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Fix env overflow

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Fix #5989
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LoveSy 2022-06-17 17:02:44 +08:00 committed by GitHub
parent 6e5df1f06b
commit 4e2ecdb920
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1 changed files with 6 additions and 7 deletions
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13
native/jni/su/su_daemon.cpp
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@ -415,14 +415,13 @@ void su_daemon_handler(int client, const sock_cred *cred) {
if (realpath(path, cwd)) if (realpath(path, cwd))
chdir(cwd); chdir(cwd);
snprintf(path, sizeof(path), "/proc/%d/environ", ctx.pid); snprintf(path, sizeof(path), "/proc/%d/environ", ctx.pid);
char buf[4096] = { 0 }; auto env = full_read(path);
int fd = xopen(path, O_RDONLY);
read(fd, buf, sizeof(buf));
close(fd);
clearenv(); clearenv();
for (size_t pos = 0; buf[pos];) { for (size_t pos = 0; pos < env.size(); ++pos) {
putenv(buf + pos); putenv(env.data() + pos);
pos += strlen(buf + pos) + 1; pos = env.find_first_of('\0', pos);
if (pos == std::string::npos)
break;
} }
if (!ctx.req.keepenv) { if (!ctx.req.keepenv) {
struct passwd *pw; struct passwd *pw;