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linux(4): Properly build argument list for the signal handler

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Provide arguments 2 and 3 if signal handler installed with SA_SIGINFO.

MFC after:		2 weeks
This commit is contained in:
Dmitry Chagin 2022-05-30 19:53:12 +03:00
parent c30a767c6f
commit 109fd18ad9
2 changed files with 27 additions and 17 deletions
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32
sys/amd64/linux/linux_sysvec.c
View File

@ -558,13 +558,14 @@ linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
caddr_t sp;
struct trapframe *regs;
int sig, code;
int oonstack;
int oonstack, issiginfo;
td = curthread;
p = td->td_proc;
PROC_LOCK_ASSERT(p, MA_OWNED);
sig = linux_translate_traps(ksi->ksi_signo, ksi->ksi_trapno);
psp = p->p_sigacts;
issiginfo = SIGISMEMBER(psp->ps_siginfo, sig);
code = ksi->ksi_code;
mtx_assert(&psp->ps_mtx, MA_OWNED);
regs = td->td_frame;
@ -616,22 +617,14 @@ linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
/* Align to 16 bytes. */
sfp = (struct l_rt_sigframe *)((unsigned long)sp & ~0xFul);
/* Translate the signal. */
sig = bsd_to_linux_signal(sig);
/* Build the argument list for the signal handler. */
regs->tf_rdi = sig; /* arg 1 in %rdi */
regs->tf_rax = 0;
regs->tf_rsi = (register_t)&sfp->sf_si; /* arg 2 in %rsi */
regs->tf_rdx = (register_t)&sfp->sf_uc; /* arg 3 in %rdx */
regs->tf_rcx = (register_t)catcher;
/* Fill in POSIX parts. */
siginfo_to_lsiginfo(&ksi->ksi_info, &sf.sf_si, sig);
mtx_unlock(&psp->ps_mtx);
PROC_UNLOCK(p);
/* Translate the signal. */
sig = bsd_to_linux_signal(sig);
/* Fill in POSIX parts. */
siginfo_to_lsiginfo(&ksi->ksi_info, &sf.sf_si, sig);
/* Copy the sigframe out to the user's stack. */
if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
uprintf("pid %d comm %s has trashed its stack, killing\n",
@ -640,6 +633,17 @@ linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
sigexit(td, SIGILL);
}
/* Build the argument list for the signal handler. */
regs->tf_rdi = sig; /* arg 1 in %rdi */
regs->tf_rax = 0;
if (issiginfo) {
regs->tf_rsi = (register_t)&sfp->sf_si; /* arg 2 in %rsi */
regs->tf_rdx = (register_t)&sfp->sf_uc; /* arg 3 in %rdx */
} else {
regs->tf_rsi = 0;
regs->tf_rdx = 0;
}
regs->tf_rcx = (register_t)catcher;
regs->tf_rsp = (long)sfp;
regs->tf_rip = linux_rt_sigcode;
regs->tf_rflags &= ~(PSL_T | PSL_D);

12
sys/arm64/linux/linux_sysvec.c
View File

@ -430,7 +430,7 @@ linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
ucontext_t uc;
uint8_t *scr;
struct sigacts *psp;
int onstack, sig;
int onstack, sig, issiginfo;
td = curthread;
p = td->td_proc;
@ -442,6 +442,7 @@ linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
tf = td->td_frame;
onstack = sigonstack(tf->tf_sp);
issiginfo = SIGISMEMBER(psp->ps_siginfo, sig);
CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm,
catcher, sig);
@ -528,8 +529,13 @@ linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
free(frame, M_LINUX);
tf->tf_x[0]= sig;
tf->tf_x[1] = (register_t)&fp->sf.sf_si;
tf->tf_x[2] = (register_t)&fp->sf.sf_uc;
if (issiginfo) {
tf->tf_x[1] = (register_t)&fp->sf.sf_si;
tf->tf_x[2] = (register_t)&fp->sf.sf_uc;
} else {
tf->tf_x[1] = 0;
tf->tf_x[2] = 0;
}
tf->tf_x[8] = (register_t)catcher;
tf->tf_sp = (register_t)fp;
tf->tf_elr = (register_t)linux_vdso_sigcode;