From 22000a3b2e9bcc8eb578e999588594303b3c9e04 Mon Sep 17 00:00:00 2001 From: sky42 Date: Wed, 9 Mar 2022 00:45:19 +0100 Subject: [PATCH] linux (RPi): fix dirty pipe CVE-2022-0847 --- .../linux-999.03-fix-dirty-pipe.patch | 40 +++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 packages/linux/patches/raspberrypi/linux-999.03-fix-dirty-pipe.patch diff --git a/packages/linux/patches/raspberrypi/linux-999.03-fix-dirty-pipe.patch b/packages/linux/patches/raspberrypi/linux-999.03-fix-dirty-pipe.patch new file mode 100644 index 0000000000..5317144f10 --- /dev/null +++ b/packages/linux/patches/raspberrypi/linux-999.03-fix-dirty-pipe.patch @@ -0,0 +1,40 @@ +From 9d2231c5d74e13b2a0546fee6737ee4446017903 Mon Sep 17 00:00:00 2001 +From: Max Kellermann +Date: Mon, 21 Feb 2022 11:03:13 +0100 +Subject: [PATCH] lib/iov_iter: initialize "flags" in new pipe_buffer + +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 +To: linux-fsdevel@vger.kernel.org +To: linux-kernel@vger.kernel.org +Cc: stable@vger.kernel.org +Signed-off-by: Max Kellermann +Signed-off-by: Al Viro +--- + lib/iov_iter.c | 2 ++ + 1 file changed, 2 insertions(+) + +diff --git a/lib/iov_iter.c b/lib/iov_iter.c +index b0e0acdf96c15e..6dd5330f7a9957 100644 +--- a/lib/iov_iter.c ++++ b/lib/iov_iter.c +@@ -414,6 +414,7 @@ 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; +@@ -577,6 +578,7 @@ 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);