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_smaps(pid_t pid, struct vm_area_list *vma_area_list, bool use_map_files)
{
struct vma_area *vma_area = NULL;
unsigned long start, end, pgoff;
unsigned long ino;
char r, w, x, s;
int dev_maj, dev_min;
int ret = -1;
DIR *map_files_dir = NULL;
FILE *smaps = NULL;
vma_area_list->nr = 0;
vma_area_list->longest = 0;
vma_area_list->priv_size = 0;
INIT_LIST_HEAD(&vma_area_list->h);
smaps = fopen_proc(pid, "smaps");
if (!smaps)
goto err;
if (use_map_files) {
map_files_dir = opendir_proc(pid, "map_files");
if (!map_files_dir) /* old kernel? */
goto err;
}
while (fgets(buf, BUF_SIZE, smaps)) {
int num;
char file_path[6];
if (!is_vma_range_fmt(buf)) {
if (!strncmp(buf, "Nonlinear", 9)) {
BUG_ON(!vma_area);
pr_err("Nonlinear mapping found %016"PRIx64"-%016"PRIx64"\n",
vma_area->vma.start, vma_area->vma.end);
/*
* VMA is already on list and will be
* freed later as list get destroyed.
*/
vma_area = NULL;
goto err;
} else if (!strncmp(buf, "VmFlags: ", 9)) {
BUG_ON(!vma_area);
if (parse_vmflags(&buf[9], vma_area))
goto err;
continue;
} else
continue;
}
vma_area = alloc_vma_area();
if (!vma_area)
goto err;
memset(file_path, 0, 6);
num = sscanf(buf, "%lx-%lx %c%c%c%c %lx %02x:%02x %lu %5s",
&start, &end, &r, &w, &x, &s, &pgoff, &dev_maj,
&dev_min, &ino, file_path);
if (num < 10) {
pr_err("Can't parse: %s\n", buf);
goto err;
}
if (map_files_dir) {
char path[32];
/* Figure out if it's file mapping */
snprintf(path, sizeof(path), "%lx-%lx", start, 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_area->vm_file_fd = openat(dirfd(map_files_dir), path, O_RDONLY);
if (vma_area->vm_file_fd < 0) {
if (errno == ENXIO) {
struct stat buf;
if (fstatat(dirfd(map_files_dir), path, &buf, 0))
goto err_bogus_mapfile;
if (!S_ISSOCK(buf.st_mode))
goto err_bogus_mapfile;
pr_info("Found socket %"PRIu64" mapping @%lx\n", buf.st_ino, start);
vma_area->vma.status |= VMA_AREA_SOCKET | VMA_AREA_REGULAR;
vma_area->vm_socket_id = buf.st_ino;
} else if (errno != ENOENT)
goto err_bogus_mapfile;
}
}
vma_area->vma.start = start;
vma_area->vma.end = end;
vma_area->vma.pgoff = pgoff;
vma_area->vma.prot = PROT_NONE;
if (r == 'r')
vma_area->vma.prot |= PROT_READ;
if (w == 'w')
vma_area->vma.prot |= PROT_WRITE;
if (x == 'x')
vma_area->vma.prot |= PROT_EXEC;
if (s == 's')
vma_area->vma.flags = MAP_SHARED;
else if (s == 'p')
vma_area->vma.flags = MAP_PRIVATE;
else {
pr_err("Unexpected VMA met (%c)\n", s);
goto err;
}
if (vma_area->vma.status != 0) {
goto done;
} else if (strstr(buf, "[vsyscall]")) {
vma_area->vma.status |= VMA_AREA_VSYSCALL;
} else if (strstr(buf, "[vdso]")) {
vma_area->vma.status |= VMA_AREA_REGULAR | VMA_AREA_VDSO;
} else if (strstr(buf, "[heap]")) {
vma_area->vma.status |= VMA_AREA_REGULAR | VMA_AREA_HEAP;
} else {
vma_area->vma.status = VMA_AREA_REGULAR;
}
/*
* Some mapping hints for restore, we save this on
* disk and restore might need to analyze it.
*/
if (vma_area->vm_file_fd >= 0) {
struct stat st_buf;
if (fstat(vma_area->vm_file_fd, &st_buf) < 0) {
pr_perror("Failed fstat on %d's map %lu", pid, start);
goto err;
}
if (!S_ISREG(st_buf.st_mode) &&
!(S_ISCHR(st_buf.st_mode) && st_buf.st_rdev == DEVZERO)) {
pr_err("Can't handle non-regular mapping on %d's map %lu\n", pid, 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->vma.flags & MAP_SHARED))
goto err_bogus_mapping;
vma_area->vma.flags |= MAP_ANONYMOUS;
vma_area->vma.status |= VMA_ANON_SHARED;
vma_area->vma.shmid = st_buf.st_ino;
if (!strcmp(file_path, "/SYSV")) {
pr_info("path: %s\n", file_path);
vma_area->vma.status |= VMA_AREA_SYSVIPC;
}
} else {
if (vma_area->vma.flags & MAP_PRIVATE)
vma_area->vma.status |= VMA_FILE_PRIVATE;
else
vma_area->vma.status |= VMA_FILE_SHARED;
}
} else {
/*
* No file but mapping -- anonymous one.
*/
if (vma_area->vma.flags & MAP_SHARED) {
vma_area->vma.status |= VMA_ANON_SHARED;
vma_area->vma.shmid = ino;
} else {
vma_area->vma.status |= VMA_ANON_PRIVATE;
}
vma_area->vma.flags |= MAP_ANONYMOUS;
}
done:
list_add_tail(&vma_area->list, &vma_area_list->h);
vma_area_list->nr++;
if (privately_dump_vma(vma_area)) {
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);
}
}
vma_area = NULL;
ret = 0;
err:
if (smaps)
fclose(smaps);
if (map_files_dir)
closedir(map_files_dir);
xfree(vma_area);
return ret;
err_bogus_mapping:
pr_err("Bogus mapping 0x%"PRIx64"-0x%"PRIx64" (flags: %#x vm_file_fd: %d)\n",
vma_area->vma.start, vma_area->vma.end,
vma_area->vma.flags, vma_area->vm_file_fd);
goto err;
err_bogus_mapfile:
pr_perror("Can't open %d's mapfile link %lx", pid, start);
goto err;
}
