The patch below does not apply to the 4.14-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From a4c8dd9c2d0987cf542a2a0c42684c9c6d78a04e Mon Sep 17 00:00:00 2001
From: Jeffle Xu <jefflexu(a)linux.alibaba.com>
Date: Tue, 2 Feb 2021 11:35:28 +0800
Subject: [PATCH] dm table: fix iterate_devices based device capability checks
According to the definition of dm_iterate_devices_fn:
* This function must iterate through each section of device used by the
* target until it encounters a non-zero return code, which it then returns.
* Returns zero if no callout returned non-zero.
For some target type (e.g. dm-stripe), one call of iterate_devices() may
iterate multiple underlying devices internally, in which case a non-zero
return code returned by iterate_devices_callout_fn will stop the iteration
in advance. No iterate_devices_callout_fn should return non-zero unless
device iteration should stop.
Rename dm_table_requires_stable_pages() to dm_table_any_dev_attr() and
elevate it for reuse to stop iterating (and return non-zero) on the
first device that causes iterate_devices_callout_fn to return non-zero.
Use dm_table_any_dev_attr() to properly iterate through devices.
Rename device_is_nonrot() to device_is_rotational() and invert logic
accordingly to fix improper disposition.
Fixes: c3c4555edd10 ("dm table: clear add_random unless all devices have it set")
Fixes: 4693c9668fdc ("dm table: propagate non rotational flag")
Cc: stable(a)vger.kernel.org
Signed-off-by: Jeffle Xu <jefflexu(a)linux.alibaba.com>
Signed-off-by: Mike Snitzer <snitzer(a)redhat.com>
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 4acf2342f7ad..3e211e64f348 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -1295,6 +1295,46 @@ struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector)
return &t->targets[(KEYS_PER_NODE * n) + k];
}
+/*
+ * type->iterate_devices() should be called when the sanity check needs to
+ * iterate and check all underlying data devices. iterate_devices() will
+ * iterate all underlying data devices until it encounters a non-zero return
+ * code, returned by whether the input iterate_devices_callout_fn, or
+ * iterate_devices() itself internally.
+ *
+ * For some target type (e.g. dm-stripe), one call of iterate_devices() may
+ * iterate multiple underlying devices internally, in which case a non-zero
+ * return code returned by iterate_devices_callout_fn will stop the iteration
+ * in advance.
+ *
+ * Cases requiring _any_ underlying device supporting some kind of attribute,
+ * should use the iteration structure like dm_table_any_dev_attr(), or call
+ * it directly. @func should handle semantics of positive examples, e.g.
+ * capable of something.
+ *
+ * Cases requiring _all_ underlying devices supporting some kind of attribute,
+ * should use the iteration structure like dm_table_supports_nowait() or
+ * dm_table_supports_discards(). Or introduce dm_table_all_devs_attr() that
+ * uses an @anti_func that handle semantics of counter examples, e.g. not
+ * capable of something. So: return !dm_table_any_dev_attr(t, anti_func);
+ */
+static bool dm_table_any_dev_attr(struct dm_table *t,
+ iterate_devices_callout_fn func)
+{
+ struct dm_target *ti;
+ unsigned int i;
+
+ for (i = 0; i < dm_table_get_num_targets(t); i++) {
+ ti = dm_table_get_target(t, i);
+
+ if (ti->type->iterate_devices &&
+ ti->type->iterate_devices(ti, func, NULL))
+ return true;
+ }
+
+ return false;
+}
+
static int count_device(struct dm_target *ti, struct dm_dev *dev,
sector_t start, sector_t len, void *data)
{
@@ -1595,12 +1635,12 @@ static int dm_table_supports_dax_write_cache(struct dm_table *t)
return false;
}
-static int device_is_nonrot(struct dm_target *ti, struct dm_dev *dev,
- sector_t start, sector_t len, void *data)
+static int device_is_rotational(struct dm_target *ti, struct dm_dev *dev,
+ sector_t start, sector_t len, void *data)
{
struct request_queue *q = bdev_get_queue(dev->bdev);
- return q && blk_queue_nonrot(q);
+ return q && !blk_queue_nonrot(q);
}
static int device_is_not_random(struct dm_target *ti, struct dm_dev *dev,
@@ -1611,23 +1651,6 @@ static int device_is_not_random(struct dm_target *ti, struct dm_dev *dev,
return q && !blk_queue_add_random(q);
}
-static bool dm_table_all_devices_attribute(struct dm_table *t,
- iterate_devices_callout_fn func)
-{
- struct dm_target *ti;
- unsigned i;
-
- for (i = 0; i < dm_table_get_num_targets(t); i++) {
- ti = dm_table_get_target(t, i);
-
- if (!ti->type->iterate_devices ||
- !ti->type->iterate_devices(ti, func, NULL))
- return false;
- }
-
- return true;
-}
-
static int device_not_write_same_capable(struct dm_target *ti, struct dm_dev *dev,
sector_t start, sector_t len, void *data)
{
@@ -1779,27 +1802,6 @@ static int device_requires_stable_pages(struct dm_target *ti,
return q && blk_queue_stable_writes(q);
}
-/*
- * If any underlying device requires stable pages, a table must require
- * them as well. Only targets that support iterate_devices are considered:
- * don't want error, zero, etc to require stable pages.
- */
-static bool dm_table_requires_stable_pages(struct dm_table *t)
-{
- struct dm_target *ti;
- unsigned i;
-
- for (i = 0; i < dm_table_get_num_targets(t); i++) {
- ti = dm_table_get_target(t, i);
-
- if (ti->type->iterate_devices &&
- ti->type->iterate_devices(ti, device_requires_stable_pages, NULL))
- return true;
- }
-
- return false;
-}
-
void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
struct queue_limits *limits)
{
@@ -1849,10 +1851,10 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
dax_write_cache(t->md->dax_dev, true);
/* Ensure that all underlying devices are non-rotational. */
- if (dm_table_all_devices_attribute(t, device_is_nonrot))
- blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
- else
+ if (dm_table_any_dev_attr(t, device_is_rotational))
blk_queue_flag_clear(QUEUE_FLAG_NONROT, q);
+ else
+ blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
if (!dm_table_supports_write_same(t))
q->limits.max_write_same_sectors = 0;
@@ -1864,8 +1866,11 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
/*
* Some devices don't use blk_integrity but still want stable pages
* because they do their own checksumming.
+ * If any underlying device requires stable pages, a table must require
+ * them as well. Only targets that support iterate_devices are considered:
+ * don't want error, zero, etc to require stable pages.
*/
- if (dm_table_requires_stable_pages(t))
+ if (dm_table_any_dev_attr(t, device_requires_stable_pages))
blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, q);
else
blk_queue_flag_clear(QUEUE_FLAG_STABLE_WRITES, q);
@@ -1876,7 +1881,7 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
* Clear QUEUE_FLAG_ADD_RANDOM if any underlying device does not
* have it set.
*/
- if (blk_queue_add_random(q) && dm_table_all_devices_attribute(t, device_is_not_random))
+ if (blk_queue_add_random(q) && dm_table_any_dev_attr(t, device_is_not_random))
blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);
/*
Please consider applying the following upstream patch to stable trees
v5.4 and up
commit 660d2062190db131d2feaf19914e90f868fe285c
Author: Ard Biesheuvel <ardb(a)kernel.org>
Date: Wed Jan 13 10:11:35 2021 +0100
crypto - shash: reduce minimum alignment of shash_desc structure
On architectures such as arm64, it reduces the worst case memory
footprint of a SHASH_DESC_ON_STACK() allocation (which reserves space
for two struct shash_desc instances) by ~350 bytes.
The patch below does not apply to the 5.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From df84fe94708985cdfb78a83148322bcd0a699472 Mon Sep 17 00:00:00 2001
From: Timothy E Baldwin <T.E.Baldwin99(a)members.leeds.ac.uk>
Date: Sat, 16 Jan 2021 15:18:54 +0000
Subject: [PATCH] arm64: ptrace: Fix seccomp of traced syscall -1 (NO_SYSCALL)
Since commit f086f67485c5 ("arm64: ptrace: add support for syscall
emulation"), if system call number -1 is called and the process is being
traced with PTRACE_SYSCALL, for example by strace, the seccomp check is
skipped and -ENOSYS is returned unconditionally (unless altered by the
tracer) rather than carrying out action specified in the seccomp filter.
The consequence of this is that it is not possible to reliably strace
a seccomp based implementation of a foreign system call interface in
which r7/x8 is permitted to be -1 on entry to a system call.
Also trace_sys_enter and audit_syscall_entry are skipped if a system
call is skipped.
Fix by removing the in_syscall(regs) check restoring the previous
behaviour which is like AArch32, x86 (which uses generic code) and
everything else.
Cc: Oleg Nesterov <oleg(a)redhat.com>
Cc: Catalin Marinas<catalin.marinas(a)arm.com>
Cc: <stable(a)vger.kernel.org>
Fixes: f086f67485c5 ("arm64: ptrace: add support for syscall emulation")
Reviewed-by: Kees Cook <keescook(a)chromium.org>
Reviewed-by: Sudeep Holla <sudeep.holla(a)arm.com>
Tested-by: Sudeep Holla <sudeep.holla(a)arm.com>
Signed-off-by: Timothy E Baldwin <T.E.Baldwin99(a)members.leeds.ac.uk>
Link: https://lore.kernel.org/r/90edd33b-6353-1228-791f-0336d94d5f8c@majoroak.me.…
Signed-off-by: Will Deacon <will(a)kernel.org>
diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
index 3d5c8afca75b..170f42fd6101 100644
--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c
@@ -1797,7 +1797,7 @@ int syscall_trace_enter(struct pt_regs *regs)
if (flags & (_TIF_SYSCALL_EMU | _TIF_SYSCALL_TRACE)) {
tracehook_report_syscall(regs, PTRACE_SYSCALL_ENTER);
- if (!in_syscall(regs) || (flags & _TIF_SYSCALL_EMU))
+ if (flags & _TIF_SYSCALL_EMU)
return NO_SYSCALL;
}