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From: Kees Cook <keescook@chromium.org>
To: Eric Biederman <ebiederm@xmission.com>
Cc: Kees Cook <keescook@chromium.org>,
	kexec@lists.infradead.org, Baoquan He <bhe@redhat.com>,
	Vivek Goyal <vgoyal@redhat.com>, Dave Young <dyoung@redhat.com>,
	Nathan Chancellor <nathan@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Tom Rix <trix@redhat.com>,
	linux-kernel@vger.kernel.org, llvm@lists.linux.dev,
	linux-hardening@vger.kernel.org
Subject: [PATCH] kexec: Annotate struct crash_mem with __counted_by
Date: Fri, 22 Sep 2023 10:52:24 -0700	[thread overview]
Message-ID: <20230922175224.work.712-kees@kernel.org> (raw)

Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

As found with Coccinelle[1], add __counted_by for struct crash_mem.

[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Cc: Eric Biederman <ebiederm@xmission.com>
Cc: kexec@lists.infradead.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
 include/linux/crash_core.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/crash_core.h b/include/linux/crash_core.h
index 3426f6eef60b..5126a4fecb44 100644
--- a/include/linux/crash_core.h
+++ b/include/linux/crash_core.h
@@ -131,7 +131,7 @@ static inline void __init reserve_crashkernel_generic(char *cmdline,
 struct crash_mem {
 	unsigned int max_nr_ranges;
 	unsigned int nr_ranges;
-	struct range ranges[];
+	struct range ranges[] __counted_by(max_nr_ranges);
 };
 
 extern int crash_exclude_mem_range(struct crash_mem *mem,
-- 
2.34.1


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WARNING: multiple messages have this Message-ID (diff)
From: Kees Cook <keescook@chromium.org>
To: Eric Biederman <ebiederm@xmission.com>
Cc: Kees Cook <keescook@chromium.org>,
	kexec@lists.infradead.org, Baoquan He <bhe@redhat.com>,
	Vivek Goyal <vgoyal@redhat.com>, Dave Young <dyoung@redhat.com>,
	Nathan Chancellor <nathan@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Tom Rix <trix@redhat.com>,
	linux-kernel@vger.kernel.org, llvm@lists.linux.dev,
	linux-hardening@vger.kernel.org
Subject: [PATCH] kexec: Annotate struct crash_mem with __counted_by
Date: Fri, 22 Sep 2023 10:52:24 -0700	[thread overview]
Message-ID: <20230922175224.work.712-kees@kernel.org> (raw)

Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

As found with Coccinelle[1], add __counted_by for struct crash_mem.

[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Cc: Eric Biederman <ebiederm@xmission.com>
Cc: kexec@lists.infradead.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
 include/linux/crash_core.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/crash_core.h b/include/linux/crash_core.h
index 3426f6eef60b..5126a4fecb44 100644
--- a/include/linux/crash_core.h
+++ b/include/linux/crash_core.h
@@ -131,7 +131,7 @@ static inline void __init reserve_crashkernel_generic(char *cmdline,
 struct crash_mem {
 	unsigned int max_nr_ranges;
 	unsigned int nr_ranges;
-	struct range ranges[];
+	struct range ranges[] __counted_by(max_nr_ranges);
 };
 
 extern int crash_exclude_mem_range(struct crash_mem *mem,
-- 
2.34.1


             reply	other threads:[~2023-09-22 17:52 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-09-22 17:52 Kees Cook [this message]
2023-09-22 17:52 ` [PATCH] kexec: Annotate struct crash_mem with __counted_by Kees Cook
2023-09-23  0:46 ` Baoquan He
2023-09-23  0:46   ` Baoquan He
2023-09-23  3:25   ` Kees Cook
2023-09-23  3:25     ` Kees Cook
2023-09-24  0:52     ` Baoquan He
2023-09-24  0:52       ` Baoquan He
2023-10-24 21:18 ` Kees Cook
2023-10-24 21:18   ` Kees Cook

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