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On 64-bit platforms such as x86_64, glibc is usally built with 32-bit
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compatibilty for various structures. One of them is utmp.
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What this means is that gettimeofday(&ut.ut_tv, NULL) on x86_64 will
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end up overwriting the first parts of ut_addr_v6, leading to garbage
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in the utmp file.
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--- util-linux-2.13-pre6/login-utils/login.c.kzak 2006-08-10 11:38:33.000000000 +0200
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+++ util-linux-2.13-pre6/login-utils/login.c 2006-08-10 11:38:49.000000000 +0200
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@@ -257,6 +257,7 @@
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static void
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logbtmp(const char *line, const char *username, const char *hostname) {
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struct utmp ut;
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+ struct timeval tv;
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memset(&ut, 0, sizeof(ut));
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@@ -267,7 +268,9 @@
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xstrncpy(ut.ut_line, line, sizeof(ut.ut_line));
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#if defined(_HAVE_UT_TV) /* in <utmpbits.h> included by <utmp.h> */
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- gettimeofday(&ut.ut_tv, NULL);
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+ gettimeofday(&tv, NULL);
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+ ut.ut_tv.tv_sec = tv.tv_sec;
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+ ut.ut_tv.tv_usec = tv.tv_usec;
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#else
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{
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time_t t;
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@@ -872,6 +875,7 @@
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{
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struct utmp ut;
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struct utmp *utp;
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+ struct timeval tv;
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utmpname(_PATH_UTMP);
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setutent();
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@@ -911,7 +915,9 @@
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strncpy(ut.ut_user, username, sizeof(ut.ut_user));
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xstrncpy(ut.ut_line, tty_name, sizeof(ut.ut_line));
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#ifdef _HAVE_UT_TV /* in <utmpbits.h> included by <utmp.h> */
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- gettimeofday(&ut.ut_tv, NULL);
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+ gettimeofday(&tv, NULL);
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+ ut.ut_tv.tv_sec = tv.tv_sec;
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+ ut.ut_tv.tv_usec = tv.tv_usec;
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#else
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{
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time_t t;
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