diff options
Diffstat (limited to 'kernel/module')
| -rw-r--r-- | kernel/module/Kconfig | 3 | ||||
| -rw-r--r-- | kernel/module/decompress.c | 100 | ||||
| -rw-r--r-- | kernel/module/kallsyms.c | 2 | ||||
| -rw-r--r-- | kernel/module/main.c | 3 | ||||
| -rw-r--r-- | kernel/module/sysfs.c | 2 |
5 files changed, 97 insertions, 13 deletions
diff --git a/kernel/module/Kconfig b/kernel/module/Kconfig index 26ea5d04f56c..424b3bc58f3f 100644 --- a/kernel/module/Kconfig +++ b/kernel/module/Kconfig @@ -221,9 +221,10 @@ endchoice config MODULE_DECOMPRESS bool "Support in-kernel module decompression" - depends on MODULE_COMPRESS_GZIP || MODULE_COMPRESS_XZ + depends on MODULE_COMPRESS_GZIP || MODULE_COMPRESS_XZ || MODULE_COMPRESS_ZSTD select ZLIB_INFLATE if MODULE_COMPRESS_GZIP select XZ_DEC if MODULE_COMPRESS_XZ + select ZSTD_DECOMPRESS if MODULE_COMPRESS_ZSTD help Support for decompressing kernel modules by the kernel itself diff --git a/kernel/module/decompress.c b/kernel/module/decompress.c index c033572d83f0..bb79ac1a6d8f 100644 --- a/kernel/module/decompress.c +++ b/kernel/module/decompress.c @@ -50,7 +50,7 @@ static struct page *module_get_next_page(struct load_info *info) return page; } -#ifdef CONFIG_MODULE_COMPRESS_GZIP +#if defined(CONFIG_MODULE_COMPRESS_GZIP) #include <linux/zlib.h> #define MODULE_COMPRESSION gzip #define MODULE_DECOMPRESS_FN module_gzip_decompress @@ -114,8 +114,8 @@ static ssize_t module_gzip_decompress(struct load_info *info, do { struct page *page = module_get_next_page(info); - if (!page) { - retval = -ENOMEM; + if (IS_ERR(page)) { + retval = PTR_ERR(page); goto out_inflate_end; } @@ -141,7 +141,7 @@ out: kfree(s.workspace); return retval; } -#elif CONFIG_MODULE_COMPRESS_XZ +#elif defined(CONFIG_MODULE_COMPRESS_XZ) #include <linux/xz.h> #define MODULE_COMPRESSION xz #define MODULE_DECOMPRESS_FN module_xz_decompress @@ -173,8 +173,8 @@ static ssize_t module_xz_decompress(struct load_info *info, do { struct page *page = module_get_next_page(info); - if (!page) { - retval = -ENOMEM; + if (IS_ERR(page)) { + retval = PTR_ERR(page); goto out; } @@ -199,6 +199,94 @@ static ssize_t module_xz_decompress(struct load_info *info, xz_dec_end(xz_dec); return retval; } +#elif defined(CONFIG_MODULE_COMPRESS_ZSTD) +#include <linux/zstd.h> +#define MODULE_COMPRESSION zstd +#define MODULE_DECOMPRESS_FN module_zstd_decompress + +static ssize_t module_zstd_decompress(struct load_info *info, + const void *buf, size_t size) +{ + static const u8 signature[] = { 0x28, 0xb5, 0x2f, 0xfd }; + ZSTD_outBuffer zstd_dec; + ZSTD_inBuffer zstd_buf; + zstd_frame_header header; + size_t wksp_size; + void *wksp = NULL; + ZSTD_DStream *dstream; + size_t ret; + size_t new_size = 0; + int retval; + + if (size < sizeof(signature) || + memcmp(buf, signature, sizeof(signature))) { + pr_err("not a zstd compressed module\n"); + return -EINVAL; + } + + zstd_buf.src = buf; + zstd_buf.pos = 0; + zstd_buf.size = size; + + ret = zstd_get_frame_header(&header, zstd_buf.src, zstd_buf.size); + if (ret != 0) { + pr_err("ZSTD-compressed data has an incomplete frame header\n"); + retval = -EINVAL; + goto out; + } + if (header.windowSize > (1 << ZSTD_WINDOWLOG_MAX)) { + pr_err("ZSTD-compressed data has too large a window size\n"); + retval = -EINVAL; + goto out; + } + + wksp_size = zstd_dstream_workspace_bound(header.windowSize); + wksp = kmalloc(wksp_size, GFP_KERNEL); + if (!wksp) { + retval = -ENOMEM; + goto out; + } + + dstream = zstd_init_dstream(header.windowSize, wksp, wksp_size); + if (!dstream) { + pr_err("Can't initialize ZSTD stream\n"); + retval = -ENOMEM; + goto out; + } + + do { + struct page *page = module_get_next_page(info); + + if (!IS_ERR(page)) { + retval = PTR_ERR(page); + goto out; + } + + zstd_dec.dst = kmap_local_page(page); + zstd_dec.pos = 0; + zstd_dec.size = PAGE_SIZE; + + ret = zstd_decompress_stream(dstream, &zstd_dec, &zstd_buf); + kunmap(page); + retval = zstd_get_error_code(ret); + if (retval) + break; + + new_size += zstd_dec.pos; + } while (zstd_dec.pos == PAGE_SIZE && ret != 0); + + if (retval) { + pr_err("ZSTD-decompression failed with status %d\n", retval); + retval = -EINVAL; + goto out; + } + + retval = new_size; + + out: + kfree(wksp); + return retval; +} #else #error "Unexpected configuration for CONFIG_MODULE_DECOMPRESS" #endif diff --git a/kernel/module/kallsyms.c b/kernel/module/kallsyms.c index f5c5c9175333..4523f99b0358 100644 --- a/kernel/module/kallsyms.c +++ b/kernel/module/kallsyms.c @@ -494,7 +494,6 @@ unsigned long module_kallsyms_lookup_name(const char *name) return ret; } -#ifdef CONFIG_LIVEPATCH int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *, unsigned long), void *data) @@ -531,4 +530,3 @@ out: mutex_unlock(&module_mutex); return ret; } -#endif /* CONFIG_LIVEPATCH */ diff --git a/kernel/module/main.c b/kernel/module/main.c index 7b3f6fb0d428..48568a0f5651 100644 --- a/kernel/module/main.c +++ b/kernel/module/main.c @@ -85,9 +85,6 @@ struct mod_tree_root mod_data_tree __cacheline_aligned = { }; #endif -#define module_addr_min mod_tree.addr_min -#define module_addr_max mod_tree.addr_max - struct symsearch { const struct kernel_symbol *start, *stop; const s32 *crcs; diff --git a/kernel/module/sysfs.c b/kernel/module/sysfs.c index ce68f821dcd1..c921bf044050 100644 --- a/kernel/module/sysfs.c +++ b/kernel/module/sysfs.c @@ -340,7 +340,7 @@ static int mod_sysfs_init(struct module *mod) int err; struct kobject *kobj; - if (!module_sysfs_initialized) { + if (!module_kset) { pr_err("%s: module sysfs not initialized\n", mod->name); err = -EINVAL; goto out; |