git: CVE-2018-11233

* CVE-2018-11233
Code to sanity-check pathnames on NTFS can result in reading
out-of-bounds memory.

Affects < 2.17.1

CVE: CVE-2018-11233
Ref: https://bugzilla.redhat.com/show_bug.cgi?id=1583888
(From OE-Core rev: d145f605c274386baf0dde023f15cddf37523f3b)

Signed-off-by: Sinan Kaya <okaya@kernel.org>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 44 insertions, 0 deletions

diff --git a/meta/recipes-devtools/git/files/CVE-2018-11233.patch b/meta/recipes-devtools/git/files/CVE-2018-11233.patch
new file mode 100644
index 0000000000..f4468cf2fd
--- /dev/null
+++ b/meta/recipes-devtools/git/files/CVE-2018-11233.patch
@@ -0,0 +1,44 @@
+From 014281e62b7920a6d710a85089e00ca012b0744c Mon Sep 17 00:00:00 2001
+From: Jeff King <peff@peff.net>
+Date: Sun, 13 May 2018 12:09:42 -0400
+Subject: [PATCH] is_ntfs_dotgit: use a size_t for traversing string
+
+We walk through the "name" string using an int, which can
+wrap to a negative value and cause us to read random memory
+before our array (e.g., by creating a tree with a name >2GB,
+since "int" is still 32 bits even on most 64-bit platforms).
+Worse, this is easy to trigger during the fsck_tree() check,
+which is supposed to be protecting us from malicious
+garbage.
+
+Note one bit of trickiness in the existing code: we
+sometimes assign -1 to "len" at the end of the loop, and
+then rely on the "len++" in the for-loop's increment to take
+it back to 0. This is still legal with a size_t, since
+assigning -1 will turn into SIZE_MAX, which then wraps
+around to 0 on increment.
+
+Signed-off-by: Jeff King <peff@peff.net>
+CVE: CVE-2018-11233
+Upstream-Status: Backport[https://github.com/git/git/commit/11a9f4d807a0d71dc6eff51bb87baf4ca2cccf1d]
+Signed-off-by: Sinan Kaya <okaya@kernel.org>
+---
+ path.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/path.c b/path.c
+index da8b65573..d31c795ff 100644
+--- a/path.c
++++ b/path.c
+@@ -1305,7 +1305,7 @@ static int only_spaces_and_periods(const char *path, size_t len, size_t skip)
+ 
+ int is_ntfs_dotgit(const char *name)
+ {
+-       int len;
++       size_t len;
+ 
+        for (len = 0; ; len++)
+                if (!name[len] || name[len] == '\\' || is_dir_sep(name[len])) {
+-- 
+2.19.0
+