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ARM: 9429/1: ioremap: Sync PGDs for VMALLOC shadow

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commit d6e6a74d4c upstream.

When sync:ing the VMALLOC area to other CPUs, make sure to also
sync the KASAN shadow memory for the VMALLOC area, so that we
don't get stale entries for the shadow memory in the top level PGD.

Since we are now copying PGDs in two instances, create a helper
function named memcpy_pgd() to do the actual copying, and
create a helper to map the addresses of VMALLOC_START and
VMALLOC_END into the corresponding shadow memory.

Co-developed-by: Melon Liu <melon1335@163.com>

Cc: stable@vger.kernel.org
Fixes: 565cbaad83 ("ARM: 9202/1: kasan: support CONFIG_KASAN_VMALLOC")
Link: https://lore.kernel.org/linux-arm-kernel/a1a1d062-f3a2-4d05-9836-3b098de9db6d@foss.st.com/
Reported-by: Clement LE GOFFIC <clement.legoffic@foss.st.com>
Suggested-by: Mark Rutland <mark.rutland@arm.com>
Suggested-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Linus Walleij
2024-10-23 13:03:14 +01:00
committed by Greg Kroah-Hartman
parent 7e3a8ea3d1
commit 1359fd9eae
1 changed files with 29 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files
arch/arm/mm/ioremap.c
+29 -4
View File
@@ -23,6 +23,7 @@
*/
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kasan.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/io.h>
@@ -115,16 +116,40 @@ int ioremap_page(unsigned long virt, unsigned long phys,
}
EXPORT_SYMBOL(ioremap_page);
#ifdef CONFIG_KASAN
static unsigned long arm_kasan_mem_to_shadow(unsigned long addr)
{
return (unsigned long)kasan_mem_to_shadow((void *)addr);
}
#else
static unsigned long arm_kasan_mem_to_shadow(unsigned long addr)
{
return 0;
}
#endif
static void memcpy_pgd(struct mm_struct *mm, unsigned long start,
unsigned long end)
{
end = ALIGN(end, PGDIR_SIZE);
memcpy(pgd_offset(mm, start), pgd_offset_k(start),
sizeof(pgd_t) * (pgd_index(end) - pgd_index(start)));
}
void __check_vmalloc_seq(struct mm_struct *mm)
{
int seq;
do {
seq = atomic_read(&init_mm.context.vmalloc_seq);
memcpy(pgd_offset(mm, VMALLOC_START),
pgd_offset_k(VMALLOC_START),
sizeof(pgd_t) * (pgd_index(VMALLOC_END) -
pgd_index(VMALLOC_START)));
memcpy_pgd(mm, VMALLOC_START, VMALLOC_END);
if (IS_ENABLED(CONFIG_KASAN_VMALLOC)) {
unsigned long start =
arm_kasan_mem_to_shadow(VMALLOC_START);
unsigned long end =
arm_kasan_mem_to_shadow(VMALLOC_END);
memcpy_pgd(mm, start, end);
}
/*
* Use a store-release so that other CPUs that observe the
* counter's new value are guaranteed to see the results of the