linux-kernel - [PATCH 3/3] mm: remove vmalloc

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 18 Jun 2020 08:43:07 +0200
From:   Christoph Hellwig <hch@....de>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Dexuan Cui <decui@...rosoft.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Jessica Yu <jeyu@...nel.org>,
        x86@...nel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-hyperv@...r.kernel.org,
        linux-mm@...ck.org
Subject: [PATCH 3/3] mm: remove vmalloc_exec

Merge vmalloc_exec into its only caller.  Note that for !CONFIG_MMU
__vmalloc_node_range maps to __vmalloc, which directly clears the
__GFP_HIGHMEM added by the vmalloc_exec stub anyway.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 include/linux/vmalloc.h |  1 -
 kernel/module.c         |  4 +++-
 mm/nommu.c              | 17 -----------------
 mm/vmalloc.c            | 20 --------------------
 4 files changed, 3 insertions(+), 39 deletions(-)

diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index 48bb681e6c2aed..0221f852a7e1a3 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h
@@ -106,7 +106,6 @@ extern void *vzalloc(unsigned long size);
 extern void *vmalloc_user(unsigned long size);
 extern void *vmalloc_node(unsigned long size, int node);
 extern void *vzalloc_node(unsigned long size, int node);
-extern void *vmalloc_exec(unsigned long size);
 extern void *vmalloc_32(unsigned long size);
 extern void *vmalloc_32_user(unsigned long size);
 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask);
diff --git a/kernel/module.c b/kernel/module.c
index e8a198588f26ee..0c6573b98c3662 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -2783,7 +2783,9 @@ static void dynamic_debug_remove(struct module *mod, struct _ddebug *debug)
 
 void * __weak module_alloc(unsigned long size)
 {
-	return vmalloc_exec(size);
+	return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END,
+			GFP_KERNEL, PAGE_KERNEL_EXEC, VM_FLUSH_RESET_PERMS,
+			NUMA_NO_NODE, __func__);
 }
 
 bool __weak module_init_section(const char *name)
diff --git a/mm/nommu.c b/mm/nommu.c
index cdcad5d61dd194..f32a69095d509e 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -290,23 +290,6 @@ void *vzalloc_node(unsigned long size, int node)
 }
 EXPORT_SYMBOL(vzalloc_node);
 
-/**
- *	vmalloc_exec  -  allocate virtually contiguous, executable memory
- *	@size:		allocation size
- *
- *	Kernel-internal function to allocate enough pages to cover @size
- *	the page level allocator and map them into contiguous and
- *	executable kernel virtual space.
- *
- *	For tight control over page level allocator and protection flags
- *	use __vmalloc() instead.
- */
-
-void *vmalloc_exec(unsigned long size)
-{
-	return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM);
-}
-
 /**
  * vmalloc_32  -  allocate virtually contiguous memory (32bit addressable)
  *	@size:		allocation size
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 3091c2ca60dfd1..f60948aac0d0e4 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2696,26 +2696,6 @@ void *vzalloc_node(unsigned long size, int node)
 }
 EXPORT_SYMBOL(vzalloc_node);
 
-/**
- * vmalloc_exec - allocate virtually contiguous, executable memory
- * @size:	  allocation size
- *
- * Kernel-internal function to allocate enough pages to cover @size
- * the page level allocator and map them into contiguous and
- * executable kernel virtual space.
- *
- * For tight control over page level allocator and protection flags
- * use __vmalloc() instead.
- *
- * Return: pointer to the allocated memory or %NULL on error
- */
-void *vmalloc_exec(unsigned long size)
-{
-	return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END,
-			GFP_KERNEL, PAGE_KERNEL_EXEC, VM_FLUSH_RESET_PERMS,
-			NUMA_NO_NODE, __builtin_return_address(0));
-}
-
 #if defined(CONFIG_64BIT) && defined(CONFIG_ZONE_DMA32)
 #define GFP_VMALLOC32 (GFP_DMA32 | GFP_KERNEL)
 #elif defined(CONFIG_64BIT) && defined(CONFIG_ZONE_DMA)
-- 
2.26.2