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cd - shouldn't ignore $OLDPWD when in a new scope (#249)
This bug was first reported at <https://github.com/att/ast/issues/8>. The 'cd' command currently takes the value of $OLDPWD from the wrong scope. In the following example 'cd -' will change the directory to /bin instead of /tmp: $ OLDPWD=/bin ksh93 -c 'OLDPWD=/tmp cd -' /bin src/cmd/ksh93/bltins/cd_pwd.c: - Use sh_scoped() to obtain the correct value of $OLDPWD. - Fix a use-after-free bug. Make the 'oldpwd' variable a static char that points to freeable memory. Each time cd is used, this variable is freed if it points to a freeable memory address and isn't also a pointer to shp->pwd. src/cmd/ksh93/sh/path.c: path_pwd(): - Simplify and add comments. - Scope $PWD properly. src/cmd/ksh93/tests/builtins.sh, src/cmd/ksh93/tests/leaks.sh: - Backport the ksh2020 regression tests for 'cd -' when $OLDPWD is set. - Add test for $OLDPWD and $PWD after subshare. - Add test for $PWD after 'cd'. - Add test for possible memory leak. - Add testing for 'unset' on OLDPWD and PWD. src/cmd/ksh93/COMPATIBILITY: - Add compatibility note about changes to $PWD and $OLDPWD. Co-authored-by: Martijn Dekker <martijn@inlv.org>
This commit is contained in:
Johnothan King
GitHub
parent
ed478ab7e3
commit
ca2443b58c
7 changed files with 148 additions and 41 deletions
8
NEWS
8
NEWS
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@ -3,6 +3,14 @@ For full details, see the git log at: https://github.com/ksh93/ksh
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Any uppercase BUG_* names are modernish shell bug IDs.
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2021-03-31:
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- Fixed a bug that caused 'cd -' to ignore the current value of $OLDPWD
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when it's set to a different directory in a new scope.
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- Fixed a related bug that caused ksh to use the wrong value for $PWD
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when in a new scope.
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2021-03-29:
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- Fixed an intermittent crash that could occur in vi mode when using the 'b'
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@ -111,6 +111,12 @@ For more details, see the NEWS file and for complete details, see the git log.
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Turning on the new --globcasedetect shell option restores
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case-insensitive globbing for case-insensitive file systems.
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22. If $PWD or $OLDPWD are passed as invocation-local assignments to cd,
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their values are no longer altered in the outer scope when cd finishes.
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For example:
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ksh -c 'OLDPWD=/bin; OLDPWD=/tmp cd - > /dev/null; echo $OLDPWD'
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ksh -c 'cd /var; PWD=/tmp cd /usr; echo $PWD'
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now prints '/bin' followed by '/var'.
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____________________________________________________________________________
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KSH-93 VS. KSH-88
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@ -57,7 +57,7 @@ int b_cd(int argc, char *argv[],Shbltin_t *context)
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register Shell_t *shp = context->shp;
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int saverrno=0;
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int rval,flag=0;
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char *oldpwd;
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static char *oldpwd;
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Namval_t *opwdnod, *pwdnod;
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if(sh_isoption(SH_RESTRICTED))
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errormsg(SH_DICT,ERROR_exit(1),e_restricted+4);
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@ -81,9 +81,16 @@ int b_cd(int argc, char *argv[],Shbltin_t *context)
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dir = argv[0];
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if(error_info.errors>0 || argc >2)
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errormsg(SH_DICT,ERROR_usage(2),"%s",optusage((char*)0));
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if(oldpwd && oldpwd!=shp->pwd && oldpwd!=e_dot)
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free(oldpwd);
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oldpwd = path_pwd(shp,0);
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opwdnod = (shp->subshell?sh_assignok(OLDPWDNOD,1):OLDPWDNOD);
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pwdnod = (shp->subshell?sh_assignok(PWDNOD,1):PWDNOD);
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opwdnod = sh_scoped(shp,OLDPWDNOD);
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pwdnod = sh_scoped(shp,PWDNOD);
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if(shp->subshell)
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{
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opwdnod = sh_assignok(opwdnod,1);
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pwdnod = sh_assignok(pwdnod,1);
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}
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if(argc==2)
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dir = sh_substitute(oldpwd,dir,argv[1]);
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else if(!dir)
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@ -216,8 +223,6 @@ success:
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nv_scan(sh_subtracktree(1),rehash,(void*)0,NV_TAGGED,NV_TAGGED);
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path_newdir(shp,shp->pathlist);
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path_newdir(shp,shp->cdpathlist);
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if(oldpwd && oldpwd!=e_dot)
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free(oldpwd);
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return(0);
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}
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@ -20,7 +20,7 @@
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#define SH_RELEASE_FORK "93u+m" /* only change if you develop a new ksh93 fork */
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#define SH_RELEASE_SVER "1.0.0-alpha" /* semantic version number: https://semver.org */
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#define SH_RELEASE_DATE "2021-03-29" /* must be in this format for $((.sh.version)) */
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#define SH_RELEASE_DATE "2021-03-31" /* must be in this format for $((.sh.version)) */
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#define SH_RELEASE_CPYR "(c) 2020-2021 Contributors to ksh " SH_RELEASE_FORK
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/* Scripts sometimes field-split ${.sh.version}, so don't change amount of whitespace. */
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@ -244,49 +244,35 @@ static pid_t path_xargs(Shell_t *shp,const char *path, char *argv[],char *const
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char *path_pwd(Shell_t *shp,int flag)
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{
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register char *cp;
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register int count = 0;
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Namval_t *pwdnod;
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NOT_USED(flag);
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/* Don't bother if PWD already set */
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if(shp->pwd)
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return((char*)shp->pwd);
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while(1)
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/* First see if PWD variable is correct */
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pwdnod = sh_scoped(shp,PWDNOD);
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cp = nv_getval(pwdnod);
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if(!(cp && *cp=='/' && test_inode(cp,e_dot)))
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{
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/* try from lowest to highest */
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switch(count++)
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/* Check if $HOME is a path to the PWD; this ensures $PWD == $HOME
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at login, even if $HOME is a path that contains symlinks */
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cp = nv_getval(sh_scoped(shp,HOME));
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if(!(cp && *cp=='/' && test_inode(cp,e_dot)))
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{
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case 0:
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cp = nv_getval(PWDNOD);
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break;
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case 1:
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cp = nv_getval(HOME);
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break;
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case 2:
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cp = "/";
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break;
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case 3:
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{
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if(cp=getcwd(NIL(char*),0))
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{
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nv_offattr(PWDNOD,NV_NOFREE);
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_nv_unset(PWDNOD,0);
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PWDNOD->nvalue.cp = cp;
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goto skip;
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}
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break;
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}
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case 4:
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/* Get physical PWD (no symlinks) using getcwd(3), fall back to "." */
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cp = getcwd(NIL(char*),0);
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if(!cp)
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return((char*)e_dot);
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}
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if(cp && *cp=='/' && test_inode(cp,e_dot))
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break;
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/* Store in PWD variable */
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if(shp->subshell)
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pwdnod = sh_assignok(pwdnod,1);
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nv_offattr(pwdnod,NV_NOFREE);
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nv_putval(pwdnod,cp,NV_RDONLY);
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}
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if(count>1)
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{
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nv_offattr(PWDNOD,NV_NOFREE);
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nv_putval(PWDNOD,cp,NV_RDONLY);
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}
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skip:
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nv_onattr(PWDNOD,NV_NOFREE|NV_EXPORT);
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shp->pwd = (char*)(PWDNOD->nvalue.cp);
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nv_onattr(pwdnod,NV_NOFREE|NV_EXPORT);
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/* Set shell PWD */
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shp->pwd = (char*)(pwdnod->nvalue.cp);
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return(cp);
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}
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@ -1059,5 +1059,85 @@ got=$?
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exp=1
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[[ $got == $exp ]] || err_exit "'kill %' has the wrong exit status (expected '$exp'; got '$got')"
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# ======
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# 'cd -' should recognize the value of an overriden $OLDPWD variable
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# https://github.com/ksh93/ksh/pull/249
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# https://github.com/att/ast/issues/8
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mkdir "$tmp/oldpwd" "$tmp/otherpwd"
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exp=$tmp/oldpwd
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OLDPWD=$exp
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cd - > /dev/null
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got=$PWD
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[[ $got == "$exp" ]] || err_exit "cd - doesn't recognize overridden OLDPWD variable" \
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"(expected $(printf %q "$exp"), got $(printf %q "$got"))"
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cd "$tmp"
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OLDPWD=$tmp/otherpwd
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got=$(OLDPWD=$tmp/oldpwd cd -)
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[[ $got == "$exp" ]] ||
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err_exit "cd - doesn't recognize overridden OLDPWD variable if it is overridden in new scope" \
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"(expected $(printf %q "$exp"), got $(printf %q "$got"))"
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function fn
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{
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typeset OLDPWD=/tmp
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cd -
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}
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exp='/tmp'
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got=$(OLDPWD=/bin fn)
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[[ $got == "$exp" ]] ||
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err_exit "cd - doesn't recognize overridden OLDPWD variable if it is overridden in function scope" \
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"(expected $(printf %q "$exp"), got $(printf %q "$got"))"
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function fn
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{
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typeset PWD=bug
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cd /tmp
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echo "$PWD"
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}
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exp='/tmp'
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got=$(fn)
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[[ $got == "$exp" ]] ||
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err_exit "PWD isn't set after cd if already set in function scope" \
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"(expected $(printf %q "$exp"), got $(printf %q "$got"))"
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# $PWD should be set correctly after cd
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exp="$PWD
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$PWD"
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got=$(echo $PWD; PWD=/tmp cd /home; echo $PWD)
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[[ $got == "$exp" ]] ||
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err_exit "PWD is incorrect after cd" \
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"(expected $(printf %q "$exp"), got $(printf %q "$got"))"
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# Test for $OLDPWD and/or $PWD leaking out of subshell
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exp='/tmp /dev'
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got=$(
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PWD=/dev
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OLDPWD=/tmp
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(
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cd /usr; cd /bin
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cd - > /dev/null
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)
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echo $OLDPWD $PWD
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)
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[[ $got == "$exp" ]] ||
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err_exit "OLDPWD and/or PWD leak out of subshell" \
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"(expected $(printf %q "$exp"), got $(printf %q "$got"))"
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# $OLDPWD and $PWD should survive after being set in a subshare
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exp='/usr /bin'
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got=$(
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PWD=/dev
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OLDPWD=/tmp
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foo=${
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cd /usr; cd /bin
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}
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echo $OLDPWD $PWD
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)
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[[ $got == "$exp" ]] ||
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err_exit "OLDPWD and/or PWD fail to survive subshare" \
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"(expected $(printf %q "$exp"), got $(printf %q "$got"))"
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# ======
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exit $((Errors<125?Errors:125))
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@ -417,5 +417,27 @@ after=$(getmem)
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err_exit_if_leak 'unset PATH in subshell'
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disabled
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# ======
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# Test for a memory leak after 'cd' (in relation to $PWD and $OLDPWD)
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original_pwd=$PWD
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before=$(getmem)
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for ((i=0; i < N; i++))
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do cd /tmp
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cd - > /dev/null
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PWD=/foo
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OLDPWD=/bar
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cd /bin
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cd /usr
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cd /home
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cd /home
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cd - > /dev/null
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unset OLDPWD PWD
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cd /bin
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cd /tmp
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done
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after=$(getmem)
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err_exit_if_leak 'PWD and/or OLDPWD changed by cd'
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cd $original_pwd
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# ======
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exit $((Errors<125?Errors:125))
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