Hi!
On Sat, 2011-10-15 at 15:51:11 +0200, Svante Signell wrote:
> On Sat, 2011-10-15 at 01:20 +0200, Guillem Jover wrote:
> > After considering this, I think it would be a better option and way more
> > portable to use realpath(path, NULL) when _POSIX_VERSION >= 200809L.
>
> Attached is an updated patch, taking Guillems comments into
> consideration. We are looking forward to se it applied in the next
> Debian release of pax (and in upstream in due time).
> diff -ur pax-20090728/file_subs.c pax-20090728.modified/file_subs.c
> --- pax-20090728/file_subs.c 2009-07-28 17:38:28.000000000 +0000
> +++ pax-20090728.modified/file_subs.c 2011-10-15 12:56:46.000000000 +0000
> @@ -374,8 +374,15 @@
> if (strcmp(NM_TAR, argv0) == 0 && Lflag) {
> while (lstat(nm, &sb) == 0 &&
> S_ISLNK(sb.st_mode)) {
> + target = malloc(sb.st_size + 1);
> + if (target == NULL) {
> + oerrno = ENOMEM;
> + syswarn(1, oerrno,
> + "Insufficient memory");
> + return(-1);
> + }
> len = readlink(nm, target,
> - sizeof target - 1);
> + sb.st_size);
It might make sense to use sb.st_size + 1 and verify there's not been
truncation in between, please see the example code at:
<http://man7.org/linux/man-pages/online/pages/man2/readlink.2.html>
> if (len == -1) {
> syswarn(0, errno,
> "cannot follow symlink %s in
> chain for %s",
> diff -ur pax-20090728/tables.c pax-20090728.modified/tables.c
> --- pax-20090728/tables.c 2009-07-28 17:38:28.000000000 +0000
> +++ pax-20090728.modified/tables.c 2011-10-15 13:39:29.000000000 +0000
> @@ -55,6 +55,7 @@
> #include "pax.h"
> #include "tables.h"
> #include "extern.h"
> +#include "features.h"
>
> /*
> * Routines for controlling the contents of all the different databases pax
> @@ -1126,13 +1127,21 @@
> add_dir(char *name, struct stat *psb, int frc_mode)
> {
> DIRDATA *dblk;
> +#if (_POSIX_C_SOURCE - 0) >= 200809L
> + char *rp = NULL;
> +#else
> char realname[MAXPATHLEN], *rp;
> +#endif
Unfortunately both "features.h" and _POSIX_C_SOURCE are non-portable.
The latter is a user defined variable, it does not specify what the
system supports, but what the user requests, also both are GNUisms.
The correct way to check for this is to include <unistd.h> and check
for _POSIX_VERSION, as I pointed out initially. More into at:
<http://sourceforge.net/apps/mediawiki/predef/index.php?title=Standards>
thanks,
guillem
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