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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-10-12 17:36:47 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-10-12 17:36:47 +0200 |
| commit | 467251c69b1b39df78638d0d0cc60cf4d1d639a8 (patch) | |
| tree | e4d9d8ef28a71678d900d4c98f83ab01c7599ae4 | |
| parent | Merge tag 'rpmsg-v4.14-fixes' of git://github.com/andersson/remoteproc (diff) | |
| parent | waitid(): Add missing access_ok() checks (diff) | |
| download | linux-467251c69b1b39df78638d0d0cc60cf4d1d639a8.tar.xz linux-467251c69b1b39df78638d0d0cc60cf4d1d639a8.zip | |
Merge branch 'waitid-fix'
Merge waitid() fix from Kees Cook.
I'd have hoped that the unsafe_{get|put}_user() naming would have
avoided these kinds of stupid bugs, but no such luck.
* waitid-fix:
waitid(): Add missing access_ok() checks
| -rw-r--r-- | kernel/exit.c | 6 |
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); |