lkml.org 
[lkml]   [2018]   [Mar]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 13/22] signal: Move addr_lsb into the _sigfault union for clarity
From
Date
On 01/15/2018 04:40 PM, Eric W. Biederman wrote:
> The addr_lsb fields is only valid and available when the
> signal is SIGBUS and the si_code is BUS_MCEERR_AR or BUS_MCEERR_AO.
> Document this with a comment and place the field in the _sigfault union
> to make this clear.
>
> All of the fields stay in the same physical location so both the old
> and new definitions of struct siginfo will continue to work.

This breaks the ABI and breaks protection keys. The physical locations
*DO* change.

Before this patch:

#define si_pkey _sifields._sigfault._pkey
(gdb) print &((siginfo_t *)0)->_sifields._sigfault._pkey
$1 = (__u32 *) 0x20 <irq_stack_union+32>

and after:

+#define si_pkey _sifields._sigfault._addr_pkey._pkey
(gdb) print &((siginfo_t *)0)->_sifields._sigfault._addr_pkey._pkey
$1 = (__u32 *) 0x1c

Can we revert this, please?

\
 
 \ /
  Last update: 2018-03-16 20:01    [W:0.297 / U:0.016 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site