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3ef347 |
From ba16223652cfaa656d9c0c2d7bc7ab39dbd12467 Mon Sep 17 00:00:00 2001
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3ef347 |
From: Kamil Dudka <kdudka@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
3ef347 |
Date: Wed, 23 Oct 2013 15:04:22 +0200
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3ef347 |
Subject: [PATCH 1/3] decode: avoid using a static buffer in th_get_pathname()
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
3ef347 |
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
3ef347 |
A solution suggested by Chris Frey:
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3ef347 |
https://lists.feep.net:8080/pipermail/libtar/2013-October/000377.html
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
3ef347 |
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
3ef347 |
Note this can break programs that expect sizeof(TAR) to be fixed.
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
3ef347 |
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3ef347 |
[upstream commit ec613af2e9371d7a3e1f7c7a6822164a4255b4d1]
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
3ef347 |
---
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
3ef347 |
lib/decode.c | 24 +++++++++++++++++-------
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
3ef347 |
lib/handle.c | 1 +
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
3ef347 |
lib/libtar.h | 3 +++
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3ef347 |
3 files changed, 21 insertions(+), 7 deletions(-)
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3ef347 |
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3ef347 |
diff --git a/lib/decode.c b/lib/decode.c
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3ef347 |
index c16ea2d..edb2185 100644
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3ef347 |
--- a/lib/decode.c
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3ef347 |
+++ b/lib/decode.c
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3ef347 |
@@ -26,20 +26,30 @@
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3ef347 |
char *
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3ef347 |
th_get_pathname(TAR *t)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
3ef347 |
{
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
3ef347 |
- static TLS_THREAD char filename[MAXPATHLEN];
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3ef347 |
-
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3ef347 |
if (t->th_buf.gnu_longname)
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3ef347 |
return t->th_buf.gnu_longname;
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3ef347 |
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3ef347 |
- if (t->th_buf.prefix[0] != '\0')
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3ef347 |
+ /* allocate the th_pathname buffer if not already */
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
3ef347 |
+ if (t->th_pathname == NULL)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
3ef347 |
+ {
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
3ef347 |
+ t->th_pathname = malloc(MAXPATHLEN * sizeof(char));
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
3ef347 |
+ if (t->th_pathname == NULL)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
3ef347 |
+ /* out of memory */
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3ef347 |
+ return NULL;
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3ef347 |
+ }
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3ef347 |
+
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3ef347 |
+ if (t->th_buf.prefix[0] == '\0')
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
3ef347 |
+ {
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
3ef347 |
+ snprintf(t->th_pathname, MAXPATHLEN, "%.100s", t->th_buf.name);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
3ef347 |
+ }
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
3ef347 |
+ else
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3ef347 |
{
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3ef347 |
- snprintf(filename, sizeof(filename), "%.155s/%.100s",
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3ef347 |
+ snprintf(t->th_pathname, MAXPATHLEN, "%.155s/%.100s",
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3ef347 |
t->th_buf.prefix, t->th_buf.name);
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3ef347 |
- return filename;
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3ef347 |
}
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3ef347 |
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3ef347 |
- snprintf(filename, sizeof(filename), "%.100s", t->th_buf.name);
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3ef347 |
- return filename;
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3ef347 |
+ /* will be deallocated in tar_close() */
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3ef347 |
+ return t->th_pathname;
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3ef347 |
}
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3ef347 |
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3ef347 |
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3ef347 |
diff --git a/lib/handle.c b/lib/handle.c
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3ef347 |
index 002d23c..a19c046 100644
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3ef347 |
--- a/lib/handle.c
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3ef347 |
+++ b/lib/handle.c
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3ef347 |
@@ -122,6 +122,7 @@ tar_close(TAR *t)
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3ef347 |
libtar_hash_free(t->h, ((t->oflags & O_ACCMODE) == O_RDONLY
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3ef347 |
? free
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3ef347 |
: (libtar_freefunc_t)tar_dev_free));
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3ef347 |
+ free(t->th_pathname);
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3ef347 |
free(t);
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3ef347 |
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3ef347 |
return i;
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3ef347 |
diff --git a/lib/libtar.h b/lib/libtar.h
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3ef347 |
index 7fc4d03..08a8e0f 100644
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3ef347 |
--- a/lib/libtar.h
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3ef347 |
+++ b/lib/libtar.h
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3ef347 |
@@ -85,6 +85,9 @@ typedef struct
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3ef347 |
int options;
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3ef347 |
struct tar_header th_buf;
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3ef347 |
libtar_hash_t *h;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
3ef347 |
+
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3ef347 |
+ /* introduced in libtar 1.2.21 */
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3ef347 |
+ char *th_pathname;
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3ef347 |
}
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3ef347 |
TAR;
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3ef347 |
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3ef347 |
--
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3ef347 |
1.7.1
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3ef347 |
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3ef347 |
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
3ef347 |
From 8ef92e48bba35d60208cc09be2bab74f69273d15 Mon Sep 17 00:00:00 2001
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
3ef347 |
From: Chris Frey <cdfrey@foursquare.net>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
3ef347 |
Date: Thu, 24 Oct 2013 17:55:12 -0400
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3ef347 |
Subject: [PATCH 2/3] Check for NULL before freeing th_pathname
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
3ef347 |
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
3ef347 |
Thanks to Harald Koch for pointing out that AIX 4 and 5 still need this.
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[upstream commit 495d0c0eabc5648186e7d58ad54b508d14af38f4]
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Signed-off-by: Kamil Dudka <kdudka@redhat.com>
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---
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lib/handle.c | 3 ++-
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1 files changed, 2 insertions(+), 1 deletions(-)
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diff --git a/lib/handle.c b/lib/handle.c
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index a19c046..28a7dc2 100644
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--- a/lib/handle.c
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+++ b/lib/handle.c
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@@ -122,7 +122,8 @@ tar_close(TAR *t)
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libtar_hash_free(t->h, ((t->oflags & O_ACCMODE) == O_RDONLY
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? free
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: (libtar_freefunc_t)tar_dev_free));
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- free(t->th_pathname);
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+ if (t->th_pathname != NULL)
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+ free(t->th_pathname);
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free(t);
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return i;
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--
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1.7.1
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From 71101392dbab09718d38fabd151bb3cf22fc8b80 Mon Sep 17 00:00:00 2001
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From: Chris Frey <cdfrey@foursquare.net>
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Date: Thu, 24 Oct 2013 17:58:47 -0400
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Subject: [PATCH 3/3] Added stdlib.h for malloc() in lib/decode.c
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[upstream commit 20aa09bd7775094a2beb0f136c2c7d9e9fd6c7e6]
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Signed-off-by: Kamil Dudka <kdudka@redhat.com>
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---
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lib/decode.c | 1 +
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1 files changed, 1 insertions(+), 0 deletions(-)
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diff --git a/lib/decode.c b/lib/decode.c
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index edb2185..35312be 100644
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--- a/lib/decode.c
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+++ b/lib/decode.c
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@@ -13,6 +13,7 @@
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#include <internal.h>
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#include <stdio.h>
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+#include <stdlib.h>
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#include <sys/param.h>
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#include <pwd.h>
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#include <grp.h>
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--
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1.7.1
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