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Fix gdbserver qGetTLSAddr for x86_64 -m32 

gdbserver makes libthread_db to access uninitialized memory.  Surprisingly it
does not harm normally, even -fsanitize=address works with current gdbserver.
I have found just valgrind detects it as a very first warning for gdbserver:

Syscall param ptrace(addr) contains uninitialised byte(s)
   at 0x3721EECEBE: ptrace (ptrace.c:45)
   by 0x436EE5: ps_get_thread_area (linux-x86-low.c:252)
   by 0x5559D02: __td_ta_lookup_th_unique (td_ta_map_lwp2thr.c:157)
   by 0x5559EC3: td_ta_map_lwp2thr (td_ta_map_lwp2thr.c:207)
   by 0x43F87D: find_one_thread (thread-db.c:281)
   by 0x440038: thread_db_get_tls_address (thread-db.c:505)
   by 0x40F6D0: handle_query (server.c:2004)
   by 0x4124CF: process_serial_event (server.c:3445)
   by 0x4136B6: handle_serial_event (server.c:3889)
   by 0x419571: handle_file_event (event-loop.c:434)
   by 0x418D38: process_event (event-loop.c:189)
   by 0x419AB7: start_event_loop (event-loop.c:552)

Reproducible with:
cd gdb/testsuite
g++ -o gdb.threads/tls gdb.threads/tls{,2}.c -m32 -pthread
../gdbserver/gdbserver :1234 gdb.threads/tls
../gdb -batch gdb.threads/tls -ex 'target remote :1234' -ex 'b spin' -ex c -ex 'p a_thread_local'

It is more easily reproducible even without valgrind using s/0x00/0xff/ in the
attached patch.  It will then turn the output of reproducer above:
$1 = 0
->
Cannot find thread-local storage for Thread 29044, executable file .../gdb/testsuite/gdb.threads/tls:
Remote target failed to process qGetTLSAddr request

gdb/gdbserver/
2014-05-19  Jan Kratochvil  <jan.kratochvil@redhat.com>

	Fix gdbserver qGetTLSAddr for x86_64 -m32.
	* linux-x86-low.c (X86_64_USER_REGS): New.
	(x86_fill_gregset): Call memset for BUF first in x86_64 -m32 case.

Message-ID: <20140410114901.GA16411@host2.jankratochvil.net>
This commit is contained in:
Jan Kratochvil 2014-05-19 20:20:27 +02:00
parent cd8ae15e25
commit 9e0aa64f55
2 changed files with 11 additions and 0 deletions
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6
gdb/gdbserver/ChangeLog
View File

@ -1,3 +1,9 @@
2014-05-19 Jan Kratochvil <jan.kratochvil@redhat.com>
Fix gdbserver qGetTLSAddr for x86_64 -m32.
* linux-x86-low.c (X86_64_USER_REGS): New.
(x86_fill_gregset): Call memset for BUF first in x86_64 -m32 case.
2014-04-28 Yao Qi <yao@codesourcery.com>
* Makefile.in (i386-avx512.c): Fix the typo of generated file

5
gdb/gdbserver/linux-x86-low.c
View File

@ -206,6 +206,7 @@ static const int x86_64_regmap[] =
};
#define X86_64_NUM_REGS (sizeof (x86_64_regmap) / sizeof (x86_64_regmap[0]))
#define X86_64_USER_REGS (GS + 1)
#else /* ! __x86_64__ */
@ -364,6 +365,10 @@ x86_fill_gregset (struct regcache *regcache, void *buf)
collect_register (regcache, i, ((char *) buf) + x86_64_regmap[i]);
return;
}
/* 32-bit inferior registers need to be zero-extended.
Callers would read uninitialized memory otherwise. */
memset (buf, 0x00, X86_64_USER_REGS * 8);
#endif
for (i = 0; i < I386_NUM_REGS; i++)