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Fix formatting of ttydev on systems with signed 32-bit dev_t

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If dev_t is 32-bit and signed, formatting as an unsigned long long
may result in a bogus value due to sign extension.
This commit is contained in:
Todd C. Miller 2024-08-13 20:07:28 -06:00
parent f3aa3f1f28
commit 46274e725e
5 changed files with 74 additions and 4 deletions
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3
config.h.in
View File

@ -1293,6 +1293,9 @@
/* Define to 1 if you want sudo to set $HOME in shell mode. */
#undef SHELL_SETS_HOME
/* The size of 'dev_t', as computed by sizeof. */
#undef SIZEOF_DEV_T
/* The size of 'id_t', as computed by sizeof. */
#undef SIZEOF_ID_T

35
configure vendored
View File

@ -21003,6 +21003,41 @@ printf "%s\n" "$ac_cv_sizeof_long_long" >&6; }
printf "%s\n" "#define SIZEOF_LONG_LONG $ac_cv_sizeof_long_long" >>confdefs.h
# The cast to long int works around a bug in the HP C Compiler
# version HP92453-01 B.11.11.23709.GP, which incorrectly rejects
# declarations like 'int a3[[(sizeof (unsigned char)) >= 0]];'.
# This bug is HP SR number 8606223364.
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking size of dev_t" >&5
printf %s "checking size of dev_t... " >&6; }
if test ${ac_cv_sizeof_dev_t+y}
then :
printf %s "(cached) " >&6
else case e in #(
e) if ac_fn_c_compute_int "$LINENO" "(long int) (sizeof (dev_t))" "ac_cv_sizeof_dev_t" "$ac_includes_default"
then :
else case e in #(
e) if test "$ac_cv_type_dev_t" = yes; then
{ { printf "%s\n" "$as_me:${as_lineno-$LINENO}: error: in '$ac_pwd':" >&5
printf "%s\n" "$as_me: error: in '$ac_pwd':" >&2;}
as_fn_error 77 "cannot compute sizeof (dev_t)
See 'config.log' for more details" "$LINENO" 5; }
else
ac_cv_sizeof_dev_t=0
fi ;;
esac
fi
;;
esac
fi
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_sizeof_dev_t" >&5
printf "%s\n" "$ac_cv_sizeof_dev_t" >&6; }
printf "%s\n" "#define SIZEOF_DEV_T $ac_cv_sizeof_dev_t" >>confdefs.h
# The cast to long int works around a bug in the HP C Compiler
# version HP92453-01 B.11.11.23709.GP, which incorrectly rejects
# declarations like 'int a3[[(sizeof (unsigned char)) >= 0]];'.

1
configure.ac
View File

@ -2507,6 +2507,7 @@ SUDO_SOCK_SA_LEN
SUDO_SOCK_SIN_LEN
AC_CHECK_SIZEOF([long])
AC_CHECK_SIZEOF([long long])
AC_CHECK_SIZEOF([dev_t])
AC_CHECK_SIZEOF([id_t])
AC_CHECK_SIZEOF([time_t])
AC_CHECK_SIZEOF([uid_t])

32
src/regress/ttyname/check_ttyname.c
View File

@ -67,10 +67,10 @@ int
main(int argc, char *argv[])
{
char *tty_libc = NULL, *tty_sudo = NULL;
int ch, errors = 0, ntests = 1;
char pathbuf[PATH_MAX];
bool verbose = false;
dev_t ttydev;
dev_t ttydev = -1;
int ch, errors = 0, ntests = 1;
initprogname(argc > 0 ? argv[0] : "check_ttyname");
@ -87,9 +87,35 @@ main(int argc, char *argv[])
/* Lookup tty name using kernel info if possible. */
ttydev = get_process_ttyname(pathbuf, sizeof(pathbuf));
if (ttydev != (dev_t)-1)
if (ttydev != (dev_t)-1) {
char numbuf[STRLEN_MAX_UNSIGNED(unsigned long long) + 1];
unsigned long long ullval;
const char *errstr;
dev_t newdev;
/* For comparison below. */
tty_sudo = pathbuf;
/* Check that we can format a dev_t as a string and parse it. */
ntests++;
#if SIZEOF_DEV_T == SIZEOF_LONG
ullval = (unsigned long)ttydev;
#else
ullval = (unsigned long long)ttydev;
#endif
(void)snprintf(numbuf, sizeof(numbuf), "%llu", ullval);
newdev = sudo_strtonum(numbuf, LLONG_MIN, LLONG_MAX, &errstr);
if (errstr != NULL) {
printf("%s: FAIL unable to parse device number %s: %s",
getprogname(), numbuf, errstr);
errors++;
} else if (ttydev != newdev) {
printf("%s: FAIL device mismatch for %s, %s != %llu",
getprogname(), pathbuf, numbuf, ullval);
errors++;
}
}
#if defined(HAVE_KINFO_PROC2_NETBSD) || \
defined(HAVE_KINFO_PROC_OPENBSD) || \
defined(HAVE_KINFO_PROC_FREEBSD) || \

7
src/sudo.c
View File

@ -620,7 +620,12 @@ get_user_info(struct user_details *ud)
ttydev = get_process_ttyname(path, sizeof(path));
if (ttydev != (dev_t)-1) {
if (asprintf(&info[++i], "ttydev=%llu", (unsigned long long)ttydev) == -1)
#if SIZEOF_DEV_T == SIZEOF_LONG
n = asprintf(&info[++i], "ttydev=%lu", (unsigned long)ttydev);
#else
n = asprintf(&info[++i], "ttydev=%llu", (unsigned long long)ttydev);
#endif
if (n == -1)
goto oom;
info[++i] = sudo_new_key_val("tty", path);
if (info[i] == NULL)