linux.git/drivers/crypto/nx, branch v6.13

crypto: nx - Fix invalid wait context during kexec reboot

2024-10-28T10:32:40+00:00

nx842_remove() call of_reconfig_notifier_unregister while holding the
devdata_spinlock. This could lead to an invalid wait context error during
kexec reboot, as of_reconfig_notifier_unregister tries to acquire a read-write
semaphore (check logs) while holding a spinlock.

Move the of_reconfig_notifier_unregister() call before acquiring the
spinlock to prevent this race condition invalid wait contexts during system
shutdown or kexec operations.

Log:

[ BUG: Invalid wait context ]
6.11.0-test2-10547-g684a64bf32b6-dirty #79 Not tainted
-----------------------------
kexec/61926 is trying to lock:
c000000002d8b590 ((of_reconfig_chain).rwsem){++++}-{4:4}, at: blocking_notifier_chain_unregister+0x44/0xa0
other info that might help us debug this:
context-{5:5}
4 locks held by kexec/61926:
 #0: c000000002926c70 (system_transition_mutex){+.+.}-{4:4}, at: __do_sys_reboot+0xf8/0x2e0
 #1: c00000000291af30 (&dev->mutex){....}-{4:4}, at: device_shutdown+0x160/0x310
 #2: c000000051011938 (&dev->mutex){....}-{4:4}, at: device_shutdown+0x174/0x310
 #3: c000000002d88070 (devdata_mutex){....}-{3:3}, at: nx842_remove+0xac/0x1bc
stack backtrace:
CPU: 2 UID: 0 PID: 61926 Comm: kexec Not tainted 6.11.0-test2-10547-g684a64bf32b6-dirty #79
Hardware name: IBM,9080-HEX POWER10 (architected) 0x800200 0xf000006 of:IBM,FW1060.00 (NH1060_012) hv:phyp pSeries
Call Trace:
[c0000000bb577400] [c000000001239704] dump_stack_lvl+0xc8/0x130 (unreliable)
[c0000000bb577440] [c000000000248398] __lock_acquire+0xb68/0xf00
[c0000000bb577550] [c000000000248820] lock_acquire.part.0+0xf0/0x2a0
[c0000000bb577670] [c00000000127faa0] down_write+0x70/0x1e0
[c0000000bb5776b0] [c0000000001acea4] blocking_notifier_chain_unregister+0x44/0xa0
[c0000000bb5776e0] [c000000000e2312c] of_reconfig_notifier_unregister+0x2c/0x40
[c0000000bb577700] [c000000000ded24c] nx842_remove+0x148/0x1bc
[c0000000bb577790] [c00000000011a114] vio_bus_remove+0x54/0xc0
[c0000000bb5777c0] [c000000000c1a44c] device_shutdown+0x20c/0x310
[c0000000bb577850] [c0000000001b0ab4] kernel_restart_prepare+0x54/0x70
[c0000000bb577870] [c000000000308718] kernel_kexec+0xa8/0x110
[c0000000bb5778e0] [c0000000001b1144] __do_sys_reboot+0x214/0x2e0
[c0000000bb577a40] [c000000000032f98] system_call_exception+0x148/0x310
[c0000000bb577e50] [c00000000000cedc] system_call_vectored_common+0x15c/0x2ec
--- interrupt: 3000 at 0x7fffa07e7df8
NIP:  00007fffa07e7df8 LR: 00007fffa07e7df8 CTR: 0000000000000000
REGS: c0000000bb577e80 TRAP: 3000   Not tainted  (6.11.0-test2-10547-g684a64bf32b6-dirty)
MSR:  800000000280f033   CR: 48022484  XER: 00000000
IRQMASK: 0
GPR00: 0000000000000058 00007ffff961f1e0 00007fffa08f7100 fffffffffee1dead
GPR04: 0000000028121969 0000000045584543 0000000000000000 0000000000000003
GPR08: 0000000000000003 0000000000000000 0000000000000000 0000000000000000
GPR12: 0000000000000000 00007fffa0a9b360 ffffffffffffffff 0000000000000000
GPR16: 0000000000000001 0000000000000002 0000000000000001 0000000000000001
GPR20: 000000011710f520 0000000000000000 0000000000000000 0000000000000001
GPR24: 0000000129be0480 0000000000000003 0000000000000003 00007ffff961f2b0
GPR28: 00000001170f2d30 00000001170f2d28 00007fffa08f18d0 0000000129be04a0
NIP [00007fffa07e7df8] 0x7fffa07e7df8
LR [00007fffa07e7df8] 0x7fffa07e7df8
--- interrupt: 3000

Suggested-by: Michael Ellerman 
Signed-off-by: Vishal Chourasia 
Signed-off-by: Herbert Xu

crypto: nx - Rename devdata_mutex to devdata_spinlock

2024-10-28T10:32:36+00:00

Rename devdata_mutex to devdata_spinlock to accurately reflect its
implementation as a spinlock.

[1] v1 https://lore.kernel.org/all/ZwyqD-w5hEhrnqTB@linux.ibm.com

Signed-off-by: Vishal Chourasia 
Signed-off-by: Herbert Xu

crypto: nx - Use static_assert() to check struct sizes

2024-08-17T05:55:50+00:00

Commit 1e6b251ce175 ("crypto: nx - Avoid -Wflex-array-member-not-at-end
warning") introduced tagged `struct nx842_crypto_header_hdr`. We want
to ensure that when new members need to be added to the flexible
structure, they are always included within this tagged struct.

So, we use `static_assert()` to ensure that the memory layout for
both the flexible structure and the tagged struct is the same after
any changes.

Signed-off-by: Gustavo A. R. Silva 
Signed-off-by: Herbert Xu

crypto: nx - Avoid -Wflex-array-member-not-at-end warning

2024-04-02T02:49:38+00:00

-Wflex-array-member-not-at-end is coming in GCC-14, and we are getting
ready to enable it globally. So, we are deprecating flexible-array
members in the middle of another structure.

There is currently an object (`header`) in `struct nx842_crypto_ctx`
that contains a flexible structure (`struct nx842_crypto_header`):

struct nx842_crypto_ctx {
	...
        struct nx842_crypto_header header;
        struct nx842_crypto_header_group group[NX842_CRYPTO_GROUP_MAX];
	...
};

So, in order to avoid ending up with a flexible-array member in the
middle of another struct, we use the `struct_group_tagged()` helper to
separate the flexible array from the rest of the members in the flexible
structure:

struct nx842_crypto_header {
	struct_group_tagged(nx842_crypto_header_hdr, hdr,

		... the rest of the members

	);
        struct nx842_crypto_header_group group[];
} __packed;

With the change described above, we can now declare an object of the
type of the tagged struct, without embedding the flexible array in the
middle of another struct:

struct nx842_crypto_ctx {
	...
        struct nx842_crypto_header_hdr header;
        struct nx842_crypto_header_group group[NX842_CRYPTO_GROUP_MAX];
	...
 } __packed;

We also use `container_of()` whenever we need to retrieve a pointer to
the flexible structure, through which we can access the flexible
array if needed.

So, with these changes, fix the following warning:

In file included from drivers/crypto/nx/nx-842.c:55:
drivers/crypto/nx/nx-842.h:174:36: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
  174 |         struct nx842_crypto_header header;
      |                                    ^~~~~~

Signed-off-by: Gustavo A. R. Silva 
Signed-off-by: Herbert Xu

crypto: nx - fix build warnings when DEBUG_FS is not enabled

2023-05-24T10:12:33+00:00

Fix build warnings when DEBUG_FS is not enabled by using an empty
do-while loop instead of a value:

In file included from ../drivers/crypto/nx/nx.c:27:
../drivers/crypto/nx/nx.c: In function 'nx_register_algs':
../drivers/crypto/nx/nx.h:173:33: warning: statement with no effect [-Wunused-value]
  173 | #define NX_DEBUGFS_INIT(drv)    (0)
../drivers/crypto/nx/nx.c:573:9: note: in expansion of macro 'NX_DEBUGFS_INIT'
  573 |         NX_DEBUGFS_INIT(&nx_driver);
../drivers/crypto/nx/nx.c: In function 'nx_remove':
../drivers/crypto/nx/nx.h:174:33: warning: statement with no effect [-Wunused-value]
  174 | #define NX_DEBUGFS_FINI(drv)    (0)
../drivers/crypto/nx/nx.c:793:17: note: in expansion of macro 'NX_DEBUGFS_FINI'
  793 |                 NX_DEBUGFS_FINI(&nx_driver);

Also, there is no need to build nx_debugfs.o when DEBUG_FS is not
enabled, so change the Makefile to accommodate that.

Fixes: ae0222b7289d ("powerpc/crypto: nx driver code supporting nx encryption")
Fixes: aef7b31c8833 ("powerpc/crypto: Build files for the nx device driver")
Signed-off-by: Randy Dunlap 
Cc: Breno Leitão 
Cc: Nayna Jain 
Cc: Paulo Flabiano Smorigo 
Cc: Herbert Xu 
Cc: "David S. Miller" 
Cc: linux-crypto@vger.kernel.org
Cc: Michael Ellerman 
Cc: Nicholas Piggin 
Cc: Christophe Leroy 
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Herbert Xu

crypto: nx - Fix sparse warnings

2023-02-14T05:39:33+00:00

This driver generates a large number of sparse warnings due to
two issues.

First of all the structure nx842_devdata is defined inline causing
the __rcu tag to be added to all users of it.  This easily fixed by
splitting up the struct definition.

The second issue is with kdoc markers being incomplete.  The trivial
case of nx842_exec_vas has been fixed, while the other incomplete
documentation has simply been downgraded to normal C comments.

Signed-off-by: Herbert Xu

crypto: Prepare to move crypto_tfm_ctx

2022-12-02T10:12:40+00:00

The helper crypto_tfm_ctx is only used by the Crypto API algorithm
code and should really be in algapi.h.  However, for historical
reasons many files relied on it to be in crypto.h.  This patch
changes those files to use algapi.h instead in prepartion for a
move.

Signed-off-by: Herbert Xu

crypto: nx - Remove the unneeded result variable

2022-09-09T08:18:33+00:00

Return the value set_msg_len() directly instead of storing it in another
redundant variable.

Reported-by: Zeal Robot 
Signed-off-by: ye xingchen 
Reviewed-by: Breno Leitao 
Signed-off-by: Herbert Xu

crypto: nx - Hold the reference returned by of_find_compatible_node

2022-07-08T07:21:16+00:00

In nx842_pseries_init(), we should hold the reference returned by
of_find_compatible_node() and use it to call of_node_put to keep
refcount balance.

Signed-off-by: Liang He 
Signed-off-by: Herbert Xu

crypto: nx - drop unexpected word "the"

2022-06-30T07:56:56+00:00

there is an unexpected word "the" in the comments that need to be dropped

>- * The DDE is setup with the the DDE count, byte count, and address of
>+ * The DDE is setup with the DDE count, byte count, and address of

Signed-off-by: Jiang Jian 
Signed-off-by: Herbert Xu