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Random number generator fixes for Linux 6.11-rc6.

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Merge tag 'random-6.11-rc6-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/crng/random

Pull random number generator fix from Jason Donenfeld:
 "Reject invalid flags passed to vgetrandom() in the same way that
  getrandom() does, so that the behavior is the same, from Yann.

  The flags argument to getrandom() only has a behavioral effect on the
  function if the RNG isn't initialized yet, so vgetrandom() falls back
  to the syscall in that case. But if the RNG is initialized, all of the
  flags behave the same way, so vgetrandom() didn't bother checking
  them, and just ignored them entirely.

  But that doesn't account for invalid flags passed in, which need to be
  rejected so we can use them later"

* tag 'random-6.11-rc6-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/crng/random:
  random: vDSO: reject unknown getrandom() flags
This commit is contained in:
Linus Torvalds 2024-08-29 13:59:18 +12:00
commit d5d547aa7b
1 changed files with 4 additions and 0 deletions
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4
lib/vdso/getrandom.c
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@ -85,6 +85,10 @@ __cvdso_getrandom_data(const struct vdso_rng_data *rng_info, void *buffer, size_
if (unlikely(((unsigned long)opaque_state & ~PAGE_MASK) + sizeof(*state) > PAGE_SIZE))
return -EFAULT;
/* Handle unexpected flags by falling back to the kernel. */
if (unlikely(flags & ~(GRND_NONBLOCK | GRND_RANDOM | GRND_INSECURE)))
goto fallback_syscall;
/* If the caller passes the wrong size, which might happen due to CRIU, fallback. */
if (unlikely(opaque_len != sizeof(*state)))
goto fallback_syscall;