linux-kernel - [PATCH 5.8 186/633] mm/error_inject: Fix allow_error

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Date:   Tue, 27 Oct 2020 14:48:49 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Josef Bacik <josef@...icpanda.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.8 186/633] mm/error_inject: Fix allow_error_inject function signatures.

From: Alexei Starovoitov <ast@...nel.org>

[ Upstream commit 76cd61739fd107a7f7ec4c24a045e98d8ee150f0 ]

'static' and 'static noinline' function attributes make no guarantees that
gcc/clang won't optimize them. The compiler may decide to inline 'static'
function and in such case ALLOW_ERROR_INJECT becomes meaningless. The compiler
could have inlined __add_to_page_cache_locked() in one callsite and didn't
inline in another. In such case injecting errors into it would cause
unpredictable behavior. It's worse with 'static noinline' which won't be
inlined, but it still can be optimized. Like the compiler may decide to remove
one argument or constant propagate the value depending on the callsite.

To avoid such issues make sure that these functions are global noinline.

Fixes: af3b854492f3 ("mm/page_alloc.c: allow error injection")
Fixes: cfcbfb1382db ("mm/filemap.c: enable error injection at add_to_page_cache()")
Signed-off-by: Alexei Starovoitov <ast@...nel.org>
Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
Reviewed-by: Josef Bacik <josef@...icpanda.com>
Link: https://lore.kernel.org/bpf/20200827220114.69225-2-alexei.starovoitov@gmail.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 mm/filemap.c    | 8 ++++----
 mm/page_alloc.c | 2 +-
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index 385759c4ce4be..6c3b879116212 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -826,10 +826,10 @@ int replace_page_cache_page(struct page *old, struct page *new, gfp_t gfp_mask)
 }
 EXPORT_SYMBOL_GPL(replace_page_cache_page);
 
-static int __add_to_page_cache_locked(struct page *page,
-				      struct address_space *mapping,
-				      pgoff_t offset, gfp_t gfp_mask,
-				      void **shadowp)
+noinline int __add_to_page_cache_locked(struct page *page,
+					struct address_space *mapping,
+					pgoff_t offset, gfp_t gfp_mask,
+					void **shadowp)
 {
 	XA_STATE(xas, &mapping->i_pages, offset);
 	int huge = PageHuge(page);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 43f6d91f57156..802f00540a3d2 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3487,7 +3487,7 @@ static inline bool __should_fail_alloc_page(gfp_t gfp_mask, unsigned int order)
 
 #endif /* CONFIG_FAIL_PAGE_ALLOC */
 
-static noinline bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order)
+noinline bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order)
 {
 	return __should_fail_alloc_page(gfp_mask, order);
 }
-- 
2.25.1