Messages in this thread Patch in this message | | | Subject | Re: [PATCH] Oops when loading a stripped module | From | Rusty Russell <> | Date | Thu, 26 Aug 2004 19:04:35 +1000 |
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On Fri, 2004-08-20 at 01:52, BlaisorBlade wrote: > I've stripped a module and tried to load it (I know it's meaningless, but it > was for testing; I wanted to strip debug symbols). And to my surprise, the
Thanks.
Name: Don't OOPS on stripped modules Status: Tested on 2.6.9-rc1-bk1 Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (modified) Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade_spam@yahoo.it>
Paulo: > I've stripped a module and tried to load it (I know it's meaningless, but it > was for testing; I wanted to strip debug symbols). And to my surprise, the > kernel Oopsed.
Don't want to go overboard with the checks, but this is simple and reasonable.
diff -urpN --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal .9728-linux-2.6.9-rc1-bk1/kernel/module.c .9728-linux-2.6.9-rc1-bk1.updated/kernel/module.c --- .9728-linux-2.6.9-rc1-bk1/kernel/module.c 2004-08-25 09:54:16.000000000 +1000 +++ .9728-linux-2.6.9-rc1-bk1.updated/kernel/module.c 2004-08-26 18:16:46.000000000 +1000 @@ -1538,9 +1538,6 @@ static struct module *load_module(void _ secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; sechdrs[0].sh_addr = 0; - /* And these should exist, but gcc whinges if we don't init them */ - symindex = strindex = 0; - for (i = 1; i < hdr->e_shnum; i++) { if (sechdrs[i].sh_type != SHT_NOBITS && len < sechdrs[i].sh_offset + sechdrs[i].sh_size) @@ -1572,6 +1569,13 @@ static struct module *load_module(void _ } mod = (void *)sechdrs[modindex].sh_addr; + if (symindex == 0) { + printk(KERN_WARNING "%s: module has no symbols (stripped?)\n", + mod->name); + err = -ENOEXEC; + goto free_hdr; + } + /* Optional sections */ exportindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab"); gplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl"); -- Anyone who quotes me in their signature is an idiot -- Rusty Russell
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