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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id d1sm7427551pgi.63.2020.02.27.10.49.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 27 Feb 2020 10:49:31 -0800 (PST) From: Kees Cook To: Andrew Morton Cc: Kees Cook , Dmitry Vyukov , Andrey Ryabinin , Elena Petrova , Andrey Konovalov , Alexander Potapenko , Dan Carpenter , "Gustavo A. R. Silva" , Arnd Bergmann , Ard Biesheuvel , kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-hardening@lists.openwall.com, syzkaller@googlegroups.com Subject: [PATCH v4 6/6] ubsan: Include bug type in report header Date: Thu, 27 Feb 2020 10:49:21 -0800 Message-Id: <20200227184921.30215-7-keescook@chromium.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200227184921.30215-1-keescook@chromium.org> References: <20200227184921.30215-1-keescook@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: When syzbot tries to figure out how to deduplicate bug reports, it prefers seeing a hint about a specific bug type (we can do better than just "UBSAN"). This lifts the handler reason into the UBSAN report line that includes the file path that tripped a check. Unfortunately, UBSAN does not provide function names. Suggested-by: Dmitry Vyukov Link: https://lore.kernel.org/lkml/CACT4Y+bsLJ-wFx_TaXqax3JByUOWB3uk787Ls= yMVcfW6JzzGvg@mail.gmail.com Signed-off-by: Kees Cook --- lib/ubsan.c | 36 +++++++++++++++--------------------- 1 file changed, 15 insertions(+), 21 deletions(-) diff --git a/lib/ubsan.c b/lib/ubsan.c index 429663eef6a7..057d5375bfc6 100644 --- a/lib/ubsan.c +++ b/lib/ubsan.c @@ -45,13 +45,6 @@ static bool was_reported(struct source_location *locat= ion) return test_and_set_bit(REPORTED_BIT, &location->reported); } =20 -static void print_source_location(const char *prefix, - struct source_location *loc) -{ - pr_err("%s %s:%d:%d\n", prefix, loc->file_name, - loc->line & LINE_MASK, loc->column & COLUMN_MASK); -} - static bool suppress_report(struct source_location *loc) { return current->in_ubsan || was_reported(loc); @@ -140,13 +133,14 @@ static void val_to_string(char *str, size_t size, s= truct type_descriptor *type, } } =20 -static void ubsan_prologue(struct source_location *location) +static void ubsan_prologue(struct source_location *loc, const char *reas= on) { current->in_ubsan++; =20 pr_err("=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D" "=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D\n"); - print_source_location("UBSAN: Undefined behaviour in", location); + pr_err("UBSAN: %s in %s:%d:%d\n", reason, loc->file_name, + loc->line & LINE_MASK, loc->column & COLUMN_MASK); } =20 static void ubsan_epilogue(void) @@ -180,12 +174,12 @@ static void handle_overflow(struct overflow_data *d= ata, void *lhs, if (suppress_report(&data->location)) return; =20 - ubsan_prologue(&data->location); + ubsan_prologue(&data->location, type_is_signed(type) ? + "signed integer overflow" : + "unsigned integer overflow"); =20 val_to_string(lhs_val_str, sizeof(lhs_val_str), type, lhs); val_to_string(rhs_val_str, sizeof(rhs_val_str), type, rhs); - pr_err("%s integer overflow:\n", - type_is_signed(type) ? "signed" : "unsigned"); pr_err("%s %c %s cannot be represented in type %s\n", lhs_val_str, op, @@ -225,7 +219,7 @@ void __ubsan_handle_negate_overflow(struct overflow_d= ata *data, if (suppress_report(&data->location)) return; =20 - ubsan_prologue(&data->location); + ubsan_prologue(&data->location, "negation overflow"); =20 val_to_string(old_val_str, sizeof(old_val_str), data->type, old_val); =20 @@ -245,7 +239,7 @@ void __ubsan_handle_divrem_overflow(struct overflow_d= ata *data, if (suppress_report(&data->location)) return; =20 - ubsan_prologue(&data->location); + ubsan_prologue(&data->location, "division overflow"); =20 val_to_string(rhs_val_str, sizeof(rhs_val_str), data->type, rhs); =20 @@ -264,7 +258,7 @@ static void handle_null_ptr_deref(struct type_mismatc= h_data_common *data) if (suppress_report(data->location)) return; =20 - ubsan_prologue(data->location); + ubsan_prologue(data->location, "NULL pointer dereference"); =20 pr_err("%s null pointer of type %s\n", type_check_kinds[data->type_check_kind], @@ -279,7 +273,7 @@ static void handle_misaligned_access(struct type_mism= atch_data_common *data, if (suppress_report(data->location)) return; =20 - ubsan_prologue(data->location); + ubsan_prologue(data->location, "misaligned access"); =20 pr_err("%s misaligned address %p for type %s\n", type_check_kinds[data->type_check_kind], @@ -295,7 +289,7 @@ static void handle_object_size_mismatch(struct type_m= ismatch_data_common *data, if (suppress_report(data->location)) return; =20 - ubsan_prologue(data->location); + ubsan_prologue(data->location, "object size mismatch"); pr_err("%s address %p with insufficient space\n", type_check_kinds[data->type_check_kind], (void *) ptr); @@ -354,7 +348,7 @@ void __ubsan_handle_out_of_bounds(struct out_of_bound= s_data *data, void *index) if (suppress_report(&data->location)) return; =20 - ubsan_prologue(&data->location); + ubsan_prologue(&data->location, "array index out of bounds"); =20 val_to_string(index_str, sizeof(index_str), data->index_type, index); pr_err("index %s is out of range for type %s\n", index_str, @@ -375,7 +369,7 @@ void __ubsan_handle_shift_out_of_bounds(struct shift_= out_of_bounds_data *data, if (suppress_report(&data->location)) goto out; =20 - ubsan_prologue(&data->location); + ubsan_prologue(&data->location, "shift out of bounds"); =20 val_to_string(rhs_str, sizeof(rhs_str), rhs_type, rhs); val_to_string(lhs_str, sizeof(lhs_str), lhs_type, lhs); @@ -407,7 +401,7 @@ EXPORT_SYMBOL(__ubsan_handle_shift_out_of_bounds); =20 void __ubsan_handle_builtin_unreachable(struct unreachable_data *data) { - ubsan_prologue(&data->location); + ubsan_prologue(&data->location, "unreachable"); pr_err("calling __builtin_unreachable()\n"); ubsan_epilogue(); panic("can't return from __builtin_unreachable()"); @@ -422,7 +416,7 @@ void __ubsan_handle_load_invalid_value(struct invalid= _value_data *data, if (suppress_report(&data->location)) return; =20 - ubsan_prologue(&data->location); + ubsan_prologue(&data->location, "invalid load"); =20 val_to_string(val_str, sizeof(val_str), data->type, val); =20 --=20 2.20.1