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authorChristoph Hellwig <hch@lst.de>2020-05-05 13:12:53 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2020-05-05 23:46:09 +0300
commitc3b3f52476412a3899f2c65b220075aceb18dd2c (patch)
tree00314d287eac059d9a74b4dd57b761d9943a1742 /include/linux/compat.h
parent5456ffdee666c66e27ccc1006f9afe83ad55559f (diff)
downloadlinux-c3b3f52476412a3899f2c65b220075aceb18dd2c.tar.xz
signal: refactor copy_siginfo_to_user32
Factor out a copy_siginfo_to_external32 helper from copy_siginfo_to_user32 that fills out the compat_siginfo, but does so on a kernel space data structure. With that we can let architectures override copy_siginfo_to_user32 with their own implementations using copy_siginfo_to_external32. That allows moving the x32 SIGCHLD purely to x86 architecture code. As a nice side effect copy_siginfo_to_external32 also comes in handy for avoiding a set_fs() call in the coredump code later on. Contains improvements from Eric W. Biederman <ebiederm@xmission.com> and Arnd Bergmann <arnd@arndb.de>. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include/linux/compat.h')
-rw-r--r--include/linux/compat.h11
1 files changed, 9 insertions, 2 deletions
diff --git a/include/linux/compat.h b/include/linux/compat.h
index 0480ba4db592..e90100c0de72 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -402,8 +402,15 @@ 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(kernel_siginfo_t *to, const struct compat_siginfo __user *from);
-int copy_siginfo_to_user32(struct compat_siginfo __user *to, const kernel_siginfo_t *from);
+void copy_siginfo_to_external32(struct compat_siginfo *to,
+ const struct kernel_siginfo *from);
+int copy_siginfo_from_user32(kernel_siginfo_t *to,
+ const struct compat_siginfo __user *from);
+int __copy_siginfo_to_user32(struct compat_siginfo __user *to,
+ const kernel_siginfo_t *from);
+#ifndef copy_siginfo_to_user32
+#define copy_siginfo_to_user32 __copy_siginfo_to_user32
+#endif
int get_compat_sigevent(struct sigevent *event,
const struct compat_sigevent __user *u_event);