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| author | Eric W. Biederman <ebiederm@xmission.com> | 2017-07-20 05:30:42 +0300 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2018-01-12 23:21:06 +0300 |
| commit | 8c36fdf5ed48cc17a257e71e168883307ce89b0e (patch) | |
| tree | b4b75b61fc82ae53e94e948902bc45a85ca21dca /include/linux/signal.h | |
| parent | 7771c66457004977b616bab785209f49d164f527 (diff) | |
| download | linux-8c36fdf5ed48cc17a257e71e168883307ce89b0e.tar.xz | |
signal: Reduce copy_siginfo to just a memcpy
The savings for copying just part of struct siginfo appears to be in the
noise on modern machines. So remove this ``optimization'' and simplify the code.
At the same time mark the second parameter as constant so there is no confusion
as to which direction the copy will go.
This ensures that a fully initialized siginfo that is sent ends up as
a fully initialized siginfo on the signal queue. This full initialization
ensures even confused code won't copy unitialized data to userspace, and
it prepares for turning copy_siginfo_to_user into a simple copy_to_user.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'include/linux/signal.h')
| -rw-r--r-- | include/linux/signal.h | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/include/linux/signal.h b/include/linux/signal.h index 042968dd98f0..8037b503ce91 100644 --- a/include/linux/signal.h +++ b/include/linux/signal.h @@ -11,13 +11,9 @@ struct task_struct; /* for sysctl */ extern int print_fatal_signals; -static inline void copy_siginfo(struct siginfo *to, struct siginfo *from) +static inline void copy_siginfo(struct siginfo *to, const struct siginfo *from) { - if (from->si_code < 0) - memcpy(to, from, sizeof(*to)); - else - /* _sigchld is currently the largest know union member */ - memcpy(to, from, __ARCH_SI_PREAMBLE_SIZE + sizeof(from->_sifields._sigchld)); + memcpy(to, from, sizeof(*to)); } int copy_siginfo_to_user(struct siginfo __user *to, const struct siginfo *from); |