diff options
Diffstat (limited to 'bin/sh/eval.c')
| -rw-r--r-- | bin/sh/eval.c | 32 |
1 files changed, 27 insertions, 5 deletions
diff --git a/bin/sh/eval.c b/bin/sh/eval.c index 903f783..25c3fcf 100644 --- a/bin/sh/eval.c +++ b/bin/sh/eval.c @@ -643,7 +643,31 @@ out: result->fd, result->buf, result->nleft, result->jp)); } - +/* + * Check if a builtin can safely be executed in the same process, + * even though it should be in a subshell (command substitution). + * Note that jobid, jobs, times and trap can show information not + * available in a child process; this is deliberate. + * The arguments should already have been expanded. + */ +static int +safe_builtin(int idx, int argc, char **argv) +{ + if (idx == BLTINCMD || idx == COMMANDCMD || idx == ECHOCMD || + idx == FALSECMD || idx == JOBIDCMD || idx == JOBSCMD || + idx == KILLCMD || idx == PRINTFCMD || idx == PWDCMD || + idx == TESTCMD || idx == TIMESCMD || idx == TRUECMD || + idx == TYPECMD) + return (1); + if (idx == EXPORTCMD || idx == TRAPCMD || idx == ULIMITCMD || + idx == UMASKCMD) + return (argc <= 1 || (argc == 2 && argv[1][0] == '-')); + if (idx == SETCMD) + return (argc <= 1 || (argc == 2 && (argv[1][0] == '-' || + argv[1][0] == '+') && argv[1][1] == 'o' && + argv[1][2] == '\0')); + return (0); +} /* * Execute a simple command. @@ -861,10 +885,8 @@ evalcommand(union node *cmd, int flags, struct backcmd *backcmd) || ((cmdentry.cmdtype == CMDNORMAL || cmdentry.cmdtype == CMDUNKNOWN) && ((flags & EV_EXIT) == 0 || have_traps())) || ((flags & EV_BACKCMD) != 0 - && (cmdentry.cmdtype != CMDBUILTIN - || cmdentry.u.index == CDCMD - || cmdentry.u.index == DOTCMD - || cmdentry.u.index == EVALCMD))) { + && (cmdentry.cmdtype != CMDBUILTIN || + !safe_builtin(cmdentry.u.index, argc, argv)))) { jp = makejob(cmd, 1); mode = cmd->ncmd.backgnd; if (flags & EV_BACKCMD) { |
