50 lines
1.3 KiB
Diff
50 lines
1.3 KiB
Diff
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--- linux-user/syscall.c
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+++ linux-user/syscall.c
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@@ -2727,7 +2727,8 @@
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case TARGET_NR_capset:
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goto unimplemented;
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case TARGET_NR_sigaltstack:
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- goto unimplemented;
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+ ret = 0; /* good enough for most purposes */
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+ break;
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case TARGET_NR_sendfile:
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goto unimplemented;
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#ifdef TARGET_NR_getpmsg
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--- linux-user/signal.c
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+++ linux-user/signal.c
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@@ -1014,6 +1021,14 @@
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return err;
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}
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+void* hack_stack;
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+
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+void hack_handler(int signum)
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+{
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+ fprintf(stderr,"QEMU: stack overflow, aborting\n");
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+ exit(-SIGSEGV);
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+}
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+
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static inline void *
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get_sigframe(struct emulated_sigaction *ka, CPUState *regs, int framesize)
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{
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@@ -1026,6 +1041,19 @@
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if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp))
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sp = current->sas_ss_sp + current->sas_ss_size;
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#endif
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+
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+ /* EVIL HACK TIME!
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+ This is supposed to prevent endless segfault loops in case of stack
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+ overflows that can occur as a result of the dummy sigaltstack()
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+ syscall. */
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+ struct sigaction oldact;
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+ struct sigaction act;
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+ memset(&act,0,sizeof(struct sigaction));
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+ act.sa_handler=hack_handler;
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+ sigaction(SIGSEGV,&act,&oldact);
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+ hack_stack = *((void**)((sp-framesize)&~7));
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+ sigaction(SIGSEGV,&oldact,&act);
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+
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/*
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* ATPCS B01 mandates 8-byte alignment
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*/
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