linux-kernel - [PATCH] execmem: enforce allocation size aligment to PAGE

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Message-ID: <20250423144808.1619863-1-rppt@kernel.org>
Date: Wed, 23 Apr 2025 17:48:07 +0300
From: Mike Rapoport <rppt@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Mike Rapoport <rppt@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] execmem: enforce allocation size aligment to PAGE_SIZE

From: "Mike Rapoport (Microsoft)" <rppt@...nel.org>

Before introduction of ROX cache execmem allocation size was always
implicitly aligned to PAGE_SIZE inside vmalloc.

However, when allocation happens from the ROX cache, this is not
enforced.

Make sure that the allocation size is always consistently aligned to
PAGE_SIZE.

Fixes: 2e45474ab14f ("execmem: add support for cache of large ROX pages")
Suggested-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Mike Rapoport (Microsoft) <rppt@...nel.org>
---
 mm/execmem.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/execmem.c b/mm/execmem.c
index e6c4f5076ca8..2b683e7d864d 100644
--- a/mm/execmem.c
+++ b/mm/execmem.c
@@ -377,6 +377,8 @@ void *execmem_alloc(enum execmem_type type, size_t size)
 	pgprot_t pgprot = range->pgprot;
 	void *p;
 
+	size = PAGE_ALIGN(size);
+
 	if (use_cache)
 		p = execmem_cache_alloc(range, size);
 	else
-- 
2.47.2