From: Matt Domsch Separate the module source and header checksum into a separate modinfo field srcversion. With CONFIG_MODULE_SRCVERSION_ALL=y, put srcversion into every module, not just those with MODULE_VERSION("something"). Patch by Rusty Russell, trivial merging and testing by Matt Domsch Signed-off-by: Matt Domsch Signed-off-by: Andrew Morton --- 25-akpm/include/linux/module.h | 6 -- 25-akpm/init/Kconfig | 12 +++++ 25-akpm/scripts/Makefile.modpost | 1 25-akpm/scripts/mod/modpost.c | 65 +++++++++++++++++++++++++++++-- 25-akpm/scripts/mod/modpost.h | 10 ++-- 25-akpm/scripts/mod/sumversion.c | 80 ++++++--------------------------------- 6 files changed, 96 insertions(+), 78 deletions(-) diff -puN include/linux/module.h~modules-put-srcversion-checksum-in-each-modinfo-section include/linux/module.h --- 25/include/linux/module.h~modules-put-srcversion-checksum-in-each-modinfo-section Tue Oct 5 15:13:08 2004 +++ 25-akpm/include/linux/module.h Tue Oct 5 15:13:08 2004 @@ -141,11 +141,9 @@ extern struct module __this_module; customizations, eg "rh3" or "rusty1". Using this automatically adds a checksum of the .c files and the - local headers to the end. Use MODULE_VERSION("") if you want just - this. Macro includes room for this. + local headers in "srcversion". */ -#define MODULE_VERSION(_version) \ - MODULE_INFO(version, _version "\0xxxxxxxxxxxxxxxxxxxxxxxx") +#define MODULE_VERSION(_version) MODULE_INFO(version, _version) /* Given an address, look for it in the exception tables */ const struct exception_table_entry *search_exception_tables(unsigned long add); diff -puN init/Kconfig~modules-put-srcversion-checksum-in-each-modinfo-section init/Kconfig --- 25/init/Kconfig~modules-put-srcversion-checksum-in-each-modinfo-section Tue Oct 5 15:13:08 2004 +++ 25-akpm/init/Kconfig Tue Oct 5 15:13:08 2004 @@ -400,6 +400,18 @@ config MODVERSIONS make them incompatible with the kernel you are running. If unsure, say N. +config MODULE_SRCVERSION_ALL + bool "Source checksum for all modules" + depends on MODULES + help + Modules which contain a MODULE_VERSION get an extra "srcversion" + field inserting into their modinfo section, which contains a + sum of the source files which made it. This helps maintainers + see exactly which source was used to build a module (since + others sometimes change the module source without updating + the version). With this option, such a "srcversion" field + will be created for all modules. If unsure, say N. + config KMOD bool "Automatic kernel module loading" depends on MODULES diff -puN scripts/Makefile.modpost~modules-put-srcversion-checksum-in-each-modinfo-section scripts/Makefile.modpost --- 25/scripts/Makefile.modpost~modules-put-srcversion-checksum-in-each-modinfo-section Tue Oct 5 15:13:08 2004 +++ 25-akpm/scripts/Makefile.modpost Tue Oct 5 15:13:08 2004 @@ -52,6 +52,7 @@ _modpost: $(modules) quiet_cmd_modpost = MODPOST cmd_modpost = scripts/mod/modpost \ $(if $(CONFIG_MODVERSIONS),-m) \ + $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a,) \ $(if $(KBUILD_EXTMOD),-i,-o) $(symverfile) \ $(filter-out FORCE,$^) diff -puN scripts/mod/modpost.c~modules-put-srcversion-checksum-in-each-modinfo-section scripts/mod/modpost.c --- 25/scripts/mod/modpost.c~modules-put-srcversion-checksum-in-each-modinfo-section Tue Oct 5 15:13:08 2004 +++ 25-akpm/scripts/mod/modpost.c Tue Oct 5 15:13:08 2004 @@ -1,7 +1,7 @@ /* Postprocess module symbol versions * * Copyright 2003 Kai Germaschewski - * 2002-2003 Rusty Russell, IBM Corporation + * Copyright 2002-2004 Rusty Russell, IBM Corporation * * Based in part on module-init-tools/depmod.c,file2alias * @@ -18,6 +18,8 @@ int modversions = 0; /* Warn about undefined symbols? (do so if we have vmlinux) */ int have_vmlinux = 0; +/* Is CONFIG_MODULE_SRCVERSION_ALL set? */ +static int all_versions = 0; void fatal(const char *fmt, ...) @@ -397,10 +399,44 @@ is_vmlinux(const char *modname) return strcmp(myname, "vmlinux") == 0; } +/* Parse tag=value strings from .modinfo section */ +static char *next_string(char *string, unsigned long *secsize) +{ + /* Skip non-zero chars */ + while (string[0]) { + string++; + if ((*secsize)-- <= 1) + return NULL; + } + + /* Skip any zero padding. */ + while (!string[0]) { + string++; + if ((*secsize)-- <= 1) + return NULL; + } + return string; +} + +static char *get_modinfo(void *modinfo, unsigned long modinfo_len, + const char *tag) +{ + char *p; + unsigned int taglen = strlen(tag); + unsigned long size = modinfo_len; + + for (p = modinfo; p; p = next_string(p, &size)) { + if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') + return p + taglen + 1; + } + return NULL; +} + void read_symbols(char *modname) { const char *symname; + char *version; struct module *mod; struct elf_info info = { }; Elf_Sym *sym; @@ -424,8 +460,15 @@ read_symbols(char *modname) handle_modversions(mod, &info, sym, symname); handle_moddevtable(mod, &info, sym, symname); } - maybe_frob_version(modname, info.modinfo, info.modinfo_len, - (void *)info.modinfo - (void *)info.hdr); + + version = get_modinfo(info.modinfo, info.modinfo_len, "version"); + if (version) + maybe_frob_rcs_version(modname, version, info.modinfo, + version - (char *)info.hdr); + if (version || (all_versions && !is_vmlinux(modname))) + get_src_version(modname, mod->srcversion, + sizeof(mod->srcversion)-1); + parse_elf_finish(&info); /* Our trick to get versioning for struct_module - it's @@ -571,6 +614,16 @@ add_depends(struct buffer *b, struct mod } void +add_srcversion(struct buffer *b, struct module *mod) +{ + if (mod->srcversion[0]) { + buf_printf(b, "\n"); + buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n", + mod->srcversion); + } +} + +void write_if_changed(struct buffer *b, const char *fname) { char *tmp; @@ -691,7 +744,7 @@ main(int argc, char **argv) char *dump_read = NULL, *dump_write = NULL; int opt; - while ((opt = getopt(argc, argv, "i:mo:")) != -1) { + while ((opt = getopt(argc, argv, "i:mo:a")) != -1) { switch(opt) { case 'i': dump_read = optarg; @@ -702,6 +755,9 @@ main(int argc, char **argv) case 'o': dump_write = optarg; break; + case 'a': + all_versions = 1; + break; default: exit(1); } @@ -724,6 +780,7 @@ main(int argc, char **argv) add_versions(&buf, mod); add_depends(&buf, mod, modules); add_moddevtable(&buf, mod); + add_srcversion(&buf, mod); sprintf(fname, "%s.mod.c", mod->name); write_if_changed(&buf, fname); diff -puN scripts/mod/modpost.h~modules-put-srcversion-checksum-in-each-modinfo-section scripts/mod/modpost.h --- 25/scripts/mod/modpost.h~modules-put-srcversion-checksum-in-each-modinfo-section Tue Oct 5 15:13:08 2004 +++ 25-akpm/scripts/mod/modpost.h Tue Oct 5 15:13:08 2004 @@ -77,6 +77,7 @@ struct module { int has_init; int has_cleanup; struct buffer dev_table_buf; + char srcversion[25]; }; struct elf_info { @@ -95,10 +96,11 @@ void handle_moddevtable(struct module *m void add_moddevtable(struct buffer *buf, struct module *mod); -void maybe_frob_version(const char *modfilename, - void *modinfo, - unsigned long modinfo_len, - unsigned long modinfo_offset); +void maybe_frob_rcs_version(const char *modfilename, + char *version, + void *modinfo, + unsigned long modinfo_offset); +void get_src_version(const char *modname, char sum[], unsigned sumlen); void *grab_file(const char *filename, unsigned long *size); char* get_next_line(unsigned long *pos, void *file, unsigned long size); diff -puN scripts/mod/sumversion.c~modules-put-srcversion-checksum-in-each-modinfo-section scripts/mod/sumversion.c --- 25/scripts/mod/sumversion.c~modules-put-srcversion-checksum-in-each-modinfo-section Tue Oct 5 15:13:08 2004 +++ 25-akpm/scripts/mod/sumversion.c Tue Oct 5 15:13:08 2004 @@ -9,39 +9,6 @@ #include #include "modpost.h" -/* Parse tag=value strings from .modinfo section */ -static char *next_string(char *string, unsigned long *secsize) -{ - /* Skip non-zero chars */ - while (string[0]) { - string++; - if ((*secsize)-- <= 1) - return NULL; - } - - /* Skip any zero padding. */ - while (!string[0]) { - string++; - if ((*secsize)-- <= 1) - return NULL; - } - return string; -} - -static char *get_modinfo(void *modinfo, unsigned long modinfo_len, - const char *tag) -{ - char *p; - unsigned int taglen = strlen(tag); - unsigned long size = modinfo_len; - - for (p = modinfo; p; p = next_string(p, &size)) { - if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') - return p + taglen + 1; - } - return NULL; -} - /* * Stolen form Cryptographic API. * @@ -408,11 +375,11 @@ out: return ret; } -static int get_version(const char *modname, char sum[]) +/* Calc and record src checksum. */ +void get_src_version(const char *modname, char sum[], unsigned sumlen) { void *file; unsigned long len; - int ret = 0; struct md4_ctx md; char *sources, *end, *fname; const char *basename; @@ -432,7 +399,7 @@ static int get_version(const char *modna if (!file) { fprintf(stderr, "Warning: could not find versions for %s\n", filelist); - return 0; + return; } sources = strchr(file, '\n'); @@ -457,12 +424,9 @@ static int get_version(const char *modna goto release; } - /* sum is of form \0. */ - md4_final_ascii(&md, sum, 1 + strlen(sum+1)); - ret = 1; + md4_final_ascii(&md, sum, sumlen); release: release_file(file, len); - return ret; } static void write_version(const char *filename, const char *sum, @@ -492,12 +456,12 @@ out: close(fd); } -void strip_rcs_crap(char *version) +static int strip_rcs_crap(char *version) { unsigned int len, full_len; if (strncmp(version, "$Revision", strlen("$Revision")) != 0) - return; + return 0; /* Space for version string follows. */ full_len = strlen(version) + strlen(version + strlen(version) + 1) + 2; @@ -518,31 +482,15 @@ void strip_rcs_crap(char *version) len++; memmove(version + len, version + strlen(version), full_len - strlen(version)); + return 1; } -/* If the modinfo contains a "version" value, then set this. */ -void maybe_frob_version(const char *modfilename, - void *modinfo, - unsigned long modinfo_len, - unsigned long modinfo_offset) +/* Clean up RCS-style version numbers. */ +void maybe_frob_rcs_version(const char *modfilename, + char *version, + void *modinfo, + unsigned long version_offset) { - char *version, *csum; - - version = get_modinfo(modinfo, modinfo_len, "version"); - if (!version) - return; - - /* RCS $Revision gets stripped out. */ - strip_rcs_crap(version); - - /* Check against double sumversion */ - if (strchr(version, ' ')) - return; - - /* Version contains embedded NUL: second half has space for checksum */ - csum = version + strlen(version); - *(csum++) = ' '; - if (get_version(modfilename, csum)) - write_version(modfilename, version, - modinfo_offset + (version - (char *)modinfo)); + if (strip_rcs_crap(version)) + write_version(modfilename, version, version_offset); } _