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authorEric W. Biederman <ebiederm@xmission.com>2017-08-01 01:15:31 +0300
committerEric W. Biederman <ebiederm@xmission.com>2018-01-16 02:55:59 +0300
commit212a36a17efe4d696d1e3c31ebd79a9fb0cbb14b (patch)
tree943b3454aad156b37e2396ac314e6afc2d43c84c /include/linux/compat.h
parent56b81456f4ee048699f72edc02b369a33d1b94e6 (diff)
downloadlinux-212a36a17efe4d696d1e3c31ebd79a9fb0cbb14b.tar.xz
signal: Unify and correct copy_siginfo_from_user32
The function copy_siginfo_from_user32 is used for two things, in ptrace since the dawn of siginfo for arbirarily modifying a signal that user space sees, and in sigqueueinfo to send a signal with arbirary siginfo data. Create a single copy of copy_siginfo_from_user32 that all architectures share, and teach it to handle all of the cases in the siginfo union. In the generic version of copy_siginfo_from_user32 ensure that all of the fields in siginfo are initialized so that the siginfo structure can be safely copied to userspace if necessary. When copying the embedded sigval union copy the si_int member. That ensures the 32bit values passes through the kernel unchanged. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'include/linux/compat.h')
-rw-r--r--include/linux/compat.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/compat.h b/include/linux/compat.h
index e698ec1908d9..8a9643857c4a 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -510,7 +510,7 @@ long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
unsigned long bitmap_size);
long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
unsigned long bitmap_size);
-int copy_siginfo_from_user32(siginfo_t *to, struct compat_siginfo __user *from);
+int copy_siginfo_from_user32(siginfo_t *to, const struct compat_siginfo __user *from);
int copy_siginfo_to_user32(struct compat_siginfo __user *to, const siginfo_t *from);
int get_compat_sigevent(struct sigevent *event,
const struct compat_sigevent __user *u_event);