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sh: Ensure OPTIND=1 in subshell without forking does not affect outer env.

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Command substitutions containing a single simple command and here-document
expansion are performed in a subshell environment, but may not fork. Any
modified state of the shell environment should be restored afterward.

The state that OPTIND=1 had been done was not saved and restored here.

Note that the other parts of shellparam need not be saved and restored,
since they are not modified in these situations (a fork is done before such
modifications).
This commit is contained in:
Jilles Tjoelker 2016-01-07 20:48:24 +00:00
parent f5b4d34104
commit adba77a62e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=293359
3 changed files with 19 additions and 0 deletions
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7
bin/sh/eval.c
View File

@ -496,10 +496,12 @@ exphere(union node *redir, struct arglist *fn)
struct jmploc *savehandler;
struct localvar *savelocalvars;
int need_longjmp = 0;
unsigned char saveoptreset;
redir->nhere.expdoc = "";
savelocalvars = localvars;
localvars = NULL;
saveoptreset = shellparam.reset;
forcelocal++;
savehandler = handler;
if (setjmp(jmploc.loc))
@ -514,6 +516,7 @@ exphere(union node *redir, struct arglist *fn)
forcelocal--;
poplocalvars();
localvars = savelocalvars;
shellparam.reset = saveoptreset;
if (need_longjmp)
longjmp(handler->loc, 1);
INTON;
@ -647,6 +650,7 @@ evalbackcmd(union node *n, struct backcmd *result)
struct jmploc jmploc;
struct jmploc *savehandler;
struct localvar *savelocalvars;
unsigned char saveoptreset;
result->fd = -1;
result->buf = NULL;
@ -661,6 +665,7 @@ evalbackcmd(union node *n, struct backcmd *result)
if (is_valid_fast_cmdsubst(n)) {
savelocalvars = localvars;
localvars = NULL;
saveoptreset = shellparam.reset;
forcelocal++;
savehandler = handler;
if (setjmp(jmploc.loc)) {
@ -671,6 +676,7 @@ evalbackcmd(union node *n, struct backcmd *result)
forcelocal--;
poplocalvars();
localvars = savelocalvars;
shellparam.reset = saveoptreset;
longjmp(handler->loc, 1);
}
} else {
@ -681,6 +687,7 @@ evalbackcmd(union node *n, struct backcmd *result)
forcelocal--;
poplocalvars();
localvars = savelocalvars;
shellparam.reset = saveoptreset;
} else {
if (pipe(pip) < 0)
error("Pipe call failed: %s", strerror(errno));

1
bin/sh/tests/builtins/Makefile
View File

@ -95,6 +95,7 @@ FILES+= getopts6.0
FILES+= getopts7.0
FILES+= getopts8.0 getopts8.0.stdout
FILES+= getopts9.0 getopts9.0.stdout
FILES+= getopts10.0
FILES+= hash1.0 hash1.0.stdout
FILES+= hash2.0 hash2.0.stdout
FILES+= hash3.0 hash3.0.stdout

11
bin/sh/tests/builtins/getopts10.0 Normal file
View File

@ -0,0 +1,11 @@
# $FreeBSD$
set -- -x arg
opt=not
getopts x opt
r1=$? OPTIND1=$OPTIND opt1=$opt
: $(: $((OPTIND = 1)))
getopts x opt
r2=$? OPTIND2=$OPTIND
[ "$r1" = 0 ] && [ "$OPTIND1" = 2 ] && [ "$opt1" = x ] && [ "$r2" != 0 ] &&
[ "$OPTIND2" = 2 ]