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UPSTREAM: arm64, vdso: Define vdso_{start,end} as array

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Adjust vdso_{start|end} to be char arrays to avoid compile-time analysis
that flags "too large" memcmp() calls with CONFIG_FORTIFY_SOURCE.

Cc: Jisheng Zhang <jszhang@marvell.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Suggested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
(cherry picked from commit dbbb08f500)

Change-Id: Ibec1756944779b7da3965855697ee2d797f6c611
Signed-off-by: Randy Li <randy.li@rock-chips.com>
This commit is contained in:
Kees Cook
2017-06-05 21:52:30 -07:00
committed by Tao Huang
parent 27a1523ff1
commit b0d48dba0c
1 changed files with 5 additions and 5 deletions
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10
arch/arm64/kernel/vdso.c
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@@ -36,7 +36,7 @@
#include <asm/vdso.h>
#include <asm/vdso_datapage.h>
extern char vdso_start, vdso_end;
extern char vdso_start[], vdso_end[];
static unsigned long vdso_pages;
static struct page **vdso_pagelist;
@@ -116,14 +116,14 @@ static int __init vdso_init(void)
int i;
unsigned long pfn;
if (memcmp(&vdso_start, "\177ELF", 4)) {
if (memcmp(vdso_start, "\177ELF", 4)) {
pr_err("vDSO is not a valid ELF object!\n");
return -EINVAL;
}
vdso_pages = (&vdso_end - &vdso_start) >> PAGE_SHIFT;
vdso_pages = (vdso_end - vdso_start) >> PAGE_SHIFT;
pr_info("vdso: %ld pages (%ld code @ %p, %ld data @ %p)\n",
vdso_pages + 1, vdso_pages, &vdso_start, 1L, vdso_data);
vdso_pages + 1, vdso_pages, vdso_start, 1L, vdso_data);
/* Allocate the vDSO pagelist, plus a page for the data. */
vdso_pagelist = kcalloc(vdso_pages + 1, sizeof(struct page *),
@@ -136,7 +136,7 @@ static int __init vdso_init(void)
/* Grab the vDSO code pages. */
pfn = sym_to_pfn(&vdso_start);
pfn = sym_to_pfn(vdso_start);
for (i = 0; i < vdso_pages; i++)
vdso_pagelist[i + 1] = pfn_to_page(pfn + i);