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Most Valuable Bug(?) ~インシデント未遂から得た学び~
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tatsumiakahori
December 26, 2022
Programming
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Most Valuable Bug(?) ~インシデント未遂から得た学び~
間一髪のところでインシデント発生を免れた事象を元に、なぜそのような状況になってしまったのか?どうすればそのような事態を避けられるのか?と言った学びを共有しました。
tatsumiakahori
December 26, 2022
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Transcript
GSJ UBLBIPSJ .PTU7BMVBCMF#VH Πϯγσϯτະ͔Βಘֶͨͼ
ࣗݾհ w λΧϗϦͰ͢ɻ w /VYUKTͰͷϙʔτϑΥϦΦ੍࡞͕ӬԕʹऴΘΓ·ͤΜɻ ࠷ૣ͜͜ϲ݄৮͍ͬͯͳ͍ w
ݹண͖͕ߴͯ͡ɺ࠷ۙݿʹજೖ࢝͠Ί·ͨ͠ɻ ࢥ͍ͷ֎͍͍҆ͯ͘ͷ۷Γग़ָ͍ͤͯ͠ɻ ͨͩɺεϖγϟϧͳΞΠςϜ΄ͱΜͲͳ͍ͷͰɺ վΊ͍͍ͯΞΠςϜἧ͑ͯΔݹண͛͐ͬͯ͢ͳͬͯΔɻ
ઌΧϥϜͷϦϑΝΫλΛߦ͍·ͨ͠ɻ OBNF UZQF OVMM मਖ਼લ EJSFDU@BUUBDL@EJTBCMFE@BU EBUF@UJNF ڐ༰ मਖ਼ޙ
NBJTPLV@CSPXTF@qBH UJOZJOU ෆՄ ˞ςʔϒϧFTUBUFTςʔϒϧ
मਖ਼ͷखॱ ᶃ৽͍͠ΧϥϜΛՃ͢ΔNJHSBUJPO࣮ߦ ᶄσʔλΛ߹ΘͤΔ4FFEFS࣮ߦ ᶅաڈͷΧϥϜ EJSFDU@BUUBDL@EJTBCMFE@BU Λআ
ຊ൪σϓϩΠແࣄऴΘΓɺ ͳ͘Γͬͨͱࢥͬͨཌͷேʜ
ͳΜ͔Τϥʔग़ͱΔʜ
ௐࠪͯ͠ΈΔͱɺ Ͳ͏Β݅ಉظόονͷΤϥʔͬΆ͍ɻ
Division by zero ͱ͋ΔͷͰͰׂΓࢉ͠Α͏ͱͯ͠Τϥʔు͍ͯΔ༷ɻ
֘Օॴ $tsuboUnitPrice = (!$rent || !$area) ? 0 : not_round_display($rent
/ $area); ΉΉɺBSFB ໘ੵ ͰొͰ͖ͳ͍ͣͰʜ
Τϥʔͷର͕݅ɺ͍ͣͿΜੲʹొ ͞ΕͨҠߦ݅Ͱ͋Δ͜ͱ͕໌ɻ ͳͥɺࠓࠒಉظ͞ΕΑ͏ͱ͍ͯͨ͠ͷ͔ʜʁ ͜ͷลΓ͔Βң͕௧͘ͳͬͯ͘Δ
͞ΒʹௐࠪΛਐΊΔͱɺFTUBUFTςʔϒϧͷ ΄ͱΜͲͷϨίʔυͷVQEBUFE@BU͕ࡢͷ σϓϩΠͨ࣌͠ࠁʹͳ͍ͬͯΔ͜ͱ͕໌ɻ
ͳΔ΄Ͳɺͬͨͧɻ
ࡢྲྀͨ͠4FFEFSͷରʹͳͬ ͨ݅શͯͷVQEBUFE@BU͕ߋ৽ ͞Εͯ͠·ͬͯΔͳ͍͔ͱɻ ܭ ݅
ͭ·Γɺ΄΅શͯͷ͕݅ϝʔϧ ৴γεςϜʹಉظ͞Εɺϝʔϧ ৴͞Εͯ͠·͏ڪΕ͕͋Δɻ
ඇৗʹ·͍ͣɻ ʢ࣮͠ࡍʹૹ৴͞ΕͨΒɺԬଜ͞Μ͕ՙ·ͱΊͯಀ͛ग़͢Ϩϕϧʣ
ͨ·ͨ·Τϥʔ͕ى͖͓͔ͨ͛Ͱɺ ݅ಉظόον͕͚ͯ͘͜Εͨͷ Ͱɺϝʔϧ৴͞ΕͣʹࡁΜͩɻ
ରԠͱͯ͠ɺ ᶃ·ͣϝʔϧ৴γεςϜΛҰ࣌ఀࢭͯ͠Β͏ ᶄμϯϓϑΝΠϧΛݩʹVQEBUFE@BUͷΛࡢ ɹͷσϓϩΠલͷʹ͢ ᶅϝʔϧ৴γεςϜͷ࠶։
ͱͳͬͨ4FFEFS &MPRVFOUͰVQEBUFΛ͔͚Δͱɺ֘Ϩί ʔυͷVQEBUFE@BU͕ߋ৽͞Εͯ͠·͏ɻ
ڭ܇ &MPRVFOUͰVQEBUFΛ͔͚Δͱɺ֘Ϩίʔυͷ VQEBUFE@BU͕ߋ৽͞ΕΔ͜ͱΛ಄ʹೖΕ͓ͯ͘͜ͱɻ ߋ৽ͤͨ͘͞ͳ͍߹ɺ ɾVQEBUFE@BUΛऔಘͯ͠ɺ͏ҰೖΕͯ͋͛Δ ɾ%#ϑΝαʔυΛ༻͍ͯɺ42-Λॻ͖ࠐΉ ͳͲͷରԠ͕ඞཁͱͳΔɻ
ͪͳΈʹʜ
͓Θ͔Γ͍͚ͨͩΔͩΖ͏͔ʜʁ
࣮ࡍʹൃߦ͞ΕͨΫΤϦ .JHSBUJPO࣮ߦ࣌ʹɺσϑΥϧτͰ͕ೖ͍ͬͯͨͷͰɺೋͭ ͷΫΤϦ͕ಈ࡞͠ͳͯ݁͘Ռͱͯ͠ʹͳΒͳ͔ͬͨɻ ͦΜͳϨίʔυଘࡏ͠ͳ͍
͜͏ॻ͖ͩͬͨ͘
N @@ N