.symtab section is now broken ?

From: Aurelien NEPHTALI (aurelien.nephtali_at_wanadoo.fr)
Date: 10/03/04

  • Next message: Ruslan Ermilov: "Re: [Fwd: Re: Inability to create jails under 5.3-BETA6]" 
    Date: Sun, 3 Oct 2004 18:40:06 +0200
To: current@freebsd.org

    Hi,

    I have coded some tools that read ELF binaries. Thet used to work 1 or 2 years
    ago but now they don't. These tools parse an ELF file to get addresses of
    malloc(),free(),etc into the PLT to put breakpoint on them.

    The problem comes from the .symtab section. I'm using this struct to read
    symbols:

    typedef struct s_symhdr
    {
      unsigned int st_name;
      unsigned int st_value;
      unsigned int st_size;
      unsigned char st_info;
      unsigned char st_other;
      unsigned short st_shndx;
    } t_symhdr;

    Before, the field 'st_value' contained the symbol's address into the PLT,
    now it's null, ie (readelf output):

     71: 00000000 41 FUNC GLOBAL DEFAULT UND malloc
         ^^^^^^^^
          value

    I was suspecting the new gcc so I installed gcc 2.95 but it's the same problem.

    Is there a reason ? What to do to still get the value I want ?

    I have tested on NetBSD 1.6.1 and it works fine.

    Thanks. 

    -- 
NEPHTALI 'dak' Aurelien
TEK2 - Promo 2008
06.19.84.90.10
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  • Next message: Ruslan Ermilov: "Re: [Fwd: Re: Inability to create jails under 5.3-BETA6]"