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https://github.com/JakeHillion/drgn.git
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libdrgn: linux_kernel: match explicitly-reported kernel modules by build ID
Currently, we identify explicitly-reported kernel modules by the module name that we get from the .modinfo or the .gnu.linkonce.this_module section. However, objcopy --only-keep-debug (used for some Linux distro's separate debug files) does not keep these sections. This means that passing a file processed by objcopy --only-keep-debug to, e.g., drgn -s, fails with "could not find kernel module name". Instead of using the module name as the identifier, let's use the module's GNU build ID. We can get it on a live system from /sys/module/<module>/notes/, and on a core dump from struct module::notes_attrs (which is the implementation of that sysfs directory). This was split out of my larger debug info discovery rework, which will make more use of the build ID. Closes #178. Signed-off-by: Omar Sandoval <osandov@osandov.com>
This commit is contained in:
Omar Sandoval
parent
c9265ef6d6
commit
ebfcabd5a8
@ -3,12 +3,13 @@
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#include <dirent.h>
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#include <elf.h>
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#include <gelf.h>
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#include <libelf.h>
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#include <stdio.h>
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#include <elfutils/libdwelf.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <gelf.h>
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#include <inttypes.h>
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#include <libelf.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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@ -343,6 +344,8 @@ struct kernel_module_iterator {
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/* /proc/modules file or NULL. */
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FILE *modules_file;
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uint64_t start, end;
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void *build_id_buf;
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size_t build_id_buf_capacity;
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union {
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/* If using /proc/modules. */
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size_t name_capacity;
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@ -366,6 +369,7 @@ static void kernel_module_iterator_deinit(struct kernel_module_iterator *it)
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drgn_object_deinit(&it->node);
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drgn_object_deinit(&it->mod);
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}
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free(it->build_id_buf);
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free(it->name);
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}
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@ -376,6 +380,8 @@ kernel_module_iterator_init(struct kernel_module_iterator *it,
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struct drgn_error *err;
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it->name = NULL;
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it->build_id_buf = NULL;
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it->build_id_buf_capacity = 0;
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if (use_proc_and_sys) {
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it->modules_file = fopen("/proc/modules", "r");
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if (!it->modules_file) {
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@ -532,6 +538,233 @@ kernel_module_iterator_next(struct kernel_module_iterator *it)
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return NULL;
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}
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static size_t parse_gnu_build_id_from_note(const void *note, size_t note_size,
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bool bswap, const void **ret)
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{
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const char *p = note;
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const char *end = p + note_size;
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// Elf64_Nhdr is the same as Elf32_Nhdr.
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Elf32_Nhdr nhdr;
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while (end - p >= sizeof(nhdr)) {
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#define ALIGN_NOTE() do { \
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size_t to_align = (size_t)-(p - (char *)note) % 4; \
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if (to_align > end - p) \
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break; \
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p += to_align; \
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} while (0)
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memcpy(&nhdr, p, sizeof(nhdr));
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if (bswap) {
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nhdr.n_namesz = bswap_32(nhdr.n_namesz);
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nhdr.n_descsz = bswap_32(nhdr.n_descsz);
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nhdr.n_type = bswap_32(nhdr.n_type);
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}
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p += sizeof(nhdr);
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if (nhdr.n_namesz > end - p)
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break;
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const char *name = p;
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p += nhdr.n_namesz;
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ALIGN_NOTE();
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if (nhdr.n_namesz == sizeof("GNU") &&
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memcmp(name, "GNU", sizeof("GNU")) == 0 &&
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nhdr.n_type == NT_GNU_BUILD_ID &&
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nhdr.n_descsz > 0) {
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if (nhdr.n_descsz > end - p)
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break;
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*ret = p;
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return nhdr.n_descsz;
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}
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p += nhdr.n_descsz;
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ALIGN_NOTE();
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#undef ALIGN_NOTE
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}
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*ret = NULL;
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return 0;
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}
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static struct drgn_error *
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kernel_module_iterator_gnu_build_id_live(struct kernel_module_iterator *it,
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const void **build_id_ret,
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size_t *build_id_len_ret)
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{
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struct drgn_error *err;
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char *path;
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if (asprintf(&path, "/sys/module/%s/notes", it->name) == -1)
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return &drgn_enomem;
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DIR *dir = opendir(path);
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if (!dir) {
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err = drgn_error_create_os("opendir", errno, path);
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goto out_path;
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}
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struct dirent *ent;
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while ((errno = 0, ent = readdir(dir))) {
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if (ent->d_type == DT_DIR)
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continue;
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int fd = openat(dirfd(dir), ent->d_name, O_RDONLY);
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if (fd == -1) {
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err = drgn_error_format_os("openat", errno, "%s/%s",
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path, ent->d_name);
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goto out;
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}
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struct stat st;
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if (fstat(fd, &st) < 0) {
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err = drgn_error_format_os("fstat", errno, "%s/%s",
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path, ent->d_name);
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close(fd);
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goto out;
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}
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if (st.st_size > SIZE_MAX ||
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!alloc_or_reuse(&it->build_id_buf,
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&it->build_id_buf_capacity, st.st_size)) {
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err = &drgn_enomem;
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close(fd);
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goto out;
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}
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char *buf = it->build_id_buf;
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size_t size = 0;
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while (size < st.st_size) {
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ssize_t r = read(fd, buf + size, st.st_size - size);
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if (r < 0) {
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if (errno == EINTR)
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continue;
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err = drgn_error_format_os("read", errno,
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"%s/%s", path,
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ent->d_name);
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close(fd);
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goto out;
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} else if (r == 0) {
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break;
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}
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size += r;
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}
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close(fd);
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*build_id_len_ret = parse_gnu_build_id_from_note(buf, size,
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false,
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build_id_ret);
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if (*build_id_len_ret) {
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err = NULL;
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goto out;
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}
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}
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if (errno) {
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err = drgn_error_create_os("readdir", errno, path);
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} else {
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*build_id_ret = NULL;
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*build_id_len_ret = 0;
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err = NULL;
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}
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out:
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closedir(dir);
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out_path:
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free(path);
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return err;
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}
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static struct drgn_error *
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kernel_module_iterator_gnu_build_id(struct kernel_module_iterator *it,
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const void **build_id_ret,
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size_t *build_id_len_ret)
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{
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if (it->modules_file) {
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return kernel_module_iterator_gnu_build_id_live(it,
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build_id_ret,
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build_id_len_ret);
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}
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struct drgn_error *err;
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struct drgn_program *prog = drgn_object_program(&it->mod);
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const bool bswap =
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drgn_type_little_endian(it->mod.type) != HOST_LITTLE_ENDIAN;
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struct drgn_object attrs, attr, tmp;
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drgn_object_init(&attrs, prog);
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drgn_object_init(&attr, prog);
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drgn_object_init(&tmp, prog);
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// n = mod->notes_attrs->notes
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uint64_t n;
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err = drgn_object_member_dereference(&attrs, &it->mod, "notes_attrs");
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if (err)
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goto out;
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err = drgn_object_member_dereference(&tmp, &attrs, "notes");
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if (err)
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goto out;
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err = drgn_object_read_unsigned(&tmp, &n);
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if (err)
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goto out;
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// attrs = mod->notes_attrs->attrs
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err = drgn_object_member_dereference(&attrs, &attrs, "attrs");
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if (err)
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goto out;
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for (uint64_t i = 0; i < n; i++) {
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// attr = attrs[i]
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err = drgn_object_subscript(&attr, &attrs, i);
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if (err)
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goto out;
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// address = attr.private
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err = drgn_object_member(&tmp, &attr, "private");
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if (err)
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goto out;
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uint64_t address;
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err = drgn_object_read_unsigned(&tmp, &address);
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if (err)
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goto out;
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// size = attr.size
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err = drgn_object_member(&tmp, &attr, "size");
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if (err)
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goto out;
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uint64_t size;
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err = drgn_object_read_unsigned(&tmp, &size);
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if (err)
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goto out;
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if (size > SIZE_MAX ||
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!alloc_or_reuse(&it->build_id_buf,
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&it->build_id_buf_capacity, size)) {
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err = &drgn_enomem;
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goto out;
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}
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err = drgn_program_read_memory(prog, it->build_id_buf, address,
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size, false);
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if (err)
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goto out;
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*build_id_len_ret =
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parse_gnu_build_id_from_note(it->build_id_buf, size,
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bswap, build_id_ret);
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if (*build_id_len_ret) {
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err = NULL;
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goto out;
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}
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}
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*build_id_ret = NULL;
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*build_id_len_ret = 0;
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err = NULL;
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out:
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drgn_object_deinit(&tmp);
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drgn_object_deinit(&attr);
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drgn_object_deinit(&attrs);
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return err;
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}
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struct kernel_module_section_iterator {
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struct kernel_module_iterator *kmod_it;
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/* /sys/module/$module/sections directory or NULL. */
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@ -918,26 +1151,21 @@ not_found:
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}
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/*
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* Identify an ELF file as a kernel module, vmlinux, or neither. A kernel module
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* should have sections named .gnu.linkonce.this_module and .modinfo; we return
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* those sections and classify the file as a kernel module if either is present.
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*
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* If neither is present, and the file has a section named .init.text, we
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* classify it as vmlinux.
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* Identify an ELF file as a kernel module, vmlinux, or neither. We classify a
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* file as a kernel module if it has a section named .gnu.linkonce.this_module.
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* If it doesn't, but it does have a section named .init.text, we classify it as
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* vmlinux.
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*/
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static struct drgn_error *identify_kernel_elf(Elf *elf,
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Elf_Scn **this_module_scn_ret,
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Elf_Scn **modinfo_scn_ret,
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bool *is_vmlinux_ret)
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bool *is_vmlinux_ret,
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bool *is_module_ret)
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{
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size_t shstrndx;
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Elf_Scn *scn;
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bool have_init_text = false;
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if (elf_getshdrstrndx(elf, &shstrndx))
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return drgn_error_libelf();
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scn = *this_module_scn_ret = *modinfo_scn_ret = NULL;
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Elf_Scn *scn = NULL;
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bool have_init_text = false;
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while ((scn = elf_nextscn(elf, scn))) {
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GElf_Shdr *shdr, shdr_mem;
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const char *scnname;
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@ -949,81 +1177,16 @@ static struct drgn_error *identify_kernel_elf(Elf *elf,
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scnname = elf_strptr(elf, shstrndx, shdr->sh_name);
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if (!scnname)
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return drgn_error_libelf();
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if (strcmp(scnname, ".gnu.linkonce.this_module") == 0)
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*this_module_scn_ret = scn;
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else if (strcmp(scnname, ".modinfo") == 0)
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*modinfo_scn_ret = scn;
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else if (strcmp(scnname, ".init.text") == 0)
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if (strcmp(scnname, ".gnu.linkonce.this_module") == 0) {
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*is_vmlinux_ret = false;
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*is_module_ret = true;
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return NULL;
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} else if (strcmp(scnname, ".init.text") == 0) {
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have_init_text = true;
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}
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*is_vmlinux_ret = (!*this_module_scn_ret && !*modinfo_scn_ret &&
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have_init_text);
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return NULL;
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}
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/*
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* Since Linux kernel commit 3e2e857f9c3a ("module: Add module name to modinfo")
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* (in v4.13), we can get the module name from .modinfo.
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*/
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static struct drgn_error *
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get_kernel_module_name_from_modinfo(Elf_Scn *modinfo_scn, const char **ret)
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{
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struct drgn_error *err;
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Elf_Data *data;
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const char *p, *end, *nul;
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if (modinfo_scn) {
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err = read_elf_section(modinfo_scn, &data);
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if (err)
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return err;
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if (!data->d_buf) {
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/* Section is either SHT_NOBITS or empty. */
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goto not_found;
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}
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p = data->d_buf;
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end = p + data->d_size;
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while (p < end) {
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nul = memchr(p, 0, end - p);
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if (!nul)
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break;
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if (strstartswith(p, "name=")) {
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*ret = p + 5;
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return NULL;
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}
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p = nul + 1;
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}
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}
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not_found:
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*ret = NULL;
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return NULL;
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}
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/*
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* If the module name isn't in .modinfo, we need to get it from
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* .gnu.linkonce.this_module, which contains a struct module. name_offset is
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* offsetof(struct module, name).
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*/
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static struct drgn_error *
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get_kernel_module_name_from_this_module(Elf_Scn *this_module_scn,
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size_t name_offset, const char **ret)
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{
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struct drgn_error *err;
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Elf_Data *data;
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const char *p, *nul;
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if (this_module_scn) {
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err = read_elf_section(this_module_scn, &data);
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if (err)
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return err;
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if (data->d_buf && name_offset < data->d_size) {
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p = data->d_buf + name_offset;
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nul = memchr(p, 0, data->d_size - name_offset);
|
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if (nul && nul != p) {
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*ret = p;
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return NULL;
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}
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}
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}
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*ret = NULL;
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*is_vmlinux_ret = have_init_text;
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*is_module_ret = false;
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return NULL;
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}
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@ -1107,26 +1270,27 @@ struct kernel_module_file {
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int fd;
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Elf *elf;
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/*
|
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* Kernel module name. This is owned by the Elf handle. Because we use
|
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* this as the key in the kernel_module_table, the file must always be
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* removed from the table before it is reported to the DWARF index
|
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* Kernel module build ID. This is owned by the Elf handle. Because we
|
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* use this as the key in the kernel_module_table, the file must always
|
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* be removed from the table before it is reported to the DWARF index
|
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* (which takes ownership of the Elf handle).
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*/
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const char *name;
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Elf_Scn *this_module_scn;
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/* Next file with the same name. */
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const void *gnu_build_id;
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size_t gnu_build_id_len;
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/* Next file with the same build ID. */
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struct kernel_module_file *next;
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};
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static const char *
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static struct nstring
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kernel_module_table_key(struct kernel_module_file * const *entry)
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{
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return (*entry)->name;
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return (struct nstring){
|
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(*entry)->gnu_build_id, (*entry)->gnu_build_id_len
|
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};
|
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}
|
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|
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DEFINE_HASH_TABLE(kernel_module_table, struct kernel_module_file *,
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kernel_module_table_key, c_string_key_hash_pair,
|
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c_string_key_eq)
|
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kernel_module_table_key, nstring_hash_pair, nstring_eq)
|
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|
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static struct drgn_error *
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report_loaded_kernel_module(struct drgn_debug_info_load_state *load,
|
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@ -1135,10 +1299,19 @@ report_loaded_kernel_module(struct drgn_debug_info_load_state *load,
|
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{
|
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struct drgn_error *err;
|
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|
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const char *name = kmod_it->name;
|
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struct hash_pair hp = kernel_module_table_hash(&name);
|
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struct nstring key;
|
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err = kernel_module_iterator_gnu_build_id(kmod_it,
|
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(const void **)&key.str,
|
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&key.len);
|
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if (err || key.len == 0) {
|
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return drgn_debug_info_report_error(load, kmod_it->name,
|
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"could not find GNU build ID",
|
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err);
|
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}
|
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|
||||
struct hash_pair hp = kernel_module_table_hash(&key);
|
||||
struct kernel_module_table_iterator it =
|
||||
kernel_module_table_search_hashed(kmod_table, &name, hp);
|
||||
kernel_module_table_search_hashed(kmod_table, &key, hp);
|
||||
if (!it.entry)
|
||||
return &drgn_not_found;
|
||||
|
||||
@ -1157,7 +1330,7 @@ report_loaded_kernel_module(struct drgn_debug_info_load_state *load,
|
||||
|
||||
err = drgn_debug_info_report_elf(load, kmod->path, kmod->fd,
|
||||
kmod->elf, kmod_it->start,
|
||||
kmod_it->end, kmod->name,
|
||||
kmod_it->end, kmod_it->name,
|
||||
NULL);
|
||||
kmod->elf = NULL;
|
||||
kmod->fd = -1;
|
||||
@ -1309,7 +1482,7 @@ kernel_module_iterator_error:
|
||||
static struct drgn_error *
|
||||
report_kernel_modules(struct drgn_debug_info_load_state *load,
|
||||
struct kernel_module_file *kmods, size_t num_kmods,
|
||||
bool need_module_definition, bool vmlinux_is_pending)
|
||||
bool vmlinux_is_pending)
|
||||
{
|
||||
struct drgn_program *prog = load->dbinfo->prog;
|
||||
struct drgn_error *err;
|
||||
@ -1330,70 +1503,35 @@ report_kernel_modules(struct drgn_debug_info_load_state *load,
|
||||
/*
|
||||
* If we're not using /proc and /sys, then we need to index vmlinux now
|
||||
* so that we can walk the list of modules in the kernel.
|
||||
*
|
||||
* If we need the definition of struct module to get the name of any
|
||||
* kernel modules, then we also need to index vmlinux now.
|
||||
*/
|
||||
if (vmlinux_is_pending &&
|
||||
(!use_proc_and_sys || need_module_definition)) {
|
||||
if (vmlinux_is_pending && !use_proc_and_sys) {
|
||||
err = drgn_debug_info_report_flush(load);
|
||||
if (err)
|
||||
return err;
|
||||
}
|
||||
|
||||
size_t module_name_offset = 0;
|
||||
if (need_module_definition) {
|
||||
struct drgn_qualified_type module_type;
|
||||
struct drgn_type_member *name_member;
|
||||
uint64_t name_bit_offset;
|
||||
err = drgn_program_find_type(prog, "struct module", NULL,
|
||||
&module_type);
|
||||
if (!err) {
|
||||
err = drgn_type_find_member(module_type.type, "name",
|
||||
&name_member,
|
||||
&name_bit_offset);
|
||||
}
|
||||
if (err) {
|
||||
return drgn_debug_info_report_error(load,
|
||||
"kernel modules",
|
||||
"could not get kernel module names",
|
||||
err);
|
||||
}
|
||||
module_name_offset = name_bit_offset / 8;
|
||||
}
|
||||
|
||||
struct kernel_module_table kmod_table = HASH_TABLE_INIT;
|
||||
struct depmod_index depmod;
|
||||
depmod.addr = NULL;
|
||||
struct kernel_module_table_iterator it;
|
||||
for (size_t i = 0; i < num_kmods; i++) {
|
||||
struct kernel_module_file *kmod = &kmods[i];
|
||||
if (!kmod->name) {
|
||||
err = get_kernel_module_name_from_this_module(kmod->this_module_scn,
|
||||
module_name_offset,
|
||||
&kmod->name);
|
||||
if (err) {
|
||||
err = drgn_debug_info_report_error(load,
|
||||
kmod->path,
|
||||
NULL, err);
|
||||
if (err)
|
||||
goto out;
|
||||
continue;
|
||||
}
|
||||
if (!kmod->name) {
|
||||
err = drgn_debug_info_report_error(load,
|
||||
kmod->path,
|
||||
"could not find kernel module name",
|
||||
NULL);
|
||||
if (err)
|
||||
goto out;
|
||||
continue;
|
||||
}
|
||||
}
|
||||
|
||||
struct hash_pair hp = kernel_module_table_hash(&kmod->name);
|
||||
it = kernel_module_table_search_hashed(&kmod_table, &kmod->name,
|
||||
hp);
|
||||
ssize_t build_id_len =
|
||||
dwelf_elf_gnu_build_id(kmod->elf, &kmod->gnu_build_id);
|
||||
if (build_id_len < 0) {
|
||||
err = drgn_debug_info_report_error(load, kmod->path,
|
||||
NULL,
|
||||
drgn_error_libelf());
|
||||
if (err)
|
||||
goto out;
|
||||
continue;
|
||||
}
|
||||
kmod->gnu_build_id_len = build_id_len;
|
||||
|
||||
struct nstring key = kernel_module_table_key(&kmod);
|
||||
struct hash_pair hp = kernel_module_table_hash(&key);
|
||||
it = kernel_module_table_search_hashed(&kmod_table, &key, hp);
|
||||
if (it.entry) {
|
||||
kmod->next = *it.entry;
|
||||
*it.entry = kmod;
|
||||
@ -1422,7 +1560,7 @@ report_kernel_modules(struct drgn_debug_info_load_state *load,
|
||||
do {
|
||||
err = drgn_debug_info_report_elf(load, kmod->path,
|
||||
kmod->fd, kmod->elf, 0,
|
||||
0, kmod->name, NULL);
|
||||
0, kmod->path, NULL);
|
||||
kmod->elf = NULL;
|
||||
kmod->fd = -1;
|
||||
if (err)
|
||||
@ -1509,7 +1647,6 @@ linux_kernel_report_debug_info(struct drgn_debug_info_load_state *load)
|
||||
* else.
|
||||
*/
|
||||
size_t num_kmods = 0;
|
||||
bool need_module_definition = false;
|
||||
bool vmlinux_is_pending = false;
|
||||
for (size_t i = 0; i < load->num_paths; i++) {
|
||||
const char *path = load->paths[i];
|
||||
@ -1524,10 +1661,8 @@ linux_kernel_report_debug_info(struct drgn_debug_info_load_state *load)
|
||||
continue;
|
||||
}
|
||||
|
||||
Elf_Scn *this_module_scn, *modinfo_scn;
|
||||
bool is_vmlinux;
|
||||
err = identify_kernel_elf(elf, &this_module_scn, &modinfo_scn,
|
||||
&is_vmlinux);
|
||||
bool is_vmlinux, is_module;
|
||||
err = identify_kernel_elf(elf, &is_vmlinux, &is_module);
|
||||
if (err) {
|
||||
err = drgn_debug_info_report_error(load, path, NULL,
|
||||
err);
|
||||
@ -1537,24 +1672,11 @@ linux_kernel_report_debug_info(struct drgn_debug_info_load_state *load)
|
||||
goto out;
|
||||
continue;
|
||||
}
|
||||
if (this_module_scn || modinfo_scn) {
|
||||
if (is_module) {
|
||||
struct kernel_module_file *kmod = &kmods[num_kmods++];
|
||||
kmod->path = path;
|
||||
kmod->fd = fd;
|
||||
kmod->elf = elf;
|
||||
err = get_kernel_module_name_from_modinfo(modinfo_scn,
|
||||
&kmod->name);
|
||||
if (err) {
|
||||
err = drgn_debug_info_report_error(load, path,
|
||||
NULL, err);
|
||||
if (err)
|
||||
goto out;
|
||||
continue;
|
||||
}
|
||||
if (!kmod->name) {
|
||||
kmod->this_module_scn = this_module_scn;
|
||||
need_module_definition = true;
|
||||
}
|
||||
} else if (is_vmlinux) {
|
||||
uint64_t start, end;
|
||||
err = elf_address_range(elf,
|
||||
@ -1593,8 +1715,7 @@ linux_kernel_report_debug_info(struct drgn_debug_info_load_state *load)
|
||||
goto out;
|
||||
}
|
||||
|
||||
err = report_kernel_modules(load, kmods, num_kmods,
|
||||
need_module_definition, vmlinux_is_pending);
|
||||
err = report_kernel_modules(load, kmods, num_kmods, vmlinux_is_pending);
|
||||
out:
|
||||
for (size_t i = 0; i < num_kmods; i++) {
|
||||
elf_end(kmods[i].elf);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user