Luís Soares wrote:
> Hi Zhenxing,
>
> Nice Work.
> Please find my review comments below.
>
> STATUS
> ------
>
> Approved.
>
> REQUIRED CHANGES
> ----------------
> n/a
>
> REQUESTS
> --------
> n/a
>
> SUGGESTIONS
> -----------
>
> S1. A simple 'grep strcpy plugin/semisync/*' showed me eight
> lines of code. There is nothing wong in using strcpy if one
> can claim that overflow is impossible. I trust this to be
> the case for all eight lines.
>
> If in doubt (I confess I did not check thoroughly any of
> the eight lines), please have a look at those lines.
>
Thank you for the advice, I'll have a look and fix if necessary!
> DETAILS
> -------
> n/a
>
> On Mon, 2010-05-24 at 02:57 +0000, He Zhenxing wrote:
> > #At file:///media/sdb2/hezx/work/mysql/bzr/b52748/trunk-bugfixing/ based on
> revid:jon.hauglid@stripped
> >
> > 3057 He Zhenxing 2010-05-24
> > BUG#52748 Semi-Sync ACK packet isn't check for length
> >
> > Check the length and use strncpy to make the code safer.
> >
> > modified:
> > plugin/semisync/semisync_master.cc
> > === modified file 'plugin/semisync/semisync_master.cc'
> > --- a/plugin/semisync/semisync_master.cc 2010-03-11 02:22:18 +0000
> > +++ b/plugin/semisync/semisync_master.cc 2010-05-24 02:57:37 +0000
> > @@ -1048,6 +1048,7 @@ int ReplSemiSyncMaster::readSlaveReply(N
> > const unsigned char *packet;
> > char log_file_name[FN_REFLEN];
> > my_off_t log_file_pos;
> > + ulong log_file_len = 0;
> > ulong packet_len;
> > int result = -1;
> >
> > @@ -1123,7 +1124,13 @@ int ReplSemiSyncMaster::readSlaveReply(N
> > }
> >
> > log_file_pos = uint8korr(packet + REPLY_BINLOG_POS_OFFSET);
> > - strcpy(log_file_name, (const char*)packet + REPLY_BINLOG_NAME_OFFSET);
> > + log_file_len = packet_len - REPLY_BINLOG_NAME_OFFSET;
> > + if (log_file_len > FN_REFLEN)
> > + {
> > + sql_print_error("Read semi-sync reply binlog file length too large");
> > + goto l_end;
> > + }
> > + strncpy(log_file_name, (const char*)packet + REPLY_BINLOG_NAME_OFFSET,
> log_file_len);
> >
> > if (trc_level & kTraceDetail)
> > sql_print_information("%s: Got reply (%s, %lu)",
> >
> > text/bzr-bundle type attachment
> > (bzr/zhenxing.he@stripped)
> > # Bazaar merge directive format 2 (Bazaar 0.90)
> > # revision_id: zhenxing.he@stripped
> > # target_branch: file:///media/sdb2/hezx/work/mysql/bzr/b52748/trunk-\
> > # bugfixing/
> > # testament_sha1: ec3ec5b0c6f878cf80c0045aba06ddf983f3d842
> > # timestamp: 2010-05-24 10:57:43 +0800
> > # base_revision_id: jon.hauglid@stripped\
> > # 60y19x3s9uua1rb6
> > #
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> >
>
