dmidocode.c directly accesses memory and assumes it's an x86 without any
checking that the arch is x86.. Randomly scanning arbitrary hunks of
memory on non-x86 as root will lead to all sorts of woe:
memory_scan:
if (!(opt.flags & FLAG_QUIET))
printf("Scanning %s for entry point.\n", opt.devmem);
/* Fallback to memory scan (x86, x86_64) */
if ((buf = mem_chunk(0xF0000, 0x10000, opt.devmem)) == NULL)
{
ret = 1;
goto exit_free;
}
It probably needs wrapping with:
#if defined(__x86_64__) || defined(__x86_64) || \
defined(__i386__) || defined(__i386)
...
#endif
Anyhow, I don't think this is a kernel specific issue. I can trigger
this with various kernels - we just don't protect users with
CAP_SYS_ADMIN rights doing crazy probing on /dev/mem.
** Changed in: dmidecode (Ubuntu)
Assignee: Colin Ian King (colin-king) => (unassigned)
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Packages, which is subscribed to dmidecode in Ubuntu.
https://bugs.launchpad.net/bugs/1858615
Title:
dmidecode triggers system reboot on Inforce 6640
Status in cloud-init:
Invalid
Status in dmidecode package in Ubuntu:
Triaged
Bug description:
Device: Inforce 6640
https://www.inforcecomputing.com/products/single-board-computers-sbc/qualcomm-snapdragon-820-inforce-6640-sbc
SoC: Snapdragon 820
sysname='Linux',
nodename='ubuntu',
release='4.15.0-1069-snapdragon',
version='#76-Ubuntu SMP Tue Nov 26 16:10:14 UTC 2019',
machine='aarch64'
The issue is caused by following commit.
Inforce 6640 doesn't have functional demidecode.
System will reboot when executing dmidecode.
commit 3416e2ee7f65defdb15aab861a85767d13e8c34c
Author: Robert Schweikert <[email protected]>
Date: Sat Oct 29 09:29:53 2016 -0400
dmidecode: Allow dmidecode to be used on aarch64
aarch64 systems have functional dmidecode, so allow that to be used.
- aarch64 has support for dmidecode as well
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