Hi,
I’m trying to use lldb 6.0 on Linux to debug a process that has an SGX enclave
inside it. One of the data structures there (the “TCS”) only permits access to
certain fields. The problem is that when I try to access those fields in LLDB,
it tries to read an entire page of memory from the guest, even if I only wanted
to read one word. It then fails the operation when access to later parts of the
page fails.
e.g., this LLDB command:
(lldb) x/1g 0x200005000
error: memory read failed for 0x200005000
Triggered this series of failures in the lldb-server process:
read(7, "$x200005000,200#ed", 8192) = 18
gettid() = 18169
process_vm_readv(18174, [{iov_base=0x556a00151cf0, iov_len=512}], 1,
[{iov_base=0x200005000, iov_len=512}], 1, 0) = -1 EFAULT (Bad address)
ptrace(PTRACE_PEEKDATA, 18174, 0x200005000, [NULL]) = 0
ptrace(PTRACE_PEEKDATA, 18174, 0x200005008, [NULL]) = 0
ptrace(PTRACE_PEEKDATA, 18174, 0x200005010, [0xd000]) = 0
ptrace(PTRACE_PEEKDATA, 18174, 0x200005018, [0x300000001]) = 0
ptrace(PTRACE_PEEKDATA, 18174, 0x200005020, [0x1d950]) = 0
ptrace(PTRACE_PEEKDATA, 18174, 0x200005028, [0x3fffc00be750]) = 0
ptrace(PTRACE_PEEKDATA, 18174, 0x200005030, [0xa000]) = 0
ptrace(PTRACE_PEEKDATA, 18174, 0x200005038, [0xb000]) = 0
ptrace(PTRACE_PEEKDATA, 18174, 0x200005040, [0xffffffffffffffff]) = 0
ptrace(PTRACE_PEEKDATA, 18174, 0x200005048, 0x7ffc96125858) = -1 EIO
(Input/output error)
write(7, "$E08#ad", 7) = 7
How can I convince lldb to access just the words I asked it for?
Thanks,
Andrew
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