linux-kernel - [PATCH] mm/mprotect: Fix do_mprotect

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Date:   Tue,  6 Jun 2023 14:29:12 -0400
From:   "Liam R. Howlett" <Liam.Howlett@...cle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Lorenzo Stoakes <lstoakes@...il.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>,
        Jeff Xu <jeffxu@...omium.org>, stable@...r.kernel.org
Subject: [PATCH] mm/mprotect: Fix do_mprotect_pkey() limit check

The return of do_mprotect_pkey() can still be incorrectly returned as
success if there is a gap that spans to or beyond the end address passed
in.  Update the check to ensure that the end address has indeed been
seen.

Link: https://lore.kernel.org/all/CABi2SkXjN+5iFoBhxk71t3cmunTk-s=rB4T7qo0UQRh17s49PQ@mail.gmail.com/
Fixes: 82f951340f25 ("mm/mprotect: fix do_mprotect_pkey() return on error")
Reported-by: Jeff Xu <jeffxu@...omium.org>
Cc: <stable@...r.kernel.org>
Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 mm/mprotect.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/mprotect.c b/mm/mprotect.c
index 92d3d3ca390a..c59e7561698c 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -867,7 +867,7 @@ static int do_mprotect_pkey(unsigned long start, size_t len,
 	}
 	tlb_finish_mmu(&tlb);
 
-	if (!error && vma_iter_end(&vmi) < end)
+	if (!error && tmp < end)
 		error = -ENOMEM;
 
 out:
-- 
2.39.2