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SubjectRe: 2.5.59 vmlinux.lds.S change broke modules
Mikael Pettersson wrote:
> Previously today I wrote:
> > 2.5.59 with CONFIG_PACKET=m oopes when af_packet.ko is insmodded:
> >
> > Unable to handle kernel paging request at virtual address 2220c021
> > printing eip:
> > c0124011
> > *pde = 00000000
> > Oops: 0000
> > CPU: 0
> > EIP: 0060:[<c0124011>] Not tainted
> > EFLAGS: 00010097
> > EIP is at __find_symbol+0x3d/0x7c
> > eax: c020f70e ebx: 00000536 ecx: 00000000 edx: c028b600
> > esi: 2220c021 edi: e8889558 ebp: e8889558 esp: e67c5ecc
> > ds: 007b es: 007b ss: 0068
> > Process insmod (pid: 482, threadinfo=e67c4000 task=e6c80ce0)
> > Stack: e8888f34 e8889a40 00000038 e8883f50 c0124960 e8889558 e67c5ef4 00000001
> > e8888f34 e8889374 e67c5f28 c0124b2a e8883f50 00000016 e8889374 e8889558
> > e8889a40 e8883f50 0000000c 00000017 e8889a40 00000000 0000007c c01253a4
> > Call Trace:
> > [<c0124960>] resolve_symbol+0x20/0x4c
> > [<c0124b2a>] simplify_symbols+0x82/0xe4
> > [<c01253a4>] load_module+0x5c4/0x7ec
> > [<c012562b>] sys_init_module+0x5f/0x194
> > [<c0108887>] syscall_call+0x7/0xb
>
> This oops occurs for every module, not just af_packet.ko, at
> resolve_symbol()'s first call to __find_symbol().
>
> What happens is that __find_symbol() oopses because the kernel's
> symbol table is in la-la land. (Note the bogus kernel adress
> 2220c021 it tried to dereference above.)
>
> Reverting 2.5.59's patch to arch/i386/vmlinux.lds.S cured the
> problem and modules now load correctly for me.
>
> I don't know if this is a problem also for non-i386 archs.
>
> /Mikael

What version of ld are you using?

--
Brian Gerst


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