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Date: Thu, 8 Jun 2017 22:15:55 +0200
From: Szabolcs Nagy <nsz@...t70.net>
To: musl@...ts.openwall.com
Subject: Re: tmpfile patch
* Petr Skočík <pskocik@...il.com> [2017-06-08 20:01:53 +0200]:
> Hi,
> I made a patch to tmpfile() to make it signal-proof and use
> O_TMPFILE if it can.
>
> Best Regards,
> Petr Skocik
> diff --git a/src/stdio/tmpfile.c b/src/stdio/tmpfile.c
> index 525090aa..34c3d487 100644
> --- a/src/stdio/tmpfile.c
> +++ b/src/stdio/tmpfile.c
> @@ -1,6 +1,7 @@
> #include <stdio.h>
> #include <fcntl.h>
> #include "stdio_impl.h"
> +#include "pthread_impl.h"
>
> #define MAXTRIES 100
>
> @@ -8,10 +9,23 @@ char *__randname(char *);
>
> FILE *tmpfile(void)
> {
> +#ifdef O_TMPFILE
i don't think this ifdef helps,
kernel support for O_TMPFILE can
only be detected at runtime,
you will get ENOSYS on an old kernel.
> + int fd;
> + FILE *f = 0;
> + fd = sys_open("/tmp", O_RDWR|O_TMPFILE);
> + if (fd >= 0) {
> + f = __fdopen(fd, "w+");
> + if (!f) __syscall(SYS_close, fd);
> + }
> + return f;
> +#else
> char s[] = "/tmp/tmpfile_XXXXXX";
> + FILE *f = 0;
> int fd;
> - FILE *f;
> int try;
> + sigset_t saved_mask;
> +
> + pthread_sigmask(SIG_SETMASK, SIGALL_SET, &saved_mask);
> for (try=0; try<MAXTRIES; try++) {
> __randname(s+13);
> fd = sys_open(s, O_RDWR|O_CREAT|O_EXCL, 0600);
> @@ -21,12 +35,15 @@ FILE *tmpfile(void)
> #else
> __syscall(SYS_unlinkat, AT_FDCWD, s, 0);
> #endif
> + pthread_sigmask(SIG_SETMASK, &saved_mask, 0);
> f = __fdopen(fd, "w+");
> if (!f) __syscall(SYS_close, fd);
> return f;
> }
> }
> + pthread_sigmask(SIG_SETMASK, &saved_mask, 0);
> return 0;
> +#endif /*O_TMPFILE*/
> }
>
> LFS64(tmpfile);
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