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| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-20 13:03:20 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-21 18:14:17 +0300 |
| commit | 739790605705ddcf18f21782b9c99ad7d53a8c11 (patch) | |
| tree | 8d357b05077c04b9100fd0835cd6dac2bd1040f0 | |
| parent | 9be182da0a7526f1b9a3777a336f83baa2e64d23 (diff) | |
| download | linux-739790605705ddcf18f21782b9c99ad7d53a8c11.tar.xz | |
prlimit: do_prlimit needs to have a speculation check
do_prlimit() adds the user-controlled resource value to a pointer that
will subsequently be dereferenced. In order to help prevent this
codepath from being used as a spectre "gadget" a barrier needs to be
added after checking the range.
Reported-by: Jordy Zomer <jordyzomer@google.com>
Tested-by: Jordy Zomer <jordyzomer@google.com>
Suggested-by: Linus Torvalds <torvalds@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | kernel/sys.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/sys.c b/kernel/sys.c index 5fd54bf0e886..88b31f096fb2 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -1442,6 +1442,8 @@ static int do_prlimit(struct task_struct *tsk, unsigned int resource, if (resource >= RLIM_NLIMITS) return -EINVAL; + resource = array_index_nospec(resource, RLIM_NLIMITS); + if (new_rlim) { if (new_rlim->rlim_cur > new_rlim->rlim_max) return -EINVAL; |