Public bug reported:
Package: sg3-utils 1.48-3ubuntu3
Ubuntu: 26.04 (Resolute Raccoon)
Binary: sg_wr_mode version "1.30 20230623"
sg_wr_mode rejects every --contents= and --cfile= argument before
opening the target device, regardless of value. The rejection fires from
argv parsing — it's not device-specific.
Repro (any of these):
$ sg_wr_mode --page=8 --contents=0,1 /dev/null
bad argument to '--contents='
$ sg_wr_mode --page=8 --contents="08 12 01" /dev/null
bad argument to '--contents='
$ sg_wr_mode -p 8 -c 08,12,01 /dev/null
bad argument to '--contents='
$ printf '\x08\x12\x01' > /tmp/page.bin
$ sg_wr_mode --page=8 --cfile=/tmp/page.bin /dev/null
bad argument to '--cfile='
Exit code: 32 in every case.
strace confirms the failure is pre-I/O: libsgutils2-1.48.so.2 loads,
then the error is written to stderr and the process exits — the device
is never opened. So the bug is in sg_wr_mode's argv handler, not the
underlying SCSI layer.
Confirmed not device-related: same failure against /dev/sg1 (a QEMU CD-
ROM SCSI generic device). sg_inq and sg_modes against the same device
work normally — only sg_wr_mode's argument parser rejects --contents=.
The sg3-utils library and the device are both healthy; the bug is
isolated to sg_wr_mode.
Workaround: issue MODE SELECT(10) directly via sg_raw, e.g.: sg_raw -v
-s 28 -i payload.bin /dev/sgN 55 10 00 00 00 00 00 00 1C 00
Expected: --contents= should accept the documented "comma-separated
string of hex numbers (00..ff)" syntax (per the man page and --help
text).
Actual: every value is rejected.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: sg3-utils 1.48-3ubuntu3
ProcVersionSignature: Ubuntu 7.0.0-15.15-generic 7.0.0
Uname: Linux 7.0.0-15-generic x86_64
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: pass
Date: Sat May 9 13:59:51 2026
InstallationDate: Installed on 2026-05-02 (7 days ago)
InstallationMedia: Ubuntu-Server 26.04 "Resolute Raccoon" - Release amd64
(20260420.1)
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
SourcePackage: sg3-utils
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: sg3-utils (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute
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https://bugs.launchpad.net/bugs/2152092
Title:
sg_wr_mode rejects every --contents= and --cfile= argument with "bad
argument"
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