Date: Thu, 2 Apr 2020 14:26:08 +0800
From: "movead.li@highgo.ca" <movead.li@highgo.ca>
To: "Tom Lane" <tgl@sss.pgh.pa.us>
Cc: ashutosh.bapat <ashutosh.bapat@2ndquadrant.com>,
	pgsql-hackers <pgsql-hackers@lists.postgresql.org>
Subject: Re: A bug when use get_bit() function for a long bytea string
References: <20200312115135445367128@highgo.ca>,
	<CAExHW5vUSi4-oPvgMdFWvzuyaTmMtbY=JgdZ+u3T7ZdzQmubig@mail.gmail.com>,
	<20200313111842791351178@highgo.ca>,
	<CAG-ACPXeQEuvdVBzz+NWgFYoBNwcJfv1W=pJExp4LM_3fgar6w@mail.gmail.com>,
	<2020031810480643107833@highgo.ca>,
	<CAG-ACPUbQwpCHhn_KkLAGEc08A91yZhARazj2BGjXvK+eFCVog@mail.gmail.com>,
	<2020032817093521193529@highgo.ca>,
	<CAG-ACPWtjb2y5RaoWP8f76OmvSvNP3xwT82spa9VDLkNJEOdDg@mail.gmail.com>,
	<2020040111593809632067@highgo.ca>,
	<20077.1585757544@sss.pgh.pa.us>
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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charse=
t=3DISO-8859-1"><style>body { line-height: 1.5; }blockquote { margin-top: =
0px; margin-bottom: 0px; margin-left: 0.5em; }body { font-size: 10.5pt; fo=
nt-family: 'Microsoft YaHei UI'; color: rgb(0, 0, 0); line-height: 1.5; }<=
/style></head><body>=0A<div><span></span><br></div><div><div>&gt;I don't t=
hink this has really solved the overflow hazards.&nbsp; For example,</div>=
<div><span style=3D"font-size: 10.5pt; line-height: 1.5; background-color:=
 transparent;">&gt;</span>in binary_encode we've got</div><div>&nbsp;</div=
><div><span style=3D"font-size: 10.5pt; line-height: 1.5; background-color=
: transparent;">&gt;</span>resultlen =3D enc-&gt;encode_len(VARDATA_ANY(da=
ta), datalen);</div><div><span style=3D"font-size: 10.5pt; line-height: 1.=
5; background-color: transparent;">&gt;</span>result =3D palloc(VARHDRSZ +=
 resultlen);</div><div>&nbsp;</div><div><span style=3D"font-size: 10.5pt; =
line-height: 1.5; background-color: transparent;">&gt;</span>and all you'v=
e done about that is changed resultlen from int to int64.</div><div><span =
style=3D"font-size: 10.5pt; line-height: 1.5; background-color: transparen=
t;">&gt;</span>On a 64-bit machine, sure, palloc will be able to detect if=
 the</div><div><span style=3D"font-size: 10.5pt; line-height: 1.5; backgro=
und-color: transparent;">&gt;</span>result exceeds what can be allocated -=
-- but on a 32-bit machine</div><div><span style=3D"font-size: 10.5pt; lin=
e-height: 1.5; background-color: transparent;">&gt;</span>it'd be possible=
 for the size_t argument to overflow altogether.</div><div><span style=3D"=
font-size: 10.5pt; line-height: 1.5; background-color: transparent;">&gt;<=
/span>(Or if you want to argue that it can't overflow because no encoder</=
div><div><span style=3D"font-size: 10.5pt; line-height: 1.5; background-co=
lor: transparent;">&gt;</span>expands the data more than 4X, then we don't=
 need to be making this</div><div><span style=3D"font-size: 10.5pt; line-h=
eight: 1.5; background-color: transparent;">&gt;</span>change at all.)</di=
v><div>&nbsp;</div><div><span style=3D"font-size: 10.5pt; line-height: 1.5=
; background-color: transparent;">&gt;</span>I<span style=3D"font-size: 10=
.5pt; line-height: 1.5; background-color: transparent;">&nbsp;don't think =
there's really any way to do that safely without an</span></div><div><span=
 style=3D"font-size: 10.5pt; line-height: 1.5; background-color: transpare=
nt;">&gt;</span>explicit check before we call palloc.</div><div><div>I am =
sorry I do not very understand these words, and especially</div><div>what'=
s the mean by 'size_t'.&nbsp;</div><div>Here I change resultlen from int t=
o int64, is because we can get a right</div><div>error report value other =
than '-1' or another strange number.</div></div><div><br></div><div><br></=
div><div>&nbsp;</div><div><span style=3D"font-size: 10.5pt; line-height: 1=
.5; background-color: transparent;">&gt;</span>Why did you change the outp=
uts from unsigned to signed?&nbsp; Why didn't</div><div><span style=3D"fon=
t-size: 10.5pt; line-height: 1.5; background-color: transparent;">&gt;</sp=
an>you change the dlen inputs?&nbsp; I grant that we know that the input</=
div><div><span style=3D"font-size: 10.5pt; line-height: 1.5; background-co=
lor: transparent;">&gt;</span>can't exceed 1GB in Postgres' usage, but the=
se signatures are just</div><div><span style=3D"font-size: 10.5pt; line-he=
ight: 1.5; background-color: transparent;">&gt;</span>r<span style=3D"font=
-size: 10.5pt; line-height: 1.5; background-color: transparent;">andomly i=
nconsistent, and you didn't even add a comment explaining</span></div><div=
><span style=3D"font-size: 10.5pt; line-height: 1.5; background-color: tra=
nsparent;">&gt;</span>why.&nbsp; Personally I think I'd make them like</di=
v><div><span style=3D"font-size: 10.5pt; line-height: 1.5; background-colo=
r: transparent;">&gt;</span>uint64	(*encode_len) (const char *data, size_t=
 dlen);</div><div><span style=3D"font-size: 10.5pt; line-height: 1.5; back=
ground-color: transparent;">&gt;</span>which makes it explicit that the dl=
en argument describes the length</div><div><span style=3D"font-size: 10.5p=
t; line-height: 1.5; background-color: transparent;">&gt;</span>of a chunk=
 of allocated memory, while the result might exceed that.</div><div>I thin=
k it makes sence and followed.</div><div>&nbsp;</div><div><span style=3D"f=
ont-size: 10.5pt; line-height: 1.5; background-color: transparent;">&gt;</=
span>Lastly, there is a component of this that can be back-patched and</di=
v><div><span style=3D"font-size: 10.5pt; line-height: 1.5; background-colo=
r: transparent;">&gt;</span>a component that can't --- we do not change sy=
stem catalog contents</div><div><span style=3D"font-size: 10.5pt; line-hei=
ght: 1.5; background-color: transparent;">&gt;</span>in released branches.=
&nbsp; Cramming both parts into the same patch</div><div><span style=3D"fo=
nt-size: 10.5pt; line-height: 1.5; background-color: transparent;">&gt;</s=
pan>is forcing the committer to pull them apart, which is kind of</div><di=
v><span style=3D"font-size: 10.5pt; line-height: 1.5; background-color: tr=
ansparent;">&gt;</span>unfriendly.</div></div><div><div>Sorry about that, =
attached is the changed patch for PG13, and the one</div><div>for older&nb=
sp;<span style=3D"font-size: 10.5pt; line-height: 1.5; background-color: t=
ransparent;">branches will send sooner.</span></div></div>=0A<div><br></di=
v><hr style=3D"width: 210px; height: 1px;" color=3D"#b5c4df" size=3D"1" al=
ign=3D"left">=0A<div><span><div style=3D"MARGIN: 10px; FONT-FAMILY: verdan=
a; FONT-SIZE: 10pt"><span style=3D"color: rgb(13, 10, 11); font-family: mo=
nospace, monospace; font-size: 10.7333px; font-variant-ligatures: normal; =
orphans: 2; white-space: pre-wrap; widows: 2;">Regards,</span></div><div s=
tyle=3D"MARGIN: 10px; FONT-FAMILY: verdana; FONT-SIZE: 10pt"><span style=
=3D"color: rgb(13, 10, 11); font-family: monospace, monospace; font-size: =
10.7333px; font-variant-ligatures: normal; orphans: 2; white-space: pre-wr=
ap; widows: 2;">Highgo Software (Canada/China/Pakistan) </span><br style=
=3D"box-sizing: border-box; color: rgb(13, 10, 11); font-family: monospace=
, monospace; font-size: 10.7333px; font-variant-ligatures: normal; orphans=
: 2; white-space: pre-wrap; widows: 2;"><span style=3D"color: rgb(13, 10, =
11); font-family: monospace, monospace; font-size: 10.7333px; font-variant=
-ligatures: normal; orphans: 2; white-space: pre-wrap; widows: 2;">URL : <=
/span><a href=3D"http://www.highgo.ca/" rel=3D"nofollow" style=3D"box-sizi=
ng: border-box; color: rgb(132, 0, 50); text-decoration: none; font-weight=
: 600; transition: color 0.2s ease-in-out 0s; font-family: monospace, mono=
space; font-size: 10.7333px; font-variant-ligatures: normal; orphans: 2; w=
hite-space: pre-wrap; widows: 2;">www.highgo.ca</a><span style=3D"color: r=
gb(13, 10, 11); font-family: monospace, monospace; font-size: 10.7333px; f=
ont-variant-ligatures: normal; orphans: 2; white-space: pre-wrap; widows: =
2;"> </span><br style=3D"box-sizing: border-box; color: rgb(13, 10, 11); f=
ont-family: monospace, monospace; font-size: 10.7333px; font-variant-ligat=
ures: normal; orphans: 2; white-space: pre-wrap; widows: 2;"><span style=
=3D"color: rgb(13, 10, 11); font-family: monospace, monospace; font-size: =
10.7333px; font-variant-ligatures: normal; orphans: 2; white-space: pre-wr=
ap; widows: 2;">EMAIL: mailto:movead(dot)li(at)highgo(dot)ca</span></div><=
/span></div><blockquote style=3D"margin-Top: 0px; margin-Bottom: 0px; marg=
in-Left: 0.5em"><div>=0A</div></blockquote>=0A</body></html>
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