From: Alexander Potapenko <glider@google.com>
To: glider@google.com
Cc: Alexander Viro <viro@zeniv.linux.org.uk>,
Andrew Morton <akpm@linux-foundation.org>,
Andrey Konovalov <andreyknvl@google.com>,
Andy Lutomirski <luto@kernel.org>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Arnd Bergmann <arnd@arndb.de>, Borislav Petkov <bp@alien8.de>,
Christoph Hellwig <hch@lst.de>, Christoph Lameter <cl@linux.com>,
David Rientjes <rientjes@google.com>,
Dmitry Vyukov <dvyukov@google.com>,
Eric Dumazet <edumazet@google.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Herbert Xu <herbert@gondor.apana.org.au>,
Ilya Leoshkevich <iii@linux.ibm.com>,
Ingo Molnar <mingo@redhat.com>, Jens Axboe <axboe@kernel.dk>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Kees Cook <keescook@chromium.org>, Marco Elver <elver@google.com>,
Matthew Wilcox <willy@infradead.org>,
"Michael S. Tsirkin" <mst@redhat.com>,
Pekka Enberg <penberg@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Petr Mladek <pmladek@suse.com>,
Steven Rostedt <rostedt@goodmis.org>,
Thomas Gleixner <tglx@linutronix.de>,
Vasily Gorbik <gor@linux.ibm.com>,
Vegard Nossum <vegard.nossum@oracle.com>,
Vlastimil Babka <vbabka@suse.cz>,
linux-mm@kvack.org, linux-arch@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH 27/43] x86: kmsan: add iomem support
Date: Tue, 14 Dec 2021 17:20:34 +0100 [thread overview]
Message-ID: <20211214162050.660953-28-glider@google.com> (raw)
In-Reply-To: <20211214162050.660953-1-glider@google.com>
Functions from lib/iomap.c and arch/x86/lib/iomem.c interact with hardware,
so KMSAN must ensure that:
- every read function returns an initialized value
- every write function checks values before sending them to hardware.
Signed-off-by: Alexander Potapenko <glider@google.com>
---
Link: https://linux-review.googlesource.com/id/I45527599f09090aca046dfe1a26df453adab100d
---
arch/x86/lib/iomem.c | 5 +++++
lib/iomap.c | 40 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 45 insertions(+)
diff --git a/arch/x86/lib/iomem.c b/arch/x86/lib/iomem.c
index df50451d94ef7..2307770f3f4c8 100644
--- a/arch/x86/lib/iomem.c
+++ b/arch/x86/lib/iomem.c
@@ -1,6 +1,7 @@
#include <linux/string.h>
#include <linux/module.h>
#include <linux/io.h>
+#include <linux/kmsan-checks.h>
#define movs(type,to,from) \
asm volatile("movs" type:"=&D" (to), "=&S" (from):"0" (to), "1" (from):"memory")
@@ -37,6 +38,8 @@ void memcpy_fromio(void *to, const volatile void __iomem *from, size_t n)
n-=2;
}
rep_movs(to, (const void *)from, n);
+ /* KMSAN must treat values read from devices as initialized. */
+ kmsan_unpoison_memory(to, n);
}
EXPORT_SYMBOL(memcpy_fromio);
@@ -45,6 +48,8 @@ void memcpy_toio(volatile void __iomem *to, const void *from, size_t n)
if (unlikely(!n))
return;
+ /* Make sure uninitialized memory isn't copied to devices. */
+ kmsan_check_memory(from, n);
/* Align any unaligned destination IO */
if (unlikely(1 & (unsigned long)to)) {
movs("b", to, from);
diff --git a/lib/iomap.c b/lib/iomap.c
index fbaa3e8f19d6c..bdda1a42771b2 100644
--- a/lib/iomap.c
+++ b/lib/iomap.c
@@ -6,6 +6,7 @@
*/
#include <linux/pci.h>
#include <linux/io.h>
+#include <linux/kmsan-checks.h>
#include <linux/export.h>
@@ -70,26 +71,31 @@ static void bad_io_access(unsigned long port, const char *access)
#define mmio_read64be(addr) swab64(readq(addr))
#endif
+__no_sanitize_memory
unsigned int ioread8(const void __iomem *addr)
{
IO_COND(addr, return inb(port), return readb(addr));
return 0xff;
}
+__no_sanitize_memory
unsigned int ioread16(const void __iomem *addr)
{
IO_COND(addr, return inw(port), return readw(addr));
return 0xffff;
}
+__no_sanitize_memory
unsigned int ioread16be(const void __iomem *addr)
{
IO_COND(addr, return pio_read16be(port), return mmio_read16be(addr));
return 0xffff;
}
+__no_sanitize_memory
unsigned int ioread32(const void __iomem *addr)
{
IO_COND(addr, return inl(port), return readl(addr));
return 0xffffffff;
}
+__no_sanitize_memory
unsigned int ioread32be(const void __iomem *addr)
{
IO_COND(addr, return pio_read32be(port), return mmio_read32be(addr));
@@ -142,18 +148,21 @@ static u64 pio_read64be_hi_lo(unsigned long port)
return lo | (hi << 32);
}
+__no_sanitize_memory
u64 ioread64_lo_hi(const void __iomem *addr)
{
IO_COND(addr, return pio_read64_lo_hi(port), return readq(addr));
return 0xffffffffffffffffULL;
}
+__no_sanitize_memory
u64 ioread64_hi_lo(const void __iomem *addr)
{
IO_COND(addr, return pio_read64_hi_lo(port), return readq(addr));
return 0xffffffffffffffffULL;
}
+__no_sanitize_memory
u64 ioread64be_lo_hi(const void __iomem *addr)
{
IO_COND(addr, return pio_read64be_lo_hi(port),
@@ -161,6 +170,7 @@ u64 ioread64be_lo_hi(const void __iomem *addr)
return 0xffffffffffffffffULL;
}
+__no_sanitize_memory
u64 ioread64be_hi_lo(const void __iomem *addr)
{
IO_COND(addr, return pio_read64be_hi_lo(port),
@@ -188,22 +198,32 @@ EXPORT_SYMBOL(ioread64be_hi_lo);
void iowrite8(u8 val, void __iomem *addr)
{
+ /* Make sure uninitialized memory isn't copied to devices. */
+ kmsan_check_memory(&val, sizeof(val));
IO_COND(addr, outb(val,port), writeb(val, addr));
}
void iowrite16(u16 val, void __iomem *addr)
{
+ /* Make sure uninitialized memory isn't copied to devices. */
+ kmsan_check_memory(&val, sizeof(val));
IO_COND(addr, outw(val,port), writew(val, addr));
}
void iowrite16be(u16 val, void __iomem *addr)
{
+ /* Make sure uninitialized memory isn't copied to devices. */
+ kmsan_check_memory(&val, sizeof(val));
IO_COND(addr, pio_write16be(val,port), mmio_write16be(val, addr));
}
void iowrite32(u32 val, void __iomem *addr)
{
+ /* Make sure uninitialized memory isn't copied to devices. */
+ kmsan_check_memory(&val, sizeof(val));
IO_COND(addr, outl(val,port), writel(val, addr));
}
void iowrite32be(u32 val, void __iomem *addr)
{
+ /* Make sure uninitialized memory isn't copied to devices. */
+ kmsan_check_memory(&val, sizeof(val));
IO_COND(addr, pio_write32be(val,port), mmio_write32be(val, addr));
}
EXPORT_SYMBOL(iowrite8);
@@ -239,24 +259,32 @@ static void pio_write64be_hi_lo(u64 val, unsigned long port)
void iowrite64_lo_hi(u64 val, void __iomem *addr)
{
+ /* Make sure uninitialized memory isn't copied to devices. */
+ kmsan_check_memory(&val, sizeof(val));
IO_COND(addr, pio_write64_lo_hi(val, port),
writeq(val, addr));
}
void iowrite64_hi_lo(u64 val, void __iomem *addr)
{
+ /* Make sure uninitialized memory isn't copied to devices. */
+ kmsan_check_memory(&val, sizeof(val));
IO_COND(addr, pio_write64_hi_lo(val, port),
writeq(val, addr));
}
void iowrite64be_lo_hi(u64 val, void __iomem *addr)
{
+ /* Make sure uninitialized memory isn't copied to devices. */
+ kmsan_check_memory(&val, sizeof(val));
IO_COND(addr, pio_write64be_lo_hi(val, port),
mmio_write64be(val, addr));
}
void iowrite64be_hi_lo(u64 val, void __iomem *addr)
{
+ /* Make sure uninitialized memory isn't copied to devices. */
+ kmsan_check_memory(&val, sizeof(val));
IO_COND(addr, pio_write64be_hi_lo(val, port),
mmio_write64be(val, addr));
}
@@ -328,14 +356,20 @@ static inline void mmio_outsl(void __iomem *addr, const u32 *src, int count)
void ioread8_rep(const void __iomem *addr, void *dst, unsigned long count)
{
IO_COND(addr, insb(port,dst,count), mmio_insb(addr, dst, count));
+ /* KMSAN must treat values read from devices as initialized. */
+ kmsan_unpoison_memory(dst, count);
}
void ioread16_rep(const void __iomem *addr, void *dst, unsigned long count)
{
IO_COND(addr, insw(port,dst,count), mmio_insw(addr, dst, count));
+ /* KMSAN must treat values read from devices as initialized. */
+ kmsan_unpoison_memory(dst, count * 2);
}
void ioread32_rep(const void __iomem *addr, void *dst, unsigned long count)
{
IO_COND(addr, insl(port,dst,count), mmio_insl(addr, dst, count));
+ /* KMSAN must treat values read from devices as initialized. */
+ kmsan_unpoison_memory(dst, count * 4);
}
EXPORT_SYMBOL(ioread8_rep);
EXPORT_SYMBOL(ioread16_rep);
@@ -343,14 +377,20 @@ EXPORT_SYMBOL(ioread32_rep);
void iowrite8_rep(void __iomem *addr, const void *src, unsigned long count)
{
+ /* Make sure uninitialized memory isn't copied to devices. */
+ kmsan_check_memory(src, count);
IO_COND(addr, outsb(port, src, count), mmio_outsb(addr, src, count));
}
void iowrite16_rep(void __iomem *addr, const void *src, unsigned long count)
{
+ /* Make sure uninitialized memory isn't copied to devices. */
+ kmsan_check_memory(src, count * 2);
IO_COND(addr, outsw(port, src, count), mmio_outsw(addr, src, count));
}
void iowrite32_rep(void __iomem *addr, const void *src, unsigned long count)
{
+ /* Make sure uninitialized memory isn't copied to devices. */
+ kmsan_check_memory(src, count * 4);
IO_COND(addr, outsl(port, src,count), mmio_outsl(addr, src, count));
}
EXPORT_SYMBOL(iowrite8_rep);
--
2.34.1.173.g76aa8bc2d0-goog
next prev parent reply other threads:[~2021-12-14 16:23 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-14 16:20 [PATCH 00/43] Add KernelMemorySanitizer infrastructure Alexander Potapenko
2021-12-14 16:20 ` [PATCH 01/43] arch/x86: add missing include to sparsemem.h Alexander Potapenko
2021-12-14 16:20 ` [PATCH 02/43] stackdepot: reserve 5 extra bits in depot_stack_handle_t Alexander Potapenko
2021-12-14 16:20 ` [PATCH 03/43] kasan: common: adapt to the new prototype of __stack_depot_save() Alexander Potapenko
2021-12-14 16:20 ` [PATCH 04/43] instrumented.h: allow instrumenting both sides of copy_from_user() Alexander Potapenko
2021-12-14 16:20 ` [PATCH 05/43] asm: x86: instrument usercopy in get_user() and __put_user_size() Alexander Potapenko
2021-12-14 16:20 ` [PATCH 06/43] asm-generic: instrument usercopy in cacheflush.h Alexander Potapenko
2021-12-14 16:20 ` [PATCH 07/43] compiler_attributes.h: add __disable_sanitizer_instrumentation Alexander Potapenko
2021-12-15 13:24 ` Mark Rutland
2021-12-15 13:33 ` Marco Elver
2021-12-14 16:20 ` [PATCH 08/43] kmsan: add ReST documentation Alexander Potapenko
2021-12-14 16:20 ` [PATCH 09/43] kmsan: introduce __no_sanitize_memory and __no_kmsan_checks Alexander Potapenko
2021-12-15 13:27 ` Mark Rutland
2021-12-14 16:20 ` [PATCH 10/43] kmsan: pgtable: reduce vmalloc space Alexander Potapenko
2021-12-15 13:36 ` Mark Rutland
2022-03-18 14:14 ` Alexander Potapenko
2021-12-14 16:20 ` [PATCH 11/43] libnvdimm/pfn_dev: increase MAX_STRUCT_PAGE_SIZE Alexander Potapenko
2021-12-14 16:20 ` [PATCH 12/43] kcsan: clang: retire CONFIG_KCSAN_KCOV_BROKEN Alexander Potapenko
2021-12-15 13:33 ` Mark Rutland
2021-12-15 13:39 ` Marco Elver
2021-12-15 14:43 ` Mark Rutland
2022-03-18 14:34 ` Alexander Potapenko
2021-12-14 16:20 ` [PATCH 13/43] kmsan: add KMSAN runtime core Alexander Potapenko
2021-12-14 16:34 ` Greg Kroah-Hartman
2021-12-16 10:33 ` Alexander Potapenko
2021-12-17 16:22 ` Greg Kroah-Hartman
2022-03-21 14:12 ` Alexander Potapenko
[not found] ` <CACT4Y+Y_torRwzh0eDMn+pJh=YT26hGrAPA499WqN1dV+4bDHA@mail.gmail.com>
2022-03-21 13:17 ` Alexander Potapenko
2021-12-14 16:20 ` [PATCH 14/43] MAINTAINERS: add entry for KMSAN Alexander Potapenko
2021-12-14 16:20 ` [PATCH 15/43] kmsan: mm: maintain KMSAN metadata for page operations Alexander Potapenko
2021-12-14 16:20 ` [PATCH 16/43] kmsan: mm: call KMSAN hooks from SLUB code Alexander Potapenko
2022-01-07 17:22 ` Vlastimil Babka
2022-03-25 13:15 ` Alexander Potapenko
2021-12-14 16:20 ` [PATCH 17/43] kmsan: handle task creation and exiting Alexander Potapenko
2021-12-14 16:20 ` [PATCH 18/43] kmsan: unpoison @tlb in arch_tlb_gather_mmu() Alexander Potapenko
2021-12-14 16:20 ` [PATCH 19/43] kmsan: init: call KMSAN initialization routines Alexander Potapenko
2021-12-14 16:20 ` [PATCH 20/43] instrumented.h: add KMSAN support Alexander Potapenko
2021-12-14 16:20 ` [PATCH 21/43] kmsan: mark noinstr as __no_sanitize_memory Alexander Potapenko
2021-12-15 13:49 ` Mark Rutland
2021-12-14 16:20 ` [PATCH 22/43] kmsan: initialize the output of READ_ONCE_NOCHECK() Alexander Potapenko
2021-12-14 16:20 ` [PATCH 23/43] kmsan: make READ_ONCE_TASK_STACK() return initialized values Alexander Potapenko
2021-12-14 16:20 ` [PATCH 24/43] kmsan: disable KMSAN instrumentation for certain kernel parts Alexander Potapenko
2021-12-15 13:53 ` Mark Rutland
2021-12-14 16:20 ` [PATCH 25/43] kmsan: skip shadow checks in files doing context switches Alexander Potapenko
2021-12-15 14:13 ` Mark Rutland
2021-12-15 16:28 ` Alexander Potapenko
2021-12-15 17:22 ` Mark Rutland
2021-12-14 16:20 ` [PATCH 26/43] kmsan: virtio: check/unpoison scatterlist in vring_map_one_sg() Alexander Potapenko
2022-01-06 12:46 ` Michael S. Tsirkin
2021-12-14 16:20 ` Alexander Potapenko [this message]
2021-12-14 16:20 ` [PATCH 28/43] kmsan: dma: unpoison DMA mappings Alexander Potapenko
2021-12-14 16:20 ` [PATCH 29/43] kmsan: handle memory sent to/from USB Alexander Potapenko
2021-12-14 16:20 ` [PATCH 30/43] kmsan: add tests for KMSAN Alexander Potapenko
2021-12-14 16:20 ` [PATCH 31/43] kmsan: disable strscpy() optimization under KMSAN Alexander Potapenko
2021-12-14 16:20 ` [PATCH 32/43] crypto: kmsan: disable accelerated configs " Alexander Potapenko
2021-12-14 16:20 ` [PATCH 33/43] kmsan: disable physical page merging in biovec Alexander Potapenko
2021-12-15 14:17 ` Mark Rutland
2021-12-15 16:30 ` Alexander Potapenko
2021-12-14 16:20 ` [PATCH 34/43] kmsan: block: skip bio block merging logic for KMSAN Alexander Potapenko
2021-12-14 16:20 ` [PATCH 35/43] x86: kmsan: use __msan_ string functions where possible Alexander Potapenko
2021-12-14 16:20 ` [PATCH 36/43] x86: kmsan: sync metadata pages on page fault Alexander Potapenko
2021-12-14 16:20 ` [PATCH 37/43] x86: kasan: kmsan: support CONFIG_GENERIC_CSUM on x86, enable it for KASAN/KMSAN Alexander Potapenko
2021-12-14 16:20 ` [PATCH 38/43] x86: fs: kmsan: disable CONFIG_DCACHE_WORD_ACCESS Alexander Potapenko
2021-12-14 16:20 ` [PATCH 39/43] x86: kmsan: handle register passing from uninstrumented code Alexander Potapenko
2021-12-17 21:51 ` Thomas Gleixner
2021-12-20 14:35 ` Alexander Potapenko
2021-12-14 16:20 ` [PATCH 40/43] kmsan: kcov: unpoison area->list in kcov_remote_area_put() Alexander Potapenko
2021-12-14 16:20 ` [PATCH 41/43] security: kmsan: fix interoperability with auto-initialization Alexander Potapenko
2021-12-14 16:38 ` Greg Kroah-Hartman
2021-12-14 17:00 ` Alexander Potapenko
2021-12-14 17:33 ` Greg Kroah-Hartman
2021-12-14 16:20 ` [PATCH 42/43] objtool: kmsan: list KMSAN API functions as uaccess-safe Alexander Potapenko
2021-12-14 16:20 ` [PATCH 43/43] x86: kmsan: enable KMSAN builds for x86 Alexander Potapenko
2021-12-14 16:36 ` [PATCH 00/43] Add KernelMemorySanitizer infrastructure Greg Kroah-Hartman
2021-12-16 10:12 ` Alexander Potapenko
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