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libbb: add bb_unsetenv (taken from hush).

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udhcpc: stop filtering environment passed to the script.
crond: fix uncovered potential bug (failing unsetenv)
mdev: fix uncovered potential bug (failing unsetenv)
tcp, udpsvd: fix uncovered potential bug (failing unsetenv)

function                                             old     new   delta
safe_setenv                                            -      58     +58
bb_unsetenv                                            -      55     +55
builtin_unset                                        139     138      -1
tcpudpsvd_main                                      1843    1830     -13
free_strings_and_unsetenv                             87      53     -34
udhcp_run_script                                    1186    1133     -53
safe_setenv4                                          62       -     -62
------------------------------------------------------------------------------
(add/remove: 2/1 grow/shrink: 0/4 up/down: 113/-163)          Total: -50 bytes
This commit is contained in:
Denis Vlasenko
2008-12-30 05:05:31 +00:00
parent d6e8f9450c
commit 76ddc2e3e4
7 changed files with 65 additions and 57 deletions
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12
miscutils/crond.c
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@@ -252,14 +252,12 @@ int crond_main(int argc UNUSED_PARAM, char **argv)
/* We set environment *before* vfork (because we want to use vfork),
* so we cannot use setenv() - repeated calls to setenv() may leak memory!
* Using putenv(), and freeing memory after unsetenv() won't leak */
static void safe_setenv4(char **pvar_val, const char *var, const char *val /*, int len*/)
static void safe_setenv(char **pvar_val, const char *var, const char *val)
{
const int len = 4; /* both var names are 4 char long */
char *var_val = *pvar_val;
if (var_val) {
var_val[len] = '\0'; /* nuke '=' */
unsetenv(var_val);
bb_unsetenv(var_val);
free(var_val);
}
*pvar_val = xasprintf("%s=%s", var, val);
@@ -270,10 +268,10 @@ static void safe_setenv4(char **pvar_val, const char *var, const char *val /*, i
static void SetEnv(struct passwd *pas)
{
#if SETENV_LEAKS
safe_setenv4(&env_var_user, "USER", pas->pw_name);
safe_setenv4(&env_var_home, "HOME", pas->pw_dir);
safe_setenv(&env_var_user, "USER", pas->pw_name);
safe_setenv(&env_var_home, "HOME", pas->pw_dir);
/* if we want to set user's shell instead: */
/*safe_setenv(env_var_user, "SHELL", pas->pw_shell, 5);*/
/*safe_setenv(env_var_user, "SHELL", pas->pw_shell);*/
#else
xsetenv("USER", pas->pw_name);
xsetenv("HOME", pas->pw_dir);