From: Michael Tremer <michael.tremer@ipfire.org>
Date: Tue, 8 Mar 2022 09:59:43 +0000 (+0000)
Subject: linux: Fix for CVE-2022-0847 aka Dirty Pipe
X-Git-Url: http://git.ipfire.org/?p=people%2Fpmueller%2Fipfire-2.x.git;a=commitdiff_plain;h=32ce7ab402ffe7cd93ea273af95d5f3d4791a612

linux: Fix for CVE-2022-0847 aka Dirty Pipe

https://dirtypipe.cm4all.com

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
---

diff --git a/lfs/linux b/lfs/linux
index fae9715ecf..346deb6f85 100644
--- a/lfs/linux
+++ b/lfs/linux
@@ -146,6 +146,9 @@ ifeq "$(BUILD_ARCH)" "aarch64"
 endif
 	cd $(DIR_APP) && patch -Np1 < $(DIR_SRC)/src/patches/linux/linux-3.14.79-amba-fix.patch
 
+	# Fix for CVE-2022-0847 aka Dirty Pipe
+	cd $(DIR_APP) && patch -Np1 < $(DIR_SRC)/src/patches/kernel-5.15-CVE-2022-0847.patch
+
 ifeq "$(KCFG)" "-headers"
 	# Install the header files
 	cd $(DIR_APP) && make ARCH=$(HEADERS_ARCH) $(EXTRAMAKE) headers
diff --git a/src/patches/kernel-5.15-CVE-2022-0847.patch b/src/patches/kernel-5.15-CVE-2022-0847.patch
new file mode 100644
index 0000000000..5279916c27
--- /dev/null
+++ b/src/patches/kernel-5.15-CVE-2022-0847.patch
@@ -0,0 +1,46 @@
+From 114e9f141822e6977633d322c1b03e89bd209932 Mon Sep 17 00:00:00 2001
+From: Max Kellermann <max.kellermann@ionos.com>
+Date: Mon, 21 Feb 2022 11:03:13 +0100
+Subject: [PATCH] lib/iov_iter: initialize "flags" in new pipe_buffer
+
+commit 9d2231c5d74e13b2a0546fee6737ee4446017903 upstream.
+
+The functions copy_page_to_iter_pipe() and push_pipe() can both
+allocate a new pipe_buffer, but the "flags" member initializer is
+missing.
+
+Fixes: 241699cd72a8 ("new iov_iter flavour: pipe-backed")
+To: Alexander Viro <viro@zeniv.linux.org.uk>
+To: linux-fsdevel@vger.kernel.org
+To: linux-kernel@vger.kernel.org
+Cc: stable@vger.kernel.org
+Signed-off-by: Max Kellermann <max.kellermann@ionos.com>
+Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ lib/iov_iter.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/lib/iov_iter.c b/lib/iov_iter.c
+index 60b5e6edfbaa..c5b2f0f4b8a8 100644
+--- a/lib/iov_iter.c
++++ b/lib/iov_iter.c
+@@ -416,6 +416,7 @@ static size_t copy_page_to_iter_pipe(struct page *page, size_t offset, size_t by
+ 		return 0;
+ 
+ 	buf->ops = &page_cache_pipe_buf_ops;
++	buf->flags = 0;
+ 	get_page(page);
+ 	buf->page = page;
+ 	buf->offset = offset;
+@@ -532,6 +533,7 @@ static size_t push_pipe(struct iov_iter *i, size_t size,
+ 			break;
+ 
+ 		buf->ops = &default_pipe_buf_ops;
++		buf->flags = 0;
+ 		buf->page = page;
+ 		buf->offset = 0;
+ 		buf->len = min_t(ssize_t, left, PAGE_SIZE);
+-- 
+2.30.2
+