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fs/exec.c
44.3 KB
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/* * linux/fs/exec.c * * Copyright (C) 1991, 1992 Linus Torvalds */ /* * #!-checking implemented by tytso. */ /* * Demand-loading implemented 01.12.91 - no need to read anything but * the header into memory. The inode of the executable is put into * "current->executable", and page faults do the actual loading. Clean. * * Once more I can proudly say that linux stood up to being changed: it * was less than 2 hours work to get demand-loading completely implemented. * * Demand loading changed July 1993 by Eric Youngdale. Use mmap instead, * current->executable is only used by the procfs. This allows a dispatch * table to check for several different types of binary formats. We keep * trying until we recognize the file or we run out of supported binary |
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* formats. |
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*/ |
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#include <linux/slab.h> #include <linux/file.h> |
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#include <linux/fdtable.h> |
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#include <linux/mm.h> |
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#include <linux/vmacache.h> |
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#include <linux/stat.h> #include <linux/fcntl.h> |
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#include <linux/swap.h> |
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#include <linux/string.h> |
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#include <linux/init.h> |
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#include <linux/pagemap.h> |
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#include <linux/perf_event.h> |
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#include <linux/highmem.h> #include <linux/spinlock.h> #include <linux/key.h> #include <linux/personality.h> #include <linux/binfmts.h> |
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#include <linux/utsname.h> |
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#include <linux/pid_namespace.h> |
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#include <linux/module.h> #include <linux/namei.h> |
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#include <linux/mount.h> #include <linux/security.h> #include <linux/syscalls.h> |
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#include <linux/tsacct_kern.h> |
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#include <linux/cn_proc.h> |
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#include <linux/audit.h> |
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#include <linux/tracehook.h> |
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#include <linux/kmod.h> |
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#include <linux/fsnotify.h> |
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#include <linux/fs_struct.h> |
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#include <linux/pipe_fs_i.h> |
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#include <linux/oom.h> |
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#include <linux/compat.h> |
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#include <linux/vmalloc.h> |
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#include <asm/uaccess.h> #include <asm/mmu_context.h> |
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#include <asm/tlb.h> |
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#include <trace/events/task.h> |
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#include "internal.h" |
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|
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#include <trace/events/sched.h> |
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int suid_dumpable = 0; |
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static LIST_HEAD(formats); |
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static DEFINE_RWLOCK(binfmt_lock); |
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void __register_binfmt(struct linux_binfmt * fmt, int insert) |
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{ |
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BUG_ON(!fmt); |
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if (WARN_ON(!fmt->load_binary)) return; |
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write_lock(&binfmt_lock); |
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insert ? list_add(&fmt->lh, &formats) : list_add_tail(&fmt->lh, &formats); |
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write_unlock(&binfmt_lock); |
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} |
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EXPORT_SYMBOL(__register_binfmt); |
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|
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void unregister_binfmt(struct linux_binfmt * fmt) |
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{ |
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write_lock(&binfmt_lock); |
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list_del(&fmt->lh); |
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write_unlock(&binfmt_lock); |
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} EXPORT_SYMBOL(unregister_binfmt); static inline void put_binfmt(struct linux_binfmt * fmt) { module_put(fmt->module); } |
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bool path_noexec(const struct path *path) { return (path->mnt->mnt_flags & MNT_NOEXEC) || (path->mnt->mnt_sb->s_iflags & SB_I_NOEXEC); } |
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#ifdef CONFIG_USELIB |
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/* * Note that a shared library must be both readable and executable due to * security reasons. * * Also note that we take the address to load from from the file itself. */ |
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SYSCALL_DEFINE1(uselib, const char __user *, library) |
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{ |
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struct linux_binfmt *fmt; |
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struct file *file; |
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struct filename *tmp = getname(library); |
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int error = PTR_ERR(tmp); |
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static const struct open_flags uselib_flags = { .open_flag = O_LARGEFILE | O_RDONLY | __FMODE_EXEC, |
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.acc_mode = MAY_READ | MAY_EXEC, |
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.intent = LOOKUP_OPEN, .lookup_flags = LOOKUP_FOLLOW, |
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}; |
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|
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if (IS_ERR(tmp)) goto out; |
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file = do_filp_open(AT_FDCWD, tmp, &uselib_flags); |
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putname(tmp); error = PTR_ERR(file); if (IS_ERR(file)) |
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goto out; error = -EINVAL; |
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if (!S_ISREG(file_inode(file)->i_mode)) |
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goto exit; |
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error = -EACCES; |
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if (path_noexec(&file->f_path)) |
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goto exit; |
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|
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fsnotify_open(file); |
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|
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error = -ENOEXEC; |
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|
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read_lock(&binfmt_lock); list_for_each_entry(fmt, &formats, lh) { if (!fmt->load_shlib) continue; if (!try_module_get(fmt->module)) continue; |
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read_unlock(&binfmt_lock); |
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error = fmt->load_shlib(file); read_lock(&binfmt_lock); put_binfmt(fmt); if (error != -ENOEXEC) break; |
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} |
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read_unlock(&binfmt_lock); |
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exit: |
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fput(file); out: return error; |
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} |
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#endif /* #ifdef CONFIG_USELIB */ |
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|
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#ifdef CONFIG_MMU |
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/* * The nascent bprm->mm is not visible until exec_mmap() but it can * use a lot of memory, account these pages in current->mm temporary * for oom_badness()->get_mm_rss(). Once exec succeeds or fails, we * change the counter back via acct_arg_size(0). */ |
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static void acct_arg_size(struct linux_binprm *bprm, unsigned long pages) |
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{ struct mm_struct *mm = current->mm; long diff = (long)(pages - bprm->vma_pages); if (!mm || !diff) return; bprm->vma_pages = pages; |
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add_mm_counter(mm, MM_ANONPAGES, diff); |
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} |
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static struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos, |
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int write) { struct page *page; int ret; |
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unsigned int gup_flags = FOLL_FORCE; |
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#ifdef CONFIG_STACK_GROWSUP if (write) { |
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ret = expand_downwards(bprm->vma, pos); |
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if (ret < 0) return NULL; } #endif |
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if (write) gup_flags |= FOLL_WRITE; |
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/* * We are doing an exec(). 'current' is the process * doing the exec and bprm->mm is the new process's mm. */ |
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ret = get_user_pages_remote(current, bprm->mm, pos, 1, gup_flags, &page, NULL); |
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if (ret <= 0) return NULL; if (write) { |
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unsigned long size = bprm->vma->vm_end - bprm->vma->vm_start; |
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struct rlimit *rlim; |
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acct_arg_size(bprm, size / PAGE_SIZE); |
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/* * We've historically supported up to 32 pages (ARG_MAX) * of argument strings even with small stacks */ if (size <= ARG_MAX) return page; |
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/* * Limit to 1/4-th the stack size for the argv+env strings. * This ensures that: * - the remaining binfmt code will not run out of stack space, * - the program will have a reasonable amount of stack left * to work from. */ |
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rlim = current->signal->rlim; |
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if (size > ACCESS_ONCE(rlim[RLIMIT_STACK].rlim_cur) / 4) { |
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put_page(page); return NULL; } } return page; } static void put_arg_page(struct page *page) { put_page(page); } |
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static void free_arg_pages(struct linux_binprm *bprm) { } static void flush_arg_page(struct linux_binprm *bprm, unsigned long pos, struct page *page) { flush_cache_page(bprm->vma, pos, page_to_pfn(page)); } static int __bprm_mm_init(struct linux_binprm *bprm) { |
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int err; |
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struct vm_area_struct *vma = NULL; struct mm_struct *mm = bprm->mm; bprm->vma = vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL); if (!vma) |
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return -ENOMEM; |
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|
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if (down_write_killable(&mm->mmap_sem)) { err = -EINTR; goto err_free; } |
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vma->vm_mm = mm; /* * Place the stack at the largest stack address the architecture * supports. Later, we'll move this to an appropriate place. We don't * use STACK_TOP because that can depend on attributes which aren't * configured yet. */ |
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BUILD_BUG_ON(VM_STACK_FLAGS & VM_STACK_INCOMPLETE_SETUP); |
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vma->vm_end = STACK_TOP_MAX; vma->vm_start = vma->vm_end - PAGE_SIZE; |
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vma->vm_flags = VM_SOFTDIRTY | VM_STACK_FLAGS | VM_STACK_INCOMPLETE_SETUP; |
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vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); |
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INIT_LIST_HEAD(&vma->anon_vma_chain); |
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|
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err = insert_vm_struct(mm, vma); |
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if (err) |
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goto err; |
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mm->stack_vm = mm->total_vm = 1; |
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arch_bprm_mm_init(mm, vma); |
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up_write(&mm->mmap_sem); |
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bprm->p = vma->vm_end - sizeof(void *); |
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return 0; |
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err: |
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up_write(&mm->mmap_sem); |
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err_free: |
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bprm->vma = NULL; kmem_cache_free(vm_area_cachep, vma); |
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return err; } static bool valid_arg_len(struct linux_binprm *bprm, long len) { return len <= MAX_ARG_STRLEN; } #else |
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static inline void acct_arg_size(struct linux_binprm *bprm, unsigned long pages) |
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{ } |
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static struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos, |
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int write) { struct page *page; page = bprm->page[pos / PAGE_SIZE]; if (!page && write) { page = alloc_page(GFP_HIGHUSER|__GFP_ZERO); if (!page) return NULL; bprm->page[pos / PAGE_SIZE] = page; } return page; } static void put_arg_page(struct page *page) { } static void free_arg_page(struct linux_binprm *bprm, int i) { if (bprm->page[i]) { __free_page(bprm->page[i]); bprm->page[i] = NULL; } } static void free_arg_pages(struct linux_binprm *bprm) { int i; for (i = 0; i < MAX_ARG_PAGES; i++) free_arg_page(bprm, i); } static void flush_arg_page(struct linux_binprm *bprm, unsigned long pos, struct page *page) { } static int __bprm_mm_init(struct linux_binprm *bprm) { bprm->p = PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *); return 0; } static bool valid_arg_len(struct linux_binprm *bprm, long len) { return len <= bprm->p; } #endif /* CONFIG_MMU */ /* * Create a new mm_struct and populate it with a temporary stack * vm_area_struct. We don't have enough context at this point to set the stack * flags, permissions, and offset, so we use temporary values. We'll update * them later in setup_arg_pages(). */ |
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static int bprm_mm_init(struct linux_binprm *bprm) |
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{ int err; struct mm_struct *mm = NULL; bprm->mm = mm = mm_alloc(); err = -ENOMEM; if (!mm) goto err; |
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err = __bprm_mm_init(bprm); if (err) goto err; return 0; err: if (mm) { bprm->mm = NULL; mmdrop(mm); } return err; } |
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struct user_arg_ptr { |
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#ifdef CONFIG_COMPAT bool is_compat; #endif union { const char __user *const __user *native; #ifdef CONFIG_COMPAT |
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const compat_uptr_t __user *compat; |
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#endif } ptr; |
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}; static const char __user *get_user_arg_ptr(struct user_arg_ptr argv, int nr) |
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{ |
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const char __user *native; #ifdef CONFIG_COMPAT if (unlikely(argv.is_compat)) { compat_uptr_t compat; if (get_user(compat, argv.ptr.compat + nr)) return ERR_PTR(-EFAULT); |
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|
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return compat_ptr(compat); } #endif if (get_user(native, argv.ptr.native + nr)) |
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return ERR_PTR(-EFAULT); |
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return native; |
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415 |
} |
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/* * count() counts the number of strings in array ARGV. */ |
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static int count(struct user_arg_ptr argv, int max) |
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{ int i = 0; |
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if (argv.ptr.native != NULL) { |
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for (;;) { |
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const char __user *p = get_user_arg_ptr(argv, i); |
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|
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if (!p) break; |
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if (IS_ERR(p)) return -EFAULT; |
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if (i >= max) |
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return -E2BIG; |
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++i; |
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if (fatal_signal_pending(current)) return -ERESTARTNOHAND; |
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cond_resched(); } } return i; } /* |
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* 'copy_strings()' copies argument/environment strings from the old * processes's memory to the new process's stack. The call to get_user_pages() * ensures the destination page is created and not swapped out. |
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447 |
*/ |
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static int copy_strings(int argc, struct user_arg_ptr argv, |
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struct linux_binprm *bprm) |
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{ struct page *kmapped_page = NULL; char *kaddr = NULL; |
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unsigned long kpos = 0; |
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int ret; while (argc-- > 0) { |
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const char __user *str; |
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int len; unsigned long pos; |
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ret = -EFAULT; str = get_user_arg_ptr(argv, argc); if (IS_ERR(str)) |
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goto out; |
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|
1d1dbf813 exec: introduce g... |
465 466 467 468 469 470 |
len = strnlen_user(str, MAX_ARG_STRLEN); if (!len) goto out; ret = -E2BIG; if (!valid_arg_len(bprm, len)) |
1da177e4c Linux-2.6.12-rc2 |
471 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
472 |
|
b6a2fea39 mm: variable leng... |
473 |
/* We're going to work our way backwords. */ |
1da177e4c Linux-2.6.12-rc2 |
474 |
pos = bprm->p; |
b6a2fea39 mm: variable leng... |
475 476 |
str += len; bprm->p -= len; |
1da177e4c Linux-2.6.12-rc2 |
477 478 |
while (len > 0) { |
1da177e4c Linux-2.6.12-rc2 |
479 |
int offset, bytes_to_copy; |
1da177e4c Linux-2.6.12-rc2 |
480 |
|
9aea5a65a execve: make resp... |
481 482 483 484 |
if (fatal_signal_pending(current)) { ret = -ERESTARTNOHAND; goto out; } |
7993bc1f4 execve: improve i... |
485 |
cond_resched(); |
1da177e4c Linux-2.6.12-rc2 |
486 |
offset = pos % PAGE_SIZE; |
b6a2fea39 mm: variable leng... |
487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 |
if (offset == 0) offset = PAGE_SIZE; bytes_to_copy = offset; if (bytes_to_copy > len) bytes_to_copy = len; offset -= bytes_to_copy; pos -= bytes_to_copy; str -= bytes_to_copy; len -= bytes_to_copy; if (!kmapped_page || kpos != (pos & PAGE_MASK)) { struct page *page; page = get_arg_page(bprm, pos, 1); |
1da177e4c Linux-2.6.12-rc2 |
503 |
if (!page) { |
b6a2fea39 mm: variable leng... |
504 |
ret = -E2BIG; |
1da177e4c Linux-2.6.12-rc2 |
505 506 |
goto out; } |
1da177e4c Linux-2.6.12-rc2 |
507 |
|
b6a2fea39 mm: variable leng... |
508 509 |
if (kmapped_page) { flush_kernel_dcache_page(kmapped_page); |
1da177e4c Linux-2.6.12-rc2 |
510 |
kunmap(kmapped_page); |
b6a2fea39 mm: variable leng... |
511 512 |
put_arg_page(kmapped_page); } |
1da177e4c Linux-2.6.12-rc2 |
513 514 |
kmapped_page = page; kaddr = kmap(kmapped_page); |
b6a2fea39 mm: variable leng... |
515 516 |
kpos = pos & PAGE_MASK; flush_arg_page(bprm, kpos, kmapped_page); |
1da177e4c Linux-2.6.12-rc2 |
517 |
} |
b6a2fea39 mm: variable leng... |
518 |
if (copy_from_user(kaddr+offset, str, bytes_to_copy)) { |
1da177e4c Linux-2.6.12-rc2 |
519 520 521 |
ret = -EFAULT; goto out; } |
1da177e4c Linux-2.6.12-rc2 |
522 523 524 525 |
} } ret = 0; out: |
b6a2fea39 mm: variable leng... |
526 527 |
if (kmapped_page) { flush_kernel_dcache_page(kmapped_page); |
1da177e4c Linux-2.6.12-rc2 |
528 |
kunmap(kmapped_page); |
b6a2fea39 mm: variable leng... |
529 530 |
put_arg_page(kmapped_page); } |
1da177e4c Linux-2.6.12-rc2 |
531 532 533 534 535 536 |
return ret; } /* * Like copy_strings, but get argv and its values from kernel memory. */ |
ba2d01629 exec: introduce s... |
537 |
int copy_strings_kernel(int argc, const char *const *__argv, |
d7627467b Make do_execve() ... |
538 |
struct linux_binprm *bprm) |
1da177e4c Linux-2.6.12-rc2 |
539 540 541 |
{ int r; mm_segment_t oldfs = get_fs(); |
ba2d01629 exec: introduce s... |
542 |
struct user_arg_ptr argv = { |
0e028465d exec: unify do_ex... |
543 |
.ptr.native = (const char __user *const __user *)__argv, |
ba2d01629 exec: introduce s... |
544 |
}; |
1da177e4c Linux-2.6.12-rc2 |
545 |
set_fs(KERNEL_DS); |
ba2d01629 exec: introduce s... |
546 |
r = copy_strings(argc, argv, bprm); |
1da177e4c Linux-2.6.12-rc2 |
547 |
set_fs(oldfs); |
ba2d01629 exec: introduce s... |
548 |
|
1da177e4c Linux-2.6.12-rc2 |
549 550 |
return r; } |
1da177e4c Linux-2.6.12-rc2 |
551 552 553 |
EXPORT_SYMBOL(copy_strings_kernel); #ifdef CONFIG_MMU |
b6a2fea39 mm: variable leng... |
554 |
|
1da177e4c Linux-2.6.12-rc2 |
555 |
/* |
b6a2fea39 mm: variable leng... |
556 557 558 |
* During bprm_mm_init(), we create a temporary stack at STACK_TOP_MAX. Once * the binfmt code determines where the new stack should reside, we shift it to * its final location. The process proceeds as follows: |
1da177e4c Linux-2.6.12-rc2 |
559 |
* |
b6a2fea39 mm: variable leng... |
560 561 562 563 564 565 |
* 1) Use shift to calculate the new vma endpoints. * 2) Extend vma to cover both the old and new ranges. This ensures the * arguments passed to subsequent functions are consistent. * 3) Move vma's page tables to the new range. * 4) Free up any cleared pgd range. * 5) Shrink the vma to cover only the new range. |
1da177e4c Linux-2.6.12-rc2 |
566 |
*/ |
b6a2fea39 mm: variable leng... |
567 |
static int shift_arg_pages(struct vm_area_struct *vma, unsigned long shift) |
1da177e4c Linux-2.6.12-rc2 |
568 569 |
{ struct mm_struct *mm = vma->vm_mm; |
b6a2fea39 mm: variable leng... |
570 571 572 573 574 |
unsigned long old_start = vma->vm_start; unsigned long old_end = vma->vm_end; unsigned long length = old_end - old_start; unsigned long new_start = old_start - shift; unsigned long new_end = old_end - shift; |
d16dfc550 mm: mmu_gather re... |
575 |
struct mmu_gather tlb; |
1da177e4c Linux-2.6.12-rc2 |
576 |
|
b6a2fea39 mm: variable leng... |
577 |
BUG_ON(new_start > new_end); |
1da177e4c Linux-2.6.12-rc2 |
578 |
|
b6a2fea39 mm: variable leng... |
579 580 581 582 583 584 585 586 587 588 |
/* * ensure there are no vmas between where we want to go * and where we are */ if (vma != find_vma(mm, new_start)) return -EFAULT; /* * cover the whole range: [new_start, old_end) */ |
5beb49305 mm: change anon_v... |
589 590 |
if (vma_adjust(vma, new_start, old_end, vma->vm_pgoff, NULL)) return -ENOMEM; |
b6a2fea39 mm: variable leng... |
591 592 593 594 595 596 |
/* * move the page tables downwards, on failure we rely on * process cleanup to remove whatever mess we made. */ if (length != move_page_tables(vma, old_start, |
38a76013a mm: avoid taking ... |
597 |
vma, new_start, length, false)) |
b6a2fea39 mm: variable leng... |
598 599 600 |
return -ENOMEM; lru_add_drain(); |
2b047252d Fix TLB gather vi... |
601 |
tlb_gather_mmu(&tlb, mm, old_start, old_end); |
b6a2fea39 mm: variable leng... |
602 603 604 605 |
if (new_end > old_start) { /* * when the old and new regions overlap clear from new_end. */ |
d16dfc550 mm: mmu_gather re... |
606 |
free_pgd_range(&tlb, new_end, old_end, new_end, |
6ee8630e0 mm: allow arch co... |
607 |
vma->vm_next ? vma->vm_next->vm_start : USER_PGTABLES_CEILING); |
b6a2fea39 mm: variable leng... |
608 609 610 611 612 613 614 |
} else { /* * otherwise, clean from old_start; this is done to not touch * the address space in [new_end, old_start) some architectures * have constraints on va-space that make this illegal (IA64) - * for the others its just a little faster. */ |
d16dfc550 mm: mmu_gather re... |
615 |
free_pgd_range(&tlb, old_start, old_end, new_end, |
6ee8630e0 mm: allow arch co... |
616 |
vma->vm_next ? vma->vm_next->vm_start : USER_PGTABLES_CEILING); |
1da177e4c Linux-2.6.12-rc2 |
617 |
} |
2b047252d Fix TLB gather vi... |
618 |
tlb_finish_mmu(&tlb, old_start, old_end); |
b6a2fea39 mm: variable leng... |
619 620 |
/* |
5beb49305 mm: change anon_v... |
621 |
* Shrink the vma to just the new range. Always succeeds. |
b6a2fea39 mm: variable leng... |
622 623 624 625 |
*/ vma_adjust(vma, new_start, new_end, vma->vm_pgoff, NULL); return 0; |
1da177e4c Linux-2.6.12-rc2 |
626 |
} |
b6a2fea39 mm: variable leng... |
627 628 629 630 |
/* * Finalizes the stack vm_area_struct. The flags and permissions are updated, * the stack is optionally relocated, and some extra space is added. */ |
1da177e4c Linux-2.6.12-rc2 |
631 632 633 634 |
int setup_arg_pages(struct linux_binprm *bprm, unsigned long stack_top, int executable_stack) { |
b6a2fea39 mm: variable leng... |
635 636 |
unsigned long ret; unsigned long stack_shift; |
1da177e4c Linux-2.6.12-rc2 |
637 |
struct mm_struct *mm = current->mm; |
b6a2fea39 mm: variable leng... |
638 639 640 641 |
struct vm_area_struct *vma = bprm->vma; struct vm_area_struct *prev = NULL; unsigned long vm_flags; unsigned long stack_base; |
803bf5ec2 fs/exec.c: restri... |
642 643 644 |
unsigned long stack_size; unsigned long stack_expand; unsigned long rlim_stack; |
1da177e4c Linux-2.6.12-rc2 |
645 646 |
#ifdef CONFIG_STACK_GROWSUP |
d71f290b4 metag: Reduce max... |
647 |
/* Limit stack size */ |
d554ed895 fs: use rlimit he... |
648 |
stack_base = rlimit_max(RLIMIT_STACK); |
d71f290b4 metag: Reduce max... |
649 650 |
if (stack_base > STACK_SIZE_MAX) stack_base = STACK_SIZE_MAX; |
1da177e4c Linux-2.6.12-rc2 |
651 |
|
d045c77c1 parisc,metag: Fix... |
652 653 |
/* Add space for stack randomization. */ stack_base += (STACK_RND_MASK << PAGE_SHIFT); |
b6a2fea39 mm: variable leng... |
654 655 656 |
/* Make sure we didn't let the argument array grow too large. */ if (vma->vm_end - vma->vm_start > stack_base) return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
657 |
|
b6a2fea39 mm: variable leng... |
658 |
stack_base = PAGE_ALIGN(stack_top - stack_base); |
1da177e4c Linux-2.6.12-rc2 |
659 |
|
b6a2fea39 mm: variable leng... |
660 661 662 |
stack_shift = vma->vm_start - stack_base; mm->arg_start = bprm->p - stack_shift; bprm->p = vma->vm_end - stack_shift; |
1da177e4c Linux-2.6.12-rc2 |
663 |
#else |
b6a2fea39 mm: variable leng... |
664 665 |
stack_top = arch_align_stack(stack_top); stack_top = PAGE_ALIGN(stack_top); |
1b528181b setup_arg_pages: ... |
666 667 668 669 |
if (unlikely(stack_top < mmap_min_addr) || unlikely(vma->vm_end - vma->vm_start >= stack_top - mmap_min_addr)) return -ENOMEM; |
b6a2fea39 mm: variable leng... |
670 671 672 |
stack_shift = vma->vm_end - stack_top; bprm->p -= stack_shift; |
1da177e4c Linux-2.6.12-rc2 |
673 |
mm->arg_start = bprm->p; |
1da177e4c Linux-2.6.12-rc2 |
674 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
675 |
if (bprm->loader) |
b6a2fea39 mm: variable leng... |
676 677 |
bprm->loader -= stack_shift; bprm->exec -= stack_shift; |
1da177e4c Linux-2.6.12-rc2 |
678 |
|
f268dfe90 exec: make exec p... |
679 680 |
if (down_write_killable(&mm->mmap_sem)) return -EINTR; |
96a8e13ed exec: fix stack e... |
681 |
vm_flags = VM_STACK_FLAGS; |
b6a2fea39 mm: variable leng... |
682 683 684 685 686 687 688 689 690 691 692 |
/* * Adjust stack execute permissions; explicitly enable for * EXSTACK_ENABLE_X, disable for EXSTACK_DISABLE_X and leave alone * (arch default) otherwise. */ if (unlikely(executable_stack == EXSTACK_ENABLE_X)) vm_flags |= VM_EXEC; else if (executable_stack == EXSTACK_DISABLE_X) vm_flags &= ~VM_EXEC; vm_flags |= mm->def_flags; |
a8bef8ff6 mm: migration: av... |
693 |
vm_flags |= VM_STACK_INCOMPLETE_SETUP; |
b6a2fea39 mm: variable leng... |
694 695 696 697 698 699 700 701 702 703 |
ret = mprotect_fixup(vma, &prev, vma->vm_start, vma->vm_end, vm_flags); if (ret) goto out_unlock; BUG_ON(prev != vma); /* Move stack pages down in memory. */ if (stack_shift) { ret = shift_arg_pages(vma, stack_shift); |
fc63cf237 exec: setup_arg_p... |
704 705 |
if (ret) goto out_unlock; |
1da177e4c Linux-2.6.12-rc2 |
706 |
} |
a8bef8ff6 mm: migration: av... |
707 708 |
/* mprotect_fixup is overkill to remove the temporary stack flags */ vma->vm_flags &= ~VM_STACK_INCOMPLETE_SETUP; |
5ef097dd7 exec: create init... |
709 |
stack_expand = 131072UL; /* randomly 32*4k (or 2*64k) pages */ |
803bf5ec2 fs/exec.c: restri... |
710 711 712 713 714 715 |
stack_size = vma->vm_end - vma->vm_start; /* * Align this down to a page boundary as expand_stack * will align it up. */ rlim_stack = rlimit(RLIMIT_STACK) & PAGE_MASK; |
b6a2fea39 mm: variable leng... |
716 |
#ifdef CONFIG_STACK_GROWSUP |
803bf5ec2 fs/exec.c: restri... |
717 718 719 720 |
if (stack_size + stack_expand > rlim_stack) stack_base = vma->vm_start + rlim_stack; else stack_base = vma->vm_end + stack_expand; |
b6a2fea39 mm: variable leng... |
721 |
#else |
803bf5ec2 fs/exec.c: restri... |
722 723 724 725 |
if (stack_size + stack_expand > rlim_stack) stack_base = vma->vm_end - rlim_stack; else stack_base = vma->vm_start - stack_expand; |
b6a2fea39 mm: variable leng... |
726 |
#endif |
3af9e8592 perf: Add non-exe... |
727 |
current->mm->start_stack = bprm->p; |
b6a2fea39 mm: variable leng... |
728 729 730 731 732 |
ret = expand_stack(vma, stack_base); if (ret) ret = -EFAULT; out_unlock: |
1da177e4c Linux-2.6.12-rc2 |
733 |
up_write(&mm->mmap_sem); |
fc63cf237 exec: setup_arg_p... |
734 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
735 |
} |
1da177e4c Linux-2.6.12-rc2 |
736 |
EXPORT_SYMBOL(setup_arg_pages); |
7e7ec6a93 elf_fdpic_transfe... |
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 |
#else /* * Transfer the program arguments and environment from the holding pages * onto the stack. The provided stack pointer is adjusted accordingly. */ int transfer_args_to_stack(struct linux_binprm *bprm, unsigned long *sp_location) { unsigned long index, stop, sp; int ret = 0; stop = bprm->p >> PAGE_SHIFT; sp = *sp_location; for (index = MAX_ARG_PAGES - 1; index >= stop; index--) { unsigned int offset = index == stop ? bprm->p & ~PAGE_MASK : 0; char *src = kmap(bprm->page[index]) + offset; sp -= PAGE_SIZE - offset; if (copy_to_user((void *) sp, src, PAGE_SIZE - offset) != 0) ret = -EFAULT; kunmap(bprm->page[index]); if (ret) goto out; } *sp_location = sp; out: return ret; } EXPORT_SYMBOL(transfer_args_to_stack); |
1da177e4c Linux-2.6.12-rc2 |
769 |
#endif /* CONFIG_MMU */ |
51f39a1f0 syscalls: impleme... |
770 |
static struct file *do_open_execat(int fd, struct filename *name, int flags) |
1da177e4c Linux-2.6.12-rc2 |
771 |
{ |
1da177e4c Linux-2.6.12-rc2 |
772 |
struct file *file; |
e56b6a5dd Re: [PATCH 3/6] v... |
773 |
int err; |
51f39a1f0 syscalls: impleme... |
774 |
struct open_flags open_exec_flags = { |
47c805dc2 switch do_filp_op... |
775 |
.open_flag = O_LARGEFILE | O_RDONLY | __FMODE_EXEC, |
62fb4a155 don't carry MAY_O... |
776 |
.acc_mode = MAY_EXEC, |
f9652e10c allow build_open_... |
777 778 |
.intent = LOOKUP_OPEN, .lookup_flags = LOOKUP_FOLLOW, |
47c805dc2 switch do_filp_op... |
779 |
}; |
1da177e4c Linux-2.6.12-rc2 |
780 |
|
51f39a1f0 syscalls: impleme... |
781 782 783 784 785 786 787 788 |
if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH)) != 0) return ERR_PTR(-EINVAL); if (flags & AT_SYMLINK_NOFOLLOW) open_exec_flags.lookup_flags &= ~LOOKUP_FOLLOW; if (flags & AT_EMPTY_PATH) open_exec_flags.lookup_flags |= LOOKUP_EMPTY; file = do_filp_open(fd, name, &open_exec_flags); |
6e8341a11 Switch open_exec(... |
789 |
if (IS_ERR(file)) |
e56b6a5dd Re: [PATCH 3/6] v... |
790 791 792 |
goto out; err = -EACCES; |
496ad9aa8 new helper: file_... |
793 |
if (!S_ISREG(file_inode(file)->i_mode)) |
6e8341a11 Switch open_exec(... |
794 |
goto exit; |
e56b6a5dd Re: [PATCH 3/6] v... |
795 |
|
90f8572b0 vfs: Commit to ne... |
796 |
if (path_noexec(&file->f_path)) |
6e8341a11 Switch open_exec(... |
797 |
goto exit; |
e56b6a5dd Re: [PATCH 3/6] v... |
798 799 |
err = deny_write_access(file); |
6e8341a11 Switch open_exec(... |
800 801 |
if (err) goto exit; |
1da177e4c Linux-2.6.12-rc2 |
802 |
|
51f39a1f0 syscalls: impleme... |
803 804 |
if (name->name[0] != '\0') fsnotify_open(file); |
6e8341a11 Switch open_exec(... |
805 |
out: |
e56b6a5dd Re: [PATCH 3/6] v... |
806 |
return file; |
6e8341a11 Switch open_exec(... |
807 808 |
exit: fput(file); |
e56b6a5dd Re: [PATCH 3/6] v... |
809 810 |
return ERR_PTR(err); } |
c4ad8f98b execve: use 'stru... |
811 812 813 |
struct file *open_exec(const char *name) { |
516891041 fs: create proper... |
814 815 816 817 818 819 820 821 |
struct filename *filename = getname_kernel(name); struct file *f = ERR_CAST(filename); if (!IS_ERR(filename)) { f = do_open_execat(AT_FDCWD, filename, 0); putname(filename); } return f; |
c4ad8f98b execve: use 'stru... |
822 |
} |
1da177e4c Linux-2.6.12-rc2 |
823 |
EXPORT_SYMBOL(open_exec); |
6777d773a kernel_read: rede... |
824 825 |
int kernel_read(struct file *file, loff_t offset, char *addr, unsigned long count) |
1da177e4c Linux-2.6.12-rc2 |
826 827 828 829 830 831 832 833 834 835 836 837 838 839 |
{ mm_segment_t old_fs; loff_t pos = offset; int result; old_fs = get_fs(); set_fs(get_ds()); /* The cast to a user pointer is valid due to the set_fs() */ result = vfs_read(file, (void __user *)addr, count, &pos); set_fs(old_fs); return result; } EXPORT_SYMBOL(kernel_read); |
b44a7dfc6 vfs: define a gen... |
840 |
int kernel_read_file(struct file *file, void **buf, loff_t *size, |
bc8ca5b92 vfs: define kerne... |
841 |
loff_t max_size, enum kernel_read_file_id id) |
b44a7dfc6 vfs: define a gen... |
842 843 844 845 846 847 848 |
{ loff_t i_size, pos; ssize_t bytes = 0; int ret; if (!S_ISREG(file_inode(file)->i_mode) || max_size < 0) return -EINVAL; |
39eeb4fb9 security: define ... |
849 850 851 |
ret = security_kernel_read_file(file, id); if (ret) return ret; |
39d637af5 vfs: forbid write... |
852 853 854 |
ret = deny_write_access(file); if (ret) return ret; |
b44a7dfc6 vfs: define a gen... |
855 |
i_size = i_size_read(file_inode(file)); |
39d637af5 vfs: forbid write... |
856 857 858 859 860 861 862 863 |
if (max_size > 0 && i_size > max_size) { ret = -EFBIG; goto out; } if (i_size <= 0) { ret = -EINVAL; goto out; } |
b44a7dfc6 vfs: define a gen... |
864 |
|
a098ecd2f firmware: support... |
865 866 |
if (id != READING_FIRMWARE_PREALLOC_BUFFER) *buf = vmalloc(i_size); |
39d637af5 vfs: forbid write... |
867 868 869 870 |
if (!*buf) { ret = -ENOMEM; goto out; } |
b44a7dfc6 vfs: define a gen... |
871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 |
pos = 0; while (pos < i_size) { bytes = kernel_read(file, pos, (char *)(*buf) + pos, i_size - pos); if (bytes < 0) { ret = bytes; goto out; } if (bytes == 0) break; pos += bytes; } if (pos != i_size) { ret = -EIO; |
39d637af5 vfs: forbid write... |
888 |
goto out_free; |
b44a7dfc6 vfs: define a gen... |
889 |
} |
bc8ca5b92 vfs: define kerne... |
890 |
ret = security_kernel_post_read_file(file, *buf, i_size, id); |
b44a7dfc6 vfs: define a gen... |
891 892 |
if (!ret) *size = pos; |
39d637af5 vfs: forbid write... |
893 |
out_free: |
b44a7dfc6 vfs: define a gen... |
894 |
if (ret < 0) { |
a098ecd2f firmware: support... |
895 896 897 898 |
if (id != READING_FIRMWARE_PREALLOC_BUFFER) { vfree(*buf); *buf = NULL; } |
b44a7dfc6 vfs: define a gen... |
899 |
} |
39d637af5 vfs: forbid write... |
900 901 902 |
out: allow_write_access(file); |
b44a7dfc6 vfs: define a gen... |
903 904 905 |
return ret; } EXPORT_SYMBOL_GPL(kernel_read_file); |
09596b94f vfs: define kerne... |
906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 |
int kernel_read_file_from_path(char *path, void **buf, loff_t *size, loff_t max_size, enum kernel_read_file_id id) { struct file *file; int ret; if (!path || !*path) return -EINVAL; file = filp_open(path, O_RDONLY, 0); if (IS_ERR(file)) return PTR_ERR(file); ret = kernel_read_file(file, buf, size, max_size, id); fput(file); return ret; } EXPORT_SYMBOL_GPL(kernel_read_file_from_path); |
b844f0ecb vfs: define kerne... |
924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 |
int kernel_read_file_from_fd(int fd, void **buf, loff_t *size, loff_t max_size, enum kernel_read_file_id id) { struct fd f = fdget(fd); int ret = -EBADF; if (!f.file) goto out; ret = kernel_read_file(f.file, buf, size, max_size, id); out: fdput(f); return ret; } EXPORT_SYMBOL_GPL(kernel_read_file_from_fd); |
3dc20cb28 new helper: read_... |
939 940 |
ssize_t read_code(struct file *file, unsigned long addr, loff_t pos, size_t len) { |
ec6955798 read_code(): go t... |
941 |
ssize_t res = vfs_read(file, (void __user *)addr, len, &pos); |
3dc20cb28 new helper: read_... |
942 943 944 945 946 |
if (res > 0) flush_icache_range(addr, addr + len); return res; } EXPORT_SYMBOL(read_code); |
1da177e4c Linux-2.6.12-rc2 |
947 948 949 |
static int exec_mmap(struct mm_struct *mm) { struct task_struct *tsk; |
615d6e875 mm: per-thread vm... |
950 |
struct mm_struct *old_mm, *active_mm; |
1da177e4c Linux-2.6.12-rc2 |
951 952 953 954 955 956 957 |
/* Notify parent that we're no longer interested in the old VM */ tsk = current; old_mm = current->mm; mm_release(tsk, old_mm); if (old_mm) { |
4fe7efdbd mm: correctly syn... |
958 |
sync_mm_rss(old_mm); |
1da177e4c Linux-2.6.12-rc2 |
959 960 961 962 |
/* * Make sure that if there is a core dump in progress * for the old mm, we get out and die instead of going * through with the exec. We must hold mmap_sem around |
999d9fc16 coredump: move mm... |
963 |
* checking core_state and changing tsk->mm. |
1da177e4c Linux-2.6.12-rc2 |
964 965 |
*/ down_read(&old_mm->mmap_sem); |
999d9fc16 coredump: move mm... |
966 |
if (unlikely(old_mm->core_state)) { |
1da177e4c Linux-2.6.12-rc2 |
967 968 969 970 971 972 973 974 975 |
up_read(&old_mm->mmap_sem); return -EINTR; } } task_lock(tsk); active_mm = tsk->active_mm; tsk->mm = mm; tsk->active_mm = mm; activate_mm(active_mm, mm); |
615d6e875 mm: per-thread vm... |
976 977 |
tsk->mm->vmacache_seqnum = 0; vmacache_flush(tsk); |
1da177e4c Linux-2.6.12-rc2 |
978 |
task_unlock(tsk); |
1da177e4c Linux-2.6.12-rc2 |
979 980 |
if (old_mm) { up_read(&old_mm->mmap_sem); |
7dddb12c6 BUG_ON() Conversi... |
981 |
BUG_ON(active_mm != old_mm); |
701085b21 exec: move de_thr... |
982 |
setmax_mm_hiwater_rss(&tsk->signal->maxrss, old_mm); |
31a78f23b mm owner: fix rac... |
983 |
mm_update_next_owner(old_mm); |
1da177e4c Linux-2.6.12-rc2 |
984 985 986 987 988 989 990 991 992 993 994 995 996 |
mmput(old_mm); return 0; } mmdrop(active_mm); return 0; } /* * This function makes sure the current process has its own signal table, * so that flush_signal_handlers can later reset the handlers without * disturbing other processes. (Other processes might share the signal * table via the CLONE_SIGHAND option to clone().) */ |
858119e15 [PATCH] Unlinline... |
997 |
static int de_thread(struct task_struct *tsk) |
1da177e4c Linux-2.6.12-rc2 |
998 999 |
{ struct signal_struct *sig = tsk->signal; |
b2c903b87 exec: simplify th... |
1000 |
struct sighand_struct *oldsighand = tsk->sighand; |
1da177e4c Linux-2.6.12-rc2 |
1001 |
spinlock_t *lock = &oldsighand->siglock; |
1da177e4c Linux-2.6.12-rc2 |
1002 |
|
aafe6c2a2 [PATCH] de_thread... |
1003 |
if (thread_group_empty(tsk)) |
1da177e4c Linux-2.6.12-rc2 |
1004 1005 1006 1007 |
goto no_thread_group; /* * Kill all other threads in the thread group. |
1da177e4c Linux-2.6.12-rc2 |
1008 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1009 |
spin_lock_irq(lock); |
ed5d2cac1 exec: rework the ... |
1010 |
if (signal_group_exit(sig)) { |
1da177e4c Linux-2.6.12-rc2 |
1011 1012 1013 1014 1015 |
/* * Another group action in progress, just * return so that the signal is processed. */ spin_unlock_irq(lock); |
1da177e4c Linux-2.6.12-rc2 |
1016 1017 |
return -EAGAIN; } |
d344193a0 exit: avoid sig->... |
1018 |
|
ed5d2cac1 exec: rework the ... |
1019 |
sig->group_exit_task = tsk; |
d344193a0 exit: avoid sig->... |
1020 1021 1022 |
sig->notify_count = zap_other_threads(tsk); if (!thread_group_leader(tsk)) sig->notify_count--; |
1da177e4c Linux-2.6.12-rc2 |
1023 |
|
d344193a0 exit: avoid sig->... |
1024 |
while (sig->notify_count) { |
d5bbd43d5 exec: make de_thr... |
1025 |
__set_current_state(TASK_KILLABLE); |
1da177e4c Linux-2.6.12-rc2 |
1026 1027 |
spin_unlock_irq(lock); schedule(); |
d5bbd43d5 exec: make de_thr... |
1028 1029 |
if (unlikely(__fatal_signal_pending(tsk))) goto killed; |
1da177e4c Linux-2.6.12-rc2 |
1030 1031 |
spin_lock_irq(lock); } |
1da177e4c Linux-2.6.12-rc2 |
1032 1033 1034 1035 1036 1037 1038 |
spin_unlock_irq(lock); /* * At this point all other threads have exited, all we have to * do is to wait for the thread group leader to become inactive, * and to assume its PID: */ |
aafe6c2a2 [PATCH] de_thread... |
1039 |
if (!thread_group_leader(tsk)) { |
8187926bd posix-timers: sim... |
1040 |
struct task_struct *leader = tsk->group_leader; |
6db840fa7 exec: RT sub-thre... |
1041 |
|
6db840fa7 exec: RT sub-thre... |
1042 |
for (;;) { |
e56fb2874 exec: do not abus... |
1043 |
threadgroup_change_begin(tsk); |
6db840fa7 exec: RT sub-thre... |
1044 |
write_lock_irq(&tasklist_lock); |
dfcce791f fs/exec.c:de_thre... |
1045 1046 1047 1048 1049 |
/* * Do this under tasklist_lock to ensure that * exit_notify() can't miss ->group_exit_task */ sig->notify_count = -1; |
6db840fa7 exec: RT sub-thre... |
1050 1051 |
if (likely(leader->exit_state)) break; |
d5bbd43d5 exec: make de_thr... |
1052 |
__set_current_state(TASK_KILLABLE); |
6db840fa7 exec: RT sub-thre... |
1053 |
write_unlock_irq(&tasklist_lock); |
e56fb2874 exec: do not abus... |
1054 |
threadgroup_change_end(tsk); |
6db840fa7 exec: RT sub-thre... |
1055 |
schedule(); |
d5bbd43d5 exec: make de_thr... |
1056 1057 |
if (unlikely(__fatal_signal_pending(tsk))) goto killed; |
6db840fa7 exec: RT sub-thre... |
1058 |
} |
1da177e4c Linux-2.6.12-rc2 |
1059 |
|
f5e902817 [PATCH] process a... |
1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 |
/* * The only record we have of the real-time age of a * process, regardless of execs it's done, is start_time. * All the past CPU time is accumulated in signal_struct * from sister threads now dead. But in this non-leader * exec, nothing survives from the original leader thread, * whose birth marks the true age of this process now. * When we take on its identity by switching to its PID, we * also take its birthdate (always earlier than our own). */ |
aafe6c2a2 [PATCH] de_thread... |
1070 |
tsk->start_time = leader->start_time; |
266b7a021 fs/exec.c:de_thre... |
1071 |
tsk->real_start_time = leader->real_start_time; |
f5e902817 [PATCH] process a... |
1072 |
|
bac0abd61 Isolate some expl... |
1073 1074 |
BUG_ON(!same_thread_group(leader, tsk)); BUG_ON(has_group_leader_pid(tsk)); |
1da177e4c Linux-2.6.12-rc2 |
1075 1076 1077 1078 1079 1080 |
/* * An exec() starts a new thread group with the * TGID of the previous thread group. Rehash the * two threads with a switched PID, and release * the former thread group leader: */ |
d73d65293 [PATCH] pidhash: ... |
1081 1082 |
/* Become a process group leader with the old leader's pid. |
c18258c6f [PATCH] pid: Impl... |
1083 1084 |
* The old leader becomes a thread of the this thread group. * Note: The old leader also uses this pid until release_task |
d73d65293 [PATCH] pidhash: ... |
1085 1086 |
* is called. Odd but simple and correct. */ |
aafe6c2a2 [PATCH] de_thread... |
1087 |
tsk->pid = leader->pid; |
3f4185483 fs/exec.c:de_thre... |
1088 |
change_pid(tsk, PIDTYPE_PID, task_pid(leader)); |
aafe6c2a2 [PATCH] de_thread... |
1089 1090 |
transfer_pid(leader, tsk, PIDTYPE_PGID); transfer_pid(leader, tsk, PIDTYPE_SID); |
9cd80bbb0 do_wait() optimiz... |
1091 |
|
aafe6c2a2 [PATCH] de_thread... |
1092 |
list_replace_rcu(&leader->tasks, &tsk->tasks); |
9cd80bbb0 do_wait() optimiz... |
1093 |
list_replace_init(&leader->sibling, &tsk->sibling); |
1da177e4c Linux-2.6.12-rc2 |
1094 |
|
aafe6c2a2 [PATCH] de_thread... |
1095 1096 |
tsk->group_leader = tsk; leader->group_leader = tsk; |
de12a7878 [PATCH] de_thread... |
1097 |
|
aafe6c2a2 [PATCH] de_thread... |
1098 |
tsk->exit_signal = SIGCHLD; |
087806b12 redefine thread_g... |
1099 |
leader->exit_signal = -1; |
962b564cf [PATCH] fix do_wa... |
1100 1101 1102 |
BUG_ON(leader->exit_state != EXIT_ZOMBIE); leader->exit_state = EXIT_DEAD; |
eac1b5e57 ptrace: do_wait(t... |
1103 1104 1105 1106 1107 1108 1109 1110 |
/* * We are going to release_task()->ptrace_unlink() silently, * the tracer can sleep in do_wait(). EXIT_DEAD guarantees * the tracer wont't block again waiting for this thread. */ if (unlikely(leader->ptrace)) __wake_up_parent(leader, leader->parent); |
1da177e4c Linux-2.6.12-rc2 |
1111 |
write_unlock_irq(&tasklist_lock); |
e56fb2874 exec: do not abus... |
1112 |
threadgroup_change_end(tsk); |
8187926bd posix-timers: sim... |
1113 1114 |
release_task(leader); |
ed5d2cac1 exec: rework the ... |
1115 |
} |
1da177e4c Linux-2.6.12-rc2 |
1116 |
|
6db840fa7 exec: RT sub-thre... |
1117 1118 |
sig->group_exit_task = NULL; sig->notify_count = 0; |
1da177e4c Linux-2.6.12-rc2 |
1119 1120 |
no_thread_group: |
e63682534 exit_signal: simp... |
1121 1122 |
/* we have changed execution domain */ tsk->exit_signal = SIGCHLD; |
1da177e4c Linux-2.6.12-rc2 |
1123 |
exit_itimers(sig); |
cbaffba12 posix timers: dis... |
1124 |
flush_itimer_signals(); |
329f7dba5 [PATCH] fix de_th... |
1125 |
|
b2c903b87 exec: simplify th... |
1126 1127 |
if (atomic_read(&oldsighand->count) != 1) { struct sighand_struct *newsighand; |
1da177e4c Linux-2.6.12-rc2 |
1128 |
/* |
b2c903b87 exec: simplify th... |
1129 1130 |
* This ->sighand is shared with the CLONE_SIGHAND * but not CLONE_THREAD task, switch to the new one. |
1da177e4c Linux-2.6.12-rc2 |
1131 |
*/ |
b2c903b87 exec: simplify th... |
1132 1133 1134 |
newsighand = kmem_cache_alloc(sighand_cachep, GFP_KERNEL); if (!newsighand) return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
1135 1136 1137 1138 1139 1140 |
atomic_set(&newsighand->count, 1); memcpy(newsighand->action, oldsighand->action, sizeof(newsighand->action)); write_lock_irq(&tasklist_lock); spin_lock(&oldsighand->siglock); |
aafe6c2a2 [PATCH] de_thread... |
1141 |
rcu_assign_pointer(tsk->sighand, newsighand); |
1da177e4c Linux-2.6.12-rc2 |
1142 1143 |
spin_unlock(&oldsighand->siglock); write_unlock_irq(&tasklist_lock); |
fba2afaae signal/timer/even... |
1144 |
__cleanup_sighand(oldsighand); |
1da177e4c Linux-2.6.12-rc2 |
1145 |
} |
aafe6c2a2 [PATCH] de_thread... |
1146 |
BUG_ON(!thread_group_leader(tsk)); |
1da177e4c Linux-2.6.12-rc2 |
1147 |
return 0; |
d5bbd43d5 exec: make de_thr... |
1148 1149 1150 1151 1152 1153 1154 1155 |
killed: /* protects against exit_notify() and __exit_signal() */ read_lock(&tasklist_lock); sig->group_exit_task = NULL; sig->notify_count = 0; read_unlock(&tasklist_lock); return -EAGAIN; |
1da177e4c Linux-2.6.12-rc2 |
1156 |
} |
0840a90d9 exec: simplify ->... |
1157 |
|
59714d65d get_task_comm(): ... |
1158 |
char *get_task_comm(char *buf, struct task_struct *tsk) |
1da177e4c Linux-2.6.12-rc2 |
1159 1160 1161 1162 1163 |
{ /* buf must be at least sizeof(tsk->comm) in size */ task_lock(tsk); strncpy(buf, tsk->comm, sizeof(tsk->comm)); task_unlock(tsk); |
59714d65d get_task_comm(): ... |
1164 |
return buf; |
1da177e4c Linux-2.6.12-rc2 |
1165 |
} |
7d74f492e export kernel cal... |
1166 |
EXPORT_SYMBOL_GPL(get_task_comm); |
1da177e4c Linux-2.6.12-rc2 |
1167 |
|
6a6d27de3 take close-on-exe... |
1168 1169 1170 1171 |
/* * These functions flushes out all traces of the currently running executable * so that a new one can be started */ |
82b897782 perf: Differentia... |
1172 |
void __set_task_comm(struct task_struct *tsk, const char *buf, bool exec) |
1da177e4c Linux-2.6.12-rc2 |
1173 1174 |
{ task_lock(tsk); |
43d2b1132 tracepoint: add t... |
1175 |
trace_task_rename(tsk, buf); |
1da177e4c Linux-2.6.12-rc2 |
1176 1177 |
strlcpy(tsk->comm, buf, sizeof(tsk->comm)); task_unlock(tsk); |
82b897782 perf: Differentia... |
1178 |
perf_event_comm(tsk, exec); |
1da177e4c Linux-2.6.12-rc2 |
1179 1180 1181 1182 |
} int flush_old_exec(struct linux_binprm * bprm) { |
221af7f87 Split 'flush_old_... |
1183 |
int retval; |
1da177e4c Linux-2.6.12-rc2 |
1184 1185 1186 1187 1188 1189 1190 1191 |
/* * Make sure we have a private signal table and that * we are unassociated from the previous thread group. */ retval = de_thread(current); if (retval) goto out; |
6e399cd14 prctl: avoid usin... |
1192 1193 1194 1195 1196 |
/* * Must be called _before_ exec_mmap() as bprm->mm is * not visibile until then. This also enables the update * to be lockless. */ |
925d1c401 procfs task exe s... |
1197 |
set_mm_exe_file(bprm->mm, bprm->file); |
6e399cd14 prctl: avoid usin... |
1198 |
|
1da177e4c Linux-2.6.12-rc2 |
1199 |
/* |
1da177e4c Linux-2.6.12-rc2 |
1200 1201 |
* Release all of the old mmap stuff */ |
3c77f8457 exec: make argv/e... |
1202 |
acct_arg_size(bprm, 0); |
1da177e4c Linux-2.6.12-rc2 |
1203 1204 |
retval = exec_mmap(bprm->mm); if (retval) |
fd8328be8 [PATCH] sanitize ... |
1205 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
1206 1207 |
bprm->mm = NULL; /* We're using it now */ |
7ab02af42 Fix 'flush_old_ex... |
1208 |
|
dac853ae8 exec: delay addre... |
1209 |
set_fs(USER_DS); |
b88fae644 exec: avoid propa... |
1210 1211 |
current->flags &= ~(PF_RANDOMIZE | PF_FORKNOEXEC | PF_KTHREAD | PF_NOFREEZE | PF_NO_SETAFFINITY); |
7ab02af42 Fix 'flush_old_ex... |
1212 1213 |
flush_thread(); current->personality &= ~bprm->per_clear; |
c1df5a637 fs: exec: apply C... |
1214 1215 1216 1217 1218 1219 1220 |
/* * We have to apply CLOEXEC before we change whether the process is * dumpable (in setup_new_exec) to avoid a race with a process in userspace * trying to access the should-be-closed file descriptors of a process * undergoing exec(2). */ do_close_on_exec(current->files); |
221af7f87 Split 'flush_old_... |
1221 1222 1223 1224 1225 1226 |
return 0; out: return retval; } EXPORT_SYMBOL(flush_old_exec); |
1b5d783c9 consolidate BINPR... |
1227 1228 |
void would_dump(struct linux_binprm *bprm, struct file *file) { |
21245b863 exec: Ensure mm->... |
1229 1230 1231 |
struct inode *inode = file_inode(file); if (inode_permission(inode, MAY_READ) < 0) { struct user_namespace *old, *user_ns; |
1b5d783c9 consolidate BINPR... |
1232 |
bprm->interp_flags |= BINPRM_FLAGS_ENFORCE_NONDUMP; |
21245b863 exec: Ensure mm->... |
1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 |
/* Ensure mm->user_ns contains the executable */ user_ns = old = bprm->mm->user_ns; while ((user_ns != &init_user_ns) && !privileged_wrt_inode_uidgid(user_ns, inode)) user_ns = user_ns->parent; if (old != user_ns) { bprm->mm->user_ns = get_user_ns(user_ns); put_user_ns(old); } } |
1b5d783c9 consolidate BINPR... |
1245 1246 |
} EXPORT_SYMBOL(would_dump); |
221af7f87 Split 'flush_old_... |
1247 1248 |
void setup_new_exec(struct linux_binprm * bprm) { |
221af7f87 Split 'flush_old_... |
1249 |
arch_pick_mmap_layout(current->mm); |
1da177e4c Linux-2.6.12-rc2 |
1250 1251 |
/* This is the point of no return */ |
1da177e4c Linux-2.6.12-rc2 |
1252 |
current->sas_ss_sp = current->sas_ss_size = 0; |
8e96e3b7b userns: Use uid_e... |
1253 |
if (uid_eq(current_euid(), current_uid()) && gid_eq(current_egid(), current_gid())) |
e579d2c25 coredump: remove ... |
1254 |
set_dumpable(current->mm, SUID_DUMP_USER); |
d6e711448 [PATCH] setuid co... |
1255 |
else |
6c5d52382 coredump masking:... |
1256 |
set_dumpable(current->mm, suid_dumpable); |
d6e711448 [PATCH] setuid co... |
1257 |
|
e041e328c perf: Fix perf_ev... |
1258 |
perf_event_exec(); |
82b897782 perf: Differentia... |
1259 |
__set_task_comm(current, kbasename(bprm->filename), true); |
1da177e4c Linux-2.6.12-rc2 |
1260 |
|
0551fbd29 [PATCH] Add mm->t... |
1261 1262 1263 1264 1265 |
/* Set the new mm task size. We have to do that late because it may * depend on TIF_32BIT which is only updated in flush_thread() on * some architectures like powerpc */ current->mm->task_size = TASK_SIZE; |
a6f76f23d CRED: Make execve... |
1266 |
/* install the new credentials */ |
8e96e3b7b userns: Use uid_e... |
1267 1268 |
if (!uid_eq(bprm->cred->uid, current_euid()) || !gid_eq(bprm->cred->gid, current_egid())) { |
d2d56c5f5 Reset current->pd... |
1269 |
current->pdeath_signal = 0; |
1b5d783c9 consolidate BINPR... |
1270 |
} else { |
1b5d783c9 consolidate BINPR... |
1271 1272 |
if (bprm->interp_flags & BINPRM_FLAGS_ENFORCE_NONDUMP) set_dumpable(current->mm, suid_dumpable); |
1da177e4c Linux-2.6.12-rc2 |
1273 1274 1275 1276 |
} /* An exec changes our domain. We are no longer part of the thread group */ |
1da177e4c Linux-2.6.12-rc2 |
1277 |
current->self_exec_id++; |
1da177e4c Linux-2.6.12-rc2 |
1278 |
flush_signal_handlers(current, 0); |
1da177e4c Linux-2.6.12-rc2 |
1279 |
} |
221af7f87 Split 'flush_old_... |
1280 |
EXPORT_SYMBOL(setup_new_exec); |
1da177e4c Linux-2.6.12-rc2 |
1281 |
|
a6f76f23d CRED: Make execve... |
1282 |
/* |
a2a8474c3 exec: do not slee... |
1283 1284 1285 1286 1287 1288 1289 |
* Prepare credentials and lock ->cred_guard_mutex. * install_exec_creds() commits the new creds and drops the lock. * Or, if exec fails before, free_bprm() should release ->cred and * and unlock. */ int prepare_bprm_creds(struct linux_binprm *bprm) { |
9b1bf12d5 signals: move cre... |
1290 |
if (mutex_lock_interruptible(¤t->signal->cred_guard_mutex)) |
a2a8474c3 exec: do not slee... |
1291 1292 1293 1294 1295 |
return -ERESTARTNOINTR; bprm->cred = prepare_exec_creds(); if (likely(bprm->cred)) return 0; |
9b1bf12d5 signals: move cre... |
1296 |
mutex_unlock(¤t->signal->cred_guard_mutex); |
a2a8474c3 exec: do not slee... |
1297 1298 |
return -ENOMEM; } |
c4ad8f98b execve: use 'stru... |
1299 |
static void free_bprm(struct linux_binprm *bprm) |
a2a8474c3 exec: do not slee... |
1300 1301 1302 |
{ free_arg_pages(bprm); if (bprm->cred) { |
9b1bf12d5 signals: move cre... |
1303 |
mutex_unlock(¤t->signal->cred_guard_mutex); |
a2a8474c3 exec: do not slee... |
1304 1305 |
abort_creds(bprm->cred); } |
63e46b95e exec: move the fi... |
1306 1307 1308 1309 |
if (bprm->file) { allow_write_access(bprm->file); fput(bprm->file); } |
b66c59840 exec: do not leav... |
1310 1311 1312 |
/* If a binfmt changed the interp, free it. */ if (bprm->interp != bprm->filename) kfree(bprm->interp); |
a2a8474c3 exec: do not slee... |
1313 1314 |
kfree(bprm); } |
b66c59840 exec: do not leav... |
1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 |
int bprm_change_interp(char *interp, struct linux_binprm *bprm) { /* If a binfmt changed the interp, free it first. */ if (bprm->interp != bprm->filename) kfree(bprm->interp); bprm->interp = kstrdup(interp, GFP_KERNEL); if (!bprm->interp) return -ENOMEM; return 0; } EXPORT_SYMBOL(bprm_change_interp); |
a2a8474c3 exec: do not slee... |
1326 |
/* |
a6f76f23d CRED: Make execve... |
1327 1328 1329 1330 1331 1332 1333 1334 |
* install the new credentials for this executable */ void install_exec_creds(struct linux_binprm *bprm) { security_bprm_committing_creds(bprm); commit_creds(bprm->cred); bprm->cred = NULL; |
2976b10f0 perf: Disable mon... |
1335 1336 1337 1338 1339 1340 1341 1342 1343 |
/* * Disable monitoring for regular users * when executing setuid binaries. Must * wait until new credentials are committed * by commit_creds() above */ if (get_dumpable(current->mm) != SUID_DUMP_USER) perf_event_exit_task(current); |
a2a8474c3 exec: do not slee... |
1344 1345 |
/* * cred_guard_mutex must be held at least to this point to prevent |
a6f76f23d CRED: Make execve... |
1346 |
* ptrace_attach() from altering our determination of the task's |
a2a8474c3 exec: do not slee... |
1347 1348 |
* credentials; any time after this it may be unlocked. */ |
a6f76f23d CRED: Make execve... |
1349 |
security_bprm_committed_creds(bprm); |
9b1bf12d5 signals: move cre... |
1350 |
mutex_unlock(¤t->signal->cred_guard_mutex); |
a6f76f23d CRED: Make execve... |
1351 1352 1353 1354 1355 |
} EXPORT_SYMBOL(install_exec_creds); /* * determine how safe it is to execute the proposed program |
9b1bf12d5 signals: move cre... |
1356 |
* - the caller must hold ->cred_guard_mutex to protect against |
c2e1f2e30 seccomp: implemen... |
1357 |
* PTRACE_ATTACH or seccomp thread-sync |
a6f76f23d CRED: Make execve... |
1358 |
*/ |
9e00cdb09 exec:check_unsafe... |
1359 |
static void check_unsafe_exec(struct linux_binprm *bprm) |
a6f76f23d CRED: Make execve... |
1360 |
{ |
0bf2f3aec CRED: Fix SUID ex... |
1361 |
struct task_struct *p = current, *t; |
f1191b50e check_unsafe_exec... |
1362 |
unsigned n_fs; |
a6f76f23d CRED: Make execve... |
1363 |
|
4b9d33e6d ptrace: kill clon... |
1364 |
if (p->ptrace) { |
e747b4ae3 ptrace: Capture t... |
1365 |
if (ptracer_capable(p, current_user_ns())) |
4b9d33e6d ptrace: kill clon... |
1366 1367 1368 1369 |
bprm->unsafe |= LSM_UNSAFE_PTRACE_CAP; else bprm->unsafe |= LSM_UNSAFE_PTRACE; } |
a6f76f23d CRED: Make execve... |
1370 |
|
259e5e6c7 Add PR_{GET,SET}_... |
1371 1372 1373 1374 |
/* * This isn't strictly necessary, but it makes it harder for LSMs to * mess up. */ |
1d4457f99 sched: move no_ne... |
1375 |
if (task_no_new_privs(current)) |
259e5e6c7 Add PR_{GET,SET}_... |
1376 |
bprm->unsafe |= LSM_UNSAFE_NO_NEW_PRIVS; |
83f62a2ea exec:check_unsafe... |
1377 |
t = p; |
0bf2f3aec CRED: Fix SUID ex... |
1378 |
n_fs = 1; |
2a4419b5b fs: fs_struct rwl... |
1379 |
spin_lock(&p->fs->lock); |
437f7fdb6 check_unsafe_exec... |
1380 |
rcu_read_lock(); |
83f62a2ea exec:check_unsafe... |
1381 |
while_each_thread(p, t) { |
0bf2f3aec CRED: Fix SUID ex... |
1382 1383 |
if (t->fs == p->fs) n_fs++; |
0bf2f3aec CRED: Fix SUID ex... |
1384 |
} |
437f7fdb6 check_unsafe_exec... |
1385 |
rcu_read_unlock(); |
0bf2f3aec CRED: Fix SUID ex... |
1386 |
|
9e00cdb09 exec:check_unsafe... |
1387 |
if (p->fs->users > n_fs) |
a6f76f23d CRED: Make execve... |
1388 |
bprm->unsafe |= LSM_UNSAFE_SHARE; |
9e00cdb09 exec:check_unsafe... |
1389 1390 |
else p->fs->in_exec = 1; |
2a4419b5b fs: fs_struct rwl... |
1391 |
spin_unlock(&p->fs->lock); |
a6f76f23d CRED: Make execve... |
1392 |
} |
8b01fc86b fs: take i_mutex ... |
1393 1394 1395 1396 1397 1398 |
static void bprm_fill_uid(struct linux_binprm *bprm) { struct inode *inode; unsigned int mode; kuid_t uid; kgid_t gid; |
cb6fd68fd exec: clarify rea... |
1399 1400 1401 1402 1403 1404 |
/* * Since this can be called multiple times (via prepare_binprm), * we must clear any previous work done when setting set[ug]id * bits from any earlier bprm->file uses (for example when run * first for a setuid script then again for its interpreter). */ |
8b01fc86b fs: take i_mutex ... |
1405 1406 |
bprm->cred->euid = current_euid(); bprm->cred->egid = current_egid(); |
380cf5ba6 fs: Treat foreign... |
1407 |
if (!mnt_may_suid(bprm->file->f_path.mnt)) |
8b01fc86b fs: take i_mutex ... |
1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 |
return; if (task_no_new_privs(current)) return; inode = file_inode(bprm->file); mode = READ_ONCE(inode->i_mode); if (!(mode & (S_ISUID|S_ISGID))) return; /* Be careful if suid/sgid is set */ |
5955102c9 wrappers for ->i_... |
1419 |
inode_lock(inode); |
8b01fc86b fs: take i_mutex ... |
1420 1421 1422 1423 1424 |
/* reload atomically mode/uid/gid now that lock held */ mode = inode->i_mode; uid = inode->i_uid; gid = inode->i_gid; |
5955102c9 wrappers for ->i_... |
1425 |
inode_unlock(inode); |
8b01fc86b fs: take i_mutex ... |
1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 |
/* We ignore suid/sgid if there are no mappings for them in the ns */ if (!kuid_has_mapping(bprm->cred->user_ns, uid) || !kgid_has_mapping(bprm->cred->user_ns, gid)) return; if (mode & S_ISUID) { bprm->per_clear |= PER_CLEAR_ON_SETID; bprm->cred->euid = uid; } if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) { bprm->per_clear |= PER_CLEAR_ON_SETID; bprm->cred->egid = gid; } } |
9e00cdb09 exec:check_unsafe... |
1442 1443 |
/* * Fill the binprm structure from the inode. |
1da177e4c Linux-2.6.12-rc2 |
1444 |
* Check permissions, then read the first 128 (BINPRM_BUF_SIZE) bytes |
a6f76f23d CRED: Make execve... |
1445 1446 |
* * This may be called multiple times for binary chains (scripts for example). |
1da177e4c Linux-2.6.12-rc2 |
1447 1448 1449 |
*/ int prepare_binprm(struct linux_binprm *bprm) { |
1da177e4c Linux-2.6.12-rc2 |
1450 |
int retval; |
8b01fc86b fs: take i_mutex ... |
1451 |
bprm_fill_uid(bprm); |
1da177e4c Linux-2.6.12-rc2 |
1452 1453 |
/* fill in binprm security blob */ |
a6f76f23d CRED: Make execve... |
1454 |
retval = security_bprm_set_creds(bprm); |
1da177e4c Linux-2.6.12-rc2 |
1455 1456 |
if (retval) return retval; |
a6f76f23d CRED: Make execve... |
1457 |
bprm->cred_prepared = 1; |
1da177e4c Linux-2.6.12-rc2 |
1458 |
|
a6f76f23d CRED: Make execve... |
1459 1460 |
memset(bprm->buf, 0, BINPRM_BUF_SIZE); return kernel_read(bprm->file, 0, bprm->buf, BINPRM_BUF_SIZE); |
1da177e4c Linux-2.6.12-rc2 |
1461 1462 1463 |
} EXPORT_SYMBOL(prepare_binprm); |
4fc75ff48 exec: fix remove_... |
1464 1465 1466 1467 1468 |
/* * Arguments are '\0' separated strings found at the location bprm->p * points to; chop off the first by relocating brpm->p to right after * the first '\0' encountered. */ |
b6a2fea39 mm: variable leng... |
1469 |
int remove_arg_zero(struct linux_binprm *bprm) |
1da177e4c Linux-2.6.12-rc2 |
1470 |
{ |
b6a2fea39 mm: variable leng... |
1471 1472 1473 1474 |
int ret = 0; unsigned long offset; char *kaddr; struct page *page; |
4fc75ff48 exec: fix remove_... |
1475 |
|
b6a2fea39 mm: variable leng... |
1476 1477 |
if (!bprm->argc) return 0; |
1da177e4c Linux-2.6.12-rc2 |
1478 |
|
b6a2fea39 mm: variable leng... |
1479 1480 1481 1482 1483 1484 1485 |
do { offset = bprm->p & ~PAGE_MASK; page = get_arg_page(bprm, bprm->p, 0); if (!page) { ret = -EFAULT; goto out; } |
e8e3c3d66 fs: remove the se... |
1486 |
kaddr = kmap_atomic(page); |
4fc75ff48 exec: fix remove_... |
1487 |
|
b6a2fea39 mm: variable leng... |
1488 1489 1490 |
for (; offset < PAGE_SIZE && kaddr[offset]; offset++, bprm->p++) ; |
4fc75ff48 exec: fix remove_... |
1491 |
|
e8e3c3d66 fs: remove the se... |
1492 |
kunmap_atomic(kaddr); |
b6a2fea39 mm: variable leng... |
1493 |
put_arg_page(page); |
b6a2fea39 mm: variable leng... |
1494 |
} while (offset == PAGE_SIZE); |
4fc75ff48 exec: fix remove_... |
1495 |
|
b6a2fea39 mm: variable leng... |
1496 1497 1498 |
bprm->p++; bprm->argc--; ret = 0; |
4fc75ff48 exec: fix remove_... |
1499 |
|
b6a2fea39 mm: variable leng... |
1500 1501 |
out: return ret; |
1da177e4c Linux-2.6.12-rc2 |
1502 |
} |
1da177e4c Linux-2.6.12-rc2 |
1503 |
EXPORT_SYMBOL(remove_arg_zero); |
cb7b6b1cb exec: cleanup the... |
1504 1505 |
#define printable(c) (((c)=='\t') || ((c)==' ') || (0x20<=(c) && (c)<=0x7e)) |
1da177e4c Linux-2.6.12-rc2 |
1506 1507 1508 |
/* * cycle the list of binary formats handler, until one recognizes the image */ |
3c456bfc4 get rid of pt_reg... |
1509 |
int search_binary_handler(struct linux_binprm *bprm) |
1da177e4c Linux-2.6.12-rc2 |
1510 |
{ |
cb7b6b1cb exec: cleanup the... |
1511 |
bool need_retry = IS_ENABLED(CONFIG_MODULES); |
1da177e4c Linux-2.6.12-rc2 |
1512 |
struct linux_binfmt *fmt; |
cb7b6b1cb exec: cleanup the... |
1513 |
int retval; |
1da177e4c Linux-2.6.12-rc2 |
1514 |
|
d74026986 exec: use -ELOOP ... |
1515 |
/* This allows 4 levels of binfmt rewrites before failing hard. */ |
131b2f9f1 exec: kill "int d... |
1516 |
if (bprm->recursion_depth > 5) |
d74026986 exec: use -ELOOP ... |
1517 |
return -ELOOP; |
1da177e4c Linux-2.6.12-rc2 |
1518 1519 1520 |
retval = security_bprm_check(bprm); if (retval) return retval; |
1da177e4c Linux-2.6.12-rc2 |
1521 |
retval = -ENOENT; |
cb7b6b1cb exec: cleanup the... |
1522 1523 1524 1525 1526 1527 1528 1529 |
retry: read_lock(&binfmt_lock); list_for_each_entry(fmt, &formats, lh) { if (!try_module_get(fmt->module)) continue; read_unlock(&binfmt_lock); bprm->recursion_depth++; retval = fmt->load_binary(bprm); |
19d860a14 handle suicide on... |
1530 1531 |
read_lock(&binfmt_lock); put_binfmt(fmt); |
cb7b6b1cb exec: cleanup the... |
1532 |
bprm->recursion_depth--; |
19d860a14 handle suicide on... |
1533 1534 1535 1536 1537 1538 1539 1540 |
if (retval < 0 && !bprm->mm) { /* we got to flush_old_exec() and failed after it */ read_unlock(&binfmt_lock); force_sigsegv(SIGSEGV, current); return retval; } if (retval != -ENOEXEC || !bprm->file) { read_unlock(&binfmt_lock); |
cb7b6b1cb exec: cleanup the... |
1541 |
return retval; |
1da177e4c Linux-2.6.12-rc2 |
1542 |
} |
1da177e4c Linux-2.6.12-rc2 |
1543 |
} |
cb7b6b1cb exec: cleanup the... |
1544 |
read_unlock(&binfmt_lock); |
19d860a14 handle suicide on... |
1545 |
if (need_retry) { |
cb7b6b1cb exec: cleanup the... |
1546 1547 1548 |
if (printable(bprm->buf[0]) && printable(bprm->buf[1]) && printable(bprm->buf[2]) && printable(bprm->buf[3])) return retval; |
4e0621a07 exec: don't retry... |
1549 1550 |
if (request_module("binfmt-%04x", *(ushort *)(bprm->buf + 2)) < 0) return retval; |
cb7b6b1cb exec: cleanup the... |
1551 1552 1553 |
need_retry = false; goto retry; } |
1da177e4c Linux-2.6.12-rc2 |
1554 1555 |
return retval; } |
1da177e4c Linux-2.6.12-rc2 |
1556 |
EXPORT_SYMBOL(search_binary_handler); |
5d1baf3b6 exec: introduce e... |
1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 |
static int exec_binprm(struct linux_binprm *bprm) { pid_t old_pid, old_vpid; int ret; /* Need to fetch pid before load_binary changes it */ old_pid = current->pid; rcu_read_lock(); old_vpid = task_pid_nr_ns(current, task_active_pid_ns(current->parent)); rcu_read_unlock(); ret = search_binary_handler(bprm); if (ret >= 0) { |
3eaded86a Merge git://git.i... |
1570 |
audit_bprm(bprm); |
5d1baf3b6 exec: introduce e... |
1571 1572 |
trace_sched_process_exec(current, old_pid, bprm); ptrace_event(PTRACE_EVENT_EXEC, old_vpid); |
9beb266f2 exec: proc_exec_c... |
1573 |
proc_exec_connector(current); |
5d1baf3b6 exec: introduce e... |
1574 1575 1576 1577 |
} return ret; } |
1da177e4c Linux-2.6.12-rc2 |
1578 1579 1580 |
/* * sys_execve() executes a new program. */ |
51f39a1f0 syscalls: impleme... |
1581 1582 1583 1584 |
static int do_execveat_common(int fd, struct filename *filename, struct user_arg_ptr argv, struct user_arg_ptr envp, int flags) |
1da177e4c Linux-2.6.12-rc2 |
1585 |
{ |
51f39a1f0 syscalls: impleme... |
1586 |
char *pathbuf = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1587 1588 |
struct linux_binprm *bprm; struct file *file; |
3b1253880 [PATCH] sanitize ... |
1589 |
struct files_struct *displaced; |
1da177e4c Linux-2.6.12-rc2 |
1590 |
int retval; |
72fa59970 move RLIMIT_NPROC... |
1591 |
|
c4ad8f98b execve: use 'stru... |
1592 1593 |
if (IS_ERR(filename)) return PTR_ERR(filename); |
72fa59970 move RLIMIT_NPROC... |
1594 1595 1596 1597 1598 1599 1600 |
/* * We move the actual failure in case of RLIMIT_NPROC excess from * set*uid() to execve() because too many poorly written programs * don't check setuid() return code. Here we additionally recheck * whether NPROC limit is still exceeded. */ if ((current->flags & PF_NPROC_EXCEEDED) && |
bd9d43f47 fs/exec.c: do_exe... |
1601 |
atomic_read(¤t_user()->processes) > rlimit(RLIMIT_NPROC)) { |
72fa59970 move RLIMIT_NPROC... |
1602 1603 1604 1605 1606 1607 1608 |
retval = -EAGAIN; goto out_ret; } /* We're below the limit (still or again), so we don't want to make * further execve() calls fail. */ current->flags &= ~PF_NPROC_EXCEEDED; |
1da177e4c Linux-2.6.12-rc2 |
1609 |
|
3b1253880 [PATCH] sanitize ... |
1610 |
retval = unshare_files(&displaced); |
fd8328be8 [PATCH] sanitize ... |
1611 1612 |
if (retval) goto out_ret; |
1da177e4c Linux-2.6.12-rc2 |
1613 |
retval = -ENOMEM; |
11b0b5abb [PATCH] use kzall... |
1614 |
bprm = kzalloc(sizeof(*bprm), GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
1615 |
if (!bprm) |
fd8328be8 [PATCH] sanitize ... |
1616 |
goto out_files; |
1da177e4c Linux-2.6.12-rc2 |
1617 |
|
a2a8474c3 exec: do not slee... |
1618 1619 |
retval = prepare_bprm_creds(bprm); if (retval) |
a6f76f23d CRED: Make execve... |
1620 |
goto out_free; |
498052bba New locking/refco... |
1621 |
|
9e00cdb09 exec:check_unsafe... |
1622 |
check_unsafe_exec(bprm); |
a2a8474c3 exec: do not slee... |
1623 |
current->in_execve = 1; |
a6f76f23d CRED: Make execve... |
1624 |
|
51f39a1f0 syscalls: impleme... |
1625 |
file = do_open_execat(fd, filename, flags); |
1da177e4c Linux-2.6.12-rc2 |
1626 1627 |
retval = PTR_ERR(file); if (IS_ERR(file)) |
498052bba New locking/refco... |
1628 |
goto out_unmark; |
1da177e4c Linux-2.6.12-rc2 |
1629 1630 |
sched_exec(); |
1da177e4c Linux-2.6.12-rc2 |
1631 |
bprm->file = file; |
51f39a1f0 syscalls: impleme... |
1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 |
if (fd == AT_FDCWD || filename->name[0] == '/') { bprm->filename = filename->name; } else { if (filename->name[0] == '\0') pathbuf = kasprintf(GFP_TEMPORARY, "/dev/fd/%d", fd); else pathbuf = kasprintf(GFP_TEMPORARY, "/dev/fd/%d/%s", fd, filename->name); if (!pathbuf) { retval = -ENOMEM; goto out_unmark; } /* * Record that a name derived from an O_CLOEXEC fd will be * inaccessible after exec. Relies on having exclusive access to * current->files (due to unshare_files above). */ if (close_on_exec(fd, rcu_dereference_raw(current->files->fdt))) bprm->interp_flags |= BINPRM_FLAGS_PATH_INACCESSIBLE; bprm->filename = pathbuf; } bprm->interp = bprm->filename; |
1da177e4c Linux-2.6.12-rc2 |
1654 |
|
b6a2fea39 mm: variable leng... |
1655 1656 |
retval = bprm_mm_init(bprm); if (retval) |
63e46b95e exec: move the fi... |
1657 |
goto out_unmark; |
1da177e4c Linux-2.6.12-rc2 |
1658 |
|
b6a2fea39 mm: variable leng... |
1659 |
bprm->argc = count(argv, MAX_ARG_STRINGS); |
1da177e4c Linux-2.6.12-rc2 |
1660 |
if ((retval = bprm->argc) < 0) |
a6f76f23d CRED: Make execve... |
1661 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
1662 |
|
b6a2fea39 mm: variable leng... |
1663 |
bprm->envc = count(envp, MAX_ARG_STRINGS); |
1da177e4c Linux-2.6.12-rc2 |
1664 |
if ((retval = bprm->envc) < 0) |
1da177e4c Linux-2.6.12-rc2 |
1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 |
goto out; retval = prepare_binprm(bprm); if (retval < 0) goto out; retval = copy_strings_kernel(1, &bprm->filename, bprm); if (retval < 0) goto out; bprm->exec = bprm->p; retval = copy_strings(bprm->envc, envp, bprm); if (retval < 0) goto out; retval = copy_strings(bprm->argc, argv, bprm); if (retval < 0) goto out; |
21245b863 exec: Ensure mm->... |
1683 |
would_dump(bprm, bprm->file); |
5d1baf3b6 exec: introduce e... |
1684 |
retval = exec_binprm(bprm); |
a6f76f23d CRED: Make execve... |
1685 1686 |
if (retval < 0) goto out; |
1da177e4c Linux-2.6.12-rc2 |
1687 |
|
a6f76f23d CRED: Make execve... |
1688 |
/* execve succeeded */ |
498052bba New locking/refco... |
1689 |
current->fs->in_exec = 0; |
f9ce1f1cd Add in_execve fla... |
1690 |
current->in_execve = 0; |
a6f76f23d CRED: Make execve... |
1691 |
acct_update_integrals(current); |
82727018b sched/numa: Call ... |
1692 |
task_numa_free(current); |
a6f76f23d CRED: Make execve... |
1693 |
free_bprm(bprm); |
51f39a1f0 syscalls: impleme... |
1694 |
kfree(pathbuf); |
c4ad8f98b execve: use 'stru... |
1695 |
putname(filename); |
a6f76f23d CRED: Make execve... |
1696 1697 1698 |
if (displaced) put_files_struct(displaced); return retval; |
1da177e4c Linux-2.6.12-rc2 |
1699 |
|
a6f76f23d CRED: Make execve... |
1700 |
out: |
3c77f8457 exec: make argv/e... |
1701 1702 1703 1704 |
if (bprm->mm) { acct_arg_size(bprm, 0); mmput(bprm->mm); } |
1da177e4c Linux-2.6.12-rc2 |
1705 |
|
498052bba New locking/refco... |
1706 |
out_unmark: |
9e00cdb09 exec:check_unsafe... |
1707 |
current->fs->in_exec = 0; |
f9ce1f1cd Add in_execve fla... |
1708 |
current->in_execve = 0; |
a6f76f23d CRED: Make execve... |
1709 1710 |
out_free: |
08a6fac1c [PATCH] get rid o... |
1711 |
free_bprm(bprm); |
51f39a1f0 syscalls: impleme... |
1712 |
kfree(pathbuf); |
1da177e4c Linux-2.6.12-rc2 |
1713 |
|
fd8328be8 [PATCH] sanitize ... |
1714 |
out_files: |
3b1253880 [PATCH] sanitize ... |
1715 1716 |
if (displaced) reset_files_struct(displaced); |
1da177e4c Linux-2.6.12-rc2 |
1717 |
out_ret: |
c4ad8f98b execve: use 'stru... |
1718 |
putname(filename); |
1da177e4c Linux-2.6.12-rc2 |
1719 1720 |
return retval; } |
c4ad8f98b execve: use 'stru... |
1721 |
int do_execve(struct filename *filename, |
ba2d01629 exec: introduce s... |
1722 |
const char __user *const __user *__argv, |
da3d4c5fa get rid of pt_reg... |
1723 |
const char __user *const __user *__envp) |
ba2d01629 exec: introduce s... |
1724 |
{ |
0e028465d exec: unify do_ex... |
1725 1726 |
struct user_arg_ptr argv = { .ptr.native = __argv }; struct user_arg_ptr envp = { .ptr.native = __envp }; |
51f39a1f0 syscalls: impleme... |
1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 |
return do_execveat_common(AT_FDCWD, filename, argv, envp, 0); } int do_execveat(int fd, struct filename *filename, const char __user *const __user *__argv, const char __user *const __user *__envp, int flags) { struct user_arg_ptr argv = { .ptr.native = __argv }; struct user_arg_ptr envp = { .ptr.native = __envp }; return do_execveat_common(fd, filename, argv, envp, flags); |
0e028465d exec: unify do_ex... |
1739 1740 1741 |
} #ifdef CONFIG_COMPAT |
c4ad8f98b execve: use 'stru... |
1742 |
static int compat_do_execve(struct filename *filename, |
38b983b34 generic sys_execve() |
1743 |
const compat_uptr_t __user *__argv, |
d03d26e58 make compat_do_ex... |
1744 |
const compat_uptr_t __user *__envp) |
0e028465d exec: unify do_ex... |
1745 1746 1747 1748 1749 1750 1751 1752 1753 |
{ struct user_arg_ptr argv = { .is_compat = true, .ptr.compat = __argv, }; struct user_arg_ptr envp = { .is_compat = true, .ptr.compat = __envp, }; |
51f39a1f0 syscalls: impleme... |
1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 |
return do_execveat_common(AT_FDCWD, filename, argv, envp, 0); } static int compat_do_execveat(int fd, struct filename *filename, const compat_uptr_t __user *__argv, const compat_uptr_t __user *__envp, int flags) { struct user_arg_ptr argv = { .is_compat = true, .ptr.compat = __argv, }; struct user_arg_ptr envp = { .is_compat = true, .ptr.compat = __envp, }; return do_execveat_common(fd, filename, argv, envp, flags); |
ba2d01629 exec: introduce s... |
1771 |
} |
0e028465d exec: unify do_ex... |
1772 |
#endif |
ba2d01629 exec: introduce s... |
1773 |
|
964ee7df9 exec: fix set_bin... |
1774 |
void set_binfmt(struct linux_binfmt *new) |
1da177e4c Linux-2.6.12-rc2 |
1775 |
{ |
801460d0c task_struct clean... |
1776 1777 1778 1779 |
struct mm_struct *mm = current->mm; if (mm->binfmt) module_put(mm->binfmt->module); |
1da177e4c Linux-2.6.12-rc2 |
1780 |
|
801460d0c task_struct clean... |
1781 |
mm->binfmt = new; |
964ee7df9 exec: fix set_bin... |
1782 1783 |
if (new) __module_get(new->module); |
1da177e4c Linux-2.6.12-rc2 |
1784 |
} |
1da177e4c Linux-2.6.12-rc2 |
1785 |
EXPORT_SYMBOL(set_binfmt); |
6c5d52382 coredump masking:... |
1786 |
/* |
7288e1187 coredump: kill MM... |
1787 |
* set_dumpable stores three-value SUID_DUMP_* into mm->flags. |
6c5d52382 coredump masking:... |
1788 1789 1790 |
*/ void set_dumpable(struct mm_struct *mm, int value) { |
abacd2fe3 coredump: set_dum... |
1791 |
unsigned long old, new; |
7288e1187 coredump: kill MM... |
1792 1793 |
if (WARN_ON((unsigned)value > SUID_DUMP_ROOT)) return; |
abacd2fe3 coredump: set_dum... |
1794 1795 |
do { old = ACCESS_ONCE(mm->flags); |
7288e1187 coredump: kill MM... |
1796 |
new = (old & ~MMF_DUMPABLE_MASK) | value; |
abacd2fe3 coredump: set_dum... |
1797 |
} while (cmpxchg(&mm->flags, old, new) != old); |
6c5d52382 coredump masking:... |
1798 |
} |
6c5d52382 coredump masking:... |
1799 |
|
38b983b34 generic sys_execve() |
1800 1801 1802 1803 1804 |
SYSCALL_DEFINE3(execve, const char __user *, filename, const char __user *const __user *, argv, const char __user *const __user *, envp) { |
c4ad8f98b execve: use 'stru... |
1805 |
return do_execve(getname(filename), argv, envp); |
38b983b34 generic sys_execve() |
1806 |
} |
51f39a1f0 syscalls: impleme... |
1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 |
SYSCALL_DEFINE5(execveat, int, fd, const char __user *, filename, const char __user *const __user *, argv, const char __user *const __user *, envp, int, flags) { int lookup_flags = (flags & AT_EMPTY_PATH) ? LOOKUP_EMPTY : 0; return do_execveat(fd, getname_flags(filename, lookup_flags, NULL), argv, envp, flags); } |
38b983b34 generic sys_execve() |
1820 |
#ifdef CONFIG_COMPAT |
625b1d7e8 fs/compat: conver... |
1821 1822 1823 |
COMPAT_SYSCALL_DEFINE3(execve, const char __user *, filename, const compat_uptr_t __user *, argv, const compat_uptr_t __user *, envp) |
38b983b34 generic sys_execve() |
1824 |
{ |
c4ad8f98b execve: use 'stru... |
1825 |
return compat_do_execve(getname(filename), argv, envp); |
38b983b34 generic sys_execve() |
1826 |
} |
51f39a1f0 syscalls: impleme... |
1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 |
COMPAT_SYSCALL_DEFINE5(execveat, int, fd, const char __user *, filename, const compat_uptr_t __user *, argv, const compat_uptr_t __user *, envp, int, flags) { int lookup_flags = (flags & AT_EMPTY_PATH) ? LOOKUP_EMPTY : 0; return compat_do_execveat(fd, getname_flags(filename, lookup_flags, NULL), argv, envp, flags); } |
38b983b34 generic sys_execve() |
1840 |
#endif |