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Resolver: fixed use-after-free memory accesses with CNAME. When several requests were waiting for a response, then after getting a CNAME response only the last request's context had the name updated. Contexts of other requests had the wrong name. This name was used by ngx_resolve_name_done() to find the node to remove the request context from. When the name was wrong, the request could not be properly cancelled, its context was freed but stayed linked to the node's waiting list. This happened e.g. when the first request was aborted or timed out before the resolving completed. When it completed, this triggered a use-after-free memory access by calling ctx->handler of already freed request context. The bug manifests itself by "could not cancel <name> resolving" alerts in error_log. When a request was responded with a CNAME, the request context kept the pointer to the original node's rn->u.cname. If the original node expired before the resolving timed out or completed with an error, this would trigger a use-after-free memory access via ctx->name in ctx->handler(). The fix is to keep ctx->name unmodified. The name from context is no longer used by ngx_resolve_name_done(). Instead, we now keep the pointer to resolver node to which this request is linked. Keeping the original name intact also improves logging.
author Roman Arutyunyan <arut@nginx.com>
date Tue, 26 Jan 2016 16:46:59 +0300
parents 63a820b0bc6c
children
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# This map is not a full windows-1251 <> utf8 map: it does not
# contain Serbian and Macedonian letters.  If you need a full map,
# use contrib/unicode2nginx/win-utf map instead.

charset_map  windows-1251  utf-8 {

    82  E2809A ; # single low-9 quotation mark

    84  E2809E ; # double low-9 quotation mark
    85  E280A6 ; # ellipsis
    86  E280A0 ; # dagger
    87  E280A1 ; # double dagger
    88  E282AC ; # euro
    89  E280B0 ; # per mille

    91  E28098 ; # left single quotation mark
    92  E28099 ; # right single quotation mark
    93  E2809C ; # left double quotation mark
    94  E2809D ; # right double quotation mark
    95  E280A2 ; # bullet
    96  E28093 ; # en dash
    97  E28094 ; # em dash

    99  E284A2 ; # trade mark sign

    A0  C2A0 ;   # &nbsp;
    A1  D18E ;   # capital Byelorussian short U
    A2  D19E ;   # small Byelorussian short u

    A4  C2A4 ;   # currency sign
    A5  D290 ;   # capital Ukrainian soft G
    A6  C2A6 ;   # borken bar
    A7  C2A7 ;   # section sign
    A8  D081 ;   # capital YO
    A9  C2A9 ;   # (C)
    AA  D084 ;   # capital Ukrainian YE
    AB  C2AB ;   # left-pointing double angle quotation mark
    AC  C2AC ;   # not sign
    AD  C2AD ;   # soft hypen
    AE  C2AE ;   # (R)
    AF  D087 ;   # capital Ukrainian YI

    B0  C2B0 ;   # &deg;
    B1  C2B1 ;   # plus-minus sign
    B2  D086 ;   # capital Ukrainian I
    B3  D196 ;   # small Ukrainian i
    B4  D291 ;   # small Ukrainian soft g
    B5  C2B5 ;   # micro sign
    B6  C2B6 ;   # pilcrow sign
    B7  C2B7 ;   # &middot;
    B8  D191 ;   # small yo
    B9  E28496 ; # numero sign
    BA  D194 ;   # small Ukrainian ye
    BB  C2BB ;   # right-pointing double angle quotation mark

    BF  D197 ;   # small Ukrainian yi

    C0  D090 ;   # capital A
    C1  D091 ;   # capital B
    C2  D092 ;   # capital V
    C3  D093 ;   # capital G
    C4  D094 ;   # capital D
    C5  D095 ;   # capital YE
    C6  D096 ;   # capital ZH
    C7  D097 ;   # capital Z
    C8  D098 ;   # capital I
    C9  D099 ;   # capital J
    CA  D09A ;   # capital K
    CB  D09B ;   # capital L
    CC  D09C ;   # capital M
    CD  D09D ;   # capital N
    CE  D09E ;   # capital O
    CF  D09F ;   # capital P

    D0  D0A0 ;   # capital R
    D1  D0A1 ;   # capital S
    D2  D0A2 ;   # capital T
    D3  D0A3 ;   # capital U
    D4  D0A4 ;   # capital F
    D5  D0A5 ;   # capital KH
    D6  D0A6 ;   # capital TS
    D7  D0A7 ;   # capital CH
    D8  D0A8 ;   # capital SH
    D9  D0A9 ;   # capital SHCH
    DA  D0AA ;   # capital hard sign
    DB  D0AB ;   # capital Y
    DC  D0AC ;   # capital soft sign
    DD  D0AD ;   # capital E
    DE  D0AE ;   # capital YU
    DF  D0AF ;   # capital YA

    E0  D0B0 ;   # small a
    E1  D0B1 ;   # small b
    E2  D0B2 ;   # small v
    E3  D0B3 ;   # small g
    E4  D0B4 ;   # small d
    E5  D0B5 ;   # small ye
    E6  D0B6 ;   # small zh
    E7  D0B7 ;   # small z
    E8  D0B8 ;   # small i
    E9  D0B9 ;   # small j
    EA  D0BA ;   # small k
    EB  D0BB ;   # small l
    EC  D0BC ;   # small m
    ED  D0BD ;   # small n
    EE  D0BE ;   # small o
    EF  D0BF ;   # small p

    F0  D180 ;   # small r
    F1  D181 ;   # small s
    F2  D182 ;   # small t
    F3  D183 ;   # small u
    F4  D184 ;   # small f
    F5  D185 ;   # small kh
    F6  D186 ;   # small ts
    F7  D187 ;   # small ch
    F8  D188 ;   # small sh
    F9  D189 ;   # small shch
    FA  D18A ;   # small hard sign
    FB  D18B ;   # small y
    FC  D18C ;   # small soft sign
    FD  D18D ;   # small e
    FE  D18E ;   # small yu
    FF  D18F ;   # small ya
}