Crash when calling atoi in client loaded with the Linux private loader

[derekbruening]

From [email protected] on June 09, 2011 17:37:03

To reproduce:

Place the following client in api/samples/atoi.c:

#include "dr_api.h"
DR_EXPORT void dr_init(client_id_t id) {
int three = atoi("3");
dr_printf("%d\n", three);
}

Rebuild (need to run 'cmake .' to pick up the new .c file) and run it on ls, and I get a segfault with this stack trace:

#0 0x0000000048855cc1 in ____strtoll_l_internal ()
#1 0x0000000048853240 in atoi ()
#2 0x000000007200067b in dr_init (id=0) at /afs/csail.mit.edu/u/r/rnk/dynamorio/git-clone/api/samples/atoi.c:6
#3 0x0000000071272237 in instrument_init ()
at /afs/csail.mit.edu/u/r/rnk/dynamorio/git-clone/core/x86/instrument.c:527
#4 0x0000000071079f1b in dynamorio_app_init ()
at /afs/csail.mit.edu/u/r/rnk/dynamorio/git-clone/core/dynamo.c:620
#5 0x00007f741ec95a56 in _init () at /afs/csail.mit.edu/u/r/rnk/dynamorio/git-clone/core/linux/preload.c:186
#6 0x00007f741eea8718 in call_init () from /lib64/ld-linux-x86-64.so.2
#7 0x00007f741eea8847 in _dl_init_internal () from /lib64/ld-linux-x86-64.so.2
#8 0x00007f741ee9ba9a in _dl_start_user () from /lib64/ld-linux-x86-64.so.2
#9 0x0000000000000001 in ?? ()
#10 0x00007fffb63dab8c in ?? ()
#11 0x0000000000000000 in ?? ()

I don't have enough debug info for libc to tell what it's trying to do, but I'm guessing this is a complication of having two versions of libc in the address space. -no_private_loader fixes the problem. -mangle_app_tls didn't solve this problem, so I'm not sure what the issue is.

I'll leave this assigned to me; I may look at it later. It's possible this is the same issue as issue #480 .

Original issue: http://code.google.com/p/dynamorio/issues/detail?id=494

[derekbruening]

From [email protected] on June 14, 2011 08:21:47

xref issue #495 : may be the same thing

[derekbruening]

From [email protected] on August 06, 2011 17:13:21

Fixed in r900 .

Status: Fixed