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https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
synced 2024-11-15 23:05:49 +01:00
Fix handling of svr4_sigsets, which are implemented in SysVR4 as a sequence
of 4 longs used as a bitmask. sv4r4_sigfillset has been broken for a while, probably since rev 1.5. This patch fixes SVR4_NSIG (i.e.: sets it to the actual number of signals, instead of the number of bits in the mask) because some SysVR4 clients honestly seem to care about whether bits in the signal mask are set for non-existant signals. Additionally, the svr4_sigfillset macro has been replaced by a fully fledged function, because the macro didn't actually work (it returned an all-ones mask, but we don't want that: we want 0's set where FreeBSD doesn't actually have a signal which is the same as an SysVR4 signal, for example). SysVR4 clients can now successfully ignore signals, although catching them remains problematic (see commit log message for rev1.13 of sys/i386/svr4/svr4_machdep.c for more info).
This commit is contained in:
Mark Newton
parent
44d6135018
commit
a2eddaf1c6
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=56046
@ -46,7 +46,6 @@
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#define svr4_sigmask(n) (1 << (((n) - 1) & 31))
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#define svr4_sigword(n) (((n) - 1) >> 5)
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#define svr4_sigemptyset(s) memset((s), 0, sizeof(*(s)))
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#define svr4_sigfillset(s) memset((s), 0xffffffff, sizeof(*(s)))
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#define svr4_sigismember(s, n) ((s)->bits[svr4_sigword(n)] & svr4_sigmask(n))
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#define svr4_sigaddset(s, n) ((s)->bits[svr4_sigword(n)] |= svr4_sigmask(n))
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@ -54,6 +53,7 @@ void svr4_to_bsd_sigaction __P((const struct svr4_sigaction *,
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struct sigaction *));
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void bsd_to_svr4_sigaction __P((const struct sigaction *,
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struct svr4_sigaction *));
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void svr4_sigfillset __P((svr4_sigset_t *));
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int bsd_to_svr4_sig[SVR4_SIGTBLSZ] = {
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SVR4_SIGHUP,
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@ -123,6 +123,18 @@ int svr4_to_bsd_sig[SVR4_SIGTBLSZ] = {
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SIGXFSZ,
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};
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void
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svr4_sigfillset(s)
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svr4_sigset_t *s;
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{
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int i;
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svr4_sigemptyset(s);
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for (i = 0; i < SVR4_NSIG; i++)
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if (svr4_to_bsd_sig[i] != 0)
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svr4_sigaddset(s, i);
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}
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void
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svr4_to_bsd_sigset(sss, bss)
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const svr4_sigset_t *sss;
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@ -131,17 +143,12 @@ svr4_to_bsd_sigset(sss, bss)
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int i, newsig;
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SIGEMPTYSET(*bss);
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bss->__bits[0] = sss->bits[0] & ~((1U << SVR4_SIGTBLSZ) - 1);
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bss->__bits[1] = sss->bits[1];
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bss->__bits[2] = sss->bits[2];
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bss->__bits[3] = sss->bits[3];
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for (i = 1; i <= SVR4_SIGTBLSZ; i++) {
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if (svr4_sigismember(sss, i)) {
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newsig = svr4_to_bsd_sig[_SIG_IDX(i)];
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for (i = 0; i < SVR4_NSIG; i++)
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if (svr4_sigismember(sss, i + 1)) {
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newsig = svr4_to_bsd_sig[i];
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if (newsig)
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SIGADDSET(*bss, newsig);
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}
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}
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}
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void
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@ -259,6 +266,10 @@ svr4_sys_sigaction(p, uap)
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caddr_t sg;
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int error;
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DPRINTF(("@@@ svr4_sys_sigaction(%d, %d, %d)\n", p->p_pid,
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SCARG(uap, signum),
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SVR4_SVR42BSD_SIG(SCARG(uap, signum))));
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sg = stackgap_init();
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nisa = SCARG(uap, nsa);
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oisa = SCARG(uap, osa);
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@ -278,6 +289,16 @@ svr4_sys_sigaction(p, uap)
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} else
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nbsa = NULL;
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#if defined(DEBUG_SVR4)
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{
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int i;
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for (i = 0; i < 4; i++)
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DPRINTF(("\tssa_mask[%d] = %lx\n", i,
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nisa->ssa_mask.bits[i]));
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DPRINTF(("\tssa_handler = %lx\n", nisa->ssa_handler));
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}
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#endif
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SCARG(&sa, sig) = SVR4_SVR42BSD_SIG(SCARG(uap, signum));
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SCARG(&sa, act) = nbsa;
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SCARG(&sa, oact) = obsa;
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@ -353,11 +374,12 @@ svr4_sys_signal(p, uap)
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struct svr4_sys_signal_args *uap;
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{
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int signum;
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int error, *retval;
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int error, *retval = p->p_retval;
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caddr_t sg = stackgap_init();
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DPRINTF(("@@@ svr4_sys_signal(%d)\n", p->p_pid));
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signum = SVR4_SVR42BSD_SIG(SVR4_SIGNO(SCARG(uap, signum)));
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retval = p->p_retval;
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if (signum <= 0 || signum > SVR4_NSIG)
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return (EINVAL);
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@ -530,6 +552,7 @@ svr4_sys_sigpending(p, uap)
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int *retval;
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svr4_sigset_t sss;
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DPRINTF(("@@@ svr4_sys_sigpending(%d)\n", p->p_pid));
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retval = p->p_retval;
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switch (SCARG(uap, what)) {
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case 1: /* sigpending */
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@ -542,6 +565,13 @@ svr4_sys_sigpending(p, uap)
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case 2: /* sigfillset */
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svr4_sigfillset(&sss);
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#if defined(DEBUG_SVR4)
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{
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int i;
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for (i = 0; i < 4; i++)
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DPRINTF(("new sigset[%d] = %lx\n", i, (long)sss.bits[i]));
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}
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#endif
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break;
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default:
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@ -605,9 +635,15 @@ svr4_sys_context(p, uap)
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DPRINTF(("setcontext(%p)\n", uap->uc));
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if ((error = copyin(uap->uc, &uc, sizeof(uc))) != 0)
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return error;
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DPRINTF(("uc_flags = %x\n", uc.uc_flags));
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DPRINTF(("uc_sigmask = %x\n", uc.uc_sigmask));
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DPRINTF(("uc_flags = %lx\n", uc.uc_flags));
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#if defined(DEBUG_SVR4)
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{
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int i;
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for (i = 0; i < 4; i++)
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DPRINTF(("uc_sigmask[%d] = %lx\n", i,
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uc.uc_sigmask.bits[i]));
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}
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#endif
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return svr4_setcontext(p, &uc);
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default:
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@ -68,7 +68,7 @@
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#define SVR4_SIGPROF 29
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#define SVR4_SIGXCPU 30
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#define SVR4_SIGXFSZ 31
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#define SVR4_NSIG 128
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#define SVR4_NSIG 32
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#define SVR4_SIGTBLSZ 31
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#define SVR4_SIGNO_MASK 0x00FF
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@ -46,7 +46,6 @@
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#define svr4_sigmask(n) (1 << (((n) - 1) & 31))
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#define svr4_sigword(n) (((n) - 1) >> 5)
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#define svr4_sigemptyset(s) memset((s), 0, sizeof(*(s)))
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#define svr4_sigfillset(s) memset((s), 0xffffffff, sizeof(*(s)))
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#define svr4_sigismember(s, n) ((s)->bits[svr4_sigword(n)] & svr4_sigmask(n))
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#define svr4_sigaddset(s, n) ((s)->bits[svr4_sigword(n)] |= svr4_sigmask(n))
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@ -54,6 +53,7 @@ void svr4_to_bsd_sigaction __P((const struct svr4_sigaction *,
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struct sigaction *));
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void bsd_to_svr4_sigaction __P((const struct sigaction *,
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struct svr4_sigaction *));
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void svr4_sigfillset __P((svr4_sigset_t *));
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int bsd_to_svr4_sig[SVR4_SIGTBLSZ] = {
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SVR4_SIGHUP,
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@ -123,6 +123,18 @@ int svr4_to_bsd_sig[SVR4_SIGTBLSZ] = {
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SIGXFSZ,
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};
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void
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svr4_sigfillset(s)
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svr4_sigset_t *s;
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{
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int i;
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svr4_sigemptyset(s);
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for (i = 0; i < SVR4_NSIG; i++)
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if (svr4_to_bsd_sig[i] != 0)
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svr4_sigaddset(s, i);
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}
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void
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svr4_to_bsd_sigset(sss, bss)
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const svr4_sigset_t *sss;
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@ -131,17 +143,12 @@ svr4_to_bsd_sigset(sss, bss)
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int i, newsig;
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SIGEMPTYSET(*bss);
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bss->__bits[0] = sss->bits[0] & ~((1U << SVR4_SIGTBLSZ) - 1);
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bss->__bits[1] = sss->bits[1];
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bss->__bits[2] = sss->bits[2];
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bss->__bits[3] = sss->bits[3];
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for (i = 1; i <= SVR4_SIGTBLSZ; i++) {
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if (svr4_sigismember(sss, i)) {
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newsig = svr4_to_bsd_sig[_SIG_IDX(i)];
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for (i = 0; i < SVR4_NSIG; i++)
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if (svr4_sigismember(sss, i + 1)) {
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newsig = svr4_to_bsd_sig[i];
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if (newsig)
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SIGADDSET(*bss, newsig);
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}
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}
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}
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void
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@ -259,6 +266,10 @@ svr4_sys_sigaction(p, uap)
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caddr_t sg;
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int error;
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DPRINTF(("@@@ svr4_sys_sigaction(%d, %d, %d)\n", p->p_pid,
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SCARG(uap, signum),
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SVR4_SVR42BSD_SIG(SCARG(uap, signum))));
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sg = stackgap_init();
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nisa = SCARG(uap, nsa);
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oisa = SCARG(uap, osa);
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@ -278,6 +289,16 @@ svr4_sys_sigaction(p, uap)
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} else
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nbsa = NULL;
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#if defined(DEBUG_SVR4)
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{
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int i;
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for (i = 0; i < 4; i++)
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DPRINTF(("\tssa_mask[%d] = %lx\n", i,
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nisa->ssa_mask.bits[i]));
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DPRINTF(("\tssa_handler = %lx\n", nisa->ssa_handler));
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}
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#endif
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SCARG(&sa, sig) = SVR4_SVR42BSD_SIG(SCARG(uap, signum));
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SCARG(&sa, act) = nbsa;
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SCARG(&sa, oact) = obsa;
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@ -353,11 +374,12 @@ svr4_sys_signal(p, uap)
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struct svr4_sys_signal_args *uap;
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{
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int signum;
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int error, *retval;
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int error, *retval = p->p_retval;
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caddr_t sg = stackgap_init();
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DPRINTF(("@@@ svr4_sys_signal(%d)\n", p->p_pid));
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signum = SVR4_SVR42BSD_SIG(SVR4_SIGNO(SCARG(uap, signum)));
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retval = p->p_retval;
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if (signum <= 0 || signum > SVR4_NSIG)
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return (EINVAL);
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@ -530,6 +552,7 @@ svr4_sys_sigpending(p, uap)
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int *retval;
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svr4_sigset_t sss;
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DPRINTF(("@@@ svr4_sys_sigpending(%d)\n", p->p_pid));
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retval = p->p_retval;
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switch (SCARG(uap, what)) {
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case 1: /* sigpending */
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@ -542,6 +565,13 @@ svr4_sys_sigpending(p, uap)
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case 2: /* sigfillset */
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svr4_sigfillset(&sss);
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#if defined(DEBUG_SVR4)
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{
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int i;
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for (i = 0; i < 4; i++)
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DPRINTF(("new sigset[%d] = %lx\n", i, (long)sss.bits[i]));
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}
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#endif
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break;
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default:
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@ -605,9 +635,15 @@ svr4_sys_context(p, uap)
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DPRINTF(("setcontext(%p)\n", uap->uc));
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if ((error = copyin(uap->uc, &uc, sizeof(uc))) != 0)
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return error;
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DPRINTF(("uc_flags = %x\n", uc.uc_flags));
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DPRINTF(("uc_sigmask = %x\n", uc.uc_sigmask));
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DPRINTF(("uc_flags = %lx\n", uc.uc_flags));
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#if defined(DEBUG_SVR4)
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{
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int i;
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for (i = 0; i < 4; i++)
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DPRINTF(("uc_sigmask[%d] = %lx\n", i,
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uc.uc_sigmask.bits[i]));
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}
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#endif
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return svr4_setcontext(p, &uc);
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default:
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@ -68,7 +68,7 @@
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#define SVR4_SIGPROF 29
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#define SVR4_SIGXCPU 30
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#define SVR4_SIGXFSZ 31
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#define SVR4_NSIG 128
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#define SVR4_NSIG 32
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#define SVR4_SIGTBLSZ 31
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#define SVR4_SIGNO_MASK 0x00FF
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