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Avoid APE fork bomb

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This change addresses a $PATH resolution issue where APE depends on
uname and uname is an APE program. So sorry to anyone this impacted
we'll get a release out soon.
This commit is contained in:
Justine Tunney 2023-11-08 11:34:10 -08:00
parent cc3e3de044
commit 5330442d85
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GPG key ID: BE714B4575D6E328
2 changed files with 27 additions and 24 deletions
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24
ape/ape.S
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@ -592,7 +592,8 @@ ape_disk:
#ifdef APE_IS_SHELL_SCRIPT
apesh: .ascii "\n@\n#'\"\n" // sixth edition shebang
.ascii "m=\"$(uname -m)\"\n"
.ascii "m=\"$(/bin/uname -m >/dev/null)\" || "
.ascii "m=\"$(/usr/bin/uname -m)\"\n"
.ascii "if [ \"$m\" = x86_64 ] || [ \"$m\" = amd64 ]; then\n"
// Until all operating systems can be updated to support APE,
@ -615,15 +616,15 @@ apesh: .ascii "\n@\n#'\"\n" // sixth edition shebang
.ascii APE_VERSION_STR
.ascii "\"\n"
.ascii "[ -x \"$t\" ] || {\n"
.ascii "mkdir -p \"${t%/*}\" &&\n"
.ascii "dd if=\"$o\" of=\"$t.$$\" skip="
.ascii "/bin/mkdir -p \"${t%/*}\" &&\n"
.ascii "/bin/dd if=\"$o\" of=\"$t.$$\" skip="
.shstub ape_loader_dd_skip,2
.ascii " count="
.shstub ape_loader_dd_count,2
.ascii " bs=64 2>/dev/null\n"
#if SupportsXnu()
.ascii "[ -d /Applications ] && "
.ascii "dd if=\"$t.$$\""
.ascii "/bin/dd if=\"$t.$$\""
.ascii " of=\"$t.$$\""
.ascii " skip=5"
.ascii " count=8"
@ -631,8 +632,8 @@ apesh: .ascii "\n@\n#'\"\n" // sixth edition shebang
.ascii " conv=notrunc"
.ascii " 2>/dev/null\n"
#endif /* SupportsXnu() */
.ascii "chmod 755 \"$t.$$\"\n"
.ascii "mv -f \"$t.$$\" \"$t\"\n"
.ascii "/bin/chmod 755 \"$t.$$\"\n"
.ascii "/bin/mv -f \"$t.$$\" \"$t\"\n"
.ascii "}\n"
.ascii "exec \"$t\" \"$o\" \"$@\"\n"
.ascii "}\n"
@ -648,9 +649,9 @@ apesh: .ascii "\n@\n#'\"\n" // sixth edition shebang
.ascii "t=\"${TMPDIR:-${HOME:-.}}/$0\"\n"
.ascii "[ x\"$1\" != x--assimilate ] || [ ! -e \"$t\" ] && {\n"
.ascii "[ x\"$1\" != x--assimilate ] && {\n"
.ascii "mkdir -p \"${t%/*}\" 2>/dev/null\n"
.ascii "cp -f \"$o\" \"$t.$$\" &&\n"
.ascii "mv -f \"$t.$$\" \"$t\" || exit 120\n"
.ascii "/bin/mkdir -p \"${t%/*}\" 2>/dev/null\n"
.ascii "/bin/cp -f \"$o\" \"$t.$$\" &&\n"
.ascii "/bin/mv -f \"$t.$$\" \"$t\" || exit 120\n"
.ascii "o=\"$t\"\n"
.ascii "}\n"
#endif /* APE_NO_MODIFY_SELF */
@ -681,7 +682,7 @@ apesh: .ascii "\n@\n#'\"\n" // sixth edition shebang
.ascii "exec 7<&-\n"
#if SupportsXnu()
.ascii "[ -d /Applications ] && "
.ascii "dd if=\"$o\""
.ascii "/bin/dd if=\"$o\""
.ascii " of=\"$o\""
.ascii " bs=8"
.ascii " skip="
@ -710,7 +711,8 @@ apesh: .ascii "\n@\n#'\"\n" // sixth edition shebang
// because they need to be in the first 4096 bytes
.section .emushprologue,"a",@progbits
emush: .ascii "\n@\n#'\"\n"
.ascii "s=\"$(uname -s)\"\n"
.ascii "s=\"$(/bin/uname -s >/dev/null)\" || "
.ascii "s=\"$(/usr/bin/uname -s)\"\n"
// our script is running on a non-x86_64 architecture
// 1. `dd` out the appropriate blink vm blob
// 2. gunzip the blink virtual machine executable