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Introduce new jartsr=' ape prefix

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Files beginning with "MZqFpD" are Actually Portable Executables,
which have a printf statement in the first 4096 bytes with octal
codes that specify the ELF header. APE also specifies `jartsr='`
as an alternative prefix, intended for binaries that do not want
to be identified as Windows executables. Like the \177ELF magic,
all these prefixes decode as x86 jump instructions that could be
used for 16-bit bootloaders or 32-bit / 64-bit flat executables.
Most importantly they provide a fallback path for Thompson shell
copmatible command interpreters, which do not require a shebang,
e.g. bash, zsh, fish, bourne, almquist, etc. Please note that in
order to meet the requirements of POSIX.1, the single quote must
be followed by a newline character, before any null bytes occur.
See also: https://www.austingroupbugs.net/view.php?id=1250
This commit is contained in:
Justine Tunney 2022-11-10 20:58:48 -08:00
parent cee6871710
commit b46ac13504
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
3 changed files with 34 additions and 15 deletions
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18
ape/apeuninstall.sh
View file

@ -8,21 +8,19 @@ fi
{
echo
echo "APE Uninstaller intends to run"
echo "APE Uninstaller intends to run (in pseudo-shell)"
echo
echo " $SUDO sh -c 'echo -1 >/proc/sys/fs/binfmt_misc/APE'"
echo " $SUDO sh -c 'echo -1 >/proc/sys/fs/binfmt_misc/APE-sysv'"
echo " $SUDO rm -f /usr/bin/ape ~/.ape o/tmp/.ape /tmp/.ape"
echo " sudo echo -1 into /proc/sys/fs/binfmt_misc/APE*"
echo " sudo rm -f /usr/bin/ape ~/.ape o/tmp/.ape /tmp/.ape"
echo
echo "You may then use ape/apeinstall.sh to reinstall it"
echo
} >&2
set -ex
if [ -f /proc/sys/fs/binfmt_misc/APE ]; then
$SUDO sh -c 'echo -1 >/proc/sys/fs/binfmt_misc/APE' || exit
fi
if [ -f /proc/sys/fs/binfmt_misc/APE-sysv ]; then
$SUDO sh -c 'echo -1 >/proc/sys/fs/binfmt_misc/APE-sysv' || exit
fi
for f in /proc/sys/fs/binfmt_misc/APE*; do
if [ -f $f ]; then
$SUDO sh -c "echo -1 >$f" || exit
fi
done
$SUDO rm -f /usr/bin/ape ~/.ape o/tmp/.ape o/tmp/ape /tmp/.ape /tmp/ape || exit