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authorRich Felker <dalias@aerifal.cx>2012-10-18 16:41:27 -0400
committerRich Felker <dalias@aerifal.cx>2012-10-18 16:41:27 -0400
commit97c8bdd88ae2ee03eb9d333a79fa669b3878fc76 (patch)
tree40ef974f6069b9dade949745dcb12e8db1a2ba51 /src/process
parent44eb4d8b9b7b3b539bcd4e311e9d7c8e2acf8d80 (diff)
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fix parent-memory-clobber in posix_spawn (environ)
Diffstat (limited to 'src/process')
-rw-r--r--src/process/execvp.c13
-rw-r--r--src/process/posix_spawn.c7
-rw-r--r--src/process/posix_spawnp.c6
3 files changed, 17 insertions, 9 deletions
diff --git a/src/process/execvp.c b/src/process/execvp.c
index b2da44b9..682680dd 100644
--- 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 e8557487..c3e800b8 100644
--- 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 91355fb8..37360001 100644
--- 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);
}