46 lines
1.6 KiB
Diff
46 lines
1.6 KiB
Diff
From c9e34f92dafffe1fd37ba7ef7fb198002576bea1 Mon Sep 17 00:00:00 2001
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From: Nagappan Ramasamy Palaniappan <nagappan.ramasamy.palaniappan@oracle.com>
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Date: Wed, 2 Aug 2023 12:54:02 +0000
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Subject: [PATCH 2/5] prlimit: do_prlimit needs to have a speculation check
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CVE: CVE-2023-0458
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commit 739790605705ddcf18f21782b9c99ad7d53a8c11
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Author: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Date: Fri Jan 20 11:03:20 2023 +0100
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prlimit: do_prlimit needs to have a speculation check
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do_prlimit() adds the user-controlled resource value to a pointer that
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will subsequently be dereferenced. In order to help prevent this
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codepath from being used as a spectre "gadget" a barrier needs to be
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added after checking the range.
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Reported-by: Jordy Zomer <jordyzomer@google.com>
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Tested-by: Jordy Zomer <jordyzomer@google.com>
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Suggested-by: Linus Torvalds <torvalds@linuxfoundation.org>
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Signed-off-by: Nagappan Ramasamy Palaniappan <nagappan.ramasamy.palaniappan@oracle.com>
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Reviewed-by: Laurence Rochfort <laurence.rochfort@oracle.com>
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---
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kernel/sys.c | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/kernel/sys.c b/kernel/sys.c
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index 75852f64d..45480f6f6 100644
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--- a/kernel/sys.c
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+++ b/kernel/sys.c
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@@ -1439,6 +1439,8 @@ static int do_prlimit(struct task_struct *tsk, unsigned int resource,
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if (resource >= RLIM_NLIMITS)
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return -EINVAL;
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+ resource = array_index_nospec(resource, RLIM_NLIMITS);
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+
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if (new_rlim) {
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if (new_rlim->rlim_cur > new_rlim->rlim_max)
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return -EINVAL;
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--
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2.31.1
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