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Don't touch groups with -Z root. #1209

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Don't touch groups with -Z root. #1209

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5 changes: 4 additions & 1 deletion tcpdump.c
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Original file line number Diff line number Diff line change
Expand Up @@ -724,7 +724,10 @@ droproot(const char *username, const char *chroot_dir)
fprintf(stderr, "dropped privs to %s\n", username);
}
#else
if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||

if ((pw->pw_gid == 0) && (pw->pw_uid == 0))
fprintf(stderr, "requested to not drop privs\n");
else if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||
setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0)
error("Couldn't change to '%.32s' uid=%lu gid=%lu: %s",
username,
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