host_to_target_siginfo() is implemented by a combination of host_to_target_siginfo_noswap() followed by tswap_siginfo(). The first of these two functions assumes that the target_siginfo_t it is writing to is correctly aligned, but the pointer passed into host_to_target_siginfo() is directly from the guest and might be misaligned. Use a local variable to avoid this problem. (tswap_siginfo() does now correctly handle a misaligned destination.)
Signed-off-by: Peter Maydell <peter.mayd...@linaro.org> --- linux-user/signal.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/linux-user/signal.c b/linux-user/signal.c index 8ea0cbf..7e2a80f 100644 --- a/linux-user/signal.c +++ b/linux-user/signal.c @@ -400,8 +400,9 @@ static void tswap_siginfo(target_siginfo_t *tinfo, void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info) { - host_to_target_siginfo_noswap(tinfo, info); - tswap_siginfo(tinfo, tinfo); + target_siginfo_t tgt_tmp; + host_to_target_siginfo_noswap(&tgt_tmp, info); + tswap_siginfo(tinfo, &tgt_tmp); } /* XXX: we support only POSIX RT signals are used. */ -- 1.9.1