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| author | Al Viro <viro@zeniv.linux.org.uk> | 2017-05-15 01:27:32 +0200 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2017-05-21 19:16:18 +0200 |
| commit | 4c48abe91be03d191d0c20cc755877da2cb35622 (patch) | |
| tree | 22c13f3cb38d7c6978bd37741c552c79e13b48d2 | |
| parent | wait_task_zombie: consolidate info logics (diff) | |
| download | linux-4c48abe91be03d191d0c20cc755877da2cb35622.tar.xz linux-4c48abe91be03d191d0c20cc755877da2cb35622.zip | |
waitid(): switch copyout of siginfo to unsafe_put_user()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| -rw-r--r-- | kernel/exit.c | 40 |
1 files changed, 25 insertions, 15 deletions
diff --git a/kernel/exit.c b/kernel/exit.c index 97db9ee03f90..f3b8c3a87bc1 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -1625,15 +1625,18 @@ SYSCALL_DEFINE5(waitid, int, which, pid_t, upid, struct siginfo __user *, if (!infop) return err; - if (put_user(err ? 0 : SIGCHLD, &infop->si_signo) || - put_user(0, &infop->si_errno) || - put_user((short)info.cause, &infop->si_code) || - put_user(info.pid, &infop->si_pid) || - put_user(info.uid, &infop->si_uid) || - put_user(info.status, &infop->si_status)) - err = -EFAULT; - + user_access_begin(); + unsafe_put_user(err ? 0 : SIGCHLD, &infop->si_signo, Efault); + unsafe_put_user(0, &infop->si_errno, Efault); + unsafe_put_user((short)info.cause, &infop->si_code, Efault); + unsafe_put_user(info.pid, &infop->si_pid, Efault); + unsafe_put_user(info.uid, &infop->si_uid, Efault); + unsafe_put_user(info.status, &infop->si_status, Efault); + user_access_end(); return err; +Efault: + user_access_end(); + return -EFAULT; } static long kernel_wait4(pid_t upid, int __user *stat_addr, @@ -1736,13 +1739,20 @@ COMPAT_SYSCALL_DEFINE5(waitid, return -EFAULT; } - if (put_user(err ? 0 : SIGCHLD, &infop->si_signo) || - put_user(0, &infop->si_errno) || - put_user((short)info.cause, &infop->si_code) || - put_user(info.pid, &infop->si_pid) || - put_user(info.uid, &infop->si_uid) || - put_user(info.status, &infop->si_status)) - err = -EFAULT; + if (!infop) + return err; + + user_access_begin(); + unsafe_put_user(err ? 0 : SIGCHLD, &infop->si_signo, Efault); + unsafe_put_user(0, &infop->si_errno, Efault); + unsafe_put_user((short)info.cause, &infop->si_code, Efault); + unsafe_put_user(info.pid, &infop->si_pid, Efault); + unsafe_put_user(info.uid, &infop->si_uid, Efault); + unsafe_put_user(info.status, &infop->si_status, Efault); + user_access_end(); return err; +Efault: + user_access_end(); + return -EFAULT; } #endif |