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signal: Introduce copy_siginfo_from_user and use it's return value

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In preparation for using a smaller version of siginfo in the kernel
introduce copy_siginfo_from_user and use it when siginfo is copied from
userspace.

Make the pattern for using copy_siginfo_from_user and
copy_siginfo_from_user32 to capture the return value and return that
value on error.

This is a necessary prerequisite for using a smaller siginfo
in the kernel than the kernel exports to userspace.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman
2018-04-18 17:30:19 -05:00
parent f283801851
commit 4cd2e0e70a
3 changed files with 22 additions and 16 deletions
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include/linux/signal.h
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@@ -22,6 +22,7 @@ static inline void clear_siginfo(struct siginfo *info)
}
int copy_siginfo_to_user(struct siginfo __user *to, const struct siginfo *from);
int copy_siginfo_from_user(struct siginfo *to, const struct siginfo __user *from);
enum siginfo_layout {
SIL_KILL,