Hi Krzysztof,
Sorry for the long delay in responding.
Krzysztof A. Sobiecki wrote:
[...]
> +++ dash-0.5.6.1/src/input.c 2010-06-25 00:45:19.000000000 +0200
> @@ -400,15 +402,28 @@ popstring(void)
> */
>
> int
> +isdir(const char *name)
> +{
> + struct stat64 st;
> + if (stat64(name, &st) < 0)
> + return -1;
> + if (S_ISDIR(st.st_mode)) {
> + return -1;
> + }
> + return 0;
> +}
This function does not distinguish between failures where errno is set
and where it is not...
> +
> +int
> setinputfile(const char *fname, int flags)
> {
> int fd;
>
> INTOFF;
> - if ((fd = open(fname, O_RDONLY)) < 0) {
> + if ((isdir(fname) < 0) || ((fd = open(fname, O_RDONLY)) < 0)) {
> if (flags & INPUT_NOFILE_OK)
> goto out;
> - sh_error("Can't open %s", fname);
> + exitstatus = 127;
> + exerror(EXIFILE, "Can't open %s", fname);
... so the caller unconditionally suppresses errno.
The isdir() check happens before the open(), leading to unpleasant
behavior if a file is replaced by a directory between them.
The patch fixes two issues at once: changing the exit status to 127
and catching attempts to redirect from a directory.
That said, do you think this could be made into two patches against
upstream to be sent to <d...@vger.kernel.org>?
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