JehanneOS/newlib
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Handle ss_flags value longjmp safe.

Browse Source 
* exceptions.cc (_cygtls::call_signal_handler): Drop manipulating
	thread's ss_flags here.  It's not safe against longjmp.
	* signal.cc (sigaltstack): Check if we're running on the alternate
	stack and set ss_flags returned in oss to SS_ONSTACK.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen
2015-06-27 12:08:07 +02:00
parent ba170254e6
commit c2c1b84309
3 changed files with 18 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
winsup/cygwin/signal.cc
View File

@@ -667,7 +667,17 @@ sigaltstack (const stack_t *ss, stack_t *oss)
}
}
if (oss)
memcpy (oss, &me.altstack, sizeof *oss);
{
char stack_marker;
memcpy (oss, &me.altstack, sizeof *oss);
if (!me.altstack.ss_flags && me.altstack.ss_sp)
{
if (&stack_marker >= (char *) me.altstack.ss_sp
&& &stack_marker < (char *) me.altstack.ss_sp
+ me.altstack.ss_size)
oss->ss_flags = SS_ONSTACK;
}
}
}
__except (EFAULT)
{