[dunfell] epiphany: fix CVE-2022-29536

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

I'm getting a do_patch error with this change:

ERROR: epiphany-3.34.4-r0 do_patch: Applying patch
'CVE-2022-29536.patch' on target directory
'/home/steve/builds/poky-contrib/build/tmp/work/core2-64-poky-linux/epiphany/3.34.4-r0/epiphany-3.34.4'
Command Error: 'quilt --quiltrc
/home/steve/builds/poky-contrib/build/tmp/work/core2-64-poky-linux/epiphany/3.34.4-r0/recipe-sysroot-native/etc/quiltrc
push' exited with 0  Output:
Applying patch CVE-2022-29536.patch
patching file lib/ephy-string.c
Hunk #1 FAILED at 115.
1 out of 1 hunk FAILED -- rejects in file lib/ephy-string.c
Patch CVE-2022-29536.patch does not apply (enforce with -f)

I took a quick look at failing file, and it is indeed slightly
different than what the patch assumes.

Steve

On Thu, Jun 30, 2022 at 8:48 AM Minjae Kim <flowergom@gmail.com> wrote:
>
> 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
>
>
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