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Groups > linux.debian.kernel > #52487

Bug#812928: udev: cdrom_id terminated by signal BUS

Cross-posted to 3 groups.

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On Wed, Jan 27, 2016 at 5:23 PM, Ben Hutchings <ben@decadent.org.uk> wrote:
> Control: tag -1 moreinfo
>
> On Wed, 2016-01-27 at 23:54 +0100, Marco d'Itri wrote:
>> Control: reassign -1 src:linux
>> Control: found -1 4.3.0-1
>> Control: retitle -1 getauxval(AT_RANDOM) broken on sparc64
>>
>> On Jan 27, Anatoly Pugachev <matorola@gmail.com> wrote:
>>
>> > Program terminated with signal SIGUSR1, User defined signal 1.
>> > #0  0x000001000001b9b8 in initialize_srand () at src/basic/random-
>> > util.c:107
>> > 107                     x ^= *(unsigned*) auxv;
>> > (gdb) bt
>> Looks like getauxval(AT_RANDOM) returns garbage on sparc64:
>>
>>         x = 0;
>>         auxv = (void*) getauxval(AT_RANDOM);
>>         if (auxv)
>>                 x ^= *(unsigned*) auxv;
>
> There is no documented alignment guarantee for the AT_RANDOM bytes so I
> think this caller is wrong to treat it as an array of unsigned int.

Also, you can verify that from a debugger without changing the code,
by printing the value of the pointer `auxv` and check if either of the
lower two bits are set.

> What happens if you change it to:
>
>         if (auxv)
>                 memcpy(&x, auxv, sizeof(x));
>
> ?
>
> Ben.
>
> --
> Ben Hutchings
> 73.46% of all statistics are made up.

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Thread

Bug#812928: udev: cdrom_id terminated by signal BUS md@Linux.IT (Marco d'Itri) - 2016-01-28 00:00 +0100
  Processed: Re: Bug#812928: udev: cdrom_id terminated by signal BUS owner@bugs.debian.org (Debian Bug Tracking System) - 2016-01-28 00:20 +0100
  Bug#812928: udev: cdrom_id terminated by signal BUS Ben Hutchings <ben@decadent.org.uk> - 2016-01-28 00:30 +0100
    Processed: Re: Bug#812928: udev: cdrom_id terminated by signal BUS owner@bugs.debian.org (Debian Bug Tracking System) - 2016-01-28 00:50 +0100
    Bug#812928: udev: cdrom_id terminated by signal BUS Patrick Baggett <baggett.patrick@gmail.com> - 2016-01-28 01:40 +0100
      Bug#812928: udev: cdrom_id terminated by signal BUS Anatoly Pugachev <matorola@gmail.com> - 2016-01-28 07:40 +0100
        Bug#812928: udev: cdrom_id terminated by signal BUS John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> - 2016-01-28 10:10 +0100
          Processed: Re: Bug#812928: udev: cdrom_id terminated by signal BUS owner@bugs.debian.org (Debian Bug Tracking System) - 2016-01-28 10:20 +0100

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