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authorYuanjie Huang <yuanjie.huang@windriver.com>2016-08-26 09:57:33 +0800
committerRichard Purdie <richard.purdie@linuxfoundation.org>2016-09-20 15:10:36 +0100
commit2ce02941300aa3e826df0c59fd8d4ce19950028e (patch)
treebd2697f0ae74ed16ed96c269f4a68fcbaa00def8
parentc687c9fcc010947f52e1cd153ea74ae5f6343ca4 (diff)
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openssh: fix potential signed overflow to enable compilation with -ftrapv
Pointer arithmatic results in implementation defined signed integer type, so that 's - src' in strlcpy and others may trigger signed overflow. In case of compilation by gcc or clang with -ftrapv option, the overflow would lead to program abort. Upstream-status: Submitted [https://bugzilla.mindrot.org/show_bug.cgi?id=2608] Signed-off-by: Yuanjie Huang <yuanjie.huang@windriver.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
-rw-r--r--meta/recipes-connectivity/openssh/openssh/fix-potential-signed-overflow-in-pointer-arithmatic.patch99
-rw-r--r--meta/recipes-connectivity/openssh/openssh_7.3p1.bb1
2 files changed, 100 insertions, 0 deletions
diff --git a/meta/recipes-connectivity/openssh/openssh/fix-potential-signed-overflow-in-pointer-arithmatic.patch b/meta/recipes-connectivity/openssh/openssh/fix-potential-signed-overflow-in-pointer-arithmatic.patch
new file mode 100644
index 00000000000..df64a140d32
--- /dev/null
+++ b/meta/recipes-connectivity/openssh/openssh/fix-potential-signed-overflow-in-pointer-arithmatic.patch
@@ -0,0 +1,99 @@
+From 3328e98bcbf2930cd7eea3e6c92ad5dcbdf4794f Mon Sep 17 00:00:00 2001
+From: Yuanjie Huang <yuanjie.huang@windriver.com>
+Date: Wed, 24 Aug 2016 03:15:43 +0000
+Subject: [PATCH] Fix potential signed overflow in pointer arithmatic
+
+Pointer arithmatic results in implementation defined signed integer
+type, so that 's - src' in strlcpy and others may trigger signed overflow.
+In case of compilation by gcc or clang with -ftrapv option, the overflow
+would lead to program abort.
+
+Upstream-status: Submitted [http://bugzilla.mindrot.org/show_bug.cgi?id=2608]
+
+Signed-off-by: Yuanjie Huang <yuanjie.huang@windriver.com>
+---
+ openbsd-compat/strlcat.c | 8 ++++++--
+ openbsd-compat/strlcpy.c | 8 ++++++--
+ openbsd-compat/strnlen.c | 8 ++++++--
+ 3 files changed, 18 insertions(+), 6 deletions(-)
+
+diff --git a/openbsd-compat/strlcat.c b/openbsd-compat/strlcat.c
+index bcc1b61..e758ebf 100644
+--- a/openbsd-compat/strlcat.c
++++ b/openbsd-compat/strlcat.c
+@@ -23,6 +23,7 @@
+
+ #include <sys/types.h>
+ #include <string.h>
++#include <stdint.h>
+
+ /*
+ * Appends src to string dst of size siz (unlike strncat, siz is the
+@@ -55,8 +56,11 @@ strlcat(char *dst, const char *src, size_t siz)
+ s++;
+ }
+ *d = '\0';
+-
+- return(dlen + (s - src)); /* count does not include NUL */
++ /*
++ * Cast pointers to unsigned type before calculation, to avoid signed
++ * overflow when the string ends where the MSB has changed.
++ */
++ return (dlen + ((uintptr_t)s - (uintptr_t)src)); /* count does not include NUL */
+ }
+
+ #endif /* !HAVE_STRLCAT */
+diff --git a/openbsd-compat/strlcpy.c b/openbsd-compat/strlcpy.c
+index b4b1b60..b06f374 100644
+--- a/openbsd-compat/strlcpy.c
++++ b/openbsd-compat/strlcpy.c
+@@ -23,6 +23,7 @@
+
+ #include <sys/types.h>
+ #include <string.h>
++#include <stdint.h>
+
+ /*
+ * Copy src to string dst of size siz. At most siz-1 characters
+@@ -51,8 +52,11 @@ strlcpy(char *dst, const char *src, size_t siz)
+ while (*s++)
+ ;
+ }
+-
+- return(s - src - 1); /* count does not include NUL */
++ /*
++ * Cast pointers to unsigned type before calculation, to avoid signed
++ * overflow when the string ends where the MSB has changed.
++ */
++ return ((uintptr_t)s - (uintptr_t)src - 1); /* count does not include NUL */
+ }
+
+ #endif /* !HAVE_STRLCPY */
+diff --git a/openbsd-compat/strnlen.c b/openbsd-compat/strnlen.c
+index 93d5155..9b8de5d 100644
+--- a/openbsd-compat/strnlen.c
++++ b/openbsd-compat/strnlen.c
+@@ -23,6 +23,7 @@
+ #include <sys/types.h>
+
+ #include <string.h>
++#include <stdint.h>
+
+ size_t
+ strnlen(const char *str, size_t maxlen)
+@@ -31,7 +32,10 @@ strnlen(const char *str, size_t maxlen)
+
+ for (cp = str; maxlen != 0 && *cp != '\0'; cp++, maxlen--)
+ ;
+-
+- return (size_t)(cp - str);
++ /*
++ * Cast pointers to unsigned type before calculation, to avoid signed
++ * overflow when the string ends where the MSB has changed.
++ */
++ return (size_t)((uintptr_t)cp - (uintptr_t)str);
+ }
+ #endif
+--
+1.9.1
+
diff --git a/meta/recipes-connectivity/openssh/openssh_7.3p1.bb b/meta/recipes-connectivity/openssh/openssh_7.3p1.bb
index b31972649df..039b0ffddef 100644
--- a/meta/recipes-connectivity/openssh/openssh_7.3p1.bb
+++ b/meta/recipes-connectivity/openssh/openssh_7.3p1.bb
@@ -24,6 +24,7 @@ SRC_URI = "http://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-${PV}.tar
file://run-ptest \
file://openssh-7.1p1-conditional-compile-des-in-cipher.patch \
file://openssh-7.1p1-conditional-compile-des-in-pkcs11.patch \
+ file://fix-potential-signed-overflow-in-pointer-arithmatic.patch \
"
PAM_SRC_URI = "file://sshd"