fix parent-memory-clobber in posix_spawn (environ)

diff --git a/src/process/execvp.c b/src/process/execvp.c
index b2da44b92cc134918d510e7d7b06504014c1c902..682680dd478d39f21f0d3f1922dd67876ce8f279 100644 (file)
--- a/src/process/execvp.c
+++ b/src/process/execvp.c
@@ -4,7 +4,9 @@
 #include <errno.h>
 #include <limits.h>
 
-int execvp(const char *file, char *const argv[])
+extern char **environ;
+
+int __execvpe(const char *file, char *const argv[], char *const envp[])
 {
        const char *p, *z, *path = getenv("PATH");
        size_t l, k;
@@ -13,7 +15,7 @@ int execvp(const char *file, char *const argv[])
        if (!*file) return -1;
 
        if (strchr(file, '/'))
-               return execv(file, argv);
+               return execve(file, argv, envp);
 
        if (!path) path = "/usr/local/bin:/bin:/usr/bin";
        k = strnlen(file, NAME_MAX+1);
@@ -34,9 +36,14 @@ int execvp(const char *file, char *const argv[])
                memcpy(b, p, z-p);
                b[z-p] = '/';
                memcpy(b+(z-p)+(z>p), file, k+1);
-               execv(b, argv);
+               execve(b, argv, envp);
                if (errno != ENOENT) return -1;
                if (!*z++) break;
        }
        return -1;
 }
+
+int execvp(const char *file, char *const argv[])
+{
+       return __execvpe(file, argv, environ);
+}

diff --git a/src/process/posix_spawn.c b/src/process/posix_spawn.c
index e8557487354c219f290eca3882e10f2d5b7f3eda..c3e800b879553627daef047bae08bea4313d95ea 100644 (file)
--- a/src/process/posix_spawn.c
+++ b/src/process/posix_spawn.c
@@ -19,7 +19,7 @@ weak_alias(dummy_0, __release_ptc);
 pid_t __vfork(void);
 
 int __posix_spawnx(pid_t *restrict res, const char *restrict path,
-       int (*exec)(const char *, char *const *),
+       int (*exec)(const char *, char *const *, char *const *),
        const posix_spawn_file_actions_t *fa,
        const posix_spawnattr_t *restrict attr,
        char *const argv[restrict], char *const envp[restrict])
@@ -95,8 +95,7 @@ int __posix_spawnx(pid_t *restrict res, const char *restrict path,
        sigprocmask(SIG_SETMASK, (attr->__flags & POSIX_SPAWN_SETSIGMASK)
                ? &attr->__mask : &oldmask, 0);
 
-       if (envp) environ = (char **)envp;
-       exec(path, argv);
+       exec(path, argv, envp ? envp : environ);
        _exit(127);
 
        return 0;
@@ -107,5 +106,5 @@ int posix_spawn(pid_t *restrict res, const char *restrict path,
        const posix_spawnattr_t *restrict attr,
        char *const argv[restrict], char *const envp[restrict])
 {
-       return __posix_spawnx(res, path, execv, fa, attr, argv, envp);
+       return __posix_spawnx(res, path, execve, fa, attr, argv, envp);
 }

diff --git a/src/process/posix_spawnp.c b/src/process/posix_spawnp.c
index 91355fb82f7e843cf7e648bf33d301e8763d0618..37360001d24bd9ce02ff615a775283a97fb56525 100644 (file)
--- a/src/process/posix_spawnp.c
+++ b/src/process/posix_spawnp.c
@@ -1,8 +1,10 @@
 #include <spawn.h>
 #include <unistd.h>
 
+int __execvpe(const char *, char *const *, char *const *);
+
 int __posix_spawnx(pid_t *restrict, const char *restrict,
-       int (*)(const char *, char *const *),
+       int (*)(const char *, char *const *, char *const *),
        const posix_spawn_file_actions_t *,
        const posix_spawnattr_t *restrict, char *const *restrict, char *const *restrict);
 
@@ -11,5 +13,5 @@ int posix_spawnp(pid_t *restrict res, const char *restrict file,
        const posix_spawnattr_t *restrict attr,
        char *const argv[restrict], char *const envp[restrict])
 {
-       return __posix_spawnx(res, file, execvp, fa, attr, argv, envp);
+       return __posix_spawnx(res, file, __execvpe, fa, attr, argv, envp);
 }