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proc_parse.c
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proc_parse.c
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#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <dirent.h>
#include <errno.h>
#include <sys/stat.h>
#include <string.h>
#include <ctype.h>
#include <linux/fs.h>
#include "asm/types.h"
#include "list.h"
#include "util.h"
#include "mount.h"
#include "mman.h"
#include "cpu.h"
#include "file-lock.h"
#include "pstree.h"
#include "fsnotify.h"
#include "posix-timer.h"
#include "kerndat.h"
#include "vdso.h"
#include "vma.h"
#include "bfd.h"
#include "proc_parse.h"
#include "cr_options.h"
#include "sysfs_parse.h"
#include "seccomp.h"
#include "namespaces.h"
#include "files-reg.h"
#include "protobuf.h"
#include "protobuf/fdinfo.pb-c.h"
#include "protobuf/mnt.pb-c.h"
#include <stdlib.h>
struct buffer {
char buf[PAGE_SIZE];
char end; /* '\0' */
};
static struct buffer __buf;
static char *buf = __buf.buf;
#define BUF_SIZE sizeof(__buf.buf)
/*
* This is how AIO ring buffers look like in proc
*/
#define AIO_FNAME "/[aio]"
/* check the @line starts with "%lx-%lx" format */
static bool is_vma_range_fmt(char *line)
{
#define ____is_vma_addr_char(__c) \
(((__c) <= '9' && (__c) >= '0') || \
((__c) <= 'f' && (__c) >= 'a'))
while (*line && ____is_vma_addr_char(*line))
line++;
if (*line++ != '-')
return false;
while (*line && ____is_vma_addr_char(*line))
line++;
if (*line++ != ' ')
return false;
return true;
#undef ____is_vma_addr_char
}
static int parse_vmflags(char *buf, struct vma_area *vma_area)
{
char *tok;
bool shared = false;
bool maywrite = false;
if (!buf[0])
return 0;
tok = strtok(buf, " \n");
if (!tok)
return 0;
#define _vmflag_match(_t, _s) (_t[0] == _s[0] && _t[1] == _s[1])
do {
/* open() block */
if (_vmflag_match(tok, "sh"))
shared = true;
else if (_vmflag_match(tok, "mw"))
maywrite = true;
/* mmap() block */
if (_vmflag_match(tok, "gd"))
vma_area->e->flags |= MAP_GROWSDOWN;
else if (_vmflag_match(tok, "lo"))
vma_area->e->flags |= MAP_LOCKED;
else if (_vmflag_match(tok, "nr"))
vma_area->e->flags |= MAP_NORESERVE;
else if (_vmflag_match(tok, "ht"))
vma_area->e->flags |= MAP_HUGETLB;
/* madvise() block */
if (_vmflag_match(tok, "sr"))
vma_area->e->madv |= (1ul << MADV_SEQUENTIAL);
else if (_vmflag_match(tok, "rr"))
vma_area->e->madv |= (1ul << MADV_RANDOM);
else if (_vmflag_match(tok, "dc"))
vma_area->e->madv |= (1ul << MADV_DONTFORK);
else if (_vmflag_match(tok, "dd"))
vma_area->e->madv |= (1ul << MADV_DONTDUMP);
else if (_vmflag_match(tok, "mg"))
vma_area->e->madv |= (1ul << MADV_MERGEABLE);
else if (_vmflag_match(tok, "hg"))
vma_area->e->madv |= (1ul << MADV_HUGEPAGE);
else if (_vmflag_match(tok, "nh"))
vma_area->e->madv |= (1ul << MADV_NOHUGEPAGE);
/* vmsplice doesn't work for VM_IO and VM_PFNMAP mappings. */
if (_vmflag_match(tok, "io") || _vmflag_match(tok, "pf")) {
/*
* VVAR area mapped by the kernel as
* VM_IO | VM_PFNMAP| VM_DONTEXPAND | VM_DONTDUMP
*/
if (!vma_area_is(vma_area, VMA_AREA_VVAR))
vma_area->e->status |= VMA_UNSUPP;
}
/*
* Anything else is just ignored.
*/
} while ((tok = strtok(NULL, " \n")));
#undef _vmflag_match
if (shared && maywrite)
vma_area->e->fdflags = O_RDWR;
else
vma_area->e->fdflags = O_RDONLY;
vma_area->e->has_fdflags = true;
if (vma_area->e->madv)
vma_area->e->has_madv = true;
return 0;
}
static inline int is_anon_shmem_map(dev_t dev)
{
return kdat.shmem_dev == dev;
}
struct vma_file_info {
int dev_maj;
int dev_min;
unsigned long ino;
struct vma_area *vma;
};
static inline int vfi_equal(struct vma_file_info *a, struct vma_file_info *b)
{
return ((a->ino ^ b->ino) |
(a->dev_maj ^ b->dev_maj) |
(a->dev_min ^ b->dev_min)) == 0;
}
static int vma_get_mapfile(char *fname, struct vma_area *vma, DIR *mfd,
struct vma_file_info *vfi, struct vma_file_info *prev_vfi)
{
char path[32];
if (prev_vfi->vma && vfi_equal(vfi, prev_vfi)) {
struct vma_area *prev = prev_vfi->vma;
/*
* If vfi is equal (!) and negative @vm_file_fd --
* we have nothing to borrow for sure.
*/
if (prev->vm_file_fd < 0)
return 0;
pr_debug("vma %"PRIx64" borrows vfi from previous %"PRIx64"\n",
vma->e->start, prev->e->start);
vma->vm_file_fd = prev->vm_file_fd;
if (prev->e->status & VMA_AREA_SOCKET)
vma->e->status |= VMA_AREA_SOCKET | VMA_AREA_REGULAR;
/*
* FIXME -- in theory there can be vmas that have
* dev:ino match, but live in different mount
* namespaces. However, we only borrow files for
* subsequent vmas. These are _very_ likely to
* have files from the same namespaces.
*/
vma->file_borrowed = true;
return 0;
}
/* Figure out if it's file mapping */
snprintf(path, sizeof(path), "%"PRIx64"-%"PRIx64, vma->e->start, vma->e->end);
/*
* Note that we "open" it in dumper process space
* so later we might refer to it via /proc/self/fd/vm_file_fd
* if needed.
*/
vma->vm_file_fd = openat(dirfd(mfd), path, O_RDONLY);
if (vma->vm_file_fd < 0) {
if (errno == ENOENT)
/* Just mapping w/o map_files link */
return 0;
if (errno == ENXIO) {
struct stat buf;
if (fstatat(dirfd(mfd), path, &buf, 0))
return -1;
if (S_ISSOCK(buf.st_mode)) {
pr_info("Found socket mapping @%"PRIx64"\n", vma->e->start);
vma->vm_socket_id = buf.st_ino;
vma->e->status |= VMA_AREA_SOCKET | VMA_AREA_REGULAR;
return 0;
}
if ((buf.st_mode & S_IFMT) == 0 && !strcmp(fname, AIO_FNAME)) {
/* AIO ring, let's try */
close(vma->vm_file_fd);
vma->aio_nr_req = -1;
vma->e->status = VMA_AREA_AIORING;
return 0;
}
pr_err("Unknown shit %o (%s)\n", buf.st_mode, fname);
}
return -1;
}
vma->vmst = xmalloc(sizeof(struct stat));
if (!vma->vmst)
return -1;
/*
* For AUFS support, we need to check if the symbolic link
* points to a branch. If it does, we cannot fstat() its file
* descriptor because it would return a different dev/ino than
* the real file. If fixup_aufs_vma_fd() returns positive,
* it means that it has stat()'ed using the full pathname.
* Zero return means that the symbolic link does not point to
* a branch and we can do fstat() below.
*/
if (opts.aufs) {
int ret;
ret = fixup_aufs_vma_fd(vma);
if (ret < 0)
return -1;
if (ret > 0)
return 0;
}
if (fstat(vma->vm_file_fd, vma->vmst) < 0) {
pr_perror("Failed fstat on map %"PRIx64"", vma->e->start);
return -1;
}
return 0;
}
int parse_self_maps_lite(struct vm_area_list *vms)
{
FILE *maps;
vm_area_list_init(vms);
maps = fopen_proc(PROC_SELF, "maps");
if (maps == NULL) {
pr_perror("Can't open self maps");
return -1;
}
while (fgets(buf, BUF_SIZE, maps) != NULL) {
struct vma_area *vma;
char *end;
vma = alloc_vma_area();
if (!vma) {
fclose(maps);
return -1;
}
vma->e->start = strtoul(buf, &end, 16);
vma->e->end = strtoul(end + 1, NULL, 16);
list_add_tail(&vma->list, &vms->h);
vms->nr++;
pr_debug("Parsed %"PRIx64"-%"PRIx64" vma\n", vma->e->start, vma->e->end);
}
fclose(maps);
return 0;
}
#ifdef CONFIG_VDSO
static inline int handle_vdso_vma(struct vma_area *vma)
{
vma->e->status |= VMA_AREA_REGULAR;
if ((vma->e->prot & VDSO_PROT) == VDSO_PROT)
vma->e->status |= VMA_AREA_VDSO;
return 0;
}
static inline int handle_vvar_vma(struct vma_area *vma)
{
vma->e->status |= VMA_AREA_REGULAR;
if ((vma->e->prot & VVAR_PROT) == VVAR_PROT)
vma->e->status |= VMA_AREA_VVAR;
return 0;
}
#else
static inline int handle_vdso_vma(struct vma_area *vma)
{
pr_warn_once("Found vDSO area without support\n");
return -1;
}
static inline int handle_vvar_vma(struct vma_area *vma)
{
pr_warn_once("Found VVAR area without support\n");
return -1;
}
#endif
static int handle_vma(pid_t pid, struct vma_area *vma_area,
char *file_path, DIR *map_files_dir,
struct vma_file_info *vfi,
struct vma_file_info *prev_vfi,
struct vm_area_list *vma_area_list)
{
if (vma_get_mapfile(file_path, vma_area, map_files_dir, vfi, prev_vfi))
goto err_bogus_mapfile;
if (vma_area->e->status != 0) {
if (vma_area->e->status & VMA_AREA_AIORING)
vma_area_list->nr_aios++;
return 0;
} else if (!strcmp(file_path, "[vsyscall]") ||
!strcmp(file_path, "[vectors]")) {
vma_area->e->status |= VMA_AREA_VSYSCALL;
} else if (!strcmp(file_path, "[vdso]")) {
if (handle_vdso_vma(vma_area))
goto err;
} else if (!strcmp(file_path, "[vvar]")) {
if (handle_vvar_vma(vma_area))
goto err;
} else if (!strcmp(file_path, "[heap]")) {
vma_area->e->status |= VMA_AREA_REGULAR | VMA_AREA_HEAP;
} else {
vma_area->e->status = VMA_AREA_REGULAR;
}
/*
* Some mapping hints for restore, we save this on
* disk and restore might need to analyze it.
*/
if (vma_area->file_borrowed) {
struct vma_area *prev = prev_vfi->vma;
/*
* Pick-up flags that might be set in the branch below.
* Status is copied as-is as it should be zero here,
* and have full match with the previous.
*/
vma_area->e->flags |= (prev->e->flags & MAP_ANONYMOUS);
vma_area->e->status = prev->e->status;
vma_area->e->shmid = prev->e->shmid;
vma_area->vmst = prev->vmst;
vma_area->mnt_id = prev->mnt_id;
} else if (vma_area->vm_file_fd >= 0) {
struct stat *st_buf = vma_area->vmst;
if (S_ISREG(st_buf->st_mode))
/* regular file mapping -- supported */;
else if (S_ISCHR(st_buf->st_mode) && (st_buf->st_rdev == DEVZERO))
/* devzero mapping -- also makes sense */;
else {
pr_err("Can't handle non-regular mapping on %d's map %"PRIx64"\n", pid, vma_area->e->start);
goto err;
}
/*
* /dev/zero stands for anon-shared mapping
* otherwise it's some file mapping.
*/
if (is_anon_shmem_map(st_buf->st_dev)) {
if (!(vma_area->e->flags & MAP_SHARED))
goto err_bogus_mapping;
vma_area->e->flags |= MAP_ANONYMOUS;
vma_area->e->status |= VMA_ANON_SHARED;
vma_area->e->shmid = st_buf->st_ino;
if (!strncmp(file_path, "/SYSV", 5)) {
pr_info("path: %s\n", file_path);
vma_area->e->status |= VMA_AREA_SYSVIPC;
}
} else {
if (vma_area->e->flags & MAP_PRIVATE)
vma_area->e->status |= VMA_FILE_PRIVATE;
else
vma_area->e->status |= VMA_FILE_SHARED;
}
/*
* We cannot use the mnt_id value provided by the kernel
* for vm_file_fd if it is an AUFS file (the value is
* wrong). In such a case, fixup_aufs_vma_fd() has set
* mnt_id to -1 to mimic pre-3.15 kernels that didn't
* have mnt_id.
*/
if (vma_area->mnt_id != -1 &&
get_fd_mntid(vma_area->vm_file_fd, &vma_area->mnt_id))
return -1;
} else {
/*
* No file but mapping -- anonymous one.
*/
if (vma_area->e->flags & MAP_SHARED) {
vma_area->e->status |= VMA_ANON_SHARED;
vma_area->e->shmid = vfi->ino;
} else {
vma_area->e->status |= VMA_ANON_PRIVATE;
}
vma_area->e->flags |= MAP_ANONYMOUS;
}
return 0;
err:
return -1;
err_bogus_mapping:
pr_err("Bogus mapping 0x%"PRIx64"-0x%"PRIx64" (flags: %#x vm_file_fd: %d)\n",
vma_area->e->start, vma_area->e->end,
vma_area->e->flags, vma_area->vm_file_fd);
goto err;
err_bogus_mapfile:
pr_perror("Can't open %d's mapfile link %"PRIx64, pid, vma_area->e->start);
goto err;
}
static int vma_list_add(struct vma_area *vma_area,
struct vm_area_list *vma_area_list,
unsigned long *prev_end,
struct vma_file_info *vfi, struct vma_file_info *prev_vfi)
{
if (vma_area->e->status & VMA_UNSUPP) {
pr_err("Unsupported mapping found %016"PRIx64"-%016"PRIx64"\n",
vma_area->e->start, vma_area->e->end);
return -1;
}
/* Add a guard page only if here is enough space for it */
if ((vma_area->e->flags & MAP_GROWSDOWN) &&
*prev_end < vma_area->e->start)
vma_area->e->start -= PAGE_SIZE; /* Guard page */
*prev_end = vma_area->e->end;
list_add_tail(&vma_area->list, &vma_area_list->h);
vma_area_list->nr++;
if (vma_area_is_private(vma_area, kdat.task_size)) {
unsigned long pages;
pages = vma_area_len(vma_area) / PAGE_SIZE;
vma_area_list->priv_size += pages;
vma_area_list->longest = max(vma_area_list->longest, pages);
}
*prev_vfi = *vfi;
prev_vfi->vma = vma_area;
return 0;
}
int parse_smaps(pid_t pid, struct vm_area_list *vma_area_list)
{
struct vma_area *vma_area = NULL;
unsigned long start, end, pgoff, prev_end = 0;
char r, w, x, s;
int ret = -1;
struct vma_file_info vfi;
struct vma_file_info prev_vfi = {};
DIR *map_files_dir = NULL;
struct bfd f;
vma_area_list->nr = 0;
vma_area_list->nr_aios = 0;
vma_area_list->longest = 0;
vma_area_list->priv_size = 0;
INIT_LIST_HEAD(&vma_area_list->h);
f.fd = open_proc(pid, "smaps");
if (f.fd < 0)
goto err_n;
if (bfdopenr(&f))
goto err_n;
map_files_dir = opendir_proc(pid, "map_files");
if (!map_files_dir) /* old kernel? */
goto err;
while (1) {
int num;
char file_path[32];
bool eof;
char *str;
str = breadline(&f);
if (IS_ERR(str))
goto err;
eof = (str == NULL);
if (!eof && !is_vma_range_fmt(str)) {
if (!strncmp(str, "Nonlinear", 9)) {
BUG_ON(!vma_area);
pr_err("Nonlinear mapping found %016"PRIx64"-%016"PRIx64"\n",
vma_area->e->start, vma_area->e->end);
/*
* VMA is already on list and will be
* freed later as list get destroyed.
*/
vma_area = NULL;
goto err;
} else if (!strncmp(str, "VmFlags: ", 9)) {
BUG_ON(!vma_area);
if (parse_vmflags(&str[9], vma_area))
goto err;
continue;
} else
continue;
}
if (vma_area && vma_list_add(vma_area, vma_area_list,
&prev_end, &vfi, &prev_vfi))
goto err;
if (eof)
break;
vma_area = alloc_vma_area();
if (!vma_area)
goto err;
memzero(file_path, sizeof(file_path));
num = sscanf(str, "%lx-%lx %c%c%c%c %lx %x:%x %lu %31s",
&start, &end, &r, &w, &x, &s, &pgoff,
&vfi.dev_maj, &vfi.dev_min, &vfi.ino, file_path);
if (num < 10) {
pr_err("Can't parse: %s\n", str);
goto err;
}
vma_area->e->start = start;
vma_area->e->end = end;
vma_area->e->pgoff = pgoff;
vma_area->e->prot = PROT_NONE;
if (r == 'r')
vma_area->e->prot |= PROT_READ;
if (w == 'w')
vma_area->e->prot |= PROT_WRITE;
if (x == 'x')
vma_area->e->prot |= PROT_EXEC;
if (s == 's')
vma_area->e->flags = MAP_SHARED;
else if (s == 'p')
vma_area->e->flags = MAP_PRIVATE;
else {
pr_err("Unexpected VMA met (%c)\n", s);
goto err;
}
if (handle_vma(pid, vma_area, file_path, map_files_dir,
&vfi, &prev_vfi, vma_area_list))
goto err;
}
vma_area = NULL;
ret = 0;
err:
bclose(&f);
err_n:
if (map_files_dir)
closedir(map_files_dir);
xfree(vma_area);
return ret;
}
int parse_pid_stat(pid_t pid, struct proc_pid_stat *s)
{
char *tok, *p;
int fd;
int n;
fd = open_proc(pid, "stat");
if (fd < 0)
return -1;
n = read(fd, buf, BUF_SIZE);
if (n < 1) {
pr_err("stat for %d is corrupted\n", pid);
close(fd);
return -1;
}
close(fd);
memset(s, 0, sizeof(*s));
tok = strchr(buf, ' ');
if (!tok)
goto err;
*tok++ = '\0';
if (*tok != '(')
goto err;
s->pid = atoi(buf);
p = strrchr(tok + 1, ')');
if (!p)
goto err;
*tok = '\0';
*p = '\0';
strncpy(s->comm, tok + 1, sizeof(s->comm));
n = sscanf(p + 1,
" %c %d %d %d %d %d %u %lu %lu %lu %lu "
"%lu %lu %ld %ld %ld %ld %d %d %llu %lu %ld %lu %lu %lu %lu "
"%lu %lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld "
"%lu %lu %lu %lu %lu %lu %lu %d",
&s->state,
&s->ppid,
&s->pgid,
&s->sid,
&s->tty_nr,
&s->tty_pgrp,
&s->flags,
&s->min_flt,
&s->cmin_flt,
&s->maj_flt,
&s->cmaj_flt,
&s->utime,
&s->stime,
&s->cutime,
&s->cstime,
&s->priority,
&s->nice,
&s->num_threads,
&s->zero0,
&s->start_time,
&s->vsize,
&s->mm_rss,
&s->rsslim,
&s->start_code,
&s->end_code,
&s->start_stack,
&s->esp,
&s->eip,
&s->sig_pending,
&s->sig_blocked,
&s->sig_ignored,
&s->sig_handled,
&s->wchan,
&s->zero1,
&s->zero2,
&s->exit_signal,
&s->task_cpu,
&s->rt_priority,
&s->policy,
&s->delayacct_blkio_ticks,
&s->gtime,
&s->cgtime,
&s->start_data,
&s->end_data,
&s->start_brk,
&s->arg_start,
&s->arg_end,
&s->env_start,
&s->env_end,
&s->exit_code);
if (n < 50)
goto err;
return 0;
err:
pr_err("Parsing %d's stat failed (#fields do not match)\n", pid);
return -1;
}
static int ids_parse(char *str, unsigned int *arr)
{
char *end;
arr[0] = strtol(str, &end, 10);
arr[1] = strtol(end + 1, &end, 10);
arr[2] = strtol(end + 1, &end, 10);
arr[3] = strtol(end + 1, &end, 10);
if (*end)
return -1;
else
return 0;
}
static int cap_parse(char *str, unsigned int *res)
{
int i, ret;
for (i = 0; i < PROC_CAP_SIZE; i++) {
ret = sscanf(str, "%08x", &res[PROC_CAP_SIZE - 1 - i]);
if (ret != 1)
return -1;
str += 8;
}
return 0;
}
int parse_pid_status(pid_t pid, struct proc_status_creds *cr)
{
struct bfd f;
int done = 0;
int ret = -1;
char *str;
f.fd = open_proc(pid, "status");
if (f.fd < 0) {
pr_perror("Can't open proc status");
return -1;
}
if (bfdopenr(&f))
return -1;
while (done < 9) {
str = breadline(&f);
if (str == NULL)
break;
if (IS_ERR(str))
goto err_parse;
if (!strncmp(str, "State:", 6)) {
cr->state = str[7];
done++;
}
if (!strncmp(str, "PPid:", 5)) {
if (sscanf(str, "PPid:\t%d", &cr->ppid) != 1) {
pr_err("Unable to parse: %s", str);
goto err_parse;
}
done++;
}
if (!strncmp(str, "Uid:", 4)) {
if (ids_parse(str + 5, cr->uids))
goto err_parse;
done++;
}
if (!strncmp(str, "Gid:", 4)) {
if (ids_parse(str + 5, cr->gids))
goto err_parse;
done++;
}
if (!strncmp(str, "CapInh:", 7)) {
if (cap_parse(str + 8, cr->cap_inh))
goto err_parse;
done++;
}
if (!strncmp(str, "CapEff:", 7)) {
if (cap_parse(str + 8, cr->cap_eff))
goto err_parse;
done++;
}
if (!strncmp(str, "CapPrm:", 7)) {
if (cap_parse(str + 8, cr->cap_prm))
goto err_parse;
done++;
}
if (!strncmp(str, "CapBnd:", 7)) {
if (cap_parse(str + 8, cr->cap_bnd))
goto err_parse;
done++;
}
if (!strncmp(str, "Seccomp:", 8)) {
if (sscanf(str + 9, "%d", &cr->seccomp_mode) != 1) {
goto err_parse;
}
if (cr->seccomp_mode == SECCOMP_MODE_FILTER) {
pr_err("SECCOMP_MODE_FILTER not currently supported\n");
goto err_parse;
}
done++;
}
}
if (done >= 8)
ret = 0;
err_parse:
if (ret)
pr_err("Error parsing proc status file\n");
bclose(&f);
return ret;
}
struct opt2flag {
char *opt;
unsigned flag;
};
static int do_opt2flag(char *opt, unsigned *flags,
const struct opt2flag *opts, char *unknown)
{
int i;
char *end;
size_t uoff = 0;
while (1) {
unsigned int id;
end = strchr(opt, ',');
if (end)
*end = '\0';
for (i = 0; opts[i].opt != NULL; i++)
if (!strcmp(opts[i].opt, opt)) {
(*flags) |= opts[i].flag;
break;
}
if (sscanf(opt, "gid=%d", &id) == 1) {
uoff += sprintf(unknown + uoff, "gid=%d", userns_gid(id));
unknown[uoff] = ',';
uoff++;
} else if (sscanf(opt, "uid=%d", &id) == 1) {
uoff += sprintf(unknown + uoff, "uid=%d", userns_uid(id));
unknown[uoff] = ',';
uoff++;
} else if (opts[i].opt == NULL) {
if (!unknown) {
pr_err("Unknown option [%s]\n", opt);
return -1;
}
strcpy(unknown + uoff, opt);
uoff += strlen(opt);
unknown[uoff] = ',';
uoff++;
}
if (!end) {
if (uoff)
uoff--;
if (unknown)
unknown[uoff] = '\0';
break;
} else
opt = end + 1;
}
return 0;
}
static int parse_mnt_flags(char *opt, unsigned *flags)
{
static const struct opt2flag mnt_opt2flag[] = {
{ "rw", 0, },
{ "ro", MS_RDONLY, },
{ "nosuid", MS_NOSUID, },
{ "nodev", MS_NODEV, },
{ "noexec", MS_NOEXEC, },
{ "noatime", MS_NOATIME, },
{ "nodiratime", MS_NODIRATIME, },
{ "relatime", MS_RELATIME, },
{ },
};
if (do_opt2flag(opt, flags, mnt_opt2flag, NULL))
return -1;
/* Otherwise the kernel assumes RELATIME by default */
if ((*flags & (MS_RELATIME | MS_NOATIME)) == 0)
*flags = MS_STRICTATIME;
return 0;
}
static int parse_sb_opt(char *opt, unsigned *flags, char *uopt)
{
static const struct opt2flag sb_opt2flag[] = {
{ "rw", 0, },
{ "ro", MS_RDONLY, },
{ "sync", MS_SYNC, },
{ "dirsync", MS_DIRSYNC, },
{ "mad", MS_MANDLOCK, },
{ },
};
return do_opt2flag(opt, flags, sb_opt2flag, uopt);
}
static int parse_mnt_opt(char *str, struct mount_info *mi, int *off)
{
char *istr = str, *end;
while (1) {
end = strchr(str, ' ');
if (!end) {
pr_err("Error parsing mount options\n");
return -1;
}
*end = '\0';
if (!strncmp(str, "-", 1))
break;
else if (!strncmp(str, "shared:", 7)) {
mi->flags |= MS_SHARED;
mi->shared_id = atoi(str + 7);
} else if (!strncmp(str, "master:", 7)) {
mi->flags |= MS_SLAVE;
mi->master_id = atoi(str + 7);
} else if (!strncmp(str, "propagate_from:", 15)) {
/* skip */;
} else if (!strncmp(str, "unbindable", 11))
mi->flags |= MS_UNBINDABLE;
else {
pr_err("Unknown option [%s]\n", str);
return -1;
}
str = end + 1;
}
*off = end - istr + 1;
return 0;
}
/*
* mountinfo contains mangled paths. space, tab and back slash were replaced
* with usual octal escape. This function replaces these symbols back.
*/
static void cure_path(char *path)
{
int i, len, off = 0;
if (strchr(path, '\\') == NULL) /* fast path */
return;
len = strlen(path);
for (i = 0; i < len; i++) {
if (!strncmp(path + i, "\\040", 4)) {
path[i - off] = ' ';
goto replace;
} else if (!strncmp(path + i, "\\011", 4)) {
path[i - off] = '\t';
goto replace;
} else if (!strncmp(path + i, "\\134", 4)) {
path[i - off] = '\\';
goto replace;
}
if (off)