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Message-Id: <20180215151233.661894157@linuxfoundation.org>
Date: Thu, 15 Feb 2018 16:17:48 +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, Andrey Ryabinin <aryabinin@...tuozzo.com>,
Sodagudi Prasad <psodagud@...eaurora.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 4.9 81/88] lib/ubsan: add type mismatch handler for new GCC/Clang
4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Andrey Ryabinin <aryabinin@...tuozzo.com>
commit 42440c1f9911b4b7b8ba3dc4e90c1197bc561211 upstream.
UBSAN=y fails to build with new GCC/clang:
arch/x86/kernel/head64.o: In function `sanitize_boot_params':
arch/x86/include/asm/bootparam_utils.h:37: undefined reference to `__ubsan_handle_type_mismatch_v1'
because Clang and GCC 8 slightly changed ABI for 'type mismatch' errors.
Compiler now uses new __ubsan_handle_type_mismatch_v1() function with
slightly modified 'struct type_mismatch_data'.
Let's add new 'struct type_mismatch_data_common' which is independent from
compiler's layout of 'struct type_mismatch_data'. And make
__ubsan_handle_type_mismatch[_v1]() functions transform compiler-dependent
type mismatch data to our internal representation. This way, we can
support both old and new compilers with minimal amount of change.
Link: http://lkml.kernel.org/r/20180119152853.16806-1-aryabinin@virtuozzo.com
Signed-off-by: Andrey Ryabinin <aryabinin@...tuozzo.com>
Reported-by: Sodagudi Prasad <psodagud@...eaurora.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
lib/ubsan.c | 48 ++++++++++++++++++++++++++++++++++++++----------
lib/ubsan.h | 14 ++++++++++++++
2 files changed, 52 insertions(+), 10 deletions(-)
--- a/lib/ubsan.c
+++ b/lib/ubsan.c
@@ -265,14 +265,14 @@ void __ubsan_handle_divrem_overflow(stru
}
EXPORT_SYMBOL(__ubsan_handle_divrem_overflow);
-static void handle_null_ptr_deref(struct type_mismatch_data *data)
+static void handle_null_ptr_deref(struct type_mismatch_data_common *data)
{
unsigned long flags;
- if (suppress_report(&data->location))
+ if (suppress_report(data->location))
return;
- ubsan_prologue(&data->location, &flags);
+ ubsan_prologue(data->location, &flags);
pr_err("%s null pointer of type %s\n",
type_check_kinds[data->type_check_kind],
@@ -281,15 +281,15 @@ static void handle_null_ptr_deref(struct
ubsan_epilogue(&flags);
}
-static void handle_misaligned_access(struct type_mismatch_data *data,
+static void handle_misaligned_access(struct type_mismatch_data_common *data,
unsigned long ptr)
{
unsigned long flags;
- if (suppress_report(&data->location))
+ if (suppress_report(data->location))
return;
- ubsan_prologue(&data->location, &flags);
+ ubsan_prologue(data->location, &flags);
pr_err("%s misaligned address %p for type %s\n",
type_check_kinds[data->type_check_kind],
@@ -299,15 +299,15 @@ static void handle_misaligned_access(str
ubsan_epilogue(&flags);
}
-static void handle_object_size_mismatch(struct type_mismatch_data *data,
+static void handle_object_size_mismatch(struct type_mismatch_data_common *data,
unsigned long ptr)
{
unsigned long flags;
- if (suppress_report(&data->location))
+ if (suppress_report(data->location))
return;
- ubsan_prologue(&data->location, &flags);
+ ubsan_prologue(data->location, &flags);
pr_err("%s address %p with insufficient space\n",
type_check_kinds[data->type_check_kind],
(void *) ptr);
@@ -315,7 +315,7 @@ static void handle_object_size_mismatch(
ubsan_epilogue(&flags);
}
-void __ubsan_handle_type_mismatch(struct type_mismatch_data *data,
+static void ubsan_type_mismatch_common(struct type_mismatch_data_common *data,
unsigned long ptr)
{
@@ -326,8 +326,36 @@ void __ubsan_handle_type_mismatch(struct
else
handle_object_size_mismatch(data, ptr);
}
+
+void __ubsan_handle_type_mismatch(struct type_mismatch_data *data,
+ unsigned long ptr)
+{
+ struct type_mismatch_data_common common_data = {
+ .location = &data->location,
+ .type = data->type,
+ .alignment = data->alignment,
+ .type_check_kind = data->type_check_kind
+ };
+
+ ubsan_type_mismatch_common(&common_data, ptr);
+}
EXPORT_SYMBOL(__ubsan_handle_type_mismatch);
+void __ubsan_handle_type_mismatch_v1(struct type_mismatch_data_v1 *data,
+ unsigned long ptr)
+{
+
+ struct type_mismatch_data_common common_data = {
+ .location = &data->location,
+ .type = data->type,
+ .alignment = 1UL << data->log_alignment,
+ .type_check_kind = data->type_check_kind
+ };
+
+ ubsan_type_mismatch_common(&common_data, ptr);
+}
+EXPORT_SYMBOL(__ubsan_handle_type_mismatch_v1);
+
void __ubsan_handle_nonnull_return(struct nonnull_return_data *data)
{
unsigned long flags;
--- a/lib/ubsan.h
+++ b/lib/ubsan.h
@@ -36,6 +36,20 @@ struct type_mismatch_data {
unsigned char type_check_kind;
};
+struct type_mismatch_data_v1 {
+ struct source_location location;
+ struct type_descriptor *type;
+ unsigned char log_alignment;
+ unsigned char type_check_kind;
+};
+
+struct type_mismatch_data_common {
+ struct source_location *location;
+ struct type_descriptor *type;
+ unsigned long alignment;
+ unsigned char type_check_kind;
+};
+
struct nonnull_arg_data {
struct source_location location;
struct source_location attr_location;
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