{"id":221693,"date":"2020-12-08T17:21:35","date_gmt":"2020-12-08T09:21:35","guid":{"rendered":"http:\/\/4563.org\/?p=221693"},"modified":"2020-12-08T17:21:35","modified_gmt":"2020-12-08T09:21:35","slug":"%e8%bf%99%e7%a7%8d-crash-%e7%ae%97%e6%98%af%e5%b4%a9%e6%ba%83%e5%9c%a8%e5%93%aa%e4%b8%80%e8%a1%8c%ef%bc%9f","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=221693","title":{"rendered":"\u8fd9\u79cd crash \u7b97\u662f\u5d29\u6e83\u5728\u54ea\u4e00\u884c\uff1f"},"content":{"rendered":"
\n
\n
\n

\u8fd9\u79cd crash \u7b97\u662f\u5d29\u6e83\u5728\u54ea\u4e00\u884c\uff1f <\/h1>\n

<\/p>\n

\n
\u8cc7\u6df1\u5927\u4f6c : fffang <\/span> <\/i> 1<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

\"\u8fd9\u79cd<\/p>\n

\u6bd4\u5982\u8fd9\u4e2a\uff0c\u662f\u6267\u884c objc_retain \u5d29\u6e83\u8fd8\u662f\u6267\u884c ldr \u5d29\u6e83\u7684\uff1f<\/p>\n

\u4e4b\u6240\u4ee5\u95ee\u8fd9\u4e2a\u95ee\u9898\u662f\u6211\u5728 ldr \u5904\u6253\u4e86\u65ad\u70b9\uff0c\u6309\u9053\u7406\u8bf4\u8fd8\u6ca1\u6267\u884c ldr \u3002<\/p>\n<\/p><\/div>\n

\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (5<\/span>) <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : Qusic <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4e0a\u4e00\u884c\uff0cretain bl \u8fc7\u53bb\u8bbf\u95ee\u4e86 0x20 \u8fd9\u4e2a\u65e0\u6548\u7684\u5730\u5740 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : sunnywqf <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4f30\u8ba1\u662f x0 \u91cc\u7684\u5bf9\u8c61\u5df2\u7ecf\u88ab\u91ca\u653e\u4e86:<\/p>\n

    (lldb) disassemble -n objc_retain
    libobjc.A.dylib`objc_retain:
    0x1c0aa7be0 <+0>: cbz x0, 0x1c0aa7c14 ; <+52>
    0x1c0aa7be4 <+4>: tbnz x0, #0x3f, 0x1c0aa7c14 ; <+52>
    0x1c0aa7be8 <+8>: ldr x8, [x0]
    0x1c0aa7bec <+12>: and x8, x8, #0xffffffff8
    0x1c0aa7bf0 <+16>: ldrb w8, [x8, #0x20] \/\/\/\/\/\/\/\/ \u662f\u5728\u8fd9\u91cc\u6302\u4e86, \u52a0\u4e2a\u65ad\u70b9\u770b\u770b
    0x1c0aa7bf4 <+20>: tbz w8, #0x2, 0x1c0aa7c18 ; <+56>
    0x1c0aa7bf8 <+24>: orr x8, xzr, #0x200000000000 <\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : fffang <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @sunnywqf
    \u4e3a\u5565\u6211\u5728 hopper \u91cc\u6216 xcode \u65ad\u70b9\u91cc\u770b objc_retain \u662f\u8fd9\u6837\u7684<\/p>\n

    “`
    imp___stubs__objc_retain: \/\/ objc_retain
    0000000100006548 nop ; CODE XREF=-[UIViewController new_initWithCoder:]+84
    000000010000654c ldr x16, #_objc_retain_ptr ; _objc_retain
    0000000100006550 br x16 ; _objc_retain
    ; endp
    “` <\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : fffang <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    “`
    – (instancetype)new_initWithCoder:(NSCoder *)coder{
    [self new_initWithCoder:coder];
    return self;
    }
    “`<\/p>\n

    @sunnywqf \u539f\u59cb\u4ee3\u7801\u5c31\u8fd9\u4e9b\uff0c\u5c31\u662f hook \u4e86\u521d\u59cb\u5316\u65b9\u6cd5\u3002\u6309\u7167\u4e0a\u8ff0\u4ee3\u7801\u8fd0\u884c\u4f1a\u5d29\u6e83\uff0c\u4f46\u662f\u76f4\u63a5` [self new_initWithCoder:coder];`\u8fd9\u6837\u662f\u4e0d\u4f1a\u5d29\u6e83\u7684\uff0c\u6709\u5174\u8da3\u7684\u8bdd\u53ef\u4ee5\u4e00\u8d77\u7814\u7a76\u4e0b\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : sunnywqf <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @fffang \u80fd\u7ed9\u4e00\u4e2a\u66f4\u5b8c\u6574\u7684 demo \u5417? <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n","protected":false},"excerpt":{"rendered":"

    \u8fd9\u79cd crash \u7b97\u662f\u5d29\u6e83\u5728\u54ea\u4e00\u884c…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/221693"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=221693"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/221693\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=221693"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=221693"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=221693"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}