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module: fix crash in get_ksymbol() when oopsing in module init 

Andrew had the sole pleasure of tickling this bug in linux-next; when we set
up "info->strtab" it's pointing into the temporary copy of the module.  For
most uses that is fine, but kallsyms keeps a pointer around during module
load (inside mod->strtab).

If we oops for some reason inside a module's init function, kallsyms will use
the mod->strtab pointer into the now-freed temporary module copy.

(Later oopses work fine: after init we overwrite mod->strtab to point to a
 compacted core-only strtab).

Reported-by: Andrew "Grumpy" Morton <akpm@linux-foundation.org>
Signed-off-by: Rusty "Buggy" Russell <rusty@rustcorp.com.au>
Tested-by: Andrew "Happy" Morton <akpm@linux-foundation.org>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2010-08-05 12:59:08 -06:00
parent eded41c1c6
commit 511ca6ae43
1 changed files with 2 additions and 1 deletions
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3
kernel/module.c
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@ -2045,7 +2045,8 @@ static void add_kallsyms(struct module *mod, struct load_info *info,
mod->symtab = (void *)symsec->sh_addr;
mod->num_symtab = symsec->sh_size / sizeof(Elf_Sym);
mod->strtab = info->strtab;
/* Make sure we get permanent strtab: don't use info->strtab. */
mod->strtab = (void *)info->sechdrs[info->index.str].sh_addr;
/* Set types up while we still have access to sections. */
for (i = 0; i < mod->num_symtab; i++)