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Date: Sun, 7 Sep 1997 14:46:47 +0400 (MSD)
From: Andrew Maltsev <am@amsoft.ru>
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To: FreeBSD-gnats-submit@FreeBSD.ORG
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Subject: misc/4482: dynamic loader design bug
Sender: owner-freebsd-bugs@FreeBSD.ORG
X-Loop: FreeBSD.org
Precedence: bulk


>Number:         4482
>Category:       misc
>Synopsis:       A bug in dynamic loader design
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          change-request
>Submitter-Id:   current-users
>Arrival-Date:   Sun Sep  7 05:20:01 PDT 1997
>Last-Modified:
>Originator:     Andrew Maltsev
>Organization:
AM'SOFT
>Release:        FreeBSD 2.2-RELEASE i386
>Environment:

	

>Description:

 When dynamic loader places shered object into address space of an
 executable all symbols, which are presnet both in `main' executable and
 in loaded shared object, are resolved from `main'.

 It's a bug I think. They should be resolved first from object's
 internal symbols. And going deeper I think, that there should be a
 flag, by which clashed symbols in main and object should be rearranged
 to use object's ones after it's loading even if `main' has it's own
 ones. This will greatly simplify plug-in's development. Especially
 those plug-in's which are developed as a `bug-fixes' for large
 binary-distributed executables.

 Developer may say then to his customers 'just drop that bug fix into
 `bugfixes' directory and your ploblem will go away' -- nice and more
 and more demanded feature, I think.

>How-To-Repeat:

 unpack and say `make test'

begin 600 FreeBSD-dl-bug.tgz
M'XL(`)J%$C0``^V77T_;,!#`^QI_BEL!->W:D(2TD<JZ,<J8F#8QB4E[V-"6
M.BX-<V,6)PPT\=UW3MJ@5N6/6"F3YM]+G?.=[Z[.G9W]A+'=H[U6R%N#[&2S
M\AB`9_NV#14`QV_GO\CT=_(`'<_VVK;;L7U4<UQOJP+M1XEFCDRF00)0"<:W
MZ_T:,<97$=!JV9_=_W$0Q19=L@_'MCNW[+_C;+G%_GN^[SL>2ES/<RI@+SF.
MA?SG^[\6Q91G(8,7,@TC88U>DFM1R(<T5B*R%K)A%#,XW'WWIO_),*K6IAB<
M,II:4E0).1=12(9"F'7R&\Z2*$Z'9E6]2S4)*`9VP6B6LO!K7*UODRM"4(.H
M>1,'$-`FT!'N0B,X_W*LEE#K@=D89C&MFV@!A:0AQ3;!AT)9S::1B'MF0'L]
M%UX!FCO'T(7J-W2J/*%N'E4^DJ(7<G'&8K/(HNGD*T=#\YD4=1S!=>S]((Y%
M"EP$(8Q%F'$&WS=DK0L;$G-H3A8(.4L2D9CU?"&$742I62P+5[/>5;3H7UZ.
M32F:T]C+"/)4%\:`_WLXXWQJ>Q_WJ#KQCTY"3KF0#/W7%[O*IQ^>+T#"TBR)
MP59[_-1OMN8^S/7_#\$/+'3.ENKCCOX/>.Q/SW_;W[)5__?;KN[_JZ"___[U
MVR/C>0]:GP/.H37\>-`G!(==0S5H*-L\(2F3:=?`*6+L,#H24-V+$IP$BK(J
M"JW\_@"J^Y8J!W&X6&D0)*7280PU*A*E5P-Y*5,VAH%(1V@DF00Y$AD/L5MA
M9Z(,V,\LX""R]"Q+\?"AG`5QEQC)&*.'V:"A80G`E9G5(/F!4V1E46*<4`KK
M9I%_'5H"UG=@'8^ZTK9K8!YHCH%:F`\&T-J5>/*P8(#ML31XZAW\.^;J7V6\
M[.O?G?7OV)VR_MNNNO^[KM?6];\*%MS_%M_FBK*XX3[WU%EH'LI<_:M>M_+Z
MAXY_??ZWB_IW]???2KBI_LLOE[P9X&N1-X.)4!>\1J/1:#0:C4:CT6@T&HU&
.H]'\\_P!UO$)P@`H``"I
`
end

>Fix:
	
 Don't know. It may be hard to fix or not - just don't know..

>Audit-Trail:
>Unformatted: