Re: [PATCH 09/13] gdb/elfread: remove use of sprintf

[Andrew Burgess <aburgess@redhat.com>]

Simon Marchi <simon.marchi@efficios.com> writes:

> When building on macOS, I get:
>
>     /Users/smarchi/src/binutils-gdb/gdb/elfread.c:813:3: error: 'sprintf' is deprecated: This function is provided for compatibility reasons only.  Due to security concerns inherent in the design of sprintf(3), it is highly recommended that you use snprintf(3) instead. [-Werror,-Wdeprecated-declarations]
>       813 |   sprintf (name_got_plt, "%s" SYMBOL_GOT_PLT_SUFFIX, name);
>           |   ^
>
> Change this use of sprintf with an std::string, which also allows
> getting rid of a use of alloca.

+1 for alloca removal!

Approved-By: Andrew Burgess <aburgess@redhat.com>

Thanks,
Andrew


>
> Change-Id: I296e25c863463ef05eca582c8303557570d63cf0
> ---
>  gdb/elfread.c | 14 ++++++--------
>  1 file changed, 6 insertions(+), 8 deletions(-)
>
> diff --git a/gdb/elfread.c b/gdb/elfread.c
> index e3890ae0270c..fcbd0176d08f 100644
> --- a/gdb/elfread.c
> +++ b/gdb/elfread.c
> @@ -804,20 +804,17 @@ static int
>  elf_gnu_ifunc_resolve_by_got (const char *name, CORE_ADDR *addr_p)
>  {
>    gnu_ifunc_debug_printf ("resolving \"%s\" by GOT", name);
> -  char *name_got_plt;
> -  const size_t got_suffix_len = strlen (SYMBOL_GOT_PLT_SUFFIX);
>    int found = 0;
>    const char *func = __func__;
>  
> -  name_got_plt = (char *) alloca (strlen (name) + got_suffix_len + 1);
> -  sprintf (name_got_plt, "%s" SYMBOL_GOT_PLT_SUFFIX, name);
> +  std::string name_got_plt = std::string (name) + SYMBOL_GOT_PLT_SUFFIX;
>  
>    /* FIXME: we only search the initial namespace.
>  
>       To search other namespaces, we would need to provide context, e.g. in
>       form of an objfile in that namespace.  */
>    current_program_space->iterate_over_objfiles_in_search_order
> -    ([name, name_got_plt, &addr_p, &found, func] (struct objfile *objfile)
> +    ([name, &name_got_plt, &addr_p, &found, func] (struct objfile *objfile)
>         {
>  	 bfd *obfd = objfile->obfd.get ();
>  	 struct gdbarch *gdbarch = objfile->arch ();
> @@ -828,8 +825,8 @@ elf_gnu_ifunc_resolve_by_got (const char *name, CORE_ADDR *addr_p)
>  	 gdb_byte *buf = (gdb_byte *) alloca (ptr_size);
>  
>  	 bound_minimal_symbol msym
> -	   = lookup_minimal_symbol (current_program_space, name_got_plt,
> -				    objfile);
> +	   = lookup_minimal_symbol (current_program_space,
> +				    name_got_plt.c_str (), objfile);
>  	 if (msym.minsym == NULL)
>  	   return 0;
>  	 if (msym.minsym->type () != mst_slot_got_plt)
> @@ -850,7 +847,8 @@ elf_gnu_ifunc_resolve_by_got (const char *name, CORE_ADDR *addr_p)
>  	 addr = gdbarch_addr_bits_remove (gdbarch, addr);
>  
>  	 gnu_ifunc_debug_printf_func (func, "GOT entry \"%s\" points to %s",
> -				      name_got_plt, paddress (gdbarch, addr));
> +				      name_got_plt.c_str (),
> +				      paddress (gdbarch, addr));
>  
>  	 if (elf_gnu_ifunc_record_cache (name, addr))
>  	   {
> -- 
> 2.55.0