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fix parent-memory-clobber in posix_spawn (environ)

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This commit is contained in:
Rich Felker 2012-10-18 16:41:27 -04:00
commit 97c8bdd88a
3 changed files with 17 additions and 9 deletions
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13
src/process/execvp.c
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@ -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);
}