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sh: Check setuid()/setgid() return values.

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If the -p option is turned off, privileges from a setuid or setgid binary
are dropped. Make sure to check if this succeeds. If it fails, this is an
error which will cause the shell to abort except in interactive mode or if
'command' was used to make 'set' or an outer 'eval' or '.' non-special.

Note that taking advantage of this feature and writing setuid shell scripts
seems unwise.

MFC after:	1 week
This commit is contained in:
jilles 2011-04-25 10:14:29 +00:00
parent 54847e6220
commit 836a99923b
1 changed files with 4 additions and 2 deletions
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6
bin/sh/options.c
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@ -280,8 +280,10 @@ setoption(int flag, int val)
int i;
if (flag == 'p' && !val && privileged) {
(void) setuid(getuid());
(void) setgid(getgid());
if (setgid(getgid()) == -1)
error("setgid");
if (setuid(getuid()) == -1)
error("setuid");
}
for (i = 0; i < NOPTS; i++)
if (optlist[i].letter == flag) {