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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug malloc/29283] assert when ptrace(PTRACE_POKEDATA) on allocated
 buffer
Date: Fri, 24 Jun 2022 07:22:59 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29283

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |fweimer at redhat dot com
              Flags|                            |security-
         Resolution|---                         |INVALID
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #2 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to russkubik from comment #0)
> $ BUFSIZ=3D72 ./tracer 0x5555555592a0 ./tracee

This is a 64-bit address, suggesting a 64-bit process.

But your code does this:

#define WORD uint32_t

                src =3D (WORD *)buf;
                dst =3D (WORD *)tracee_addr;

                for (size_t i =3D 0; i < buf_size / sizeof(WORD); i++) {
                    if (ptrace(PTRACE_POKEDATA, child, dst, *src) =3D=3D -1=
) {
                        handle_error("ptrace(PTRACE_POKEDATA)");
                    }
                    src++;
                    dst++;
                }

WORD needs to be 64 bits.

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