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Hook execve() and the other exec*() functions.

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Prevents programs from removing our environment variables during the
exec.

Also reduces unnecessary calls to update_environment() by calling it
only once before the exec.
This commit is contained in:
Simon Ruderich
2013-06-05 01:40:56 +02:00
parent a9db9083b6
commit 7ea72c40db
7 changed files with 529 additions and 18 deletions
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36
src/trackfds.h
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@@ -121,19 +121,7 @@ static void init_from_environment(void) {
#endif
}
static void update_environment(void) {
#ifdef DEBUG
debug("update_environment()\t\t[%d]\n", getpid());
#endif
/* An integer (32-bit) has at most 10 digits, + 1 for the comma after each
* number. Bigger file descriptors (which shouldn't occur in reality) are
* skipped. */
char env[tracked_fds_count * (10 + 1) + 1 /* to fit '\0' */ ];
env[0] = 0;
char *x = env;
static void update_environment_buffer(char *x) {
size_t i;
for (i = 0; i < tracked_fds_count; i++) {
int length = snprintf(x, 10 + 1, "%d", tracked_fds[i]);
@@ -148,6 +136,28 @@ static void update_environment(void) {
/* Make sure the string is always zero terminated. */
*x = 0;
}
}
inline static size_t update_environment_buffer_size(void) {
/* An integer (32-bit) has at most 10 digits, + 1 for the comma after each
* number. Bigger file descriptors (which shouldn't occur in reality) are
* skipped. */
return tracked_fds_count * (10 + 1) + 1 /* to fit '\0' */;
}
static void update_environment(void) {
#ifdef DEBUG
debug("update_environment()\t\t[%d]\n", getpid());
#endif
/* If we haven't parsed the environment we also haven't modified it - so
* nothing to do. */
if (!initialized) {
return;
}
char env[update_environment_buffer_size()];
env[0] = 0;
update_environment_buffer(env);
#if 0
debug(" setenv('%s', '%s', 1)\n", ENV_NAME_FDS, env);