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do_div.cocci
// SPDX-License-Identifier: GPL-2.0-only /// do_div() does a 64-by-32 division. /// When the divisor is long, unsigned long, u64, or s64, /// do_div() truncates it to 32 bits, this means it can test /// non-zero and be truncated to 0 for division on 64bit platforms. /// //# This makes an effort to find those inappropriate do_div() calls. // // Confidence: Moderate // Copyright: (C) 2020 Wen Yang, Alibaba. // Comments: // Options: --no-includes --include-headers virtual context virtual org virtual report @initialize:python@ @@ def get_digit_type_and_value(str): is_digit = False value = 0 try: if (str.isdigit()): is_digit = True value = int(str, 0) elif (str.upper().endswith('ULL')): is_digit = True value = int(str[:-3], 0) elif (str.upper().endswith('LL')): is_digit = True value = int(str[:-2], 0) elif (str.upper().endswith('UL')): is_digit = True value = int(str[:-2], 0) elif (str.upper().endswith('L')): is_digit = True value = int(str[:-1], 0) elif (str.upper().endswith('U')): is_digit = True value = int(str[:-1], 0) except Exception as e: print('Error:',e) is_digit = False value = 0 finally: return is_digit, value def filter_out_safe_constants(str): is_digit, value = get_digit_type_and_value(str) if (is_digit): if (value >= 0x100000000): return True else: return False else: return True def construct_warnings(suggested_fun): msg="WARNING: do_div() does a 64-by-32 division, please consider using %s instead." return msg % suggested_fun @depends on context@ expression f; long l: script:python() { filter_out_safe_constants(l) }; unsigned long ul : script:python() { filter_out_safe_constants(ul) }; u64 ul64 : script:python() { filter_out_safe_constants(ul64) }; s64 sl64 : script:python() { filter_out_safe_constants(sl64) }; @@ ( * do_div(f, l); | * do_div(f, ul); | * do_div(f, ul64); | * do_div(f, sl64); ) @r depends on (org || report)@ expression f; position p; long l: script:python() { filter_out_safe_constants(l) }; unsigned long ul : script:python() { filter_out_safe_constants(ul) }; u64 ul64 : script:python() { filter_out_safe_constants(ul64) }; s64 sl64 : script:python() { filter_out_safe_constants(sl64) }; @@ ( do_div@p(f, l); | do_div@p(f, ul); | do_div@p(f, ul64); | do_div@p(f, sl64); ) @script:python depends on org@ p << r.p; ul << r.ul; @@ coccilib.org.print_todo(p[0], construct_warnings("div64_ul")) @script:python depends on org@ p << r.p; l << r.l; @@ coccilib.org.print_todo(p[0], construct_warnings("div64_long")) @script:python depends on org@ p << r.p; ul64 << r.ul64; @@ coccilib.org.print_todo(p[0], construct_warnings("div64_u64")) @script:python depends on org@ p << r.p; sl64 << r.sl64; @@ coccilib.org.print_todo(p[0], construct_warnings("div64_s64")) @script:python depends on report@ p << r.p; ul << r.ul; @@ coccilib.report.print_report(p[0], construct_warnings("div64_ul")) @script:python depends on report@ p << r.p; l << r.l; @@ coccilib.report.print_report(p[0], construct_warnings("div64_long")) @script:python depends on report@ p << r.p; sl64 << r.sl64; @@ coccilib.report.print_report(p[0], construct_warnings("div64_s64")) @script:python depends on report@ p << r.p; ul64 << r.ul64; @@ coccilib.report.print_report(p[0], construct_warnings("div64_u64"))
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