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authorKees Cook <keescook@chromium.org>2017-10-09 11:36:52 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-10-09 17:03:31 -0700
commit96ca579a1ecc943b75beba58bebb0356f6cc4b51 (patch)
tree604f625619b03abbd872e5acc69a85e1b30b80bc /kernel/exit.c
parentff33952e4d235efa98ce8a43416c19ddc16fb4fa (diff)
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waitid(): Add missing access_ok() checks
Adds missing access_ok() checks. CVE-2017-5123 Reported-by: Chris Salls <chrissalls5@gmail.com> Signed-off-by: Kees Cook <keescook@chromium.org> Acked-by: Al Viro <viro@zeniv.linux.org.uk> Fixes: 4c48abe91be0 ("waitid(): switch copyout of siginfo to unsafe_put_user()") Cc: stable@kernel.org # 4.13 Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/exit.c')
-rw-r--r--kernel/exit.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/exit.c b/kernel/exit.c
index f2cd53e92147..cf28528842bc 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1610,6 +1610,9 @@ SYSCALL_DEFINE5(waitid, int, which, pid_t, upid, struct siginfo __user *,
if (!infop)
return err;
+ if (!access_ok(VERIFY_WRITE, infop, sizeof(*infop)))
+ goto Efault;
+
user_access_begin();
unsafe_put_user(signo, &infop->si_signo, Efault);
unsafe_put_user(0, &infop->si_errno, Efault);
@@ -1735,6 +1738,9 @@ COMPAT_SYSCALL_DEFINE5(waitid,
if (!infop)
return err;
+ if (!access_ok(VERIFY_WRITE, infop, sizeof(*infop)))
+ goto Efault;
+
user_access_begin();
unsafe_put_user(signo, &infop->si_signo, Efault);
unsafe_put_user(0, &infop->si_errno, Efault);