[dunfell][PATCH] epiphany: fix CVE-2022-29536

[Minjae Kim <flowergom@gmail.com>]

Fix memory corruption in ephy_string_shorten()

Upstream-Status: Backport [https://gitlab.gnome.org/GNOME/epiphany/-/merge_requests/1106]
CVE: CVE-2022-29536

Signed-off-by:Minjae Kim <flowergom@gmail.com>
---
 .../recipes-gnome/epiphany/epiphany_3.34.4.bb |  3 +-
 .../epiphany/files/CVE-2022-29536.patch       | 45 +++++++++++++++++++
 2 files changed, 47 insertions(+), 1 deletion(-)
 create mode 100644 meta/recipes-gnome/epiphany/files/CVE-2022-29536.patch

diff --git a/meta/recipes-gnome/epiphany/epiphany_3.34.4.bb b/meta/recipes-gnome/epiphany/epiphany_3.34.4.bb
index e2afb29c12..6f04324d4e 100644
--- a/meta/recipes-gnome/epiphany/epiphany_3.34.4.bb
+++ b/meta/recipes-gnome/epiphany/epiphany_3.34.4.bb
@@ -16,7 +16,8 @@ REQUIRED_DISTRO_FEATURES = "x11 opengl"
 
 SRC_URI = "${GNOME_MIRROR}/${GNOMEBN}/${@gnome_verdir("${PV}")}/${GNOMEBN}-${PV}.tar.${GNOME_COMPRESS_TYPE};name=archive \
            file://0002-help-meson.build-disable-the-use-of-yelp.patch \
-           "
+           file://CVE-2022-29536.patch \
+          "
 SRC_URI[archive.md5sum] = "a559f164bb7d6cbeceb348648076830b"
 SRC_URI[archive.sha256sum] = "60e190fc07ec7e33472e60c7e633e04004f7e277a0ffc5e9cd413706881e598d"
 
diff --git a/meta/recipes-gnome/epiphany/files/CVE-2022-29536.patch b/meta/recipes-gnome/epiphany/files/CVE-2022-29536.patch
new file mode 100644
index 0000000000..c2160b471d
--- /dev/null
+++ b/meta/recipes-gnome/epiphany/files/CVE-2022-29536.patch
@@ -0,0 +1,45 @@
+From 79725738500917cf5e4d829c76753cfb4c68be7f Mon Sep 17 00:00:00 2001
+From: Michael Catanzaro <mcatanzaro@redhat.com>
+Date: Fri, 15 Apr 2022 18:09:46 -0500
+Subject: [PATCH] Fix memory corruption in ephy_string_shorten()
+
+This fixes a regression that I introduced in 232c613472b38ff0d0d97338f366024ddb9cd228.
+
+I got my browser stuck in a crash loop today while visiting a website
+with a page title greater than ephy-embed.c's MAX_TITLE_LENGTH, the only
+condition in which ephy_string_shorten() is ever used. Turns out this
+commit is wrong: an ellipses is a multibyte character (three bytes in
+UTF-8) and so we're writing past the end of the buffer when calling
+strcat() here. Ooops.
+
+Shame it took nearly four years to notice and correct this.
+
+Part-of: <https://gitlab.gnome.org/GNOME/epiphany/-/merge_requests/1106>
+
+Upstream-Status: Backport [https://gitlab.gnome.org/GNOME/epiphany/-/merge_requests/1106]
+Signed-off-by:Minjae Kim <flowergom@gmail.com>
+---
+ lib/ephy-string.c | 5 ++---
+ 1 file changed, 2 insertions(+), 3 deletions(-)
+
+diff --git a/lib/ephy-string.c b/lib/ephy-string.c
+index 509490c86..d678803ad 100644
+--- a/lib/ephy-string.c
++++ b/lib/ephy-string.c
+@@ -115,11 +115,10 @@ ephy_string_shorten (char  *str,
+   /* create string */
+   bytes = GPOINTER_TO_UINT (g_utf8_offset_to_pointer (str, target_length - 1) - str);
+
+-  /* +1 for ellipsis, +1 for trailing NUL */
+-  new_str = g_new (gchar, bytes + 1 + 1);
++  new_str = g_new (gchar, bytes + strlen ("?~@?") + 1);
+
+   strncpy (new_str, str, bytes);
+-  strcat (new_str, "?~@?");
++  strncpy (new_str + bytes, "?~@?", strlen ("?~@?") + 1);
+
+   g_free (str);
+
+--
+2.25.1
+
-- 
2.17.1