vdso.so mislinked by buggy linker was Re: Linus 2.6.23-rc1

Andi Kleen
2007-07-22T23:56:34Z

On Monday 23 July 2007 01:38:40 Andre Noll wrote:
[readded linux-kernel, Linus]

> [Nr] Name Type Address Offset
> Size EntSize Flags Link Info Align
> [ 0] NULL 0000000000000000 00000000
> 0000000000000000 0000000000000000 0 0 0
> [ 1] .hash HASH ffffffffff700120 00000120
> 00000000000000b4 0000000000000004 A 2 0 8
> [ 2] .dynsym DYNSYM ffffffffff7001d8 000001d8
> 0000000000000270 0000000000000018 A 3 12 8
> [ 3] .dynstr STRTAB ffffffffff700448 00000448
> 0000000000000059 0000000000000000 A 0 0 1
> [ 4] .gnu.version VERSYM ffffffffff7004a2 000004a2
> 0000000000000034 0000000000000002 A 2 0 2
> [ 5] .gnu.version_d VERDEF ffffffffff7004d8 000004d8
> 0000000000000038 0000000000000000 A 3 2 8
> [ 6] .text PROGBITS ffffffffff700c00 00100bab
^^^^^^^^
> 00000000000002e4 0000000000000000 AX 0 0 64

It puts .text at 1MB. Your vdso file must be huge?

It looks like it ignores the
-Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096
options passed to it. The AMD64 ABI has a 1MB minimum page size, but
these options are supposed to disable it.

Not sure how to work around this, but having an 1+MB vdso would be incredibly
wasteful. What version is it? Perhaps we just drop support for this. I can't
think of a workaround currently.

-Andi