mirror of
https://github.com/AetherDroid/android_kernel_samsung_on5xelte.git
synced 2025-09-08 01:08:03 -04:00
Fixed MTP to work with TWRP
This commit is contained in:
awab228
commit
f6dfaef42e
50820 changed files with 20846062 additions and 0 deletions
751
fs/coredump.c
Normal file
751
fs/coredump.c
Normal file
|
|
@ -0,0 +1,751 @@
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#include <linux/slab.h>
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#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/stat.h>
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#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>
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#include <linux/spinlock.h>
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#include <linux/key.h>
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#include <linux/personality.h>
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#include <linux/binfmts.h>
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#include <linux/coredump.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>
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#include <linux/namei.h>
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#include <linux/mount.h>
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#include <linux/security.h>
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#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 <asm/uaccess.h>
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#include <asm/mmu_context.h>
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#include <asm/tlb.h>
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#include <asm/exec.h>
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#include <trace/events/task.h>
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#include "internal.h"
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#include <trace/events/sched.h>
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int core_uses_pid;
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unsigned int core_pipe_limit;
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char core_pattern[CORENAME_MAX_SIZE] = "core";
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static int core_name_size = CORENAME_MAX_SIZE;
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struct core_name {
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char *corename;
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int used, size;
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};
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/* The maximal length of core_pattern is also specified in sysctl.c */
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static int expand_corename(struct core_name *cn, int size)
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{
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char *corename = krealloc(cn->corename, size, GFP_KERNEL);
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if (!corename)
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return -ENOMEM;
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if (size > core_name_size) /* racy but harmless */
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core_name_size = size;
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cn->size = ksize(corename);
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cn->corename = corename;
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return 0;
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}
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static int cn_vprintf(struct core_name *cn, const char *fmt, va_list arg)
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{
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int free, need;
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va_list arg_copy;
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again:
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free = cn->size - cn->used;
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va_copy(arg_copy, arg);
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need = vsnprintf(cn->corename + cn->used, free, fmt, arg_copy);
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va_end(arg_copy);
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if (need < free) {
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cn->used += need;
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return 0;
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}
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if (!expand_corename(cn, cn->size + need - free + 1))
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goto again;
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return -ENOMEM;
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}
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static int cn_printf(struct core_name *cn, const char *fmt, ...)
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{
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va_list arg;
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int ret;
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va_start(arg, fmt);
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ret = cn_vprintf(cn, fmt, arg);
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va_end(arg);
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return ret;
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}
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static int cn_esc_printf(struct core_name *cn, const char *fmt, ...)
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{
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int cur = cn->used;
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va_list arg;
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int ret;
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va_start(arg, fmt);
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ret = cn_vprintf(cn, fmt, arg);
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va_end(arg);
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for (; cur < cn->used; ++cur) {
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if (cn->corename[cur] == '/')
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cn->corename[cur] = '!';
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}
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return ret;
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}
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static int cn_print_exe_file(struct core_name *cn)
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{
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struct file *exe_file;
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char *pathbuf, *path;
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int ret;
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exe_file = get_mm_exe_file(current->mm);
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if (!exe_file)
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return cn_esc_printf(cn, "%s (path unknown)", current->comm);
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pathbuf = kmalloc(PATH_MAX, GFP_TEMPORARY);
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if (!pathbuf) {
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ret = -ENOMEM;
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goto put_exe_file;
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}
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path = d_path(&exe_file->f_path, pathbuf, PATH_MAX);
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if (IS_ERR(path)) {
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ret = PTR_ERR(path);
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goto free_buf;
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}
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ret = cn_esc_printf(cn, "%s", path);
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free_buf:
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kfree(pathbuf);
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put_exe_file:
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fput(exe_file);
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return ret;
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}
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/* format_corename will inspect the pattern parameter, and output a
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* name into corename, which must have space for at least
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* CORENAME_MAX_SIZE bytes plus one byte for the zero terminator.
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*/
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static int format_corename(struct core_name *cn, struct coredump_params *cprm)
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{
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const struct cred *cred = current_cred();
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const char *pat_ptr = core_pattern;
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int ispipe = (*pat_ptr == '|');
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int pid_in_pattern = 0;
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int err = 0;
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cn->used = 0;
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cn->corename = NULL;
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if (expand_corename(cn, core_name_size))
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return -ENOMEM;
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cn->corename[0] = '\0';
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if (ispipe)
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++pat_ptr;
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/* Repeat as long as we have more pattern to process and more output
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space */
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while (*pat_ptr) {
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if (*pat_ptr != '%') {
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err = cn_printf(cn, "%c", *pat_ptr++);
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} else {
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switch (*++pat_ptr) {
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/* single % at the end, drop that */
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case 0:
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goto out;
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/* Double percent, output one percent */
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case '%':
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err = cn_printf(cn, "%c", '%');
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break;
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/* pid */
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case 'p':
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pid_in_pattern = 1;
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err = cn_printf(cn, "%d",
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task_tgid_vnr(current));
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break;
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/* global pid */
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case 'P':
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err = cn_printf(cn, "%d",
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task_tgid_nr(current));
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break;
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case 'i':
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err = cn_printf(cn, "%d",
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task_pid_vnr(current));
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break;
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case 'I':
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err = cn_printf(cn, "%d",
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task_pid_nr(current));
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break;
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/* uid */
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case 'u':
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err = cn_printf(cn, "%d", cred->uid);
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break;
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/* gid */
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case 'g':
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err = cn_printf(cn, "%d", cred->gid);
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break;
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case 'd':
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err = cn_printf(cn, "%d",
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__get_dumpable(cprm->mm_flags));
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break;
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/* signal that caused the coredump */
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case 's':
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err = cn_printf(cn, "%ld", cprm->siginfo->si_signo);
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break;
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/* UNIX time of coredump */
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case 't': {
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struct timeval tv;
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do_gettimeofday(&tv);
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err = cn_printf(cn, "%lu", tv.tv_sec);
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break;
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}
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/* hostname */
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case 'h':
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down_read(&uts_sem);
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err = cn_esc_printf(cn, "%s",
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utsname()->nodename);
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up_read(&uts_sem);
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break;
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/* executable */
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case 'e':
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err = cn_esc_printf(cn, "%s", current->comm);
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break;
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case 'E':
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err = cn_print_exe_file(cn);
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break;
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/* core limit size */
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case 'c':
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err = cn_printf(cn, "%lu",
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rlimit(RLIMIT_CORE));
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break;
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default:
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break;
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}
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++pat_ptr;
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}
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if (err)
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return err;
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}
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out:
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/* Backward compatibility with core_uses_pid:
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*
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* If core_pattern does not include a %p (as is the default)
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* and core_uses_pid is set, then .%pid will be appended to
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* the filename. Do not do this for piped commands. */
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if (!ispipe && !pid_in_pattern && core_uses_pid) {
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err = cn_printf(cn, ".%d", task_tgid_vnr(current));
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if (err)
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return err;
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}
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return ispipe;
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}
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static int zap_process(struct task_struct *start, int exit_code)
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{
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struct task_struct *t;
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int nr = 0;
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start->signal->group_exit_code = exit_code;
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start->signal->group_stop_count = 0;
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t = start;
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do {
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task_clear_jobctl_pending(t, JOBCTL_PENDING_MASK);
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if (t != current && t->mm) {
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sigaddset(&t->pending.signal, SIGKILL);
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signal_wake_up(t, 1);
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nr++;
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}
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} while_each_thread(start, t);
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return nr;
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}
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static int zap_threads(struct task_struct *tsk, struct mm_struct *mm,
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struct core_state *core_state, int exit_code)
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{
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struct task_struct *g, *p;
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unsigned long flags;
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int nr = -EAGAIN;
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spin_lock_irq(&tsk->sighand->siglock);
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if (!signal_group_exit(tsk->signal)) {
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mm->core_state = core_state;
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nr = zap_process(tsk, exit_code);
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tsk->signal->group_exit_task = tsk;
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/* ignore all signals except SIGKILL, see prepare_signal() */
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tsk->signal->flags = SIGNAL_GROUP_COREDUMP;
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clear_tsk_thread_flag(tsk, TIF_SIGPENDING);
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}
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spin_unlock_irq(&tsk->sighand->siglock);
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if (unlikely(nr < 0))
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return nr;
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tsk->flags |= PF_DUMPCORE;
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if (atomic_read(&mm->mm_users) == nr + 1)
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goto done;
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||||
/*
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||||
* We should find and kill all tasks which use this mm, and we should
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* count them correctly into ->nr_threads. We don't take tasklist
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* lock, but this is safe wrt:
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||||
*
|
||||
* fork:
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||||
* None of sub-threads can fork after zap_process(leader). All
|
||||
* processes which were created before this point should be
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||||
* visible to zap_threads() because copy_process() adds the new
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* process to the tail of init_task.tasks list, and lock/unlock
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* of ->siglock provides a memory barrier.
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||||
*
|
||||
* do_exit:
|
||||
* The caller holds mm->mmap_sem. This means that the task which
|
||||
* uses this mm can't pass exit_mm(), so it can't exit or clear
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||||
* its ->mm.
|
||||
*
|
||||
* de_thread:
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||||
* It does list_replace_rcu(&leader->tasks, ¤t->tasks),
|
||||
* we must see either old or new leader, this does not matter.
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||||
* However, it can change p->sighand, so lock_task_sighand(p)
|
||||
* must be used. Since p->mm != NULL and we hold ->mmap_sem
|
||||
* it can't fail.
|
||||
*
|
||||
* Note also that "g" can be the old leader with ->mm == NULL
|
||||
* and already unhashed and thus removed from ->thread_group.
|
||||
* This is OK, __unhash_process()->list_del_rcu() does not
|
||||
* clear the ->next pointer, we will find the new leader via
|
||||
* next_thread().
|
||||
*/
|
||||
rcu_read_lock();
|
||||
for_each_process(g) {
|
||||
if (g == tsk->group_leader)
|
||||
continue;
|
||||
if (g->flags & PF_KTHREAD)
|
||||
continue;
|
||||
p = g;
|
||||
do {
|
||||
if (p->mm) {
|
||||
if (unlikely(p->mm == mm)) {
|
||||
lock_task_sighand(p, &flags);
|
||||
nr += zap_process(p, exit_code);
|
||||
p->signal->flags = SIGNAL_GROUP_EXIT;
|
||||
unlock_task_sighand(p, &flags);
|
||||
}
|
||||
break;
|
||||
}
|
||||
} while_each_thread(g, p);
|
||||
}
|
||||
rcu_read_unlock();
|
||||
done:
|
||||
atomic_set(&core_state->nr_threads, nr);
|
||||
return nr;
|
||||
}
|
||||
|
||||
static int coredump_wait(int exit_code, struct core_state *core_state)
|
||||
{
|
||||
struct task_struct *tsk = current;
|
||||
struct mm_struct *mm = tsk->mm;
|
||||
int core_waiters = -EBUSY;
|
||||
|
||||
init_completion(&core_state->startup);
|
||||
core_state->dumper.task = tsk;
|
||||
core_state->dumper.next = NULL;
|
||||
|
||||
down_write(&mm->mmap_sem);
|
||||
if (!mm->core_state)
|
||||
core_waiters = zap_threads(tsk, mm, core_state, exit_code);
|
||||
up_write(&mm->mmap_sem);
|
||||
|
||||
if (core_waiters > 0) {
|
||||
struct core_thread *ptr;
|
||||
|
||||
wait_for_completion(&core_state->startup);
|
||||
/*
|
||||
* Wait for all the threads to become inactive, so that
|
||||
* all the thread context (extended register state, like
|
||||
* fpu etc) gets copied to the memory.
|
||||
*/
|
||||
ptr = core_state->dumper.next;
|
||||
while (ptr != NULL) {
|
||||
wait_task_inactive(ptr->task, 0);
|
||||
ptr = ptr->next;
|
||||
}
|
||||
}
|
||||
|
||||
return core_waiters;
|
||||
}
|
||||
|
||||
static void coredump_finish(struct mm_struct *mm, bool core_dumped)
|
||||
{
|
||||
struct core_thread *curr, *next;
|
||||
struct task_struct *task;
|
||||
|
||||
spin_lock_irq(¤t->sighand->siglock);
|
||||
if (core_dumped && !__fatal_signal_pending(current))
|
||||
current->signal->group_exit_code |= 0x80;
|
||||
current->signal->group_exit_task = NULL;
|
||||
current->signal->flags = SIGNAL_GROUP_EXIT;
|
||||
spin_unlock_irq(¤t->sighand->siglock);
|
||||
|
||||
next = mm->core_state->dumper.next;
|
||||
while ((curr = next) != NULL) {
|
||||
next = curr->next;
|
||||
task = curr->task;
|
||||
/*
|
||||
* see exit_mm(), curr->task must not see
|
||||
* ->task == NULL before we read ->next.
|
||||
*/
|
||||
smp_mb();
|
||||
curr->task = NULL;
|
||||
wake_up_process(task);
|
||||
}
|
||||
|
||||
mm->core_state = NULL;
|
||||
}
|
||||
|
||||
static bool dump_interrupted(void)
|
||||
{
|
||||
/*
|
||||
* SIGKILL or freezing() interrupt the coredumping. Perhaps we
|
||||
* can do try_to_freeze() and check __fatal_signal_pending(),
|
||||
* but then we need to teach dump_write() to restart and clear
|
||||
* TIF_SIGPENDING.
|
||||
*/
|
||||
return signal_pending(current);
|
||||
}
|
||||
|
||||
static void wait_for_dump_helpers(struct file *file)
|
||||
{
|
||||
struct pipe_inode_info *pipe = file->private_data;
|
||||
|
||||
pipe_lock(pipe);
|
||||
pipe->readers++;
|
||||
pipe->writers--;
|
||||
wake_up_interruptible_sync(&pipe->wait);
|
||||
kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);
|
||||
pipe_unlock(pipe);
|
||||
|
||||
/*
|
||||
* We actually want wait_event_freezable() but then we need
|
||||
* to clear TIF_SIGPENDING and improve dump_interrupted().
|
||||
*/
|
||||
wait_event_interruptible(pipe->wait, pipe->readers == 1);
|
||||
|
||||
pipe_lock(pipe);
|
||||
pipe->readers--;
|
||||
pipe->writers++;
|
||||
pipe_unlock(pipe);
|
||||
}
|
||||
|
||||
/*
|
||||
* umh_pipe_setup
|
||||
* helper function to customize the process used
|
||||
* to collect the core in userspace. Specifically
|
||||
* it sets up a pipe and installs it as fd 0 (stdin)
|
||||
* for the process. Returns 0 on success, or
|
||||
* PTR_ERR on failure.
|
||||
* Note that it also sets the core limit to 1. This
|
||||
* is a special value that we use to trap recursive
|
||||
* core dumps
|
||||
*/
|
||||
static int umh_pipe_setup(struct subprocess_info *info, struct cred *new)
|
||||
{
|
||||
struct file *files[2];
|
||||
struct coredump_params *cp = (struct coredump_params *)info->data;
|
||||
int err = create_pipe_files(files, 0);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
cp->file = files[1];
|
||||
|
||||
err = replace_fd(0, files[0], 0);
|
||||
fput(files[0]);
|
||||
/* and disallow core files too */
|
||||
current->signal->rlim[RLIMIT_CORE] = (struct rlimit){1, 1};
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
void do_coredump(const siginfo_t *siginfo)
|
||||
{
|
||||
struct core_state core_state;
|
||||
struct core_name cn;
|
||||
struct mm_struct *mm = current->mm;
|
||||
struct linux_binfmt * binfmt;
|
||||
const struct cred *old_cred;
|
||||
struct cred *cred;
|
||||
int retval = 0;
|
||||
int flag = 0;
|
||||
int ispipe;
|
||||
struct files_struct *displaced;
|
||||
bool need_nonrelative = false;
|
||||
bool core_dumped = false;
|
||||
static atomic_t core_dump_count = ATOMIC_INIT(0);
|
||||
struct coredump_params cprm = {
|
||||
.siginfo = siginfo,
|
||||
.regs = signal_pt_regs(),
|
||||
.limit = rlimit(RLIMIT_CORE),
|
||||
/*
|
||||
* We must use the same mm->flags while dumping core to avoid
|
||||
* inconsistency of bit flags, since this flag is not protected
|
||||
* by any locks.
|
||||
*/
|
||||
.mm_flags = mm->flags,
|
||||
};
|
||||
|
||||
audit_core_dumps(siginfo->si_signo);
|
||||
|
||||
binfmt = mm->binfmt;
|
||||
if (!binfmt || !binfmt->core_dump)
|
||||
goto fail;
|
||||
if (!__get_dumpable(cprm.mm_flags))
|
||||
goto fail;
|
||||
|
||||
cred = prepare_creds();
|
||||
if (!cred)
|
||||
goto fail;
|
||||
/*
|
||||
* We cannot trust fsuid as being the "true" uid of the process
|
||||
* nor do we know its entire history. We only know it was tainted
|
||||
* so we dump it as root in mode 2, and only into a controlled
|
||||
* environment (pipe handler or fully qualified path).
|
||||
*/
|
||||
if (__get_dumpable(cprm.mm_flags) == SUID_DUMP_ROOT) {
|
||||
/* Setuid core dump mode */
|
||||
flag = O_EXCL; /* Stop rewrite attacks */
|
||||
cred->fsuid = GLOBAL_ROOT_UID; /* Dump root private */
|
||||
need_nonrelative = true;
|
||||
}
|
||||
|
||||
retval = coredump_wait(siginfo->si_signo, &core_state);
|
||||
if (retval < 0)
|
||||
goto fail_creds;
|
||||
|
||||
old_cred = override_creds(cred);
|
||||
|
||||
ispipe = format_corename(&cn, &cprm);
|
||||
|
||||
if (ispipe) {
|
||||
int dump_count;
|
||||
char **helper_argv;
|
||||
struct subprocess_info *sub_info;
|
||||
|
||||
if (ispipe < 0) {
|
||||
printk(KERN_WARNING "format_corename failed\n");
|
||||
printk(KERN_WARNING "Aborting core\n");
|
||||
goto fail_unlock;
|
||||
}
|
||||
|
||||
if (cprm.limit == 1) {
|
||||
/* See umh_pipe_setup() which sets RLIMIT_CORE = 1.
|
||||
*
|
||||
* Normally core limits are irrelevant to pipes, since
|
||||
* we're not writing to the file system, but we use
|
||||
* cprm.limit of 1 here as a speacial value, this is a
|
||||
* consistent way to catch recursive crashes.
|
||||
* We can still crash if the core_pattern binary sets
|
||||
* RLIM_CORE = !1, but it runs as root, and can do
|
||||
* lots of stupid things.
|
||||
*
|
||||
* Note that we use task_tgid_vnr here to grab the pid
|
||||
* of the process group leader. That way we get the
|
||||
* right pid if a thread in a multi-threaded
|
||||
* core_pattern process dies.
|
||||
*/
|
||||
printk(KERN_WARNING
|
||||
"Process %d(%s) has RLIMIT_CORE set to 1\n",
|
||||
task_tgid_vnr(current), current->comm);
|
||||
printk(KERN_WARNING "Aborting core\n");
|
||||
goto fail_unlock;
|
||||
}
|
||||
cprm.limit = RLIM_INFINITY;
|
||||
|
||||
dump_count = atomic_inc_return(&core_dump_count);
|
||||
if (core_pipe_limit && (core_pipe_limit < dump_count)) {
|
||||
printk(KERN_WARNING "Pid %d(%s) over core_pipe_limit\n",
|
||||
task_tgid_vnr(current), current->comm);
|
||||
printk(KERN_WARNING "Skipping core dump\n");
|
||||
goto fail_dropcount;
|
||||
}
|
||||
|
||||
helper_argv = argv_split(GFP_KERNEL, cn.corename, NULL);
|
||||
if (!helper_argv) {
|
||||
printk(KERN_WARNING "%s failed to allocate memory\n",
|
||||
__func__);
|
||||
goto fail_dropcount;
|
||||
}
|
||||
|
||||
retval = -ENOMEM;
|
||||
sub_info = call_usermodehelper_setup(helper_argv[0],
|
||||
helper_argv, NULL, GFP_KERNEL,
|
||||
umh_pipe_setup, NULL, &cprm);
|
||||
if (sub_info)
|
||||
retval = call_usermodehelper_exec(sub_info,
|
||||
UMH_WAIT_EXEC);
|
||||
|
||||
argv_free(helper_argv);
|
||||
if (retval) {
|
||||
printk(KERN_INFO "Core dump to |%s pipe failed\n",
|
||||
cn.corename);
|
||||
goto close_fail;
|
||||
}
|
||||
} else {
|
||||
struct inode *inode;
|
||||
|
||||
if (cprm.limit < binfmt->min_coredump)
|
||||
goto fail_unlock;
|
||||
|
||||
if (need_nonrelative && cn.corename[0] != '/') {
|
||||
printk(KERN_WARNING "Pid %d(%s) can only dump core "\
|
||||
"to fully qualified path!\n",
|
||||
task_tgid_vnr(current), current->comm);
|
||||
printk(KERN_WARNING "Skipping core dump\n");
|
||||
goto fail_unlock;
|
||||
}
|
||||
|
||||
cprm.file = filp_open(cn.corename,
|
||||
O_CREAT | 2 | O_NOFOLLOW | O_LARGEFILE | flag,
|
||||
0600);
|
||||
if (IS_ERR(cprm.file))
|
||||
goto fail_unlock;
|
||||
|
||||
inode = file_inode(cprm.file);
|
||||
if (inode->i_nlink > 1)
|
||||
goto close_fail;
|
||||
if (d_unhashed(cprm.file->f_path.dentry))
|
||||
goto close_fail;
|
||||
/*
|
||||
* AK: actually i see no reason to not allow this for named
|
||||
* pipes etc, but keep the previous behaviour for now.
|
||||
*/
|
||||
if (!S_ISREG(inode->i_mode))
|
||||
goto close_fail;
|
||||
/*
|
||||
* Dont allow local users get cute and trick others to coredump
|
||||
* into their pre-created files.
|
||||
*/
|
||||
if (!uid_eq(inode->i_uid, current_fsuid()))
|
||||
goto close_fail;
|
||||
if (!cprm.file->f_op->write)
|
||||
goto close_fail;
|
||||
if (do_truncate(cprm.file->f_path.dentry, 0, 0, cprm.file))
|
||||
goto close_fail;
|
||||
}
|
||||
|
||||
/* get us an unshared descriptor table; almost always a no-op */
|
||||
retval = unshare_files(&displaced);
|
||||
if (retval)
|
||||
goto close_fail;
|
||||
if (displaced)
|
||||
put_files_struct(displaced);
|
||||
if (!dump_interrupted()) {
|
||||
file_start_write(cprm.file);
|
||||
core_dumped = binfmt->core_dump(&cprm);
|
||||
file_end_write(cprm.file);
|
||||
}
|
||||
if (ispipe && core_pipe_limit)
|
||||
wait_for_dump_helpers(cprm.file);
|
||||
close_fail:
|
||||
if (cprm.file)
|
||||
filp_close(cprm.file, NULL);
|
||||
fail_dropcount:
|
||||
if (ispipe)
|
||||
atomic_dec(&core_dump_count);
|
||||
fail_unlock:
|
||||
kfree(cn.corename);
|
||||
coredump_finish(mm, core_dumped);
|
||||
revert_creds(old_cred);
|
||||
fail_creds:
|
||||
put_cred(cred);
|
||||
fail:
|
||||
return;
|
||||
}
|
||||
|
||||
/*
|
||||
* Core dumping helper functions. These are the only things you should
|
||||
* do on a core-file: use only these functions to write out all the
|
||||
* necessary info.
|
||||
*/
|
||||
int dump_emit(struct coredump_params *cprm, const void *addr, int nr)
|
||||
{
|
||||
struct file *file = cprm->file;
|
||||
loff_t pos = file->f_pos;
|
||||
ssize_t n;
|
||||
if (cprm->written + nr > cprm->limit)
|
||||
return 0;
|
||||
while (nr) {
|
||||
if (dump_interrupted())
|
||||
return 0;
|
||||
n = __kernel_write(file, addr, nr, &pos);
|
||||
if (n <= 0)
|
||||
return 0;
|
||||
file->f_pos = pos;
|
||||
cprm->written += n;
|
||||
nr -= n;
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
EXPORT_SYMBOL(dump_emit);
|
||||
|
||||
int dump_skip(struct coredump_params *cprm, size_t nr)
|
||||
{
|
||||
static char zeroes[PAGE_SIZE];
|
||||
struct file *file = cprm->file;
|
||||
if (file->f_op->llseek && file->f_op->llseek != no_llseek) {
|
||||
if (cprm->written + nr > cprm->limit)
|
||||
return 0;
|
||||
if (dump_interrupted() ||
|
||||
file->f_op->llseek(file, nr, SEEK_CUR) < 0)
|
||||
return 0;
|
||||
cprm->written += nr;
|
||||
return 1;
|
||||
} else {
|
||||
while (nr > PAGE_SIZE) {
|
||||
if (!dump_emit(cprm, zeroes, PAGE_SIZE))
|
||||
return 0;
|
||||
nr -= PAGE_SIZE;
|
||||
}
|
||||
return dump_emit(cprm, zeroes, nr);
|
||||
}
|
||||
}
|
||||
EXPORT_SYMBOL(dump_skip);
|
||||
|
||||
int dump_align(struct coredump_params *cprm, int align)
|
||||
{
|
||||
unsigned mod = cprm->written & (align - 1);
|
||||
if (align & (align - 1))
|
||||
return 0;
|
||||
return mod ? dump_skip(cprm, align - mod) : 1;
|
||||
}
|
||||
EXPORT_SYMBOL(dump_align);
|
||||
Loading…
Add table
Add a link
Reference in a new issue