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Laurent Vivier 6e1c0d7b95 linux-user: manage binfmt-misc preserve-arg[0] flag 
Add --preserve-argv0 in qemu-binfmt-conf.sh to configure the preserve-argv0
flag.

This patch allows to use new flag in AT_FLAGS to detect if
preserve-argv0 is configured for this interpreter:
argv[0] (the full pathname provided by binfmt-misc) is removed and
replaced by argv[1] (the original argv[0] provided by binfmt-misc when
'P'/preserve-arg[0] is set)

For instance with this patch and kernel support for AT_FLAGS:

  $ sudo chroot m68k-chroot sh -c 'echo $0'
  sh

without this patch:

  $ sudo chroot m68k-chroot sh -c 'echo $0'
  /usr/bin/sh

The new flag is available in kernel (v5.12) since:
2347961b11d4 ("binfmt_misc: pass binfmt_misc flags to the interpreter")

This can be tested with something like:

  # cp ..../qemu-ppc /chroot/powerpc/jessie

  # qemu-binfmt-conf.sh --qemu-path / --systemd ppc --credential yes \
                        --persistent no --preserve-argv0 yes
  # systemctl restart systemd-binfmt.service
  # cat /proc/sys/fs/binfmt_misc/qemu-ppc
  enabled
  interpreter //qemu-ppc
  flags: POC
  offset 0
  magic 7f454c4601020100000000000000000000020014
  mask ffffffffffffff00fffffffffffffffffffeffff
  # chroot /chroot/powerpc/jessie  sh -c 'echo $0'
  sh

  # qemu-binfmt-conf.sh --qemu-path / --systemd ppc --credential yes \
                        --persistent no --preserve-argv0 no
  # systemctl restart systemd-binfmt.service
  # cat /proc/sys/fs/binfmt_misc/qemu-ppc
  enabled
  interpreter //qemu-ppc
  flags: OC
  offset 0
  magic 7f454c4601020100000000000000000000020014
  mask ffffffffffffff00fffffffffffffffffffeffff
  # chroot /chroot/powerpc/jessie  sh -c 'echo $0'
  /bin/sh

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20210222105004.1642234-1-laurent@vivier.eu>
2021-03-13 10:45:11 +01:00
..
ci scripts/ci/gitlab-pipeline-status: give more info when pipeline not found 2021-03-09 06:03:53 +01:00
coccinelle scripts/coccinelle: New script to remove unnecessary timer_del() calls 2021-01-08 15:13:38 +00:00
codeconverter scripts/codeconverter: Update to latest version 2020-09-18 14:12:32 -04:00
coverity-scan Remove texinfo dependency from docker and CI configs 2020-09-29 17:55:39 +02:00
kvm scripts/kvm/vmxcap: Use Python 3 interpreter and add pseudo-main() 2020-05-31 13:56:46 +02:00
modules scripts/modules/module_block: Use Python 3 interpreter & add pseudo-main 2020-05-31 13:56:46 +02:00
oss-fuzz fuzz: fix wrong index in clear_bits 2021-02-08 14:43:54 +01:00
performance scripts/performance: Add dissect.py script 2020-07-14 22:22:22 +02:00
qapi qapi: Fix parse errors for removal of null from schema language 2021-03-05 15:40:50 +01:00
qemu-guest-agent
qemugdb scripts/gdb: implement 'qemu bt' 2021-01-12 12:38:03 +01:00
qmp docs: update to show preferred boolean syntax for -chardev 2021-02-25 14:14:33 +01:00
simplebench simplebench: add bench-backup.py 2021-01-26 14:36:37 +01:00
tracetool scripts/tracetool: Replace the word 'whitelist' 2021-03-09 22:14:26 +01:00
analyse-9p-simpletrace.py drop "from __future__ import print_function" 2020-02-07 15:15:16 +01:00
analyse-locks-simpletrace.py drop "from __future__ import print_function" 2020-02-07 15:15:16 +01:00
analyze-inclusions
analyze-migration.py nomaintainer: Fix Lesser GPL version number 2020-11-15 17:04:40 +01:00
archive-source.sh build-sys: add meson submodule 2020-08-21 06:30:06 -04:00
block-coroutine-wrapper.py scripts: add block-coroutine-wrapper.py 2020-10-05 10:59:06 +01:00
check_sparse.py meson: move sparse detection to Meson and rewrite check_sparse.py 2020-10-04 18:36:23 +02:00
checkpatch.pl checkpatch: don't emit warning on newly created acpi data files 2021-02-23 10:58:42 -05:00
clean-header-guards.pl scripts/: fix some comment spelling errors 2020-09-17 20:37:55 +02:00
clean-includes meson: rename included C source files to .c.inc 2020-08-21 06:18:30 -04:00
cleanup-trace-events.pl scripts/cleanup-trace-events: Emit files in alphabetical order 2020-09-09 17:17:00 +01:00
cocci-macro-file.h compiler.h: remove QEMU_GNUC_PREREQ 2020-12-15 12:53:15 -05:00
coverity-model.c
decodetree.py decodetree: Open files with encoding='utf-8' 2021-01-13 08:39:08 -10:00
device-crash-test device-crash-test: Remove problematic language 2021-02-18 18:34:47 -05:00
disas-objdump.pl
dump-guest-memory.py drop "from __future__ import print_function" 2020-02-07 15:15:16 +01:00
entitlement.sh hvf: Sign the code after installation 2021-02-25 13:57:34 +01:00
extract-vsssdk-headers
feature_to_c.sh meson: cpu-emu 2020-08-21 06:30:39 -04:00
fix-multiline-comments.sh docs: move CODING_STYLE into the developer documentation 2021-02-24 11:05:21 +00:00
gensyscalls.sh Hexagon (linux-user/hexagon) Linux user emulation 2021-02-18 07:48:22 -08:00
get_maintainer.pl get_maintainer: update repo URL to GitLab 2021-02-09 20:53:56 +00:00
git-submodule.sh configure: replace --enable/disable-git-update with --with-git-submodules 2021-01-29 17:07:53 +00:00
git.orderfile scripts/git.orderfile: Keep files with .inc extension sorted 2020-12-15 12:53:16 -05:00
hxtool meson: generate hxtool files 2020-08-21 06:30:14 -04:00
hxtool-conv.pl scripts/hxtool-conv: Archive script used in qemu-options.hx conversion 2020-03-06 10:05:24 +00:00
kernel-doc scripts: kernel-doc: remove unnecessary change wrt Linux 2020-12-10 12:15:25 -05:00
make-release make-release: pull in edk2 submodules so we can build it from tarballs 2019-10-07 14:54:45 +02:00
meson.build meson: install scripts/qemu-trace-stap 2020-09-01 01:51:52 -04:00
minikconf.py meson: infrastructure for building emulators 2020-08-21 06:30:17 -04:00
mtest2make.py meson: Re-enable the possibility to run "make check SPEED=slow" 2021-03-09 06:03:53 +01:00
nsis.py meson: Fix argument for makensis (build regression) 2020-11-18 09:28:55 +01:00
qapi-gen.py qapi: move generator entrypoint into package 2020-10-10 11:37:47 +02:00
qemu-binfmt-conf.sh linux-user: manage binfmt-misc preserve-arg[0] flag 2021-03-13 10:45:11 +01:00
qemu-gdb.py scripts/gdb: implement 'qemu bt' 2021-01-12 12:38:03 +01:00
qemu-trace-stap trace: update qemu-trace-stap to Python 3 2020-01-13 16:42:20 +00:00
qemu-version.sh build-sys: fix git version from -version 2020-10-12 11:50:23 -04:00
refresh-pxe-roms.sh
render_block_graph.py python/qmp.py: re-absorb MonitorResponseError 2020-07-14 22:22:22 +02:00
replay-dump.py nomaintainer: Fix Lesser GPL version number 2020-11-15 17:04:40 +01:00
shaderinclude.pl
show-fixed-bugs.sh show-fixed-bugs.sh: Modern shell scripting (use $() instead of ``) 2018-10-16 18:34:19 +02:00
signrom.py drop "from __future__ import print_function" 2020-02-07 15:15:16 +01:00
simpletrace.py simpletrace: build() missing 2 required positional arguments 2021-02-01 10:51:00 +00:00
switch-timer-api
tap-driver.pl scripts: improve message when TAP based tests fail 2020-07-10 19:26:55 -04:00
tap-merge.pl tap: flush STDOUT on newline 2019-02-05 16:50:16 +01:00
test-driver.py mtest2make: hide output of successful tests 2020-09-08 07:17:09 +02:00
tracetool.py tracetool: add output filename command-line argument 2021-01-04 14:24:58 +00:00
u2f-setup-gen.py scripts: Add u2f-setup-gen script 2020-08-31 08:23:39 +02:00
undefsym.py build: fix macOS --enable-modules build 2020-10-22 11:53:52 -04:00
update-linux-headers.sh update-linux-headers: Include const.h 2021-01-21 11:19:45 +01:00
update-mips-syscall-args.sh linux-user,mips: update syscall-args-o32.c.inc 2020-03-20 16:02:00 +01:00
update-syscalltbl.sh linux-user, scripts: add a script to update syscall.tbl 2020-03-20 16:02:00 +01:00
userfaultfd-wrlat.py migration: introduce 'userfaultfd-wrlat.py' script 2021-02-08 11:19:51 +00:00
vmstate-static-checker.py drop "from __future__ import print_function" 2020-02-07 15:15:16 +01:00