diff options
| -rw-r--r-- | pkg/rootless/rootless_linux.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/pkg/rootless/rootless_linux.c b/pkg/rootless/rootless_linux.c index 94933ddd0..9604de638 100644 --- a/pkg/rootless/rootless_linux.c +++ b/pkg/rootless/rootless_linux.c @@ -24,12 +24,16 @@ int renameat2 (int olddirfd, const char *oldpath, int newdirfd, const char *newpath, unsigned int flags) { -# ifdef __NR_renameat2 - return (int) syscall (__NR_renameat2, olddirfd, oldpath, newdirfd, newpath, flags); +# ifdef SYS_renameat2 + return (int) syscall (SYS_renameat2, olddirfd, oldpath, newdirfd, newpath, flags); # else - /* no way to implement it atomically. */ - errno = ENOSYS; - return -1; + /* This might be an issue if another process is trying to read the file while it is empty. */ + int fd = open (newpath, O_EXCL|O_CREAT, 0700); + if (fd < 0) + return fd; + close (fd); + /* We are sure we created the file, let's overwrite it. */ + return rename (oldpath, newpath); # endif } #endif |