSTATUS */ struct elf_prpsinfo *psinfo; /* NT_PRPSINFO */ struct list_head thread_list; elf_fpregset_t *fpu; |
49ae4d4b1 coredump: add a n... |
1915 |
user_siginfo_t csigdata; |
3aba481fc elf core dump: no... |
1916 1917 1918 |
int thread_status_size; int numnote; }; |
0cf062d0f elf: clean up fil... |
1919 |
static int elf_note_info_init(struct elf_note_info *info) |
3aba481fc elf core dump: no... |
1920 |
{ |
0cf062d0f elf: clean up fil... |
1921 |
memset(info, 0, sizeof(*info)); |
3aba481fc elf core dump: no... |
1922 |
INIT_LIST_HEAD(&info->thread_list); |
49ae4d4b1 coredump: add a n... |
1923 |
/* Allocate space for ELF notes */ |
6da2ec560 treewide: kmalloc... |
1924 |
info->notes = kmalloc_array(8, sizeof(struct memelfnote), GFP_KERNEL); |
3aba481fc elf core dump: no... |
1925 1926 1927 1928 |
if (!info->notes) return 0; info->psinfo = kmalloc(sizeof(*info->psinfo), GFP_KERNEL); if (!info->psinfo) |
f34f9d186 coredump: prevent... |
1929 |
return 0; |
3aba481fc elf core dump: no... |
1930 1931 |
info->prstatus = kmalloc(sizeof(*info->prstatus), GFP_KERNEL); if (!info->prstatus) |
f34f9d186 coredump: prevent... |
1932 |
return 0; |
3aba481fc elf core dump: no... |
1933 1934 |
info->fpu = kmalloc(sizeof(*info->fpu), GFP_KERNEL); if (!info->fpu) |
f34f9d186 coredump: prevent... |
1935 |
return 0; |
0cf062d0f elf: clean up fil... |
1936 |
return 1; |
0cf062d0f elf: clean up fil... |
1937 1938 1939 1940 |
} static int fill_note_info(struct elfhdr *elf, int phdrs, struct elf_note_info *info, |
cabd69640 coredump/elf: Pas... |
1941 |
struct coredump_params *cprm) |
0cf062d0f elf: clean up fil... |
1942 |
{ |
afabada95 elf{,_fdpic} core... |
1943 1944 |
struct core_thread *ct; struct elf_thread_status *ets; |
0cf062d0f elf: clean up fil... |
1945 1946 1947 |
if (!elf_note_info_init(info)) return 0; |
3aba481fc elf core dump: no... |
1948 |
|
afabada95 elf{,_fdpic} core... |
1949 1950 1951 1952 1953 |
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... |
1954 |
|
afabada95 elf{,_fdpic} core... |
1955 1956 1957 |
ets->thread = ct->task; list_add(&ets->list, &info->thread_list); } |
83914441f coredump: elf_cor... |
1958 |
|
93f044e28 fs/binfmt_elf.c: ... |
1959 |
list_for_each_entry(ets, &info->thread_list, list) { |
afabada95 elf{,_fdpic} core... |
1960 |
int sz; |
3aba481fc elf core dump: no... |
1961 |
|
cabd69640 coredump/elf: Pas... |
1962 |
sz = elf_dump_thread_status(cprm->siginfo->si_signo, ets); |
afabada95 elf{,_fdpic} core... |
1963 |
info->thread_status_size += sz; |
3aba481fc elf core dump: no... |
1964 1965 1966 |
} /* now collect the dump for the current */ memset(info->prstatus, 0, sizeof(*info->prstatus)); |
cabd69640 coredump/elf: Pas... |
1967 1968 |
fill_prstatus(&info->prstatus->common, current, cprm->siginfo->si_signo); elf_core_copy_regs(&info->prstatus->pr_reg, cprm->regs); |
3aba481fc elf core dump: no... |
1969 1970 |
/* Set up header */ |
d3330cf08 binfmt_elf: remov... |
1971 |
fill_elf_header(elf, phdrs, ELF_ARCH, ELF_CORE_EFLAGS); |
3aba481fc elf core dump: no... |
1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 |
/* * 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); |
cabd69640 coredump/elf: Pas... |
1983 |
fill_siginfo_note(info->notes + 2, &info->csigdata, cprm->siginfo); |
2aa362c49 coredump: extend ... |
1984 |
fill_auxv_note(info->notes + 3, current->mm); |
720236569 fs/binfmt_elf.c: ... |
1985 |
info->numnote = 4; |
3aba481fc elf core dump: no... |
1986 |
|
39fd0cc07 coredump: Use the... |
1987 |
if (fill_files_note(info->notes + info->numnote, cprm) == 0) { |
720236569 fs/binfmt_elf.c: ... |
1988 1989 1990 |
info->notes_files = info->notes + info->numnote; info->numnote++; } |
3aba481fc elf core dump: no... |
1991 1992 |
/* Try to dump the FPU. */ |
cabd69640 coredump/elf: Pas... |
1993 1994 |
info->prstatus->pr_fpvalid = elf_core_copy_task_fpregs(current, cprm->regs, info->fpu); |
3aba481fc elf core dump: no... |
1995 1996 1997 |
if (info->prstatus->pr_fpvalid) fill_note(info->notes + info->numnote++, "CORE", NT_PRFPREG, sizeof(*info->fpu), info->fpu); |
3aba481fc elf core dump: no... |
1998 |
return 1; |
3aba481fc elf core dump: no... |
1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 |
} 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_... |
2015 |
struct coredump_params *cprm) |
3aba481fc elf core dump: no... |
2016 |
{ |
93f044e28 fs/binfmt_elf.c: ... |
2017 |
struct elf_thread_status *ets; |
3aba481fc elf core dump: no... |
2018 |
int i; |
3aba481fc elf core dump: no... |
2019 2020 |
for (i = 0; i < info->numnote; i++) |
ecc8c7725 new helper: dump_... |
2021 |
if (!writenote(info->notes + i, cprm)) |
3aba481fc elf core dump: no... |
2022 2023 2024 |
return 0; /* write out the thread status notes section */ |
93f044e28 fs/binfmt_elf.c: ... |
2025 2026 2027 |
list_for_each_entry(ets, &info->thread_list, list) { for (i = 0; i < ets->num_notes; i++) if (!writenote(&ets->notes[i], cprm)) |
3aba481fc elf core dump: no... |
2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 |
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: ... |
2041 2042 |
/* Free data possibly allocated by fill_files_note(): */ if (info->notes_files) |
86a2bb5ad coredump: fix spa... |
2043 |
kvfree(info->notes_files->data); |
2aa362c49 coredump: extend ... |
2044 |
|
3aba481fc elf core dump: no... |
2045 2046 2047 2048 |
kfree(info->prstatus); kfree(info->psinfo); kfree(info->notes); kfree(info->fpu); |
3aba481fc elf core dump: no... |
2049 |
} |
4206d3aa1 elf core dump: no... |
2050 |
#endif |
8d9032bbe elf coredump: add... |
2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 |
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 |
2066 2067 2068 2069 2070 2071 2072 |
/* * 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... |
2073 |
static int elf_core_dump(struct coredump_params *cprm) |
1da177e4c Linux-2.6.12-rc2 |
2074 |
{ |
1da177e4c Linux-2.6.12-rc2 |
2075 |
int has_dumped = 0; |
f6ca86280 coredump: Snapsho... |
2076 |
int segs, i; |
225a3f53e fs/binfmt_elf.c: ... |
2077 |
struct elfhdr elf; |
cdc3d5627 switch elf_coredu... |
2078 |
loff_t offset = 0, dataoff; |
720236569 fs/binfmt_elf.c: ... |
2079 |
struct elf_note_info info = { }; |
93eb211e6 elf coredump: mak... |
2080 |
struct elf_phdr *phdr4note = NULL; |
8d9032bbe elf coredump: add... |
2081 2082 2083 |
struct elf_shdr *shdr4extnum = NULL; Elf_Half e_phnum; elf_addr_t e_shoff; |
1da177e4c Linux-2.6.12-rc2 |
2084 |
|
341c87bf3 elf: limit max ma... |
2085 2086 2087 2088 |
/* * The number of segs are recored into ELF header as 16bit value. * Please check DEFAULT_MAX_MAP_COUNT definition when you modify here. */ |
f6ca86280 coredump: Snapsho... |
2089 |
segs = cprm->vma_count + elf_core_extra_phdrs(); |
f47aef55d [PATCH] i386 vDSO... |
2090 |
|
8d9032bbe elf coredump: add... |
2091 2092 2093 2094 2095 2096 2097 |
/* 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 |
2098 |
/* |
3aba481fc elf core dump: no... |
2099 2100 |
* 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 |
2101 |
*/ |
cabd69640 coredump/elf: Pas... |
2102 |
if (!fill_note_info(&elf, e_phnum, &info, cprm)) |
d2530b436 binfmt_elf: remov... |
2103 |
goto end_coredump; |
1da177e4c Linux-2.6.12-rc2 |
2104 |
|
3aba481fc elf core dump: no... |
2105 |
has_dumped = 1; |
079148b91 coredump: factor ... |
2106 |
|
225a3f53e fs/binfmt_elf.c: ... |
2107 |
offset += sizeof(elf); /* Elf header */ |
8d9032bbe elf coredump: add... |
2108 |
offset += segs * sizeof(struct elf_phdr); /* Program headers */ |
1da177e4c Linux-2.6.12-rc2 |
2109 2110 2111 |
/* Write notes phdr entry */ { |
3aba481fc elf core dump: no... |
2112 |
size_t sz = get_note_info_size(&info); |
1da177e4c Linux-2.6.12-rc2 |
2113 |
|
c39ab6de2 coredump: Documen... |
2114 |
/* For cell spufs */ |
e55014923 [POWERPC] spufs: ... |
2115 |
sz += elf_coredump_extra_notes_size(); |
bf1ab978b [POWERPC] coredum... |
2116 |
|
93eb211e6 elf coredump: mak... |
2117 2118 |
phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL); if (!phdr4note) |
088e7af73 coredump: move du... |
2119 |
goto end_coredump; |
93eb211e6 elf coredump: mak... |
2120 2121 2122 |
fill_elf_note_phdr(phdr4note, sz, offset); offset += sz; |
1da177e4c Linux-2.6.12-rc2 |
2123 |
} |
1da177e4c Linux-2.6.12-rc2 |
2124 |
dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); |
f6ca86280 coredump: Snapsho... |
2125 |
offset += cprm->vma_data_size; |
8d9032bbe elf coredump: add... |
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; |
225a3f53e fs/binfmt_elf.c: ... |
2133 |
fill_extnum_info(&elf, shdr4extnum, e_shoff, segs); |
8d9032bbe elf coredump: add... |
2134 2135 2136 |
} offset = dataoff; |
225a3f53e fs/binfmt_elf.c: ... |
2137 |
if (!dump_emit(cprm, &elf, sizeof(elf))) |
93eb211e6 elf coredump: mak... |
2138 |
goto end_coredump; |
ecc8c7725 new helper: dump_... |
2139 |
if (!dump_emit(cprm, phdr4note, sizeof(*phdr4note))) |
93eb211e6 elf coredump: mak... |
2140 |
goto end_coredump; |
1da177e4c Linux-2.6.12-rc2 |
2141 |
/* Write program headers for segments dump */ |
f6ca86280 coredump: Snapsho... |
2142 2143 |
for (i = 0; i < cprm->vma_count; i++) { struct core_vma_metadata *meta = cprm->vma_meta + i; |
1da177e4c Linux-2.6.12-rc2 |
2144 |
struct elf_phdr phdr; |
1da177e4c Linux-2.6.12-rc2 |
2145 2146 2147 |
phdr.p_type = PT_LOAD; phdr.p_offset = offset; |
a07279c9a binfmt_elf, binfm... |
2148 |
phdr.p_vaddr = meta->start; |
1da177e4c Linux-2.6.12-rc2 |
2149 |
phdr.p_paddr = 0; |
a07279c9a binfmt_elf, binfm... |
2150 2151 |
phdr.p_filesz = meta->dump_size; phdr.p_memsz = meta->end - meta->start; |
1da177e4c Linux-2.6.12-rc2 |
2152 |
offset += phdr.p_filesz; |
a07279c9a binfmt_elf, binfm... |
2153 2154 2155 2156 |
phdr.p_flags = 0; if (meta->flags & VM_READ) phdr.p_flags |= PF_R; if (meta->flags & VM_WRITE) |
f4e5cc2c4 [PATCH] binfmt_el... |
2157 |
phdr.p_flags |= PF_W; |
a07279c9a binfmt_elf, binfm... |
2158 |
if (meta->flags & VM_EXEC) |
f4e5cc2c4 [PATCH] binfmt_el... |
2159 |
phdr.p_flags |= PF_X; |
1da177e4c Linux-2.6.12-rc2 |
2160 |
phdr.p_align = ELF_EXEC_PAGESIZE; |
ecc8c7725 new helper: dump_... |
2161 |
if (!dump_emit(cprm, &phdr, sizeof(phdr))) |
088e7af73 coredump: move du... |
2162 |
goto end_coredump; |
1da177e4c Linux-2.6.12-rc2 |
2163 |
} |
506f21c55 switch elf_core_w... |
2164 |
if (!elf_core_write_extra_phdrs(cprm, offset)) |
1fcccbac8 elf coredump: rep... |
2165 |
goto end_coredump; |
1da177e4c Linux-2.6.12-rc2 |
2166 2167 |
/* write out the notes section */ |
ecc8c7725 new helper: dump_... |
2168 |
if (!write_note_info(&info, cprm)) |
3aba481fc elf core dump: no... |
2169 |
goto end_coredump; |
1da177e4c Linux-2.6.12-rc2 |
2170 |
|
c39ab6de2 coredump: Documen... |
2171 |
/* For cell spufs */ |
cdc3d5627 switch elf_coredu... |
2172 |
if (elf_coredump_extra_notes_write(cprm)) |
e55014923 [POWERPC] spufs: ... |
2173 |
goto end_coredump; |
bf1ab978b [POWERPC] coredum... |
2174 |
|
d025c9db7 [PATCH] Support p... |
2175 |
/* Align to page */ |
d0f1088b3 coredump: don't b... |
2176 |
dump_skip_to(cprm, dataoff); |
1da177e4c Linux-2.6.12-rc2 |
2177 |
|
f6ca86280 coredump: Snapsho... |
2178 2179 |
for (i = 0; i < cprm->vma_count; i++) { struct core_vma_metadata *meta = cprm->vma_meta + i; |
a07279c9a binfmt_elf, binfm... |
2180 2181 |
if (!dump_user_range(cprm, meta->start, meta->dump_size)) |
afc63a97b coredump: refacto... |
2182 |
goto end_coredump; |
1da177e4c Linux-2.6.12-rc2 |
2183 |
} |
aa3e7eaf0 switch elf_core_w... |
2184 |
if (!elf_core_write_extra_data(cprm)) |
1fcccbac8 elf coredump: rep... |
2185 |
goto end_coredump; |
1da177e4c Linux-2.6.12-rc2 |
2186 |
|
8d9032bbe elf coredump: add... |
2187 |
if (e_phnum == PN_XNUM) { |
13046ece9 binfmt_elf: conve... |
2188 |
if (!dump_emit(cprm, shdr4extnum, sizeof(*shdr4extnum))) |
8d9032bbe elf coredump: add... |
2189 2190 |
goto end_coredump; } |
1da177e4c Linux-2.6.12-rc2 |
2191 |
end_coredump: |
3aba481fc elf core dump: no... |
2192 |
free_note_info(&info); |
8d9032bbe elf coredump: add... |
2193 |
kfree(shdr4extnum); |
93eb211e6 elf coredump: mak... |
2194 |
kfree(phdr4note); |
1da177e4c Linux-2.6.12-rc2 |
2195 |
return has_dumped; |
1da177e4c Linux-2.6.12-rc2 |
2196 |
} |
698ba7b5a elf: kill USE_ELF... |
2197 |
#endif /* CONFIG_ELF_CORE */ |
1da177e4c Linux-2.6.12-rc2 |
2198 2199 2200 |
static int __init init_elf_binfmt(void) { |
8fc3dc5a3 __register_binfmt... |
2201 2202 |
register_binfmt(&elf_format); return 0; |
1da177e4c Linux-2.6.12-rc2 |
2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 |
} 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"); |