HEADS-UP: Library version number bumps
kris at obsecurity.org
Wed Sep 29 10:27:00 PDT 2004
On Wed, Sep 29, 2004 at 01:16:19PM -0400, Thomas Dickey wrote:
> On Wed, Sep 29, 2004 at 09:44:22AM -0700, Kris Kennaway wrote:
> > libncurses.so.5 in 5.x does not export many of the global variables
> > exported by 4.x version of libncurses.so.5. The missing symbols are:
> > 23: 0003e270 4 OBJECT GLOBAL DEFAULT 12 SP
> > 166: 0000ee58 26 FUNC GLOBAL DEFAULT 9 _nc_tracebits
> > 170: 00037c0e 2 OBJECT GLOBAL DEFAULT 12 ospeed
> > 175: 00037c2c 4 OBJECT GLOBAL DEFAULT 12 TABSIZE
> > 188: 00036870 4 OBJECT GLOBAL DEFAULT 12 BC
> > 247: 00037744 4 OBJECT GLOBAL DEFAULT 12 COLOR_PAIRS
> > 333: 00037c0c 1 OBJECT GLOBAL DEFAULT 12 PC
> > 370: 00037c1c 4 OBJECT GLOBAL DEFAULT 12 cur_term
> > 406: 00037540 512 OBJECT GLOBAL DEFAULT 12 acs_map
> > 434: 00037748 4 OBJECT GLOBAL DEFAULT 12 COLORS
> > 450: 0003e260 4 OBJECT GLOBAL DEFAULT 12 stdscr
> > 495: 00037c28 4 OBJECT GLOBAL DEFAULT 12 COLS
> > 498: 0003e268 4 OBJECT GLOBAL DEFAULT 12 newscr
> > 515: 0003e264 4 OBJECT GLOBAL DEFAULT 12 curscr
> > 528: 0003686c 4 OBJECT GLOBAL DEFAULT 12 UP
> > 545: 00037c24 4 OBJECT GLOBAL DEFAULT 12 LINES
> Something is going wrong with your script, since most of those are
> well-defined symbols that are present in the normal and wide-character
> libraries. (None are functions, all are variables).
> ** If the script is blameless, then there's a change in the way the
> ** linker builds shared libraries (the point I was trying to establish).
OK, I think my script is confused because objdump thinks the symbols
moved from .data to .bss. I'll take a closer look (and switch it over
to use readelf instead).
> The only other one that is noticeable is the private _nc_tracebits
> symbol (not the topic of this discussion, since applications that use
> private symbols aren't supported by anyone that I recall).
> > A 4.x binary that calls _nc_tracebits() will fail outright when run on
> > 5.x, but this is a debugging function and not likely to be widely used
> > in the real world, so that isn't a big deal.
> _nc_tracebits is a variable, not a function. You can't "call" it.
The linker, curs_trace(3) and <curses.h> beg to differ:
extern char *_nc_tracebits(void);
> Also - checking the changelog - _nc_tracebits was not in ncurses 4.2
> (it was introduced in late 1998).
We're not talking about ncurses 4.2, as I tried to clarify in my
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