fix rejection of dns responses with pointers past 512 byte offset

[musl] / src / process / execvp.c

diff --git a/src/process/execvp.c b/src/process/execvp.c
index 0a33e42..ef3b9dd 100644 (file)
--- a/src/process/execvp.c
+++ b/src/process/execvp.c
@@ -10,6 +10,7 @@ int __execvpe(const char *file, char *const argv[], char *const envp[])
 {
        const char *p, *z, *path = getenv("PATH");
        size_t l, k;
+       int seen_eacces = 0;
 
        errno = ENOENT;
        if (!*file) return -1;
@@ -27,8 +28,7 @@ int __execvpe(const char *file, char *const argv[], char *const envp[])
 
        for(p=path; ; p=z) {
                char b[l+k+1];
-               z = strchr(p, ':');
-               if (!z) z = p+strlen(p);
+               z = __strchrnul(p, ':');
                if (z-p >= l) {
                        if (!*z++) break;
                        continue;
@@ -37,9 +37,18 @@ int __execvpe(const char *file, char *const argv[], char *const envp[])
                b[z-p] = '/';
                memcpy(b+(z-p)+(z>p), file, k+1);
                execve(b, argv, envp);
-               if (errno != ENOENT) return -1;
+               switch (errno) {
+               case EACCES:
+                       seen_eacces = 1;
+               case ENOENT:
+               case ENOTDIR:
+                       break;
+               default:
+                       return -1;
+               }
                if (!*z++) break;
        }
+       if (seen_eacces) errno = EACCES;
        return -1;
 }
 
@@ -47,3 +56,5 @@ int execvp(const char *file, char *const argv[])
 {
        return __execvpe(file, argv, __environ);
 }
+
+weak_alias(__execvpe, execvpe);