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[WRAPPER] Fixed some potential sagfault on my_backtrace wrapped function

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This commit is contained in:
ptitSeb 2025-04-26 15:43:01 +02:00
parent ff4ae1f4d8
commit c849178bf8
1 changed files with 6 additions and 0 deletions
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6
src/wrapped/wrappedlibc.c
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@ -3499,6 +3499,10 @@ EXPORT int my_backtrace(x64emu_t* emu, void** buffer, int size)
dwarf_unwind_t *unwind = init_dwarf_unwind_registers(emu);
int idx = 0;
char success = 0;
if(!(getProtection_fast(R_RSP)&PROT_READ))
return 0;
if(!(getProtection_fast((uintptr_t)buffer)&PROT_READ))
return 0;
uintptr_t addr = *(uintptr_t*)R_RSP;
buffer[0] = (void*)addr;
while (++idx < size) {
@ -3509,6 +3513,8 @@ EXPORT int my_backtrace(x64emu_t* emu, void** buffer, int size)
success = 2;
// See elfdwarf_private.c for the register mapping
unwind->regs[7] = unwind->regs[6]; // mov rsp, rbp
if(!(getProtection_fast(unwind->regs[7])&PROT_READ))
return idx-1;
unwind->regs[6] = *(uint64_t*)unwind->regs[7]; // pop rbp
unwind->regs[7] += 8;
ret_addr = *(uint64_t*)unwind->regs[7]; // ret