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lib/ubsan: add type mismatch handler for new GCC/Clang

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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@virtuozzo.com>
Reported-by: Sodagudi Prasad <psodagud@codeaurora.org>
Cc: <stable@vger.kernel.org>	[4.5+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrey Ryabinin 2018-02-06 15:40:42 -08:00 committed by Linus Torvalds
parent b8fe1120b4
commit 42440c1f99
2 changed files with 52 additions and 10 deletions
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48
lib/ubsan.c
View File

@ -265,14 +265,14 @@ void __ubsan_handle_divrem_overflow(struct overflow_data *data,
}
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 type_mismatch_data *data)
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(struct type_mismatch_data *data,
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(struct type_mismatch_data *data,
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 type_mismatch_data *data,
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;

14
lib/ubsan.h
View File

@ -37,6 +37,20 @@ 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;