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

Browse Source 
https://dirtypipe.cm4all.com

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
This commit is contained in:
Michael Tremer
2022-03-08 09:59:43 +00:00
parent 6fe4eb6094
commit 32ce7ab402
2 changed files with 49 additions and 0 deletions
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3
lfs/linux
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@@ -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

46
src/patches/kernel-5.15-CVE-2022-0847.patch Normal file
View File

@@ -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