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Don't modify argument block on MacOS Arm64

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Some dynamic library had access to this information somehow and was
crashing when it didn't have the expected structure.
This commit is contained in:
Justine Tunney 2023-11-12 05:48:18 -08:00
parent 0863427b3a
commit bcf268adf8
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
2 changed files with 19 additions and 18 deletions
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30
ape/ape-m1.c
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@ -937,6 +937,21 @@ int main(int argc, char **argv, char **envp) {
sp = (long *)(argv - 1);
auxv = (long *)(envp + i + 1);
/* create new bottom of stack for spawned program
system v abi aligns this on a 16-byte boundary
grows down the alloc by poking the guard pages */
n = (auxv - sp + AUXV_WORDS + 1) * sizeof(long);
sp2 = (long *)__builtin_alloca(n);
if ((long)sp2 & 15) ++sp2;
for (; n > 0; n -= pagesz) {
((char *)sp2)[n - 1] = 0;
}
memmove(sp2, sp, (auxv - sp) * sizeof(long));
argv = (char **)(sp2 + 1);
envp = (char **)(sp2 + 1 + argc + 1);
auxv = sp2 + (auxv - sp);
sp = sp2;
/* interpret command line arguments */
if ((M->ps.literally = argc >= 3 && !StrCmp(argv[1], "-"))) {
/* if the first argument is a hyphen then we give the user the
@ -959,21 +974,6 @@ int main(int argc, char **argv, char **envp) {
argv = (char **)((sp += 1) + 1);
}
/* create new bottom of stack for spawned program
system v abi aligns this on a 16-byte boundary
grows down the alloc by poking the guard pages */
n = (auxv - sp + AUXV_WORDS + 1) * sizeof(long);
sp2 = (long *)__builtin_alloca(n);
if ((long)sp2 & 15) ++sp2;
for (; n > 0; n -= pagesz) {
((char *)sp2)[n - 1] = 0;
}
memmove(sp2, sp, (auxv - sp) * sizeof(long));
argv = (char **)(sp2 + 1);
envp = (char **)(sp2 + 1 + argc + 1);
auxv = sp2 + (auxv - sp);
sp = sp2;
/* allocate ephemeral memory for reading file */
n = sizeof(union ElfEhdrBuf);
ebuf = (union ElfEhdrBuf *)__builtin_alloca(n);