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coroutine-sigaltstack: Change jmp_buf to sigjmp_buf

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This is a simple patch to change the type of old_env from jmp_buf
to sigjmp_buf.  old_env is used by sigsetjmp and as such should be
a sigjmp_buf.

This fixes a stack_chk fail in a OSX 32bit build. Since at least on
OSX sigjmp_buf is four bytes larger then a jmpbuf, resulting in an
overflow in sigsetjmp. Due to variable reordering this overwrites
the stack cookie.

Signed-off-by: Willem Pinckaers <willem_qemu@lekkertech.net>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Peter: I think I must have missed this one when I converted
       all the jmp_buf to sigjmp_buf in commit 6ab7e546.
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This commit is contained in:
Willem Pinckaers 2014-11-07 19:51:59 -08:00 committed by Michael Tokarev
parent c21fd2c79e
commit 7f151e6f71
1 changed files with 1 additions and 1 deletions
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2
coroutine-sigaltstack.c
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@ -155,7 +155,7 @@ Coroutine *qemu_coroutine_new(void)
stack_t oss;
sigset_t sigs;
sigset_t osigs;
jmp_buf old_env;
sigjmp_buf old_env;
/* The way to manipulate stack is with the sigaltstack function. We
* prepare a stack, with it delivering a signal to ourselves and then