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The async-signal-safe fix used internally FD 3 and FD 4 which could conflict with options fdin,fdout
This commit is contained in:
Gerhard Rieger
parent
a3c688210f
commit
9f5abda361
5 changed files with 86 additions and 1 deletions
5
CHANGES
5
CHANGES
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@ -16,6 +16,11 @@ corrections:
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compiling with MUSL libc failed.
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Problem reported by Kennedy33.
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The async signal safe diagnostic system used FDs 3 and 4 internally, so
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use of appropriate fdin or fdout led to failures.
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Test: DIAG_FDIN
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Problem reported by Onur Sentürk.
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testing:
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test.sh: Show a warning when phase-1 (insecure phase) of a security
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test fails
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13
error.c
13
error.c
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@ -210,6 +210,19 @@ const char *diag_get_string(char what) {
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return NULL;
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}
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/* make sure that the diag_sock fds do not have this num */
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int diag_reserve_fd(int fd) {
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DIAG_INIT;
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if (diag_sock_send == fd) {
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diag_sock_send = Dup(fd);
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Close(fd);
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}
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if (diag_sock_recv == fd) {
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diag_sock_recv = Dup(fd);
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Close(fd);
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}
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return 0;
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}
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/* Linux and AIX syslog format:
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Oct 4 17:10:37 hostname socat[52798]: D signal(13, 1)
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1
error.h
1
error.h
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@ -236,6 +236,7 @@ extern void diag_set(char what, const char *arg);
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extern void diag_set_int(char what, int arg);
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extern int diag_get_int(char what);
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extern const char *diag_get_string(char what);
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extern int diag_reserve_fd(int fd);
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extern int diag_dup(void);
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extern int diag_dup2(int newfd);
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extern void msg(int level, const char *format, ...);
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42
test.sh
42
test.sh
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@ -12799,6 +12799,48 @@ esac
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PORT=$((PORT+1))
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N=$((N+1))
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# The fix to "Make code async-signal-safe" used internally FD 3 and FD 4.
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# Using option fdin=3 did not pass data to executed program.
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NAME=DIAG_FDIN
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case "$TESTS" in
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*%$N%*|*%functions%*|*%bugs%*|*%exec%*|*%$NAME%*)
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TEST="$NAME: test use of fdin=3"
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# Use FD 3 explicitely with fdin and test if Socat passes data to executed
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# program
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if ! eval $NUMCOND; then :; else
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tf="$td/test$N.stdout"
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te="$td/test$N.stderr"
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tdiff="$td/test$N.diff"
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da="test$N $(date) $RANDOM"
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CMD0="$TRACE $SOCAT $opts - SYSTEM:\"cat >&3 <&4\",fdin=4,fdout=3"
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printf "test $F_n $TEST... " $N
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echo "$da" |$TRACE $SOCAT $opts - SYSTEM:"cat <&3 >&4",fdin=3,fdout=4 >${tf}0 2>"${te}0"
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rc0=$?
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if [ $rc0 -ne 0 ]; then
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$PRINTF "$FAILED\n"
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echo "$CMD0"
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cat "${te}0"
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numFAIL=$((numFAIL+1))
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listFAIL="$listFAIL $N"
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elif echo "$da" |diff - ${tf}0 >$tdiff; then
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$PRINTF "$OK\n"
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numOK=$((numOK+1))
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else
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$PRINTF "$FAILED\n"
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echo "$CMD0"
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cat "${te}0"
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cat "$tdiff"
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numFAIL=$((numFAIL+1))
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listFAIL="$listFAIL $N"
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fi
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fi # NUMCOND
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;;
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esac
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PORT=$((PORT+1))
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N=$((N+1))
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##################################################################################
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#=================================================================================
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# here come tests that might affect your systems integrity. Put normal tests
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@ -168,7 +168,7 @@ int _xioopen_foxec(int xioflags, /* XIO_RDONLY etc. */
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}
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#endif
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/* remember: fdin is the fs where the sub program reads from, thus it is
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/* remember: fdin is the fd where the sub program reads from, thus it is
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sock0[]'s read fd */
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/*! problem: when fdi==WRFD(sock[0]) or fdo==RDFD(sock[0]) */
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if (rw != XIO_WRONLY) {
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@ -177,6 +177,9 @@ int _xioopen_foxec(int xioflags, /* XIO_RDONLY etc. */
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Warn2("fcntl(%d, F_SETFD, 0): %s", fdo, strerror(errno));
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}
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} else {
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/* make sure that the internal diagnostic socket pair fds do not conflict
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with our choices */
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diag_reserve_fd(fdo);
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if (Dup2(XIO_GETWRFD(sock[0]), fdo) < 0) {
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Error3("dup2(%d, %d): %s",
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XIO_GETWRFD(sock[0]), fdo, strerror(errno));
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@ -190,6 +193,9 @@ int _xioopen_foxec(int xioflags, /* XIO_RDONLY etc. */
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Warn2("fcntl(%d, F_SETFD, 0): %s", fdi, strerror(errno));
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}
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} else {
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/* make sure that the internal diagnostic socket pair fds do not conflict
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with our choices */
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diag_reserve_fd(fdi);
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if (Dup2(XIO_GETRDFD(sock[0]), fdi) < 0) {
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Error3("dup2(%d, %d): %s)",
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XIO_GETRDFD(sock[0]), fdi, strerror(errno));
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@ -425,12 +431,18 @@ int _xioopen_foxec(int xioflags, /* XIO_RDONLY etc. */
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if (usepty) {
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Close(ptyfd);
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if (rw != XIO_RDONLY && fdi != ttyfd) {
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/* make sure that the internal diagnostic socket pair fds do not conflict
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with our choices */
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diag_reserve_fd(fdi);
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if (Dup2(ttyfd, fdi) < 0) {
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Error3("dup2(%d, %d): %s", ttyfd, fdi, strerror(errno));
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return -1; }
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/*0 Info2("dup2(%d, %d)", ttyfd, fdi);*/
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}
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if (rw != XIO_WRONLY && fdo != ttyfd) {
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/* make sure that the internal diagnostic socket pair fds do not conflict
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with our choices */
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diag_reserve_fd(fdo);
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if (Dup2(ttyfd, fdo) < 0) {
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Error3("dup2(%d, %d): %s", ttyfd, fdo, strerror(errno));
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return -1; }
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@ -472,6 +484,9 @@ int _xioopen_foxec(int xioflags, /* XIO_RDONLY etc. */
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}
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if (rw != XIO_WRONLY && rdpip[1] != fdo) {
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/* make sure that the internal diagnostic socket pair fds do not conflict
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with our choices */
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diag_reserve_fd(fdo);
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if (Dup2(rdpip[1], fdo) < 0) {
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Error3("dup2(%d, %d): %s", rdpip[1], fdo, strerror(errno));
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return -1;
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@ -481,6 +496,9 @@ int _xioopen_foxec(int xioflags, /* XIO_RDONLY etc. */
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/*0 applyopts_cloexec(fdo, *copts);*/
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}
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if (rw != XIO_RDONLY && wrpip[0] != fdi) {
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/* make sure that the internal diagnostic socket pair fds do not conflict
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with our choices */
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diag_reserve_fd(fdi);
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if (Dup2(wrpip[0], fdi) < 0) {
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Error3("dup2(%d, %d): %s", wrpip[0], fdi, strerror(errno));
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return -1;
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@ -499,12 +517,18 @@ int _xioopen_foxec(int xioflags, /* XIO_RDONLY etc. */
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} else { /* socketpair */
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Close(sv[0]);
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if (rw != XIO_RDONLY && fdi != sv[1]) {
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/* make sure that the internal diagnostic socket pair fds do not conflict
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with our choices */
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diag_reserve_fd(fdi);
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if (Dup2(sv[1], fdi) < 0) {
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Error3("dup2(%d, %d): %s", sv[1], fdi, strerror(errno));
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return -1; }
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/*0 Info2("dup2(%d, %d)", sv[1], fdi);*/
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}
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if (rw != XIO_WRONLY && fdo != sv[1]) {
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/* make sure that the internal diagnostic socket pair fds do not conflict
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with our choices */
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diag_reserve_fd(fdo);
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if (Dup2(sv[1], fdo) < 0) {
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Error3("dup2(%d, %d): %s", sv[1], fdo, strerror(errno));
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return -1; }
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