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[WRAPPER] Used a private envp copy for BOX64/86_ARG0 in posix_spawn #4225

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Merged
ptitSeb merged 1 commit into from
Aug 10, 2026
+40 −6
Merged

[WRAPPER] Used a private envp copy for BOX64/86_ARG0 in posix_spawn #4225

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46 changes: 40 additions & 6 deletions src/wrapped/wrappedlibc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3193,6 +3193,30 @@ EXPORT int32_t my_execlp(x64emu_t* emu, const char* path)
return my_execvp(emu, path, argv);
}

static char** spawn_env_with_arg0(char* const envp[], const char* name, const char* arg0, char** added)
{
size_t n = 0;
size_t replace = (size_t)-1;
size_t name_len = strlen(name);

while (envp && envp[n]) {
if (!strncmp(envp[n], name, name_len) && envp[n][name_len] == '=')
replace = n;
++n;
}

char** ret = (char**)box_calloc(n + (replace == (size_t)-1 ? 2 : 1), sizeof(char*));
if (n)
memcpy(ret, envp, n * sizeof(char*));
*added = (char*)box_malloc(name_len + strlen(arg0) + 2);
sprintf(*added, "%s=%s", name, arg0);
if (replace == (size_t)-1)
ret[n] = *added;
else
ret[replace] = *added;
return ret;
}

EXPORT int32_t my_posix_spawn(x64emu_t* emu, pid_t* pid, const char* fullpath,
const posix_spawn_file_actions_t *actions, const posix_spawnattr_t* attrp, char* const argv[], char* const envp[])
{
Expand All @@ -3217,15 +3241,20 @@ EXPORT int32_t my_posix_spawn(x64emu_t* emu, pid_t* pid, const char* fullpath,
if(script) newargv[1] = emu->context->bashpath; // script needs to be launched with bash
if(python) newargv[1] = emu->context->pythonpath; // python scripts need box64-python
memcpy(newargv+toadd, argv, (n+1)*sizeof(char*));
char** spawn_envp = (char**)envp;
char* arg0_env = NULL;
if(self) newargv[toadd] = emu->context->fullpath;
else {
// TODO check if envp is not environ and add the value on a copy
if(strcmp(newargv[toadd], fullpath))
setenv(x86?"BOX86_ARG0":"BOX64_ARG0", newargv[toadd], 1);
spawn_envp = spawn_env_with_arg0(envp, x86?"BOX86_ARG0":"BOX64_ARG0", newargv[toadd], &arg0_env);
newargv[toadd] = fullpath;
}
printf_log(/*LOG_DEBUG*/LOG_INFO, " => posix_spawn(%p, \"%s\", %p, %p, %p [\"%s\", \"%s\", \"%s\"...:%d], %p)\n", pid, newargv[0], actions, attrp, newargv, newargv[0], newargv[1], newargv[2]?newargv[2]:"", n, envp);
ret = posix_spawn(pid, newargv[0], actions, attrp, (char* const*)newargv, envp);
ret = posix_spawn(pid, newargv[0], actions, attrp, (char* const*)newargv, spawn_envp);
if (spawn_envp != envp) {
box_free(arg0_env);
box_free(spawn_envp);
}
printf_log(/*LOG_DEBUG*/LOG_INFO, "posix_spawn returned %d\n", ret);
//box_free(newargv);
} else
Expand Down Expand Up @@ -3261,15 +3290,20 @@ EXPORT int32_t my_posix_spawnp(x64emu_t* emu, pid_t* pid, const char* path,
if(script) newargv[1] = emu->context->bashpath; // script needs to be launched with bash
if(python) newargv[1] = emu->context->pythonpath; // python scripts need box64-python
memcpy(newargv+toadd, argv, (n+1)*sizeof(char*));
char** spawn_envp = (char**)envp;
char* arg0_env = NULL;
if(self) newargv[toadd] = emu->context->fullpath;
else {
// TODO check if envp is not environ and add the value on a copy
if(strcmp(newargv[toadd], fullpath))
setenv(x86?"BOX86_ARG0":"BOX64_ARG0", newargv[toadd], 1);
spawn_envp = spawn_env_with_arg0(envp, x86?"BOX86_ARG0":"BOX64_ARG0", newargv[toadd], &arg0_env);
newargv[toadd] = fullpath;
}
printf_log(/*LOG_DEBUG*/LOG_INFO, " => posix_spawn(%p, \"%s\", %p, %p, %p [\"%s\", \"%s\", \"%s\"...:%d], %p)\n", pid, newargv[0], actions, attrp, newargv, newargv[0], newargv[1], newargv[2]?newargv[2]:"", n, envp);
ret = posix_spawn(pid, newargv[0], actions, attrp, (char* const*)newargv, envp);
ret = posix_spawn(pid, newargv[0], actions, attrp, (char* const*)newargv, spawn_envp);
if (spawn_envp != envp) {
box_free(arg0_env);
box_free(spawn_envp);
}
printf_log(/*LOG_DEBUG*/LOG_INFO, "posix_spawn returned %d\n", ret);
//box_free(newargv);
} else
Expand Down
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