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fs/exec.c
42.8 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 * formats. */ |
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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; #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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/* * We are doing an exec(). 'current' is the process * doing the exec and bprm->mm is the new process's mm. */ ret = get_user_pages_remote(current, bprm->mm, pos, 1, write, 1, &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 |
38b983b34 generic sys_execve() |
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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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411 |
} |
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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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419 |
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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443 |
*/ |
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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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|
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len = strnlen_user(str, MAX_ARG_STRLEN); if (!len) goto out; ret = -E2BIG; if (!valid_arg_len(bprm, len)) |
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goto out; |
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|
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/* We're going to work our way backwords. */ |
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pos = bprm->p; |
b6a2fea39 mm: variable leng... |
471 472 |
str += len; bprm->p -= len; |
1da177e4c Linux-2.6.12-rc2 |
473 474 |
while (len > 0) { |
1da177e4c Linux-2.6.12-rc2 |
475 |
int offset, bytes_to_copy; |
1da177e4c Linux-2.6.12-rc2 |
476 |
|
9aea5a65a execve: make resp... |
477 478 479 480 |
if (fatal_signal_pending(current)) { ret = -ERESTARTNOHAND; goto out; } |
7993bc1f4 execve: improve i... |
481 |
cond_resched(); |
1da177e4c Linux-2.6.12-rc2 |
482 |
offset = pos % PAGE_SIZE; |
b6a2fea39 mm: variable leng... |
483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 |
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 |
499 |
if (!page) { |
b6a2fea39 mm: variable leng... |
500 |
ret = -E2BIG; |
1da177e4c Linux-2.6.12-rc2 |
501 502 |
goto out; } |
1da177e4c Linux-2.6.12-rc2 |
503 |
|
b6a2fea39 mm: variable leng... |
504 505 |
if (kmapped_page) { flush_kernel_dcache_page(kmapped_page); |
1da177e4c Linux-2.6.12-rc2 |
506 |
kunmap(kmapped_page); |
b6a2fea39 mm: variable leng... |
507 508 |
put_arg_page(kmapped_page); } |
1da177e4c Linux-2.6.12-rc2 |
509 510 |
kmapped_page = page; kaddr = kmap(kmapped_page); |
b6a2fea39 mm: variable leng... |
511 512 |
kpos = pos & PAGE_MASK; flush_arg_page(bprm, kpos, kmapped_page); |
1da177e4c Linux-2.6.12-rc2 |
513 |
} |
b6a2fea39 mm: variable leng... |
514 |
if (copy_from_user(kaddr+offset, str, bytes_to_copy)) { |
1da177e4c Linux-2.6.12-rc2 |
515 516 517 |
ret = -EFAULT; goto out; } |
1da177e4c Linux-2.6.12-rc2 |
518 519 520 521 |
} } ret = 0; out: |
b6a2fea39 mm: variable leng... |
522 523 |
if (kmapped_page) { flush_kernel_dcache_page(kmapped_page); |
1da177e4c Linux-2.6.12-rc2 |
524 |
kunmap(kmapped_page); |
b6a2fea39 mm: variable leng... |
525 526 |
put_arg_page(kmapped_page); } |
1da177e4c Linux-2.6.12-rc2 |
527 528 529 530 531 532 |
return ret; } /* * Like copy_strings, but get argv and its values from kernel memory. */ |
ba2d01629 exec: introduce s... |
533 |
int copy_strings_kernel(int argc, const char *const *__argv, |
d7627467b Make do_execve() ... |
534 |
struct linux_binprm *bprm) |
1da177e4c Linux-2.6.12-rc2 |
535 536 537 |
{ int r; mm_segment_t oldfs = get_fs(); |
ba2d01629 exec: introduce s... |
538 |
struct user_arg_ptr argv = { |
0e028465d exec: unify do_ex... |
539 |
.ptr.native = (const char __user *const __user *)__argv, |
ba2d01629 exec: introduce s... |
540 |
}; |
1da177e4c Linux-2.6.12-rc2 |
541 |
set_fs(KERNEL_DS); |
ba2d01629 exec: introduce s... |
542 |
r = copy_strings(argc, argv, bprm); |
1da177e4c Linux-2.6.12-rc2 |
543 |
set_fs(oldfs); |
ba2d01629 exec: introduce s... |
544 |
|
1da177e4c Linux-2.6.12-rc2 |
545 546 |
return r; } |
1da177e4c Linux-2.6.12-rc2 |
547 548 549 |
EXPORT_SYMBOL(copy_strings_kernel); #ifdef CONFIG_MMU |
b6a2fea39 mm: variable leng... |
550 |
|
1da177e4c Linux-2.6.12-rc2 |
551 |
/* |
b6a2fea39 mm: variable leng... |
552 553 554 |
* 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 |
555 |
* |
b6a2fea39 mm: variable leng... |
556 557 558 559 560 561 |
* 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 |
562 |
*/ |
b6a2fea39 mm: variable leng... |
563 |
static int shift_arg_pages(struct vm_area_struct *vma, unsigned long shift) |
1da177e4c Linux-2.6.12-rc2 |
564 565 |
{ struct mm_struct *mm = vma->vm_mm; |
b6a2fea39 mm: variable leng... |
566 567 568 569 570 |
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... |
571 |
struct mmu_gather tlb; |
1da177e4c Linux-2.6.12-rc2 |
572 |
|
b6a2fea39 mm: variable leng... |
573 |
BUG_ON(new_start > new_end); |
1da177e4c Linux-2.6.12-rc2 |
574 |
|
b6a2fea39 mm: variable leng... |
575 576 577 578 579 580 581 582 583 584 |
/* * 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... |
585 586 |
if (vma_adjust(vma, new_start, old_end, vma->vm_pgoff, NULL)) return -ENOMEM; |
b6a2fea39 mm: variable leng... |
587 588 589 590 591 592 |
/* * 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 ... |
593 |
vma, new_start, length, false)) |
b6a2fea39 mm: variable leng... |
594 595 596 |
return -ENOMEM; lru_add_drain(); |
2b047252d Fix TLB gather vi... |
597 |
tlb_gather_mmu(&tlb, mm, old_start, old_end); |
b6a2fea39 mm: variable leng... |
598 599 600 601 |
if (new_end > old_start) { /* * when the old and new regions overlap clear from new_end. */ |
d16dfc550 mm: mmu_gather re... |
602 |
free_pgd_range(&tlb, new_end, old_end, new_end, |
6ee8630e0 mm: allow arch co... |
603 |
vma->vm_next ? vma->vm_next->vm_start : USER_PGTABLES_CEILING); |
b6a2fea39 mm: variable leng... |
604 605 606 607 608 609 610 |
} 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... |
611 |
free_pgd_range(&tlb, old_start, old_end, new_end, |
6ee8630e0 mm: allow arch co... |
612 |
vma->vm_next ? vma->vm_next->vm_start : USER_PGTABLES_CEILING); |
1da177e4c Linux-2.6.12-rc2 |
613 |
} |
2b047252d Fix TLB gather vi... |
614 |
tlb_finish_mmu(&tlb, old_start, old_end); |
b6a2fea39 mm: variable leng... |
615 616 |
/* |
5beb49305 mm: change anon_v... |
617 |
* Shrink the vma to just the new range. Always succeeds. |
b6a2fea39 mm: variable leng... |
618 619 620 621 |
*/ vma_adjust(vma, new_start, new_end, vma->vm_pgoff, NULL); return 0; |
1da177e4c Linux-2.6.12-rc2 |
622 |
} |
b6a2fea39 mm: variable leng... |
623 624 625 626 |
/* * 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 |
627 628 629 630 |
int setup_arg_pages(struct linux_binprm *bprm, unsigned long stack_top, int executable_stack) { |
b6a2fea39 mm: variable leng... |
631 632 |
unsigned long ret; unsigned long stack_shift; |
1da177e4c Linux-2.6.12-rc2 |
633 |
struct mm_struct *mm = current->mm; |
b6a2fea39 mm: variable leng... |
634 635 636 637 |
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... |
638 639 640 |
unsigned long stack_size; unsigned long stack_expand; unsigned long rlim_stack; |
1da177e4c Linux-2.6.12-rc2 |
641 642 |
#ifdef CONFIG_STACK_GROWSUP |
d71f290b4 metag: Reduce max... |
643 |
/* Limit stack size */ |
d554ed895 fs: use rlimit he... |
644 |
stack_base = rlimit_max(RLIMIT_STACK); |
d71f290b4 metag: Reduce max... |
645 646 |
if (stack_base > STACK_SIZE_MAX) stack_base = STACK_SIZE_MAX; |
1da177e4c Linux-2.6.12-rc2 |
647 |
|
d045c77c1 parisc,metag: Fix... |
648 649 |
/* Add space for stack randomization. */ stack_base += (STACK_RND_MASK << PAGE_SHIFT); |
b6a2fea39 mm: variable leng... |
650 651 652 |
/* 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 |
653 |
|
b6a2fea39 mm: variable leng... |
654 |
stack_base = PAGE_ALIGN(stack_top - stack_base); |
1da177e4c Linux-2.6.12-rc2 |
655 |
|
b6a2fea39 mm: variable leng... |
656 657 658 |
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 |
659 |
#else |
b6a2fea39 mm: variable leng... |
660 661 |
stack_top = arch_align_stack(stack_top); stack_top = PAGE_ALIGN(stack_top); |
1b528181b setup_arg_pages: ... |
662 663 664 665 |
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... |
666 667 668 |
stack_shift = vma->vm_end - stack_top; bprm->p -= stack_shift; |
1da177e4c Linux-2.6.12-rc2 |
669 |
mm->arg_start = bprm->p; |
1da177e4c Linux-2.6.12-rc2 |
670 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
671 |
if (bprm->loader) |
b6a2fea39 mm: variable leng... |
672 673 |
bprm->loader -= stack_shift; bprm->exec -= stack_shift; |
1da177e4c Linux-2.6.12-rc2 |
674 |
|
f268dfe90 exec: make exec p... |
675 676 |
if (down_write_killable(&mm->mmap_sem)) return -EINTR; |
96a8e13ed exec: fix stack e... |
677 |
vm_flags = VM_STACK_FLAGS; |
b6a2fea39 mm: variable leng... |
678 679 680 681 682 683 684 685 686 687 688 |
/* * 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... |
689 |
vm_flags |= VM_STACK_INCOMPLETE_SETUP; |
b6a2fea39 mm: variable leng... |
690 691 692 693 694 695 696 697 698 699 |
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... |
700 701 |
if (ret) goto out_unlock; |
1da177e4c Linux-2.6.12-rc2 |
702 |
} |
a8bef8ff6 mm: migration: av... |
703 704 |
/* mprotect_fixup is overkill to remove the temporary stack flags */ vma->vm_flags &= ~VM_STACK_INCOMPLETE_SETUP; |
5ef097dd7 exec: create init... |
705 |
stack_expand = 131072UL; /* randomly 32*4k (or 2*64k) pages */ |
803bf5ec2 fs/exec.c: restri... |
706 707 708 709 710 711 |
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... |
712 |
#ifdef CONFIG_STACK_GROWSUP |
803bf5ec2 fs/exec.c: restri... |
713 714 715 716 |
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... |
717 |
#else |
803bf5ec2 fs/exec.c: restri... |
718 719 720 721 |
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... |
722 |
#endif |
3af9e8592 perf: Add non-exe... |
723 |
current->mm->start_stack = bprm->p; |
b6a2fea39 mm: variable leng... |
724 725 726 727 728 |
ret = expand_stack(vma, stack_base); if (ret) ret = -EFAULT; out_unlock: |
1da177e4c Linux-2.6.12-rc2 |
729 |
up_write(&mm->mmap_sem); |
fc63cf237 exec: setup_arg_p... |
730 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
731 |
} |
1da177e4c Linux-2.6.12-rc2 |
732 |
EXPORT_SYMBOL(setup_arg_pages); |
1da177e4c Linux-2.6.12-rc2 |
733 |
#endif /* CONFIG_MMU */ |
51f39a1f0 syscalls: impleme... |
734 |
static struct file *do_open_execat(int fd, struct filename *name, int flags) |
1da177e4c Linux-2.6.12-rc2 |
735 |
{ |
1da177e4c Linux-2.6.12-rc2 |
736 |
struct file *file; |
e56b6a5dd Re: [PATCH 3/6] v... |
737 |
int err; |
51f39a1f0 syscalls: impleme... |
738 |
struct open_flags open_exec_flags = { |
47c805dc2 switch do_filp_op... |
739 |
.open_flag = O_LARGEFILE | O_RDONLY | __FMODE_EXEC, |
62fb4a155 don't carry MAY_O... |
740 |
.acc_mode = MAY_EXEC, |
f9652e10c allow build_open_... |
741 742 |
.intent = LOOKUP_OPEN, .lookup_flags = LOOKUP_FOLLOW, |
47c805dc2 switch do_filp_op... |
743 |
}; |
1da177e4c Linux-2.6.12-rc2 |
744 |
|
51f39a1f0 syscalls: impleme... |
745 746 747 748 749 750 751 752 |
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(... |
753 |
if (IS_ERR(file)) |
e56b6a5dd Re: [PATCH 3/6] v... |
754 755 756 |
goto out; err = -EACCES; |
496ad9aa8 new helper: file_... |
757 |
if (!S_ISREG(file_inode(file)->i_mode)) |
6e8341a11 Switch open_exec(... |
758 |
goto exit; |
e56b6a5dd Re: [PATCH 3/6] v... |
759 |
|
90f8572b0 vfs: Commit to ne... |
760 |
if (path_noexec(&file->f_path)) |
6e8341a11 Switch open_exec(... |
761 |
goto exit; |
e56b6a5dd Re: [PATCH 3/6] v... |
762 763 |
err = deny_write_access(file); |
6e8341a11 Switch open_exec(... |
764 765 |
if (err) goto exit; |
1da177e4c Linux-2.6.12-rc2 |
766 |
|
51f39a1f0 syscalls: impleme... |
767 768 |
if (name->name[0] != '\0') fsnotify_open(file); |
6e8341a11 Switch open_exec(... |
769 |
out: |
e56b6a5dd Re: [PATCH 3/6] v... |
770 |
return file; |
6e8341a11 Switch open_exec(... |
771 772 |
exit: fput(file); |
e56b6a5dd Re: [PATCH 3/6] v... |
773 774 |
return ERR_PTR(err); } |
c4ad8f98b execve: use 'stru... |
775 776 777 |
struct file *open_exec(const char *name) { |
516891041 fs: create proper... |
778 779 780 781 782 783 784 785 |
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... |
786 |
} |
1da177e4c Linux-2.6.12-rc2 |
787 |
EXPORT_SYMBOL(open_exec); |
6777d773a kernel_read: rede... |
788 789 |
int kernel_read(struct file *file, loff_t offset, char *addr, unsigned long count) |
1da177e4c Linux-2.6.12-rc2 |
790 791 792 793 794 795 796 797 798 799 800 801 802 803 |
{ 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... |
804 |
int kernel_read_file(struct file *file, void **buf, loff_t *size, |
bc8ca5b92 vfs: define kerne... |
805 |
loff_t max_size, enum kernel_read_file_id id) |
b44a7dfc6 vfs: define a gen... |
806 807 808 809 810 811 812 |
{ 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 ... |
813 814 815 |
ret = security_kernel_read_file(file, id); if (ret) return ret; |
39d637af5 vfs: forbid write... |
816 817 818 |
ret = deny_write_access(file); if (ret) return ret; |
b44a7dfc6 vfs: define a gen... |
819 |
i_size = i_size_read(file_inode(file)); |
39d637af5 vfs: forbid write... |
820 821 822 823 824 825 826 827 |
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... |
828 829 |
*buf = vmalloc(i_size); |
39d637af5 vfs: forbid write... |
830 831 832 833 |
if (!*buf) { ret = -ENOMEM; goto out; } |
b44a7dfc6 vfs: define a gen... |
834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 |
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... |
851 |
goto out_free; |
b44a7dfc6 vfs: define a gen... |
852 |
} |
bc8ca5b92 vfs: define kerne... |
853 |
ret = security_kernel_post_read_file(file, *buf, i_size, id); |
b44a7dfc6 vfs: define a gen... |
854 855 |
if (!ret) *size = pos; |
39d637af5 vfs: forbid write... |
856 |
out_free: |
b44a7dfc6 vfs: define a gen... |
857 858 859 860 |
if (ret < 0) { vfree(*buf); *buf = NULL; } |
39d637af5 vfs: forbid write... |
861 862 863 |
out: allow_write_access(file); |
b44a7dfc6 vfs: define a gen... |
864 865 866 |
return ret; } EXPORT_SYMBOL_GPL(kernel_read_file); |
09596b94f vfs: define kerne... |
867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 |
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... |
885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 |
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_... |
900 901 |
ssize_t read_code(struct file *file, unsigned long addr, loff_t pos, size_t len) { |
ec6955798 read_code(): go t... |
902 |
ssize_t res = vfs_read(file, (void __user *)addr, len, &pos); |
3dc20cb28 new helper: read_... |
903 904 905 906 907 |
if (res > 0) flush_icache_range(addr, addr + len); return res; } EXPORT_SYMBOL(read_code); |
1da177e4c Linux-2.6.12-rc2 |
908 909 910 |
static int exec_mmap(struct mm_struct *mm) { struct task_struct *tsk; |
615d6e875 mm: per-thread vm... |
911 |
struct mm_struct *old_mm, *active_mm; |
1da177e4c Linux-2.6.12-rc2 |
912 913 914 915 916 917 918 |
/* 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... |
919 |
sync_mm_rss(old_mm); |
1da177e4c Linux-2.6.12-rc2 |
920 921 922 923 |
/* * 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... |
924 |
* checking core_state and changing tsk->mm. |
1da177e4c Linux-2.6.12-rc2 |
925 926 |
*/ down_read(&old_mm->mmap_sem); |
999d9fc16 coredump: move mm... |
927 |
if (unlikely(old_mm->core_state)) { |
1da177e4c Linux-2.6.12-rc2 |
928 929 930 931 932 933 934 935 936 |
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... |
937 938 |
tsk->mm->vmacache_seqnum = 0; vmacache_flush(tsk); |
1da177e4c Linux-2.6.12-rc2 |
939 |
task_unlock(tsk); |
1da177e4c Linux-2.6.12-rc2 |
940 941 |
if (old_mm) { up_read(&old_mm->mmap_sem); |
7dddb12c6 BUG_ON() Conversi... |
942 |
BUG_ON(active_mm != old_mm); |
701085b21 exec: move de_thr... |
943 |
setmax_mm_hiwater_rss(&tsk->signal->maxrss, old_mm); |
31a78f23b mm owner: fix rac... |
944 |
mm_update_next_owner(old_mm); |
1da177e4c Linux-2.6.12-rc2 |
945 946 947 948 949 950 951 952 953 954 955 956 957 |
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... |
958 |
static int de_thread(struct task_struct *tsk) |
1da177e4c Linux-2.6.12-rc2 |
959 960 |
{ struct signal_struct *sig = tsk->signal; |
b2c903b87 exec: simplify th... |
961 |
struct sighand_struct *oldsighand = tsk->sighand; |
1da177e4c Linux-2.6.12-rc2 |
962 |
spinlock_t *lock = &oldsighand->siglock; |
1da177e4c Linux-2.6.12-rc2 |
963 |
|
aafe6c2a2 [PATCH] de_thread... |
964 |
if (thread_group_empty(tsk)) |
1da177e4c Linux-2.6.12-rc2 |
965 966 967 968 |
goto no_thread_group; /* * Kill all other threads in the thread group. |
1da177e4c Linux-2.6.12-rc2 |
969 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
970 |
spin_lock_irq(lock); |
ed5d2cac1 exec: rework the ... |
971 |
if (signal_group_exit(sig)) { |
1da177e4c Linux-2.6.12-rc2 |
972 973 974 975 976 |
/* * Another group action in progress, just * return so that the signal is processed. */ spin_unlock_irq(lock); |
1da177e4c Linux-2.6.12-rc2 |
977 978 |
return -EAGAIN; } |
d344193a0 exit: avoid sig->... |
979 |
|
ed5d2cac1 exec: rework the ... |
980 |
sig->group_exit_task = tsk; |
d344193a0 exit: avoid sig->... |
981 982 983 |
sig->notify_count = zap_other_threads(tsk); if (!thread_group_leader(tsk)) sig->notify_count--; |
1da177e4c Linux-2.6.12-rc2 |
984 |
|
d344193a0 exit: avoid sig->... |
985 |
while (sig->notify_count) { |
d5bbd43d5 exec: make de_thr... |
986 |
__set_current_state(TASK_KILLABLE); |
1da177e4c Linux-2.6.12-rc2 |
987 988 |
spin_unlock_irq(lock); schedule(); |
d5bbd43d5 exec: make de_thr... |
989 990 |
if (unlikely(__fatal_signal_pending(tsk))) goto killed; |
1da177e4c Linux-2.6.12-rc2 |
991 992 |
spin_lock_irq(lock); } |
1da177e4c Linux-2.6.12-rc2 |
993 994 995 996 997 998 999 |
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... |
1000 |
if (!thread_group_leader(tsk)) { |
8187926bd posix-timers: sim... |
1001 |
struct task_struct *leader = tsk->group_leader; |
6db840fa7 exec: RT sub-thre... |
1002 |
|
6db840fa7 exec: RT sub-thre... |
1003 |
for (;;) { |
e56fb2874 exec: do not abus... |
1004 |
threadgroup_change_begin(tsk); |
6db840fa7 exec: RT sub-thre... |
1005 |
write_lock_irq(&tasklist_lock); |
dfcce791f fs/exec.c:de_thre... |
1006 1007 1008 1009 1010 |
/* * 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... |
1011 1012 |
if (likely(leader->exit_state)) break; |
d5bbd43d5 exec: make de_thr... |
1013 |
__set_current_state(TASK_KILLABLE); |
6db840fa7 exec: RT sub-thre... |
1014 |
write_unlock_irq(&tasklist_lock); |
e56fb2874 exec: do not abus... |
1015 |
threadgroup_change_end(tsk); |
6db840fa7 exec: RT sub-thre... |
1016 |
schedule(); |
d5bbd43d5 exec: make de_thr... |
1017 1018 |
if (unlikely(__fatal_signal_pending(tsk))) goto killed; |
6db840fa7 exec: RT sub-thre... |
1019 |
} |
1da177e4c Linux-2.6.12-rc2 |
1020 |
|
f5e902817 [PATCH] process a... |
1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 |
/* * 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... |
1031 |
tsk->start_time = leader->start_time; |
266b7a021 fs/exec.c:de_thre... |
1032 |
tsk->real_start_time = leader->real_start_time; |
f5e902817 [PATCH] process a... |
1033 |
|
bac0abd61 Isolate some expl... |
1034 1035 |
BUG_ON(!same_thread_group(leader, tsk)); BUG_ON(has_group_leader_pid(tsk)); |
1da177e4c Linux-2.6.12-rc2 |
1036 1037 1038 1039 1040 1041 |
/* * 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: ... |
1042 1043 |
/* Become a process group leader with the old leader's pid. |
c18258c6f [PATCH] pid: Impl... |
1044 1045 |
* 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: ... |
1046 1047 |
* is called. Odd but simple and correct. */ |
aafe6c2a2 [PATCH] de_thread... |
1048 |
tsk->pid = leader->pid; |
3f4185483 fs/exec.c:de_thre... |
1049 |
change_pid(tsk, PIDTYPE_PID, task_pid(leader)); |
aafe6c2a2 [PATCH] de_thread... |
1050 1051 |
transfer_pid(leader, tsk, PIDTYPE_PGID); transfer_pid(leader, tsk, PIDTYPE_SID); |
9cd80bbb0 do_wait() optimiz... |
1052 |
|
aafe6c2a2 [PATCH] de_thread... |
1053 |
list_replace_rcu(&leader->tasks, &tsk->tasks); |
9cd80bbb0 do_wait() optimiz... |
1054 |
list_replace_init(&leader->sibling, &tsk->sibling); |
1da177e4c Linux-2.6.12-rc2 |
1055 |
|
aafe6c2a2 [PATCH] de_thread... |
1056 1057 |
tsk->group_leader = tsk; leader->group_leader = tsk; |
de12a7878 [PATCH] de_thread... |
1058 |
|
aafe6c2a2 [PATCH] de_thread... |
1059 |
tsk->exit_signal = SIGCHLD; |
087806b12 redefine thread_g... |
1060 |
leader->exit_signal = -1; |
962b564cf [PATCH] fix do_wa... |
1061 1062 1063 |
BUG_ON(leader->exit_state != EXIT_ZOMBIE); leader->exit_state = EXIT_DEAD; |
eac1b5e57 ptrace: do_wait(t... |
1064 1065 1066 1067 1068 1069 1070 1071 |
/* * 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 |
1072 |
write_unlock_irq(&tasklist_lock); |
e56fb2874 exec: do not abus... |
1073 |
threadgroup_change_end(tsk); |
8187926bd posix-timers: sim... |
1074 1075 |
release_task(leader); |
ed5d2cac1 exec: rework the ... |
1076 |
} |
1da177e4c Linux-2.6.12-rc2 |
1077 |
|
6db840fa7 exec: RT sub-thre... |
1078 1079 |
sig->group_exit_task = NULL; sig->notify_count = 0; |
1da177e4c Linux-2.6.12-rc2 |
1080 1081 |
no_thread_group: |
e63682534 exit_signal: simp... |
1082 1083 |
/* we have changed execution domain */ tsk->exit_signal = SIGCHLD; |
1da177e4c Linux-2.6.12-rc2 |
1084 |
exit_itimers(sig); |
cbaffba12 posix timers: dis... |
1085 |
flush_itimer_signals(); |
329f7dba5 [PATCH] fix de_th... |
1086 |
|
b2c903b87 exec: simplify th... |
1087 1088 |
if (atomic_read(&oldsighand->count) != 1) { struct sighand_struct *newsighand; |
1da177e4c Linux-2.6.12-rc2 |
1089 |
/* |
b2c903b87 exec: simplify th... |
1090 1091 |
* This ->sighand is shared with the CLONE_SIGHAND * but not CLONE_THREAD task, switch to the new one. |
1da177e4c Linux-2.6.12-rc2 |
1092 |
*/ |
b2c903b87 exec: simplify th... |
1093 1094 1095 |
newsighand = kmem_cache_alloc(sighand_cachep, GFP_KERNEL); if (!newsighand) return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
1096 1097 1098 1099 1100 1101 |
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... |
1102 |
rcu_assign_pointer(tsk->sighand, newsighand); |
1da177e4c Linux-2.6.12-rc2 |
1103 1104 |
spin_unlock(&oldsighand->siglock); write_unlock_irq(&tasklist_lock); |
fba2afaae signal/timer/even... |
1105 |
__cleanup_sighand(oldsighand); |
1da177e4c Linux-2.6.12-rc2 |
1106 |
} |
aafe6c2a2 [PATCH] de_thread... |
1107 |
BUG_ON(!thread_group_leader(tsk)); |
1da177e4c Linux-2.6.12-rc2 |
1108 |
return 0; |
d5bbd43d5 exec: make de_thr... |
1109 1110 1111 1112 1113 1114 1115 1116 |
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 |
1117 |
} |
0840a90d9 exec: simplify ->... |
1118 |
|
59714d65d get_task_comm(): ... |
1119 |
char *get_task_comm(char *buf, struct task_struct *tsk) |
1da177e4c Linux-2.6.12-rc2 |
1120 1121 1122 1123 1124 |
{ /* 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(): ... |
1125 |
return buf; |
1da177e4c Linux-2.6.12-rc2 |
1126 |
} |
7d74f492e export kernel cal... |
1127 |
EXPORT_SYMBOL_GPL(get_task_comm); |
1da177e4c Linux-2.6.12-rc2 |
1128 |
|
6a6d27de3 take close-on-exe... |
1129 1130 1131 1132 |
/* * These functions flushes out all traces of the currently running executable * so that a new one can be started */ |
82b897782 perf: Differentia... |
1133 |
void __set_task_comm(struct task_struct *tsk, const char *buf, bool exec) |
1da177e4c Linux-2.6.12-rc2 |
1134 1135 |
{ task_lock(tsk); |
43d2b1132 tracepoint: add t... |
1136 |
trace_task_rename(tsk, buf); |
1da177e4c Linux-2.6.12-rc2 |
1137 1138 |
strlcpy(tsk->comm, buf, sizeof(tsk->comm)); task_unlock(tsk); |
82b897782 perf: Differentia... |
1139 |
perf_event_comm(tsk, exec); |
1da177e4c Linux-2.6.12-rc2 |
1140 1141 1142 1143 |
} int flush_old_exec(struct linux_binprm * bprm) { |
221af7f87 Split 'flush_old_... |
1144 |
int retval; |
1da177e4c Linux-2.6.12-rc2 |
1145 1146 1147 1148 1149 1150 1151 1152 |
/* * 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... |
1153 1154 1155 1156 1157 |
/* * 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... |
1158 |
set_mm_exe_file(bprm->mm, bprm->file); |
6e399cd14 prctl: avoid usin... |
1159 |
|
1da177e4c Linux-2.6.12-rc2 |
1160 |
/* |
1da177e4c Linux-2.6.12-rc2 |
1161 1162 |
* Release all of the old mmap stuff */ |
3c77f8457 exec: make argv/e... |
1163 |
acct_arg_size(bprm, 0); |
1da177e4c Linux-2.6.12-rc2 |
1164 1165 |
retval = exec_mmap(bprm->mm); if (retval) |
fd8328be8 [PATCH] sanitize ... |
1166 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
1167 1168 |
bprm->mm = NULL; /* We're using it now */ |
7ab02af42 Fix 'flush_old_ex... |
1169 |
|
dac853ae8 exec: delay addre... |
1170 |
set_fs(USER_DS); |
b88fae644 exec: avoid propa... |
1171 1172 |
current->flags &= ~(PF_RANDOMIZE | PF_FORKNOEXEC | PF_KTHREAD | PF_NOFREEZE | PF_NO_SETAFFINITY); |
7ab02af42 Fix 'flush_old_ex... |
1173 1174 |
flush_thread(); current->personality &= ~bprm->per_clear; |
221af7f87 Split 'flush_old_... |
1175 1176 1177 1178 1179 1180 |
return 0; out: return retval; } EXPORT_SYMBOL(flush_old_exec); |
1b5d783c9 consolidate BINPR... |
1181 1182 |
void would_dump(struct linux_binprm *bprm, struct file *file) { |
496ad9aa8 new helper: file_... |
1183 |
if (inode_permission(file_inode(file), MAY_READ) < 0) |
1b5d783c9 consolidate BINPR... |
1184 1185 1186 |
bprm->interp_flags |= BINPRM_FLAGS_ENFORCE_NONDUMP; } EXPORT_SYMBOL(would_dump); |
221af7f87 Split 'flush_old_... |
1187 1188 |
void setup_new_exec(struct linux_binprm * bprm) { |
221af7f87 Split 'flush_old_... |
1189 |
arch_pick_mmap_layout(current->mm); |
1da177e4c Linux-2.6.12-rc2 |
1190 1191 |
/* This is the point of no return */ |
1da177e4c Linux-2.6.12-rc2 |
1192 |
current->sas_ss_sp = current->sas_ss_size = 0; |
8e96e3b7b userns: Use uid_e... |
1193 |
if (uid_eq(current_euid(), current_uid()) && gid_eq(current_egid(), current_gid())) |
e579d2c25 coredump: remove ... |
1194 |
set_dumpable(current->mm, SUID_DUMP_USER); |
d6e711448 [PATCH] setuid co... |
1195 |
else |
6c5d52382 coredump masking:... |
1196 |
set_dumpable(current->mm, suid_dumpable); |
d6e711448 [PATCH] setuid co... |
1197 |
|
e041e328c perf: Fix perf_ev... |
1198 |
perf_event_exec(); |
82b897782 perf: Differentia... |
1199 |
__set_task_comm(current, kbasename(bprm->filename), true); |
1da177e4c Linux-2.6.12-rc2 |
1200 |
|
0551fbd29 [PATCH] Add mm->t... |
1201 1202 1203 1204 1205 |
/* 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... |
1206 |
/* install the new credentials */ |
8e96e3b7b userns: Use uid_e... |
1207 1208 |
if (!uid_eq(bprm->cred->uid, current_euid()) || !gid_eq(bprm->cred->gid, current_egid())) { |
d2d56c5f5 Reset current->pd... |
1209 |
current->pdeath_signal = 0; |
1b5d783c9 consolidate BINPR... |
1210 1211 1212 1213 |
} else { would_dump(bprm, bprm->file); if (bprm->interp_flags & BINPRM_FLAGS_ENFORCE_NONDUMP) set_dumpable(current->mm, suid_dumpable); |
1da177e4c Linux-2.6.12-rc2 |
1214 1215 1216 1217 |
} /* An exec changes our domain. We are no longer part of the thread group */ |
1da177e4c Linux-2.6.12-rc2 |
1218 |
current->self_exec_id++; |
1da177e4c Linux-2.6.12-rc2 |
1219 |
flush_signal_handlers(current, 0); |
6a6d27de3 take close-on-exe... |
1220 |
do_close_on_exec(current->files); |
1da177e4c Linux-2.6.12-rc2 |
1221 |
} |
221af7f87 Split 'flush_old_... |
1222 |
EXPORT_SYMBOL(setup_new_exec); |
1da177e4c Linux-2.6.12-rc2 |
1223 |
|
a6f76f23d CRED: Make execve... |
1224 |
/* |
a2a8474c3 exec: do not slee... |
1225 1226 1227 1228 1229 1230 1231 |
* 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... |
1232 |
if (mutex_lock_interruptible(¤t->signal->cred_guard_mutex)) |
a2a8474c3 exec: do not slee... |
1233 1234 1235 1236 1237 |
return -ERESTARTNOINTR; bprm->cred = prepare_exec_creds(); if (likely(bprm->cred)) return 0; |
9b1bf12d5 signals: move cre... |
1238 |
mutex_unlock(¤t->signal->cred_guard_mutex); |
a2a8474c3 exec: do not slee... |
1239 1240 |
return -ENOMEM; } |
c4ad8f98b execve: use 'stru... |
1241 |
static void free_bprm(struct linux_binprm *bprm) |
a2a8474c3 exec: do not slee... |
1242 1243 1244 |
{ free_arg_pages(bprm); if (bprm->cred) { |
9b1bf12d5 signals: move cre... |
1245 |
mutex_unlock(¤t->signal->cred_guard_mutex); |
a2a8474c3 exec: do not slee... |
1246 1247 |
abort_creds(bprm->cred); } |
63e46b95e exec: move the fi... |
1248 1249 1250 1251 |
if (bprm->file) { allow_write_access(bprm->file); fput(bprm->file); } |
b66c59840 exec: do not leav... |
1252 1253 1254 |
/* If a binfmt changed the interp, free it. */ if (bprm->interp != bprm->filename) kfree(bprm->interp); |
a2a8474c3 exec: do not slee... |
1255 1256 |
kfree(bprm); } |
b66c59840 exec: do not leav... |
1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 |
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... |
1268 |
/* |
a6f76f23d CRED: Make execve... |
1269 1270 1271 1272 1273 1274 1275 1276 |
* 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... |
1277 1278 1279 1280 1281 1282 1283 1284 1285 |
/* * 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... |
1286 1287 |
/* * cred_guard_mutex must be held at least to this point to prevent |
a6f76f23d CRED: Make execve... |
1288 |
* ptrace_attach() from altering our determination of the task's |
a2a8474c3 exec: do not slee... |
1289 1290 |
* credentials; any time after this it may be unlocked. */ |
a6f76f23d CRED: Make execve... |
1291 |
security_bprm_committed_creds(bprm); |
9b1bf12d5 signals: move cre... |
1292 |
mutex_unlock(¤t->signal->cred_guard_mutex); |
a6f76f23d CRED: Make execve... |
1293 1294 1295 1296 1297 |
} EXPORT_SYMBOL(install_exec_creds); /* * determine how safe it is to execute the proposed program |
9b1bf12d5 signals: move cre... |
1298 |
* - the caller must hold ->cred_guard_mutex to protect against |
c2e1f2e30 seccomp: implemen... |
1299 |
* PTRACE_ATTACH or seccomp thread-sync |
a6f76f23d CRED: Make execve... |
1300 |
*/ |
9e00cdb09 exec:check_unsafe... |
1301 |
static void check_unsafe_exec(struct linux_binprm *bprm) |
a6f76f23d CRED: Make execve... |
1302 |
{ |
0bf2f3aec CRED: Fix SUID ex... |
1303 |
struct task_struct *p = current, *t; |
f1191b50e check_unsafe_exec... |
1304 |
unsigned n_fs; |
a6f76f23d CRED: Make execve... |
1305 |
|
4b9d33e6d ptrace: kill clon... |
1306 1307 1308 1309 1310 1311 |
if (p->ptrace) { if (p->ptrace & PT_PTRACE_CAP) bprm->unsafe |= LSM_UNSAFE_PTRACE_CAP; else bprm->unsafe |= LSM_UNSAFE_PTRACE; } |
a6f76f23d CRED: Make execve... |
1312 |
|
259e5e6c7 Add PR_{GET,SET}_... |
1313 1314 1315 1316 |
/* * This isn't strictly necessary, but it makes it harder for LSMs to * mess up. */ |
1d4457f99 sched: move no_ne... |
1317 |
if (task_no_new_privs(current)) |
259e5e6c7 Add PR_{GET,SET}_... |
1318 |
bprm->unsafe |= LSM_UNSAFE_NO_NEW_PRIVS; |
83f62a2ea exec:check_unsafe... |
1319 |
t = p; |
0bf2f3aec CRED: Fix SUID ex... |
1320 |
n_fs = 1; |
2a4419b5b fs: fs_struct rwl... |
1321 |
spin_lock(&p->fs->lock); |
437f7fdb6 check_unsafe_exec... |
1322 |
rcu_read_lock(); |
83f62a2ea exec:check_unsafe... |
1323 |
while_each_thread(p, t) { |
0bf2f3aec CRED: Fix SUID ex... |
1324 1325 |
if (t->fs == p->fs) n_fs++; |
0bf2f3aec CRED: Fix SUID ex... |
1326 |
} |
437f7fdb6 check_unsafe_exec... |
1327 |
rcu_read_unlock(); |
0bf2f3aec CRED: Fix SUID ex... |
1328 |
|
9e00cdb09 exec:check_unsafe... |
1329 |
if (p->fs->users > n_fs) |
a6f76f23d CRED: Make execve... |
1330 |
bprm->unsafe |= LSM_UNSAFE_SHARE; |
9e00cdb09 exec:check_unsafe... |
1331 1332 |
else p->fs->in_exec = 1; |
2a4419b5b fs: fs_struct rwl... |
1333 |
spin_unlock(&p->fs->lock); |
a6f76f23d CRED: Make execve... |
1334 |
} |
8b01fc86b fs: take i_mutex ... |
1335 1336 1337 1338 1339 1340 |
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... |
1341 1342 1343 1344 1345 1346 |
/* * 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 ... |
1347 1348 |
bprm->cred->euid = current_euid(); bprm->cred->egid = current_egid(); |
380cf5ba6 fs: Treat foreign... |
1349 |
if (!mnt_may_suid(bprm->file->f_path.mnt)) |
8b01fc86b fs: take i_mutex ... |
1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 |
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_... |
1361 |
inode_lock(inode); |
8b01fc86b fs: take i_mutex ... |
1362 1363 1364 1365 1366 |
/* 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_... |
1367 |
inode_unlock(inode); |
8b01fc86b fs: take i_mutex ... |
1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 |
/* 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... |
1384 1385 |
/* * Fill the binprm structure from the inode. |
1da177e4c Linux-2.6.12-rc2 |
1386 |
* Check permissions, then read the first 128 (BINPRM_BUF_SIZE) bytes |
a6f76f23d CRED: Make execve... |
1387 1388 |
* * This may be called multiple times for binary chains (scripts for example). |
1da177e4c Linux-2.6.12-rc2 |
1389 1390 1391 |
*/ int prepare_binprm(struct linux_binprm *bprm) { |
1da177e4c Linux-2.6.12-rc2 |
1392 |
int retval; |
8b01fc86b fs: take i_mutex ... |
1393 |
bprm_fill_uid(bprm); |
1da177e4c Linux-2.6.12-rc2 |
1394 1395 |
/* fill in binprm security blob */ |
a6f76f23d CRED: Make execve... |
1396 |
retval = security_bprm_set_creds(bprm); |
1da177e4c Linux-2.6.12-rc2 |
1397 1398 |
if (retval) return retval; |
a6f76f23d CRED: Make execve... |
1399 |
bprm->cred_prepared = 1; |
1da177e4c Linux-2.6.12-rc2 |
1400 |
|
a6f76f23d CRED: Make execve... |
1401 1402 |
memset(bprm->buf, 0, BINPRM_BUF_SIZE); return kernel_read(bprm->file, 0, bprm->buf, BINPRM_BUF_SIZE); |
1da177e4c Linux-2.6.12-rc2 |
1403 1404 1405 |
} EXPORT_SYMBOL(prepare_binprm); |
4fc75ff48 exec: fix remove_... |
1406 1407 1408 1409 1410 |
/* * 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... |
1411 |
int remove_arg_zero(struct linux_binprm *bprm) |
1da177e4c Linux-2.6.12-rc2 |
1412 |
{ |
b6a2fea39 mm: variable leng... |
1413 1414 1415 1416 |
int ret = 0; unsigned long offset; char *kaddr; struct page *page; |
4fc75ff48 exec: fix remove_... |
1417 |
|
b6a2fea39 mm: variable leng... |
1418 1419 |
if (!bprm->argc) return 0; |
1da177e4c Linux-2.6.12-rc2 |
1420 |
|
b6a2fea39 mm: variable leng... |
1421 1422 1423 1424 1425 1426 1427 |
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... |
1428 |
kaddr = kmap_atomic(page); |
4fc75ff48 exec: fix remove_... |
1429 |
|
b6a2fea39 mm: variable leng... |
1430 1431 1432 |
for (; offset < PAGE_SIZE && kaddr[offset]; offset++, bprm->p++) ; |
4fc75ff48 exec: fix remove_... |
1433 |
|
e8e3c3d66 fs: remove the se... |
1434 |
kunmap_atomic(kaddr); |
b6a2fea39 mm: variable leng... |
1435 |
put_arg_page(page); |
b6a2fea39 mm: variable leng... |
1436 |
} while (offset == PAGE_SIZE); |
4fc75ff48 exec: fix remove_... |
1437 |
|
b6a2fea39 mm: variable leng... |
1438 1439 1440 |
bprm->p++; bprm->argc--; ret = 0; |
4fc75ff48 exec: fix remove_... |
1441 |
|
b6a2fea39 mm: variable leng... |
1442 1443 |
out: return ret; |
1da177e4c Linux-2.6.12-rc2 |
1444 |
} |
1da177e4c Linux-2.6.12-rc2 |
1445 |
EXPORT_SYMBOL(remove_arg_zero); |
cb7b6b1cb exec: cleanup the... |
1446 1447 |
#define printable(c) (((c)=='\t') || ((c)==' ') || (0x20<=(c) && (c)<=0x7e)) |
1da177e4c Linux-2.6.12-rc2 |
1448 1449 1450 |
/* * cycle the list of binary formats handler, until one recognizes the image */ |
3c456bfc4 get rid of pt_reg... |
1451 |
int search_binary_handler(struct linux_binprm *bprm) |
1da177e4c Linux-2.6.12-rc2 |
1452 |
{ |
cb7b6b1cb exec: cleanup the... |
1453 |
bool need_retry = IS_ENABLED(CONFIG_MODULES); |
1da177e4c Linux-2.6.12-rc2 |
1454 |
struct linux_binfmt *fmt; |
cb7b6b1cb exec: cleanup the... |
1455 |
int retval; |
1da177e4c Linux-2.6.12-rc2 |
1456 |
|
d74026986 exec: use -ELOOP ... |
1457 |
/* This allows 4 levels of binfmt rewrites before failing hard. */ |
131b2f9f1 exec: kill "int d... |
1458 |
if (bprm->recursion_depth > 5) |
d74026986 exec: use -ELOOP ... |
1459 |
return -ELOOP; |
1da177e4c Linux-2.6.12-rc2 |
1460 1461 1462 |
retval = security_bprm_check(bprm); if (retval) return retval; |
1da177e4c Linux-2.6.12-rc2 |
1463 |
retval = -ENOENT; |
cb7b6b1cb exec: cleanup the... |
1464 1465 1466 1467 1468 1469 1470 1471 |
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... |
1472 1473 |
read_lock(&binfmt_lock); put_binfmt(fmt); |
cb7b6b1cb exec: cleanup the... |
1474 |
bprm->recursion_depth--; |
19d860a14 handle suicide on... |
1475 1476 1477 1478 1479 1480 1481 1482 |
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... |
1483 |
return retval; |
1da177e4c Linux-2.6.12-rc2 |
1484 |
} |
1da177e4c Linux-2.6.12-rc2 |
1485 |
} |
cb7b6b1cb exec: cleanup the... |
1486 |
read_unlock(&binfmt_lock); |
19d860a14 handle suicide on... |
1487 |
if (need_retry) { |
cb7b6b1cb exec: cleanup the... |
1488 1489 1490 |
if (printable(bprm->buf[0]) && printable(bprm->buf[1]) && printable(bprm->buf[2]) && printable(bprm->buf[3])) return retval; |
4e0621a07 exec: don't retry... |
1491 1492 |
if (request_module("binfmt-%04x", *(ushort *)(bprm->buf + 2)) < 0) return retval; |
cb7b6b1cb exec: cleanup the... |
1493 1494 1495 |
need_retry = false; goto retry; } |
1da177e4c Linux-2.6.12-rc2 |
1496 1497 |
return retval; } |
1da177e4c Linux-2.6.12-rc2 |
1498 |
EXPORT_SYMBOL(search_binary_handler); |
5d1baf3b6 exec: introduce e... |
1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 |
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... |
1512 |
audit_bprm(bprm); |
5d1baf3b6 exec: introduce e... |
1513 1514 |
trace_sched_process_exec(current, old_pid, bprm); ptrace_event(PTRACE_EVENT_EXEC, old_vpid); |
9beb266f2 exec: proc_exec_c... |
1515 |
proc_exec_connector(current); |
5d1baf3b6 exec: introduce e... |
1516 1517 1518 1519 |
} return ret; } |
1da177e4c Linux-2.6.12-rc2 |
1520 1521 1522 |
/* * sys_execve() executes a new program. */ |
51f39a1f0 syscalls: impleme... |
1523 1524 1525 1526 |
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 |
1527 |
{ |
51f39a1f0 syscalls: impleme... |
1528 |
char *pathbuf = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1529 1530 |
struct linux_binprm *bprm; struct file *file; |
3b1253880 [PATCH] sanitize ... |
1531 |
struct files_struct *displaced; |
1da177e4c Linux-2.6.12-rc2 |
1532 |
int retval; |
72fa59970 move RLIMIT_NPROC... |
1533 |
|
c4ad8f98b execve: use 'stru... |
1534 1535 |
if (IS_ERR(filename)) return PTR_ERR(filename); |
72fa59970 move RLIMIT_NPROC... |
1536 1537 1538 1539 1540 1541 1542 |
/* * 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... |
1543 |
atomic_read(¤t_user()->processes) > rlimit(RLIMIT_NPROC)) { |
72fa59970 move RLIMIT_NPROC... |
1544 1545 1546 1547 1548 1549 1550 |
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 |
1551 |
|
3b1253880 [PATCH] sanitize ... |
1552 |
retval = unshare_files(&displaced); |
fd8328be8 [PATCH] sanitize ... |
1553 1554 |
if (retval) goto out_ret; |
1da177e4c Linux-2.6.12-rc2 |
1555 |
retval = -ENOMEM; |
11b0b5abb [PATCH] use kzall... |
1556 |
bprm = kzalloc(sizeof(*bprm), GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
1557 |
if (!bprm) |
fd8328be8 [PATCH] sanitize ... |
1558 |
goto out_files; |
1da177e4c Linux-2.6.12-rc2 |
1559 |
|
a2a8474c3 exec: do not slee... |
1560 1561 |
retval = prepare_bprm_creds(bprm); if (retval) |
a6f76f23d CRED: Make execve... |
1562 |
goto out_free; |
498052bba New locking/refco... |
1563 |
|
9e00cdb09 exec:check_unsafe... |
1564 |
check_unsafe_exec(bprm); |
a2a8474c3 exec: do not slee... |
1565 |
current->in_execve = 1; |
a6f76f23d CRED: Make execve... |
1566 |
|
51f39a1f0 syscalls: impleme... |
1567 |
file = do_open_execat(fd, filename, flags); |
1da177e4c Linux-2.6.12-rc2 |
1568 1569 |
retval = PTR_ERR(file); if (IS_ERR(file)) |
498052bba New locking/refco... |
1570 |
goto out_unmark; |
1da177e4c Linux-2.6.12-rc2 |
1571 1572 |
sched_exec(); |
1da177e4c Linux-2.6.12-rc2 |
1573 |
bprm->file = file; |
51f39a1f0 syscalls: impleme... |
1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 |
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 |
1596 |
|
b6a2fea39 mm: variable leng... |
1597 1598 |
retval = bprm_mm_init(bprm); if (retval) |
63e46b95e exec: move the fi... |
1599 |
goto out_unmark; |
1da177e4c Linux-2.6.12-rc2 |
1600 |
|
b6a2fea39 mm: variable leng... |
1601 |
bprm->argc = count(argv, MAX_ARG_STRINGS); |
1da177e4c Linux-2.6.12-rc2 |
1602 |
if ((retval = bprm->argc) < 0) |
a6f76f23d CRED: Make execve... |
1603 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
1604 |
|
b6a2fea39 mm: variable leng... |
1605 |
bprm->envc = count(envp, MAX_ARG_STRINGS); |
1da177e4c Linux-2.6.12-rc2 |
1606 |
if ((retval = bprm->envc) < 0) |
1da177e4c Linux-2.6.12-rc2 |
1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 |
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; |
5d1baf3b6 exec: introduce e... |
1625 |
retval = exec_binprm(bprm); |
a6f76f23d CRED: Make execve... |
1626 1627 |
if (retval < 0) goto out; |
1da177e4c Linux-2.6.12-rc2 |
1628 |
|
a6f76f23d CRED: Make execve... |
1629 |
/* execve succeeded */ |
498052bba New locking/refco... |
1630 |
current->fs->in_exec = 0; |
f9ce1f1cd Add in_execve fla... |
1631 |
current->in_execve = 0; |
a6f76f23d CRED: Make execve... |
1632 |
acct_update_integrals(current); |
82727018b sched/numa: Call ... |
1633 |
task_numa_free(current); |
a6f76f23d CRED: Make execve... |
1634 |
free_bprm(bprm); |
51f39a1f0 syscalls: impleme... |
1635 |
kfree(pathbuf); |
c4ad8f98b execve: use 'stru... |
1636 |
putname(filename); |
a6f76f23d CRED: Make execve... |
1637 1638 1639 |
if (displaced) put_files_struct(displaced); return retval; |
1da177e4c Linux-2.6.12-rc2 |
1640 |
|
a6f76f23d CRED: Make execve... |
1641 |
out: |
3c77f8457 exec: make argv/e... |
1642 1643 1644 1645 |
if (bprm->mm) { acct_arg_size(bprm, 0); mmput(bprm->mm); } |
1da177e4c Linux-2.6.12-rc2 |
1646 |
|
498052bba New locking/refco... |
1647 |
out_unmark: |
9e00cdb09 exec:check_unsafe... |
1648 |
current->fs->in_exec = 0; |
f9ce1f1cd Add in_execve fla... |
1649 |
current->in_execve = 0; |
a6f76f23d CRED: Make execve... |
1650 1651 |
out_free: |
08a6fac1c [PATCH] get rid o... |
1652 |
free_bprm(bprm); |
51f39a1f0 syscalls: impleme... |
1653 |
kfree(pathbuf); |
1da177e4c Linux-2.6.12-rc2 |
1654 |
|
fd8328be8 [PATCH] sanitize ... |
1655 |
out_files: |
3b1253880 [PATCH] sanitize ... |
1656 1657 |
if (displaced) reset_files_struct(displaced); |
1da177e4c Linux-2.6.12-rc2 |
1658 |
out_ret: |
c4ad8f98b execve: use 'stru... |
1659 |
putname(filename); |
1da177e4c Linux-2.6.12-rc2 |
1660 1661 |
return retval; } |
c4ad8f98b execve: use 'stru... |
1662 |
int do_execve(struct filename *filename, |
ba2d01629 exec: introduce s... |
1663 |
const char __user *const __user *__argv, |
da3d4c5fa get rid of pt_reg... |
1664 |
const char __user *const __user *__envp) |
ba2d01629 exec: introduce s... |
1665 |
{ |
0e028465d exec: unify do_ex... |
1666 1667 |
struct user_arg_ptr argv = { .ptr.native = __argv }; struct user_arg_ptr envp = { .ptr.native = __envp }; |
51f39a1f0 syscalls: impleme... |
1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 |
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... |
1680 1681 1682 |
} #ifdef CONFIG_COMPAT |
c4ad8f98b execve: use 'stru... |
1683 |
static int compat_do_execve(struct filename *filename, |
38b983b34 generic sys_execve() |
1684 |
const compat_uptr_t __user *__argv, |
d03d26e58 make compat_do_ex... |
1685 |
const compat_uptr_t __user *__envp) |
0e028465d exec: unify do_ex... |
1686 1687 1688 1689 1690 1691 1692 1693 1694 |
{ 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... |
1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 |
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... |
1712 |
} |
0e028465d exec: unify do_ex... |
1713 |
#endif |
ba2d01629 exec: introduce s... |
1714 |
|
964ee7df9 exec: fix set_bin... |
1715 |
void set_binfmt(struct linux_binfmt *new) |
1da177e4c Linux-2.6.12-rc2 |
1716 |
{ |
801460d0c task_struct clean... |
1717 1718 1719 1720 |
struct mm_struct *mm = current->mm; if (mm->binfmt) module_put(mm->binfmt->module); |
1da177e4c Linux-2.6.12-rc2 |
1721 |
|
801460d0c task_struct clean... |
1722 |
mm->binfmt = new; |
964ee7df9 exec: fix set_bin... |
1723 1724 |
if (new) __module_get(new->module); |
1da177e4c Linux-2.6.12-rc2 |
1725 |
} |
1da177e4c Linux-2.6.12-rc2 |
1726 |
EXPORT_SYMBOL(set_binfmt); |
6c5d52382 coredump masking:... |
1727 |
/* |
7288e1187 coredump: kill MM... |
1728 |
* set_dumpable stores three-value SUID_DUMP_* into mm->flags. |
6c5d52382 coredump masking:... |
1729 1730 1731 |
*/ void set_dumpable(struct mm_struct *mm, int value) { |
abacd2fe3 coredump: set_dum... |
1732 |
unsigned long old, new; |
7288e1187 coredump: kill MM... |
1733 1734 |
if (WARN_ON((unsigned)value > SUID_DUMP_ROOT)) return; |
abacd2fe3 coredump: set_dum... |
1735 1736 |
do { old = ACCESS_ONCE(mm->flags); |
7288e1187 coredump: kill MM... |
1737 |
new = (old & ~MMF_DUMPABLE_MASK) | value; |
abacd2fe3 coredump: set_dum... |
1738 |
} while (cmpxchg(&mm->flags, old, new) != old); |
6c5d52382 coredump masking:... |
1739 |
} |
6c5d52382 coredump masking:... |
1740 |
|
38b983b34 generic sys_execve() |
1741 1742 1743 1744 1745 |
SYSCALL_DEFINE3(execve, const char __user *, filename, const char __user *const __user *, argv, const char __user *const __user *, envp) { |
c4ad8f98b execve: use 'stru... |
1746 |
return do_execve(getname(filename), argv, envp); |
38b983b34 generic sys_execve() |
1747 |
} |
51f39a1f0 syscalls: impleme... |
1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 |
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() |
1761 |
#ifdef CONFIG_COMPAT |
625b1d7e8 fs/compat: conver... |
1762 1763 1764 |
COMPAT_SYSCALL_DEFINE3(execve, const char __user *, filename, const compat_uptr_t __user *, argv, const compat_uptr_t __user *, envp) |
38b983b34 generic sys_execve() |
1765 |
{ |
c4ad8f98b execve: use 'stru... |
1766 |
return compat_do_execve(getname(filename), argv, envp); |
38b983b34 generic sys_execve() |
1767 |
} |
51f39a1f0 syscalls: impleme... |
1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 |
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() |
1781 |
#endif |