3.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Catalin Marinas <catalin.mari...@arm.com>
commit 9d42d48a342aee208c1154696196497fdc556bbf upstream.
The native (64-bit) sigval_t union contains sival_int (32-bit) and
sival_ptr (64-bit). When a compat application invokes a syscall that
takes a sigval_t value (as part of a larger structure, e.g.
compat_sys_mq_notify, compat_sys_timer_create), the compat_sigval_t
union is converted to the native sigval_t with sival_int overlapping
with either the least or the most significant half of sival_ptr,
depending on endianness. When the corresponding signal is delivered to a
compat application, on big endian the current (compat_uptr_t)sival_ptr
cast always returns 0 since sival_int corresponds to the top part of
sival_ptr. This patch fixes copy_siginfo_to_user32() so that sival_int
is copied to the compat_siginfo_t structure.
Reported-by: Bamvor Jian Zhang <bamvor.zhangj...@huawei.com>
Tested-by: Bamvor Jian Zhang <bamvor.zhangj...@huawei.com>
Signed-off-by: Catalin Marinas <catalin.mari...@arm.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
arch/arm64/kernel/signal32.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
--- a/arch/arm64/kernel/signal32.c
+++ b/arch/arm64/kernel/signal32.c
@@ -151,8 +151,7 @@ int copy_siginfo_to_user32(compat_siginf
case __SI_TIMER:
err |= __put_user(from->si_tid, &to->si_tid);
err |= __put_user(from->si_overrun, &to->si_overrun);
- err |= __put_user((compat_uptr_t)(unsigned long)from->si_ptr,
- &to->si_ptr);
+ err |= __put_user(from->si_int, &to->si_int);
break;
case __SI_POLL:
err |= __put_user(from->si_band, &to->si_band);
@@ -181,7 +180,7 @@ int copy_siginfo_to_user32(compat_siginf
case __SI_MESGQ: /* But this is */
err |= __put_user(from->si_pid, &to->si_pid);
err |= __put_user(from->si_uid, &to->si_uid);
- err |= __put_user((compat_uptr_t)(unsigned long)from->si_ptr,
&to->si_ptr);
+ err |= __put_user(from->si_int, &to->si_int);
break;
default: /* this is just in case for now ... */
err |= __put_user(from->si_pid, &to->si_pid);
--
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