Adding upstream version 32+20240327.upstream/32+20240327upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

17 files changed, 433 insertions, 133 deletions

diff --git a/.gitignore b/.gitignore
index 29b3102..799897e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -26,6 +26,8 @@
 /libtool
 /stamp-h1
 /test-suite.log
+/build
+/build-*
 
 *~
 .*.swp
diff --git a/Makefile.am b/Makefile.am
index d37b56d..e2e2411 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -96,8 +96,8 @@ libkmod_libkmod_internal_la_LDFLAGS = $(AM_LDFLAGS) \
 libkmod_libkmod_internal_la_DEPENDENCIES  = $(libkmod_libkmod_la_DEPENDENCIES)
 libkmod_libkmod_internal_la_LIBADD = $(libkmod_libkmod_la_LIBADD)
 
-pkgconfigdir = $(libdir)/pkgconfig
-pkgconfig_DATA = libkmod/libkmod.pc tools/kmod.pc
+pkgconfig_DATA = libkmod/libkmod.pc
+noarch_pkgconfig_DATA = tools/kmod.pc
 
 bashcompletiondir=@bashcompletiondir@
 dist_bashcompletion_DATA = \
@@ -113,7 +113,7 @@ install-exec-hook:
 	fi
 if BUILD_TOOLS
 	for tool in insmod lsmod rmmod depmod modprobe modinfo; do \
-		$(LN_S) kmod $(DESTDIR)$(bindir)/$$tool; \
+		$(LN_S) -f kmod $(DESTDIR)$(bindir)/$$tool; \
 	done
 endif
 
diff --git a/configure.ac b/configure.ac
index b651b5f..a80780e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -231,6 +231,9 @@ GTK_DOC_CHECK([1.14],[--flavour no-tmpl-flat])
 ], [
 AM_CONDITIONAL([ENABLE_GTK_DOC], false)])
 
+PKG_INSTALLDIR
+PKG_NOARCH_INSTALLDIR
+
 #####################################################################
 # Default CFLAGS and LDFLAGS
 #####################################################################
diff --git a/libkmod/docs/libkmod-sections.txt b/libkmod/docs/libkmod-sections.txt
index 33d9eec..978b064 100644
--- a/libkmod/docs/libkmod-sections.txt
+++ b/libkmod/docs/libkmod-sections.txt
@@ -37,6 +37,7 @@ kmod_config_get_remove_commands
 kmod_config_get_aliases
 kmod_config_get_options
 kmod_config_get_softdeps
+kmod_config_get_weakdeps
 kmod_config_iter_get_key
 kmod_config_iter_get_value
 kmod_config_iter_next
@@ -62,6 +63,7 @@ kmod_module_remove_module
 kmod_module_get_module
 kmod_module_get_dependencies
 kmod_module_get_softdeps
+kmod_module_get_weakdeps
 kmod_module_apply_filter
 kmod_module_get_filtered_blacklist
 kmod_module_get_install_commands
diff --git a/libkmod/libkmod-config.c b/libkmod/libkmod-config.c
index e83621b..a571b6b 100644
--- a/libkmod/libkmod-config.c
+++ b/libkmod/libkmod-config.c
@@ -58,6 +58,12 @@ struct kmod_softdep {
 	unsigned int n_post;
 };
 
+struct kmod_weakdep {
+	char *name;
+	const char **weak;
+	unsigned int n_weak;
+};
+
 const char *kmod_blacklist_get_modname(const struct kmod_list *l)
 {
 	return l->data;
@@ -110,6 +116,16 @@ const char * const *kmod_softdep_get_post(const struct kmod_list *l, unsigned in
 	return dep->post;
 }
 
+const char *kmod_weakdep_get_name(const struct kmod_list *l) {
+	const struct kmod_weakdep *dep = l->data;
+	return dep->name;
+}
+
+const char * const *kmod_weakdep_get_weak(const struct kmod_list *l, unsigned int *count) {
+	const struct kmod_weakdep *dep = l->data;
+	*count = dep->n_weak;
+	return dep->weak;
+}
 static int kmod_config_add_command(struct kmod_config *config,
 						const char *modname,
 						const char *command,
@@ -392,6 +408,112 @@ static int kmod_config_add_softdep(struct kmod_config *config,
 	return 0;
 }
 
+static int kmod_config_add_weakdep(struct kmod_config *config,
+							const char *modname,
+							const char *line)
+{
+	struct kmod_list *list;
+	struct kmod_weakdep *dep;
+	const char *s, *p;
+	char *itr;
+	unsigned int n_weak = 0;
+	size_t modnamelen = strlen(modname) + 1;
+	size_t buflen = 0;
+	bool was_space = false;
+
+	DBG(config->ctx, "modname=%s\n", modname);
+
+	/* analyze and count */
+	for (p = s = line; ; s++) {
+		size_t plen;
+
+		if (*s != '\0') {
+			if (!isspace(*s)) {
+				was_space = false;
+				continue;
+			}
+
+			if (was_space) {
+				p = s + 1;
+				continue;
+			}
+			was_space = true;
+
+			if (p >= s)
+				continue;
+		}
+		plen = s - p;
+
+		if (*s != '\0' || (*s == '\0' && !was_space)) {
+			buflen += plen + 1;
+			n_weak++;
+		}
+		p = s + 1;
+		if (*s == '\0')
+			break;
+	}
+
+	DBG(config->ctx, "%u weak\n", n_weak);
+
+	dep = malloc(sizeof(struct kmod_weakdep) + modnamelen +
+		     n_weak * sizeof(const char *) +
+		     buflen);
+	if (dep == NULL) {
+		ERR(config->ctx, "out-of-memory modname=%s\n", modname);
+		return -ENOMEM;
+	}
+	dep->n_weak = n_weak;
+	dep->weak = (const char **)((char *)dep + sizeof(struct kmod_weakdep));
+	dep->name = (char *)(dep->weak + n_weak);
+
+	memcpy(dep->name, modname, modnamelen);
+
+	/* copy strings */
+	itr = dep->name + modnamelen;
+	n_weak = 0;
+	was_space = false;
+	for (p = s = line; ; s++) {
+		size_t plen;
+
+		if (*s != '\0') {
+			if (!isspace(*s)) {
+				was_space = false;
+				continue;
+			}
+
+			if (was_space) {
+				p = s + 1;
+				continue;
+			}
+			was_space = true;
+
+			if (p >= s)
+				continue;
+		}
+		plen = s - p;
+
+		if (*s != '\0' || (*s == '\0' && !was_space)) {
+			dep->weak[n_weak] = itr;
+			memcpy(itr, p, plen);
+			itr[plen] = '\0';
+			itr += plen + 1;
+			n_weak++;
+		}
+		p = s + 1;
+		if (*s == '\0')
+			break;
+	}
+
+	list = kmod_list_append(config->weakdeps, dep);
+	if (list == NULL) {
+		free(dep);
+		return -ENOMEM;
+	}
+	config->weakdeps = list;
+
+	return 0;
+}
+
 static char *softdep_to_char(struct kmod_softdep *dep) {
 	const size_t sz_preprefix = sizeof("pre: ") - 1;
 	const size_t sz_postprefix = sizeof("post: ") - 1;
@@ -461,6 +583,44 @@ static char *softdep_to_char(struct kmod_softdep *dep) {
 	return s;
 }
 
+static char *weakdep_to_char(struct kmod_weakdep *dep) {
+	size_t sz;
+	const char *start, *end;
+	char *s, *itr;
+
+	/*
+	 * Rely on the fact that dep->weak[] and are strv's that point to a
+	 * contiguous buffer
+	 */
+	if (dep->n_weak > 0) {
+		start = dep->weak[0];
+		end = dep->weak[dep->n_weak - 1]
+					+ strlen(dep->weak[dep->n_weak - 1]);
+		sz = end - start;
+	} else
+		sz = 0;
+
+	itr = s = malloc(sz);
+	if (s == NULL)
+		return NULL;
+
+	if (sz) {
+		char *p;
+
+		/* include last '\0' */
+		memcpy(itr, dep->weak[0], sz + 1);
+		for (p = itr; p < itr + sz; p++) {
+			if (*p == '\0')
+				*p = ' ';
+		}
+		itr = p;
+	}
+
+	*itr = '\0';
+
+	return s;
+}
+
 static void kmod_config_free_softdep(struct kmod_config *config,
 							struct kmod_list *l)
 {
@@ -468,6 +628,13 @@ static void kmod_config_free_softdep(struct kmod_config *config,
 	config->softdeps = kmod_list_remove(l);
 }
 
+static void kmod_config_free_weakdep(struct kmod_config *config,
+							struct kmod_list *l)
+{
+	free(l->data);
+	config->weakdeps = kmod_list_remove(l);
+}
+
 static void kcmdline_parse_result(struct kmod_config *config, char *modname,
 						char *param, char *value)
 {
@@ -703,6 +870,14 @@ static int kmod_config_parse(struct kmod_config *config, int fd,
 				goto syntax_error;
 
 			kmod_config_add_softdep(config, modname, softdeps);
+		} else if (streq(cmd, "weakdep")) {
+			char *modname = strtok_r(NULL, "\t ", &saveptr);
+			char *weakdeps = strtok_r(NULL, "\0", &saveptr);
+
+			if (underscores(modname) < 0 || weakdeps == NULL)
+				goto syntax_error;
+
+			kmod_config_add_weakdep(config, modname, weakdeps);
 		} else if (streq(cmd, "include")
 				|| streq(cmd, "config")) {
 			ERR(ctx, "%s: command %s is deprecated and not parsed anymore\n",
@@ -746,6 +921,9 @@ void kmod_config_free(struct kmod_config *config)
 	while (config->softdeps)
 		kmod_config_free_softdep(config, config->softdeps);
 
+	while (config->weakdeps)
+		kmod_config_free_weakdep(config, config->weakdeps);
+
 	for (; config->paths != NULL;
 				config->paths = kmod_list_remove(config->paths))
 		free(config->paths->data);
@@ -889,6 +1067,7 @@ int kmod_config_new(struct kmod_ctx *ctx, struct kmod_config **p_config,
 	size_t i;
 
 	conf_files_insert_sorted(ctx, &list, kmod_get_dirname(ctx), "modules.softdep");
+	conf_files_insert_sorted(ctx, &list, kmod_get_dirname(ctx), "modules.weakdep");
 
 	for (i = 0; config_paths[i] != NULL; i++) {
 		const char *path = config_paths[i];
@@ -973,6 +1152,7 @@ enum config_type {
 	CONFIG_TYPE_ALIAS,
 	CONFIG_TYPE_OPTION,
 	CONFIG_TYPE_SOFTDEP,
+	CONFIG_TYPE_WEAKDEP,
 };
 
 struct kmod_config_iter {
@@ -991,6 +1171,12 @@ static const char *softdep_get_plain_softdep(const struct kmod_list *l)
 	return s;
 }
 
+static const char *weakdep_get_plain_weakdep(const struct kmod_list *l)
+{
+	char *s = weakdep_to_char(l->data);
+	return s;
+}
+
 static struct kmod_config_iter *kmod_config_iter_new(const struct kmod_ctx* ctx,
 							enum config_type type)
 {
@@ -1033,6 +1219,12 @@ static struct kmod_config_iter *kmod_config_iter_new(const struct kmod_ctx* ctx,
 		iter->get_value = softdep_get_plain_softdep;
 		iter->intermediate = true;
 		break;
+	case CONFIG_TYPE_WEAKDEP:
+		iter->list = config->weakdeps;
+		iter->get_key = kmod_weakdep_get_name;
+		iter->get_value = weakdep_get_plain_weakdep;
+		iter->intermediate = true;
+		break;
 	}
 
 	return iter;
@@ -1164,6 +1356,26 @@ KMOD_EXPORT struct kmod_config_iter *kmod_config_get_softdeps(const struct kmod_
 }
 
 /**
+ * kmod_config_get_weakdeps:
+ * @ctx: kmod library context
+ *
+ * Retrieve an iterator to deal with the weakdeps maintained inside the
+ * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
+ * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
+ * be made to initialize the iterator and check if it's valid.
+ *
+ * Returns: a new iterator over the weakdeps or NULL on failure. Free it with
+ * kmod_config_iter_free_iter().
+ */
+KMOD_EXPORT struct kmod_config_iter *kmod_config_get_weakdeps(const struct kmod_ctx *ctx)
+{
+	if (ctx == NULL)
+		return NULL;;
+
+	return kmod_config_iter_new(ctx, CONFIG_TYPE_WEAKDEP);
+}
+
+/**
  * kmod_config_iter_get_key:
  * @iter: iterator over a certain configuration
  *
diff --git a/libkmod/libkmod-file.c b/libkmod/libkmod-file.c
index b138e7e..8baf12d 100644
--- a/libkmod/libkmod-file.c
+++ b/libkmod/libkmod-file.c
@@ -41,27 +41,12 @@
 #include "libkmod.h"
 #include "libkmod-internal.h"
 
-struct kmod_file;
-struct file_ops {
-	int (*load)(struct kmod_file *file);
-	void (*unload)(struct kmod_file *file);
-};
-
 struct kmod_file {
-#ifdef ENABLE_ZSTD
-	bool zstd_used;
-#endif
-#ifdef ENABLE_XZ
-	bool xz_used;
-#endif
-#ifdef ENABLE_ZLIB
-	gzFile gzf;
-#endif
 	int fd;
 	enum kmod_file_compression_type compression;
 	off_t size;
 	void *memory;
-	const struct file_ops *ops;
+	int (*load)(struct kmod_file *file);
 	const struct kmod_ctx *ctx;
 	struct kmod_elf *elf;
 };
@@ -179,7 +164,6 @@ static int load_zstd(struct kmod_file *file)
 
 	ZSTD_freeDStream(dstr);
 	free((void *)zst_inb.src);
-	file->zstd_used = true;
 	file->memory = zst_outb.dst;
 	file->size = zst_outb.pos;
 	return 0;
@@ -190,16 +174,14 @@ out:
 	free((void *)zst_outb.dst);
 	return ret;
 }
-
-static void unload_zstd(struct kmod_file *file)
+#else
+static int load_zstd(struct kmod_file *file)
 {
-	if (!file->zstd_used)
-		return;
-	free(file->memory);
+	return -ENOSYS;
 }
+#endif
 
 static const char magic_zstd[] = {0x28, 0xB5, 0x2F, 0xFD};
-#endif
 
 #ifdef ENABLE_XZ
 static void xz_uncompress_belch(struct kmod_file *file, lzma_ret ret)
@@ -272,7 +254,6 @@ static int xz_uncompress(lzma_stream *strm, struct kmod_file *file)
 			goto out;
 		}
 	}
-	file->xz_used = true;
 	file->memory = p;
 	file->size = total;
 	return 0;
@@ -299,16 +280,14 @@ static int load_xz(struct kmod_file *file)
 	lzma_end(&strm);
 	return ret;
 }
-
-static void unload_xz(struct kmod_file *file)
+#else
+static int load_xz(struct kmod_file *file)
 {
-	if (!file->xz_used)
-		return;
-	free(file->memory);
+	return -ENOSYS;
 }
+#endif
 
 static const char magic_xz[] = {0xfd, '7', 'z', 'X', 'Z', 0};
-#endif
 
 #ifdef ENABLE_ZLIB
 #define READ_STEP (4 * 1024 * 1024)
@@ -317,12 +296,19 @@ static int load_zlib(struct kmod_file *file)
 	int err = 0;
 	off_t did = 0, total = 0;
 	_cleanup_free_ unsigned char *p = NULL;
+	gzFile gzf;
+	int gzfd;
 
 	errno = 0;
-	file->gzf = gzdopen(file->fd, "rb");
-	if (file->gzf == NULL)
+	gzfd = fcntl(file->fd, F_DUPFD_CLOEXEC, 3);
+	if (gzfd < 0)
 		return -errno;
-	file->fd = -1; /* now owned by gzf due gzdopen() */
+
+	gzf = gzdopen(gzfd, "rb"); /* takes ownership of the fd */
+	if (gzf == NULL) {
+		close(gzfd);
+		return -errno;
+	}
 
 	for (;;) {
 		int r;
@@ -337,12 +323,12 @@ static int load_zlib(struct kmod_file *file)
 			p = tmp;
 		}
 
-		r = gzread(file->gzf, p + did, total - did);
+		r = gzread(gzf, p + did, total - did);
 		if (r == 0)
 			break;
 		else if (r < 0) {
 			int gzerr;
-			const char *gz_errmsg = gzerror(file->gzf, &gzerr);
+			const char *gz_errmsg = gzerror(gzf, &gzerr);
 
 			ERR(file->ctx, "gzip: %s\n", gz_errmsg);
 
@@ -356,41 +342,21 @@ static int load_zlib(struct kmod_file *file)
 	file->memory = p;
 	file->size = did;
 	p = NULL;
+	gzclose(gzf);
 	return 0;
 
 error:
-	gzclose(file->gzf);
+	gzclose(gzf); /* closes the gzfd */
 	return err;
 }
-
-static void unload_zlib(struct kmod_file *file)
+#else
+static int load_zlib(struct kmod_file *file)
 {
-	if (file->gzf == NULL)
-		return;
-	free(file->memory);
-	gzclose(file->gzf); /* closes file->fd */
+	return -ENOSYS;
 }
-
-static const char magic_zlib[] = {0x1f, 0x8b};
 #endif
 
-static const struct comp_type {
-	size_t magic_size;
-	enum kmod_file_compression_type compression;
-	const char *magic_bytes;
-	const struct file_ops ops;
-} comp_types[] = {
-#ifdef ENABLE_ZSTD
-	{sizeof(magic_zstd),	KMOD_FILE_COMPRESSION_ZSTD, magic_zstd, {load_zstd, unload_zstd}},
-#endif
-#ifdef ENABLE_XZ
-	{sizeof(magic_xz),	KMOD_FILE_COMPRESSION_XZ, magic_xz, {load_xz, unload_xz}},
-#endif
-#ifdef ENABLE_ZLIB
-	{sizeof(magic_zlib),	KMOD_FILE_COMPRESSION_ZLIB, magic_zlib, {load_zlib, unload_zlib}},
-#endif
-	{0,			KMOD_FILE_COMPRESSION_NONE, NULL, {NULL, NULL}}
-};
+static const char magic_zlib[] = {0x1f, 0x8b};
 
 static int load_reg(struct kmod_file *file)
 {
@@ -402,27 +368,39 @@ static int load_reg(struct kmod_file *file)
 	file->size = st.st_size;
 	file->memory = mmap(NULL, file->size, PROT_READ, MAP_PRIVATE,
 			    file->fd, 0);
-	if (file->memory == MAP_FAILED)
+	if (file->memory == MAP_FAILED) {
+		file->memory = NULL;
 		return -errno;
+	}
 
 	return 0;
 }
 
-static void unload_reg(struct kmod_file *file)
-{
-	munmap(file->memory, file->size);
-}
-
-static const struct file_ops reg_ops = {
-	load_reg, unload_reg
+static const struct comp_type {
+	size_t magic_size;
+	enum kmod_file_compression_type compression;
+	const char *magic_bytes;
+	int (*load)(struct kmod_file *file);
+} comp_types[] = {
+	{sizeof(magic_zstd),	KMOD_FILE_COMPRESSION_ZSTD, magic_zstd, load_zstd},
+	{sizeof(magic_xz),	KMOD_FILE_COMPRESSION_XZ, magic_xz, load_xz},
+	{sizeof(magic_zlib),	KMOD_FILE_COMPRESSION_ZLIB, magic_zlib, load_zlib},
+	{0,			KMOD_FILE_COMPRESSION_NONE, NULL, load_reg}
 };
 
 struct kmod_elf *kmod_file_get_elf(struct kmod_file *file)
 {
+	int err;
+
 	if (file->elf)
 		return file->elf;
 
-	kmod_file_load_contents(file);
+	err = kmod_file_load_contents(file);
+	if (err) {
+		errno = err;
+		return NULL;
+	}
+
 	file->elf = kmod_elf_new(file->memory, file->size);
 	return file->elf;
 }
@@ -430,81 +408,63 @@ struct kmod_elf *kmod_file_get_elf(struct kmod_file *file)
 struct kmod_file *kmod_file_open(const struct kmod_ctx *ctx,
 						const char *filename)
 {
-	struct kmod_file *file = calloc(1, sizeof(struct kmod_file));
-	const struct comp_type *itr;
-	size_t magic_size_max = 0;
-	int err = 0;
+	struct kmod_file *file;
+	char buf[7];
+	ssize_t sz;
 
+	assert_cc(sizeof(magic_zstd) < sizeof(buf));
+	assert_cc(sizeof(magic_xz) < sizeof(buf));
+	assert_cc(sizeof(magic_zlib) < sizeof(buf));
+
+	file = calloc(1, sizeof(struct kmod_file));
 	if (file == NULL)
 		return NULL;
 
 	file->fd = open(filename, O_RDONLY|O_CLOEXEC);
 	if (file->fd < 0) {
-		err = -errno;
-		goto error;
+		free(file);
+		return NULL;
 	}
 
-	for (itr = comp_types; itr->ops.load != NULL; itr++) {
-		if (magic_size_max < itr->magic_size)
-			magic_size_max = itr->magic_size;
-	}
+	sz = read_str_safe(file->fd, buf, sizeof(buf));
+	lseek(file->fd, 0, SEEK_SET);
+	if (sz != (sizeof(buf) - 1)) {
+		if (sz < 0)
+			errno = -sz;
+		else
+			errno = EINVAL;
 
-	if (magic_size_max > 0) {
-		char *buf = alloca(magic_size_max + 1);
-		ssize_t sz;
+		close(file->fd);
+		free(file);
+		return NULL;
+	}
 
-		if (buf == NULL) {
-			err = -errno;
-			goto error;
-		}
-		sz = read_str_safe(file->fd, buf, magic_size_max + 1);
-		lseek(file->fd, 0, SEEK_SET);
-		if (sz != (ssize_t)magic_size_max) {
-			if (sz < 0)
-				err = sz;
-			else
-				err = -EINVAL;
-			goto error;
-		}
+	for (unsigned int i = 0; i < ARRAY_SIZE(comp_types); i++) {
+		const struct comp_type *itr = &comp_types[i];
 
-		for (itr = comp_types; itr->ops.load != NULL; itr++) {
-			if (memcmp(buf, itr->magic_bytes, itr->magic_size) == 0) {
-				file->ops = &itr->ops;
-				file->compression = itr->compression;
-				break;
-			}
+		file->load = itr->load;
+		file->compression = itr->compression;
+		if (itr->magic_size &&
+		    memcmp(buf, itr->magic_bytes, itr->magic_size) == 0) {
+			break;
 		}
 	}
 
-	if (file->ops == NULL) {
-		file->ops = &reg_ops;
-		file->compression = KMOD_FILE_COMPRESSION_NONE;
-	}
-
 	file->ctx = ctx;
 
-error:
-	if (err < 0) {
-		if (file->fd >= 0)
-			close(file->fd);
-		free(file);
-		errno = -err;
-		return NULL;
-	}
-
 	return file;
 }
 
 /*
  *  Callers should just check file->memory got updated
  */
-void kmod_file_load_contents(struct kmod_file *file)
+int kmod_file_load_contents(struct kmod_file *file)
 {
 	if (file->memory)
-		return;
+		return 0;
 
 	/*  The load functions already log possible errors. */
-	file->ops->load(file);
+	return file->load(file);
 }
 
 void *kmod_file_get_contents(const struct kmod_file *file)
@@ -532,10 +492,13 @@ void kmod_file_unref(struct kmod_file *file)
 	if (file->elf)
 		kmod_elf_unref(file->elf);
 
-	if (file->memory)
-		file->ops->unload(file);
+	if (file->compression == KMOD_FILE_COMPRESSION_NONE) {
+		if (file->memory)
+			munmap(file->memory, file->size);
+	} else {
+		free(file->memory);
+	}
 
-	if (file->fd >= 0)
-		close(file->fd);
+	close(file->fd);
 	free(file);
 }
diff --git a/libkmod/libkmod-internal.h b/libkmod/libkmod-internal.h
index 26a7e28..4e1cc20 100644
--- a/libkmod/libkmod-internal.h
+++ b/libkmod/libkmod-internal.h
@@ -128,6 +128,7 @@ struct kmod_config {
 	struct kmod_list *remove_commands;
 	struct kmod_list *install_commands;
 	struct kmod_list *softdeps;
+	struct kmod_list *weakdeps;
 
 	struct kmod_list *paths;
 };
@@ -146,6 +147,8 @@ const char *kmod_softdep_get_name(const struct kmod_list *l) __attribute__((nonn
 const char * const *kmod_softdep_get_pre(const struct kmod_list *l, unsigned int *count) __attribute__((nonnull(1, 2)));
 const char * const *kmod_softdep_get_post(const struct kmod_list *l, unsigned int *count);
 
+const char *kmod_weakdep_get_name(const struct kmod_list *l) __attribute__((nonnull(1)));
+const char * const *kmod_weakdep_get_weak(const struct kmod_list *l, unsigned int *count) __attribute__((nonnull(1, 2)));
 
 /* libkmod-module.c */
 int kmod_module_new_from_alias(struct kmod_ctx *ctx, const char *alias, const char *name, struct kmod_module **mod);
@@ -160,7 +163,7 @@ bool kmod_module_is_builtin(struct kmod_module *mod) __attribute__((nonnull(1)))
 /* libkmod-file.c */
 struct kmod_file *kmod_file_open(const struct kmod_ctx *ctx, const char *filename) _must_check_ __attribute__((nonnull(1,2)));
 struct kmod_elf *kmod_file_get_elf(struct kmod_file *file) __attribute__((nonnull(1)));
-void kmod_file_load_contents(struct kmod_file *file) __attribute__((nonnull(1)));
+int kmod_file_load_contents(struct kmod_file *file) __attribute__((nonnull(1)));
 void *kmod_file_get_contents(const struct kmod_file *file) _must_check_ __attribute__((nonnull(1)));
 off_t kmod_file_get_size(const struct kmod_file *file) _must_check_ __attribute__((nonnull(1)));
 enum kmod_file_compression_type kmod_file_get_compression(const struct kmod_file *file) _must_check_ __attribute__((nonnull(1)));
diff --git a/libkmod/libkmod-module.c b/libkmod/libkmod-module.c
index 585da41..5c26e03 100644
--- a/libkmod/libkmod-module.c
+++ b/libkmod/libkmod-module.c
@@ -903,8 +903,6 @@ static int do_init_module(struct kmod_module *mod, unsigned int flags,
 	off_t size;
 	int err;
 
-	kmod_file_load_contents(mod->file);
-
 	if (flags & (KMOD_INSERT_FORCE_VERMAGIC | KMOD_INSERT_FORCE_MODVERSION)) {
 		elf = kmod_file_get_elf(mod->file);
 		if (elf == NULL) {
@@ -926,6 +924,10 @@ static int do_init_module(struct kmod_module *mod, unsigned int flags,
 
 		mem = kmod_elf_get_memory(elf);
 	} else {
+		err = kmod_file_load_contents(mod->file);
+		if (err)
+			return err;
+
 		mem = kmod_file_get_contents(mod->file);
 	}
 	size = kmod_file_get_size(mod->file);
@@ -1589,7 +1591,7 @@ void kmod_module_set_install_commands(struct kmod_module *mod, const char *cmd)
 	mod->install_commands = cmd;
 }
 
-static struct kmod_list *lookup_softdep(struct kmod_ctx *ctx, const char * const * array, unsigned int count)
+static struct kmod_list *lookup_dep(struct kmod_ctx *ctx, const char * const * array, unsigned int count)
 {
 	struct kmod_list *ret = NULL;
 	unsigned i;
@@ -1601,7 +1603,7 @@ static struct kmod_list *lookup_softdep(struct kmod_ctx *ctx, const char * const
 
 		err = kmod_module_new_from_lookup(ctx, depname, &lst);
 		if (err < 0) {
-			ERR(ctx, "failed to lookup soft dependency '%s', continuing anyway.\n", depname);
+			ERR(ctx, "failed to lookup dependency '%s', continuing anyway.\n", depname);
 			continue;
 		} else if (lst != NULL)
 			ret = kmod_list_append_list(ret, lst);
@@ -1650,9 +1652,59 @@ KMOD_EXPORT int kmod_module_get_softdeps(const struct kmod_module *mod,
 			continue;
 
 		array = kmod_softdep_get_pre(l, &count);
-		*pre = lookup_softdep(mod->ctx, array, count);
+		*pre = lookup_dep(mod->ctx, array, count);
 		array = kmod_softdep_get_post(l, &count);
-		*post = lookup_softdep(mod->ctx, array, count);
+		*post = lookup_dep(mod->ctx, array, count);
+
+		/*
+		 * find only the first command, as modprobe from
+		 * module-init-tools does
+		 */
+		break;
+	}
+
+	return 0;
+}
+
+/*
+ * kmod_module_get_weakdeps:
+ * @mod: kmod module
+ * @weak: where to save the list of weak dependencies.
+ *
+ * Get weak dependencies for this kmod module. Weak dependencies come
+ * from configuration file and are not cached in @mod because it may include
+ * dependency cycles that would make we leak kmod_module. Any call
+ * to this function will search for this module in configuration, allocate a
+ * list and return the result.
+ *
+ * @weak is newly created list of kmod_module and
+ * should be unreferenced with kmod_module_unref_list().
+ *
+ * Returns: 0 on success or < 0 otherwise.
+ */
+KMOD_EXPORT int kmod_module_get_weakdeps(const struct kmod_module *mod,
+						struct kmod_list **weak)
+{
+	const struct kmod_list *l;
+	const struct kmod_config *config;
+
+	if (mod == NULL || weak == NULL)
+		return -ENOENT;
+
+	assert(*weak == NULL);
+
+	config = kmod_get_config(mod->ctx);
+
+	kmod_list_foreach(l, config->weakdeps) {
+		const char *modname = kmod_weakdep_get_name(l);
+		const char * const *array;
+		unsigned count;
+
+		if (fnmatch(modname, mod->name, 0) != 0)
+			continue;
+
+		array = kmod_weakdep_get_weak(l, &count);
+		*weak = lookup_dep(mod->ctx, array, count);
 
 		/*
 		 * find only the first command, as modprobe from
diff --git a/libkmod/libkmod.h b/libkmod/libkmod.h
index 7251aa7..fce66d1 100644
--- a/libkmod/libkmod.h
+++ b/libkmod/libkmod.h
@@ -112,6 +112,7 @@ struct kmod_config_iter *kmod_config_get_remove_commands(const struct kmod_ctx *
 struct kmod_config_iter *kmod_config_get_aliases(const struct kmod_ctx *ctx);
 struct kmod_config_iter *kmod_config_get_options(const struct kmod_ctx *ctx);
 struct kmod_config_iter *kmod_config_get_softdeps(const struct kmod_ctx *ctx);
+struct kmod_config_iter *kmod_config_get_weakdeps(const struct kmod_ctx *ctx);
 const char *kmod_config_iter_get_key(const struct kmod_config_iter *iter);
 const char *kmod_config_iter_get_value(const struct kmod_config_iter *iter);
 bool kmod_config_iter_next(struct kmod_config_iter *iter);
@@ -196,6 +197,8 @@ const char *kmod_module_get_remove_commands(const struct kmod_module *mod);
 struct kmod_list *kmod_module_get_dependencies(const struct kmod_module *mod);
 int kmod_module_get_softdeps(const struct kmod_module *mod,
 				struct kmod_list **pre, struct kmod_list **post);
+int kmod_module_get_weakdeps(const struct kmod_module *mod,
+				struct kmod_list **weak);
 int kmod_module_get_filtered_blacklist(const struct kmod_ctx *ctx,
 					const struct kmod_list *input,
 					struct kmod_list **output) __attribute__ ((deprecated));
diff --git a/libkmod/libkmod.sym b/libkmod/libkmod.sym
index 0c04fda..0d6d338 100644
--- a/libkmod/libkmod.sym
+++ b/libkmod/libkmod.sym
@@ -21,6 +21,7 @@ global:
 	kmod_config_get_aliases;
 	kmod_config_get_options;
 	kmod_config_get_softdeps;
+	kmod_config_get_weakdeps;
 	kmod_config_iter_get_key;
 	kmod_config_iter_get_value;
 	kmod_config_iter_next;
@@ -42,6 +43,7 @@ global:
 
 	kmod_module_get_dependencies;
 	kmod_module_get_softdeps;
+	kmod_module_get_weakdeps;
 	kmod_module_get_filtered_blacklist;
 
 	kmod_module_get_name;
diff --git a/man/modprobe.d.5.xml b/man/modprobe.d.5.xml
index 2bf6537..cc90da6 100644
--- a/man/modprobe.d.5.xml
+++ b/man/modprobe.d.5.xml
@@ -212,6 +212,30 @@
           </para>
         </listitem>
       </varlistentry>
+      <varlistentry>
+        <term>weakdep <replaceable>modulename</replaceable> <replaceable>modules...</replaceable>
+        </term>
+        <listitem>
+          <para>
+            The <command>weakdep</command> command allows you to specify weak module
+            dependencies. Those are similar to pre softdep, with the
+            difference that userspace doesn't attempt to load that
+            dependency before the specified module. Instead the kernel
+            may request one or multiple of them during module probe,
+            depending on the hardware it's binding to. The purpose of
+            weak module is to allow a driver to specify that a certain
+            dependency may be needed, so it should be present in the
+            filesystem (e.g. in initramfs) when that module is probed.
+          </para>
+	  <para>
+            Example: Assume "weakdep c a b". A program creating an
+            initramfs knows it should add a, b, and c to the filesystem
+            since a and b may be required/desired at runtime. When c is
+            loaded and is being probed, it may issue calls to
+            request_module() causing a or b to also be loaded.
+          </para>
+        </listitem>
+      </varlistentry>
     </variablelist>
   </refsect1>
   <refsect1><title>COMPATIBILITY</title>
diff --git a/testsuite/module-playground/mod-fake-scsi-mod.c b/testsuite/module-playground/mod-fake-scsi-mod.c
index 916a04d..f335b6f 100644
--- a/testsuite/module-playground/mod-fake-scsi-mod.c
+++ b/testsuite/module-playground/mod-fake-scsi-mod.c
@@ -1,6 +1,8 @@
 #include <linux/init.h>
 #include <linux/module.h>
 
+void dummy_export(void);
+
 static int __init test_module_init(void)
 {
 	return 0;
diff --git a/testsuite/module-playground/mod-foo-a.c b/testsuite/module-playground/mod-foo-a.c
index bc65f66..4eeeb0b 100644
--- a/testsuite/module-playground/mod-foo-a.c
+++ b/testsuite/module-playground/mod-foo-a.c
@@ -4,6 +4,8 @@
 #include <linux/module.h>
 #include <linux/printk.h>
 
+void print_fooA(void);
+
 static int __init foo_init(void)
 {
 	return 0;
diff --git a/testsuite/module-playground/mod-foo-b.c b/testsuite/module-playground/mod-foo-b.c
index 09079f6..0c92b1b 100644
--- a/testsuite/module-playground/mod-foo-b.c
+++ b/testsuite/module-playground/mod-foo-b.c
@@ -4,6 +4,8 @@
 #include <linux/module.h>
 #include <linux/printk.h>
 
+void print_fooB(void);
+
 static int __init foo_init(void)
 {
 	return 0;
diff --git a/testsuite/module-playground/mod-foo-c.c b/testsuite/module-playground/mod-foo-c.c
index 3afd35d..a8917c8 100644
--- a/testsuite/module-playground/mod-foo-c.c
+++ b/testsuite/module-playground/mod-foo-c.c
@@ -4,6 +4,8 @@
 #include <linux/module.h>
 #include <linux/printk.h>
 
+void print_fooC(void);
+
 static int __init foo_init(void)
 {
 	return 0;
diff --git a/tools/depmod.c b/tools/depmod.c
index 43fc354..06618fa 100644
--- a/tools/depmod.c
+++ b/tools/depmod.c
@@ -2296,6 +2296,30 @@ static int output_softdeps(struct depmod *depmod, FILE *out)
 	return 0;
 }
 
+static int output_weakdeps(struct depmod *depmod, FILE *out)
+{
+	size_t i;
+
+	fputs("# Weak dependencies extracted from modules themselves.\n", out);
+
+	for (i = 0; i < depmod->modules.count; i++) {
+		const struct mod *mod = depmod->modules.array[i];
+		struct kmod_list *l;
+
+		kmod_list_foreach(l, mod->info_list) {
+			const char *key = kmod_module_info_get_key(l);
+			const char *value = kmod_module_info_get_value(l);
+
+			if (!streq(key, "weakdep"))
+				continue;
+
+			fprintf(out, "weakdep %s %s\n", mod->modname, value);
+		}
+	}
+
+	return 0;
+}
+
 static int output_symbols(struct depmod *depmod, FILE *out)
 {
 	struct hash_iter iter;
@@ -2574,6 +2598,7 @@ static int depmod_output(struct depmod *depmod, FILE *out)
 		{ "modules.alias", output_aliases },
 		{ "modules.alias.bin", output_aliases_bin },
 		{ "modules.softdep", output_softdeps },
+		{ "modules.weakdep", output_weakdeps },
 		{ "modules.symbols", output_symbols },
 		{ "modules.symbols.bin", output_symbols_bin },
 		{ "modules.builtin.bin", output_builtin_bin },
diff --git a/tools/modprobe.c b/tools/modprobe.c
index 5306bef..4328da6 100644
--- a/tools/modprobe.c
+++ b/tools/modprobe.c
@@ -182,6 +182,7 @@ static int show_config(struct kmod_ctx *ctx)
 		{ "alias", kmod_config_get_aliases },
 		{ "options", kmod_config_get_options },
 		{ "softdep", kmod_config_get_softdeps },
+		{ "weakdep", kmod_config_get_weakdeps },
 	};
 	size_t i;