40 lines
1.6 KiB
Diff
40 lines
1.6 KiB
Diff
2007-09-01 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
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* lib/stack_smash_handler2: modified __stack_chk_fail() to trigger
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a segfault by accessing address 0x0. Every system with an MMU
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known by me, segfaults by dereferencing a NULL pointer
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* Makefile: added hack to compile stack_smash_handler2 with
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'--fno-omit-frame-pointer'.
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diff -up dietlibc-0.31/lib/stack_smash_handler2.c.~1~ dietlibc-0.31/lib/stack_smash_handler2.c
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--- dietlibc-0.31/lib/stack_smash_handler2.c.stacksmash
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+++ dietlibc-0.31/lib/stack_smash_handler2.c
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@@ -8,5 +8,13 @@ void __stack_chk_fail(void);
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* diagnostics. No more. :-( */
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void __stack_chk_fail(void) {
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__write2("smashed stack detected, program terminated.\n");
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- _exit(127);
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+
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+ /* trigger a segfault which can be inspected within a debugger (inclusive
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+ * stack-trace). 'abort(3)' at this place would be too heavy weighted.
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+ *
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+ * TODO: limit this to systems which are known to have an MMU (resp. is
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+ * dietlibc with stack-protector used on systems without an MMU?)
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+ */
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+ while (1)
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+ *(char *)0 = 0;
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}
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--- dietlibc-0.31/Makefile.stacksmash
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+++ dietlibc-0.31/Makefile
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@@ -172,9 +172,10 @@ $(OBJDIR)/%.o: %.S $(ARCH)/syscalls.h
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$(OBJDIR)/pthread_%.o: libpthread/pthread_%.c
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$(CROSS)$(CC) $(INC) $(CFLAGS) -c $< -o $@
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$(COMMENT) -$(CROSS)strip -x -R .comment -R .note $@
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+$(OBJDIR)/stack_smash_handler2.o: XCFLAGS:=-fno-omit-frame-pointer
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$(OBJDIR)/%.o: %.c
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- $(CROSS)$(CC) $(INC) $(CFLAGS) -c $< -o $@ -D__dietlibc__
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+ $(CROSS)$(CC) $(INC) $(CFLAGS) $(XCFLAGS) -c $< -o $@ -D__dietlibc__
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$(COMMENT) -$(CROSS)strip -x -R .comment -R .note $@
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endif
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