{"id":26,"date":"2010-04-17T17:26:45","date_gmt":"2010-04-18T02:26:45","guid":{"rendered":"\/blog\/?p=26"},"modified":"2023-09-21T09:41:24","modified_gmt":"2023-09-21T00:41:24","slug":"ld_lirbrary_path-ld_run_path","status":"publish","type":"post","link":"https:\/\/hasu0707.duckdns.org\/blog\/?p=26","title":{"rendered":"LD_LIRBRARY_PATH & LD_RUN_PATH"},"content":{"rendered":"\n1. \uc18c\ucf13\ud568\uc218 (SunOS\uc5d0\uc11c \uac1c\ubc1c\ud560\ub54c)
#include
#include

int socket(int domain, int type, int protocol);
cc [flag ... ] file ... -lsocket -lnsl [library]

type\uc740 SOCK_STREAM, SOCK_DGRAM, SOCK_RAW, SOCK_SEQPACKET, SOCK_RDM \uc774 \uc788\ub294\ub370
SOCK_RAW \uc0dd\uc18c\ucf13 \ud639\uc740 \ub0a0\uc18c\ucf13\uc774\ub77c\uace0\ud558\uba70 \uc800\uc218\uc900 \ud504\ub85c\ud1a0\ucf5c\uc744 \uc774\uc6a9\ud558\uae30 \uc704\ud574\uc11c\ub294 root \uad8c\ud55c\uc744
\uac00\uc9c0\uace0\uc788\uc5b4\uc57c \ud55c\ub2e4.
\uc774\ub807\uac8c \ucef4\ud30c\uc77c\ud55c \ubc14\uc774\ub108\ub9ac \ud30c\uc77c\uc740 setuid\ub97c \uac78\uc5b4\uc8fc\uace0 \uc77c\ubc18\uacc4\uc815 \uad8c\ud55c\uc73c\ub85c \uc2e4\ud589\ud558\uba74 \uae30\ubcf8 \ub77c\uc774\ube0c\ub7ec\ub9ac \uc774\uc678\uc758 \ud328\uc2a4\uc5d0\uc11c
\ub9c1\ud06c\ud55c \ub77c\uc774\ube0c\ub7ec\ub9ac\ub97c \ubabb\ucc3e\ub294\ub2e4\uace0 \ub098\uc628\ub2e4. \ud574\uacb0\ubc95\uc740 \ub2e4\uc74c\uacfc \uac19\ub2e4.

Compile it with the -R flag, or with LD_RUN_PATH set.

It is a security hole for setuid executables to obey LD_LIBRARY_PATH, so they
don't.

Davin.

\ucef4\ud30c\uc77c\uc2dc -R\uc635\uc158\uc73c\ub85c \ub77c\uc774\ube0c\ub7ec\ub9ac\uacbd\ub85c\ub97c \uc9c0\uc815\ud574\uc8fc\uac70\ub098
LD_RUN_PATH \ud658\uacbd\ubcc0\uc218\uc5d0 \uc801\uc5b4\uc900\ub2e4.

LD_LIBRARY_PATH has two uses. You can use it to tell ld how to look
LD_LIBRARY_PATH\ub294 \ub450\uac00\uc9c0\ub85c \uc0ac\uc6a9\ud55c\ub2e4. ld\uc5d0\uac8c \uc2e4\ud589\ud30c\uc77c\uc744 \uc704\ud574 \uc5b4\ub514\uc5d0 \uc788\ub294
for libraries when linking an executable. You can also use it to tell
\ub77c\uc774\ube0c\ub7ec\ub9ac\ub97c \ub9c1\ud06c\ud560\uc9c0 \uac00\ub974\uccd0\uc8fc\ub294\ub370 \uc0ac\uc6a9\ud560 \uc218 \uc788\ub2e4. \ub610\ud55c \ub3d9\uc801\ub9c1\ucee4\uc5d0\uac8c \uc2e4\ud589
the dynamic linker where to find libraries when you run an executable.
\ud30c\uc77c\uc774 \uc2e4\ud589\ub420\ub54c \uc5b4\ub514\uc11c \ub77c\uc774\ube0c\ub7ec\ub9ac\ub97c \ucc3e\uc544\uc57c\ud558\ub294\uc9c0 \uac00\ub974\uccd0\uc904\ub54c \uc0ac\uc6a9\ud55c\ub2e4.
For security reasons, LD_LIBRARY_PATH is ignored by the dynamic linker
\ubcf4\uc548\uc744 \uc704\ud574\uc11c, LD_LIBRARY_PATH\ub294 \ub3d9\uc801\ub9c1\ucee4\uc5d0 \uc758\ud574 \ubb34\uc2dc\ub41c\ub2e4.
when a setuid or setgid file is executed.
setuid \ub098 setgid \uac00 \uac78\ub9b0 \uc2e4\ud589\ud30c\uc77c\uc77c\ub54c

LD_RUN_PATH is used to make ld compile a library search path into an
LD_RUN_PATH \ub294 ld \ucef4\ud30c\uc77c\ub7ec\uc5d0\uac8c \ub77c\uc774\ube0c\ub7ec\ub9ac\ub97c \ucc3e\uc744 \uc704\uce58\ub97c \uac00\ub974\uccd0\uc900\ub2e4.
executable. This is what you use for setuid or setgid executables.
\uc774\uac83\uc740 setuid \ub098 setgid\uac00 \uac78\ub9b0 \ud30c\uc77c\uc744 \uc2e4\ud589\ud560\ub54c \uc0ac\uc6a9\ud55c\ub2e4.
There's a detailed discussion of the use of the two in the SVR4
\uc790\uc138\ud55c \ub450\uac00\uc9c0 \uc774\uc720\ub294 SVR4\uc5d0\uc11c
\"Programmer's Guide: ANSI C and Programming Support Tools\" Manual.
\"Programmer's Guide: ANSI C and Porgramming Support Tools\" \uba54\ub274\uc5bc\uc744 \ucc38\uace0\ud558\ub77c.

\ud655\uc778\ud558\ub294 \ubc29\ubc95
ldd -s filename
dump -Lv filename \n","protected":false},"excerpt":{"rendered":"

1. \uc18c\ucf13\ud568\uc218 (SunOS\uc5d0\uc11c \uac1c\ubc1c\ud560\ub54c)#include #include int socket(int domain, int type, int protocol);cc [flag … ] file … -lsocket -lnsl [library] type\uc740 SOCK_STREAM, SOCK_DGRAM, SOCK_RAW, SOCK_SEQPACKET, SOCK_RDM \uc774 \uc788\ub294\ub370SOCK_RAW \uc0dd\uc18c\ucf13 \ud639\uc740 \ub0a0\uc18c\ucf13\uc774\ub77c\uace0\ud558\uba70 \uc800\uc218\uc900 \ud504\ub85c\ud1a0\ucf5c\uc744 \uc774\uc6a9\ud558\uae30 \uc704\ud574\uc11c\ub294 root \uad8c\ud55c\uc744\uac00\uc9c0\uace0\uc788\uc5b4\uc57c \ud55c\ub2e4.\uc774\ub807\uac8c \ucef4\ud30c\uc77c\ud55c \ubc14\uc774\ub108\ub9ac \ud30c\uc77c\uc740 setuid\ub97c \uac78\uc5b4\uc8fc\uace0 \uc77c\ubc18\uacc4\uc815 \uad8c\ud55c\uc73c\ub85c \uc2e4\ud589\ud558\uba74 \uae30\ubcf8 \ub77c\uc774\ube0c\ub7ec\ub9ac \uc774\uc678\uc758 \ud328\uc2a4\uc5d0\uc11c\ub9c1\ud06c\ud55c \ub77c\uc774\ube0c\ub7ec\ub9ac\ub97c \ubabb\ucc3e\ub294\ub2e4\uace0 \ub098\uc628\ub2e4. \ud574\uacb0\ubc95\uc740 \ub2e4\uc74c\uacfc […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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