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Fri, 21 Aug 2026 19:22:09 -0700 (PDT) Received: from [172.31.0.1] ([188.253.12.30]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2d6768d9004sm884865ad.70.2026.08.21.19.22.07 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 21 Aug 2026 19:22:09 -0700 (PDT) Content-Type: multipart/alternative; boundary="------------vJ5PGBIfP1TKxMBKTgdQrpcc" Message-ID: Date: Sat, 22 Aug 2026 10:22:04 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] gdb: Check DW_OP_deref_type size against type Content-Language: en-US To: Tom Tromey References: <20260814085303.2561156-1-firmiana402@gmail.com> <87pkzbnul3.fsf@tromey.com> Cc: gdb-patches@sourceware.org From: JIELUN WU In-Reply-To: <87pkzbnul3.fsf@tromey.com> X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gdb-patches-bounces~public-inbox=simark.ca@sourceware.org This is a multi-part message in MIME format. --------------vJ5PGBIfP1TKxMBKTgdQrpcc Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 2026/8/22 3:26, Tom Tromey wrote: >>>>>> Jielun Wu writes: >> DWARF v5 requires the explicit size operand of DW_OP_deref_type to >> match the size of the referenced base type. The evaluator currently >> passes both sizes to dwarf_expr_context::deref without validating the >> encoding, and the generic dereference helper accepts the mismatch by >> zero-extending the bytes read from memory. >> Reject a mismatch after resolving the base type. Add a DWARF assembler >> test covering both DW_OP_deref_type and DW_OP_GNU_deref_type. >> Tested on x86_64-linux. > I think we're going to need copyright assignments in order to merge this > and the other patches. > > You can email 'assign@gnu.org' to get started. > > Tom Hi Tom, Thanks for checking. I believe my copyright assignment has already been completed and should be on file. I started the process in late June and received the final confirmation email in early August. Please let me know if it is not showing up in the records, or if you need any additional information from me. Best, Jielun --------------vJ5PGBIfP1TKxMBKTgdQrpcc Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 7bit


On 2026/8/22 3:26, Tom Tromey wrote:
Jielun Wu <firmiana402@gmail.com> writes:


      

        
DWARF v5 requires the explicit size operand of DW_OP_deref_type to
match the size of the referenced base type.  The evaluator currently
passes both sizes to dwarf_expr_context::deref without validating the
encoding, and the generic dereference helper accepts the mismatch by
zero-extending the bytes read from memory.


      

      

      

        
Reject a mismatch after resolving the base type.  Add a DWARF assembler
test covering both DW_OP_deref_type and DW_OP_GNU_deref_type.


      

      

      

        
Tested on x86_64-linux.


      

      
I think we're going to need copyright assignments in order to merge this
and the other patches.

You can email 'assign@gnu.org' to get started.

Tom

    

    


    

    
Hi Tom,

      

      Thanks for checking. I believe my copyright assignment has already
      been

      completed and should be on file. I started the process in late
      June and

      received the final confirmation email in early August.

      

      Please let me know if it is not showing up in the records, or if
      you need

      any additional information from me.

      

      Best,

      Jielun

  
  


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