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	Thu, 8 Mar 2007 11:52:11 -0500
Subject: Re: wireless extensions vs. 64-bit architectures
From: Johannes Berg <johannes@sipsolutions.net>
To: jt@hpl.hp.com
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On Thu, 2007-03-08 at 15:39 +0100, Johannes Berg wrote:

> Now, I don't know what gcc for ia64 does and I don't have a cross
> compiler to check, but on powerpc it does this.

As expected, the same happens on x86_64 (thanks to Michael Wu for the
debug dump):

 <1><e13>: Abbrev Number: 17 (DW_TAG_structure_type)
     DW_AT_sibling     : <e4c>
     DW_AT_name        : (indirect string, offset: 0x33d): iw_event
     DW_AT_byte_size   : 24
     DW_AT_decl_file   : 100
     DW_AT_decl_line   : 1049
 <2><e20>: Abbrev Number: 18 (DW_TAG_member)
     DW_AT_name        : len
     DW_AT_decl_file   : 100
     DW_AT_decl_line   : 1050
     DW_AT_type        : <58b>
     DW_AT_data_member_location: 2 byte block: 23 0     (DW_OP_plus_uconst:=
 0)
 <2><e2f>: Abbrev Number: 18 (DW_TAG_member)
     DW_AT_name        : cmd
     DW_AT_decl_file   : 100
     DW_AT_decl_line   : 1051
     DW_AT_type        : <58b>
     DW_AT_data_member_location: 2 byte block: 23 2     (DW_OP_plus_uconst:=
 2)
 <2><e3e>: Abbrev Number: 18 (DW_TAG_member)
     DW_AT_name        : u
     DW_AT_decl_file   : 100
     DW_AT_decl_line   : 1052
     DW_AT_type        : <9bf>
     DW_AT_data_member_location: 2 byte block: 23 8     (DW_OP_plus_uconst:=
 8)

Hence, on those machines 32-bit userspace is also broken and we have the
information leak too.

johannes

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