package/ntfs-3g: add upstream security fix for CVE-2019-9755

Fixes CVE-2019-9755: An integer underflow issue exists in ntfs-3g 2017.3.23.
A local attacker could potentially exploit this by running /bin/ntfs-3g with
specially crafted arguments from a specially crafted directory to cause a
heap buffer overflow, resulting in a crash or the ability to execute
arbitrary code.  In installations where /bin/ntfs-3g is a setuid-root
binary, this could lead to a local escalation of privileges.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

diff --git a/package/ntfs-3g/0001-Fixed-reporting-an-error-when-failed-to-build-the-mo.patch b/package/ntfs-3g/0001-Fixed-reporting-an-error-when-failed-to-build-the-mo.patch
new file mode 100644 (file)
index 0000000..9ba8aae
--- /dev/null
+++ b/package/ntfs-3g/0001-Fixed-reporting-an-error-when-failed-to-build-the-mo.patch
@@ -0,0 +1,72 @@
+From 85c1634a26faa572d3c558d4cf8aaaca5202d4e9 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Jean-Pierre=20Andr=C3=A9?= <jean-pierre.andre@wanadoo.fr>
+Date: Wed, 19 Dec 2018 15:57:50 +0100
+Subject: [PATCH] Fixed reporting an error when failed to build the mountpoint
+
+The size check was inefficient because getcwd() uses an unsigned int
+argument.
+
+Fixes CVE-2019-9755: An integer underflow issue exists in ntfs-3g 2017.3.23.
+A local attacker could potentially exploit this by running /bin/ntfs-3g with
+specially crafted arguments from a specially crafted directory to cause a
+heap buffer overflow, resulting in a crash or the ability to execute
+arbitrary code.  In installations where /bin/ntfs-3g is a setuid-root
+binary, this could lead to a local escalation of privileges.
+
+Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
+---
+ src/lowntfs-3g.c | 6 +++++-
+ src/ntfs-3g.c    | 6 +++++-
+ 2 files changed, 10 insertions(+), 2 deletions(-)
+
+diff --git a/src/lowntfs-3g.c b/src/lowntfs-3g.c
+index 993867fa..0660439b 100644
+--- a/src/lowntfs-3g.c
++++ b/src/lowntfs-3g.c
+@@ -4411,7 +4411,8 @@ int main(int argc, char *argv[])
+       else {
+               ctx->abs_mnt_point = (char*)ntfs_malloc(PATH_MAX);
+               if (ctx->abs_mnt_point) {
+-                      if (getcwd(ctx->abs_mnt_point,
++                      if ((strlen(opts.mnt_point) < PATH_MAX)
++                          && getcwd(ctx->abs_mnt_point,
+                                    PATH_MAX - strlen(opts.mnt_point) - 1)) {
+                               strcat(ctx->abs_mnt_point, "/");
+                               strcat(ctx->abs_mnt_point, opts.mnt_point);
+@@ -4419,6 +4420,9 @@ int main(int argc, char *argv[])
+                       /* Solaris also wants the absolute mount point */
+                               opts.mnt_point = ctx->abs_mnt_point;
+ #endif /* defined(__sun) && defined (__SVR4) */
++                      } else {
++                              free(ctx->abs_mnt_point);
++                              ctx->abs_mnt_point = (char*)NULL;
+                       }
+               }
+       }
+diff --git a/src/ntfs-3g.c b/src/ntfs-3g.c
+index 6ce89fef..4e0912ae 100644
+--- a/src/ntfs-3g.c
++++ b/src/ntfs-3g.c
+@@ -4148,7 +4148,8 @@ int main(int argc, char *argv[])
+       else {
+               ctx->abs_mnt_point = (char*)ntfs_malloc(PATH_MAX);
+               if (ctx->abs_mnt_point) {
+-                      if (getcwd(ctx->abs_mnt_point,
++                      if ((strlen(opts.mnt_point) < PATH_MAX)
++                          && getcwd(ctx->abs_mnt_point,
+                                    PATH_MAX - strlen(opts.mnt_point) - 1)) {
+                               strcat(ctx->abs_mnt_point, "/");
+                               strcat(ctx->abs_mnt_point, opts.mnt_point);
+@@ -4156,6 +4157,9 @@ int main(int argc, char *argv[])
+                       /* Solaris also wants the absolute mount point */
+                               opts.mnt_point = ctx->abs_mnt_point;
+ #endif /* defined(__sun) && defined (__SVR4) */
++                      } else {
++                              free(ctx->abs_mnt_point);
++                              ctx->abs_mnt_point = (char*)NULL;
+                       }
+               }
+       }
+-- 
+2.20.1
+