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From: glider@google.com
To: Herbert Xu <herbert@gondor.apana.org.au>,
	"David S. Miller" <davem@davemloft.net>,
	 Vegard Nossum <vegard.nossum@oracle.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	linux-mm@kvack.org
Cc: glider@google.com, viro@zeniv.linux.org.uk,
	adilger.kernel@dilger.ca,  akpm@linux-foundation.org,
	andreyknvl@google.com, aryabinin@virtuozzo.com,  luto@kernel.org,
	ard.biesheuvel@linaro.org, arnd@arndb.de, hch@infradead.org,
	 hch@lst.de, darrick.wong@oracle.com, dmitry.torokhov@gmail.com,
	 ebiggers@google.com, edumazet@google.com, ericvh@gmail.com,
	 gregkh@linuxfoundation.org, harry.wentland@amd.com,
	iii@linux.ibm.com,  mingo@elte.hu, jasowang@redhat.com,
	axboe@kernel.dk, m.szyprowski@samsung.com,  elver@google.com,
	mark.rutland@arm.com, martin.petersen@oracle.com,
	 schwidefsky@de.ibm.com, willy@infradead.org, mst@redhat.com,
	monstr@monstr.eu,  pmladek@suse.com, cai@lca.pw,
	rdunlap@infradead.org, robin.murphy@arm.com,
	 sergey.senozhatsky@gmail.com, rostedt@goodmis.org,
	tiwai@suse.com,  tytso@mit.edu, tglx@linutronix.de,
	gor@linux.ibm.com, wsa@the-dreams.de
Subject: [PATCH RFC v3 16/36] crypto: kmsan: disable accelerated configs under KMSAN
Date: Fri, 22 Nov 2019 12:26:01 +0100
Message-ID: <20191122112621.204798-17-glider@google.com> (raw)
In-Reply-To: <20191122112621.204798-1-glider@google.com>

KMSAN is unable to understand when initialized values come from assembly.
Disable accelerated configs in KMSAN builds to prevent false positive
reports.

Signed-off-by: Alexander Potapenko <glider@google.com>
To: Alexander Potapenko <glider@google.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Vegard Nossum <vegard.nossum@oracle.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: linux-mm@kvack.org
---

Change-Id: Iddc71a2a27360e036d719c0940ebf15553cf8de8
---
 crypto/Kconfig | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/crypto/Kconfig b/crypto/Kconfig
index 9e524044d312..502a75f1b597 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -309,11 +309,15 @@ config CRYPTO_AEGIS128
 config CRYPTO_AEGIS128_SIMD
 	bool "Support SIMD acceleration for AEGIS-128"
 	depends on CRYPTO_AEGIS128 && ((ARM || ARM64) && KERNEL_MODE_NEON)
+	# Disable under KMSAN to prevent false positives from assembly.
+	depends on !KMSAN
 	default y
 
 config CRYPTO_AEGIS128_AESNI_SSE2
 	tristate "AEGIS-128 AEAD algorithm (x86_64 AESNI+SSE2 implementation)"
 	depends on X86 && 64BIT
+	# Disable under KMSAN to prevent false positives from assembly.
+	depends on !KMSAN
 	select CRYPTO_AEAD
 	select CRYPTO_SIMD
 	help
@@ -571,6 +575,8 @@ config CRYPTO_CRC32C
 config CRYPTO_CRC32C_INTEL
 	tristate "CRC32c INTEL hardware acceleration"
 	depends on X86
+	# Disable under KMSAN to prevent false positives from assembly.
+	depends on !KMSAN
 	select CRYPTO_HASH
 	help
 	  In Intel processor with SSE4.2 supported, the processor will
@@ -611,6 +617,8 @@ config CRYPTO_CRC32
 config CRYPTO_CRC32_PCLMUL
 	tristate "CRC32 PCLMULQDQ hardware acceleration"
 	depends on X86
+	# Disable under KMSAN to prevent false positives from assembly.
+	depends on !KMSAN
 	select CRYPTO_HASH
 	select CRC32
 	help
@@ -649,6 +657,8 @@ config CRYPTO_CRCT10DIF
 config CRYPTO_CRCT10DIF_PCLMUL
 	tristate "CRCT10DIF PCLMULQDQ hardware acceleration"
 	depends on X86 && 64BIT && CRC_T10DIF
+	# Disable under KMSAN to prevent false positives from assembly.
+	depends on !KMSAN
 	select CRYPTO_HASH
 	help
 	  For x86_64 processors with SSE4.2 and PCLMULQDQ supported,
@@ -695,6 +705,8 @@ config CRYPTO_POLY1305
 config CRYPTO_POLY1305_X86_64
 	tristate "Poly1305 authenticator algorithm (x86_64/SSE2/AVX2)"
 	depends on X86 && 64BIT
+	# Disable under KMSAN to prevent false positives from assembly.
+	depends on !KMSAN
 	select CRYPTO_POLY1305
 	help
 	  Poly1305 authenticator algorithm, RFC7539.
@@ -814,6 +826,8 @@ config CRYPTO_SHA1
 config CRYPTO_SHA1_SSSE3
 	tristate "SHA1 digest algorithm (SSSE3/AVX/AVX2/SHA-NI)"
 	depends on X86 && 64BIT
+	# Disable under KMSAN to prevent false positives from assembly.
+	depends on !KMSAN
 	select CRYPTO_SHA1
 	select CRYPTO_HASH
 	help
@@ -825,6 +839,8 @@ config CRYPTO_SHA1_SSSE3
 config CRYPTO_SHA256_SSSE3
 	tristate "SHA256 digest algorithm (SSSE3/AVX/AVX2/SHA-NI)"
 	depends on X86 && 64BIT
+	# Disable under KMSAN to prevent false positives from assembly.
+	depends on !KMSAN
 	select CRYPTO_SHA256
 	select CRYPTO_HASH
 	help
@@ -837,6 +853,8 @@ config CRYPTO_SHA256_SSSE3
 config CRYPTO_SHA512_SSSE3
 	tristate "SHA512 digest algorithm (SSSE3/AVX/AVX2)"
 	depends on X86 && 64BIT
+	# Disable under KMSAN to prevent false positives from assembly.
+	depends on !KMSAN
 	select CRYPTO_SHA512
 	select CRYPTO_HASH
 	help
@@ -1011,6 +1029,8 @@ config CRYPTO_WP512
 config CRYPTO_GHASH_CLMUL_NI_INTEL
 	tristate "GHASH hash function (CLMUL-NI accelerated)"
 	depends on X86 && 64BIT
+	# Disable under KMSAN to prevent false positives from assembly.
+	depends on !KMSAN
 	select CRYPTO_CRYPTD
 	help
 	  This is the x86_64 CLMUL-NI accelerated implementation of
@@ -1064,6 +1084,8 @@ config CRYPTO_AES_TI
 config CRYPTO_AES_NI_INTEL
 	tristate "AES cipher algorithms (AES-NI)"
 	depends on X86
+	# Disable under KMSAN to prevent false positives from assembly.
+	depends on !KMSAN
 	select CRYPTO_AEAD
 	select CRYPTO_LIB_AES
 	select CRYPTO_ALGAPI
@@ -1190,6 +1212,8 @@ config CRYPTO_BLOWFISH_COMMON
 config CRYPTO_BLOWFISH_X86_64
 	tristate "Blowfish cipher algorithm (x86_64)"
 	depends on X86 && 64BIT
+	# Disable under KMSAN to prevent false positives from assembly.
+	depends on !KMSAN
 	select CRYPTO_BLKCIPHER
 	select CRYPTO_BLOWFISH_COMMON
 	help
@@ -1221,6 +1245,8 @@ config CRYPTO_CAMELLIA_X86_64
 	tristate "Camellia cipher algorithm (x86_64)"
 	depends on X86 && 64BIT
 	depends on CRYPTO
+	# Disable under KMSAN to prevent false positives from assembly.
+	depends on !KMSAN
 	select CRYPTO_BLKCIPHER
 	select CRYPTO_GLUE_HELPER_X86
 	help
@@ -1238,6 +1264,8 @@ config CRYPTO_CAMELLIA_AESNI_AVX_X86_64
 	tristate "Camellia cipher algorithm (x86_64/AES-NI/AVX)"
 	depends on X86 && 64BIT
 	depends on CRYPTO
+	# Disable under KMSAN to prevent false positives from assembly.
+	depends on !KMSAN
 	select CRYPTO_BLKCIPHER
 	select CRYPTO_CAMELLIA_X86_64
 	select CRYPTO_GLUE_HELPER_X86
@@ -1258,6 +1286,8 @@ config CRYPTO_CAMELLIA_AESNI_AVX2_X86_64
 	tristate "Camellia cipher algorithm (x86_64/AES-NI/AVX2)"
 	depends on X86 && 64BIT
 	depends on CRYPTO
+	# Disable under KMSAN to prevent false positives from assembly.
+	depends on !KMSAN
 	select CRYPTO_CAMELLIA_AESNI_AVX_X86_64
 	help
 	  Camellia cipher algorithm module (x86_64/AES-NI/AVX2).
@@ -1303,6 +1333,8 @@ config CRYPTO_CAST5
 config CRYPTO_CAST5_AVX_X86_64
 	tristate "CAST5 (CAST-128) cipher algorithm (x86_64/AVX)"
 	depends on X86 && 64BIT
+	# Disable under KMSAN to prevent false positives from assembly.
+	depends on !KMSAN
 	select CRYPTO_BLKCIPHER
 	select CRYPTO_CAST5
 	select CRYPTO_CAST_COMMON
@@ -1325,6 +1357,8 @@ config CRYPTO_CAST6
 config CRYPTO_CAST6_AVX_X86_64
 	tristate "CAST6 (CAST-256) cipher algorithm (x86_64/AVX)"
 	depends on X86 && 64BIT
+	# Disable under KMSAN to prevent false positives from assembly.
+	depends on !KMSAN
 	select CRYPTO_BLKCIPHER
 	select CRYPTO_CAST6
 	select CRYPTO_CAST_COMMON
@@ -1360,6 +1394,8 @@ config CRYPTO_DES_SPARC64
 config CRYPTO_DES3_EDE_X86_64
 	tristate "Triple DES EDE cipher algorithm (x86-64)"
 	depends on X86 && 64BIT
+	# Disable under KMSAN to prevent false positives from assembly.
+	depends on !KMSAN
 	select CRYPTO_BLKCIPHER
 	select CRYPTO_LIB_DES
 	help
@@ -1426,6 +1462,8 @@ config CRYPTO_CHACHA20
 config CRYPTO_CHACHA20_X86_64
 	tristate "ChaCha stream cipher algorithms (x86_64/SSSE3/AVX2/AVX-512VL)"
 	depends on X86 && 64BIT
+	# Disable under KMSAN to prevent false positives from assembly.
+	depends on !KMSAN
 	select CRYPTO_BLKCIPHER
 	select CRYPTO_CHACHA20
 	help
@@ -1462,6 +1500,8 @@ config CRYPTO_SERPENT
 config CRYPTO_SERPENT_SSE2_X86_64
 	tristate "Serpent cipher algorithm (x86_64/SSE2)"
 	depends on X86 && 64BIT
+	# Disable under KMSAN to prevent false positives from assembly.
+	depends on !KMSAN
 	select CRYPTO_BLKCIPHER
 	select CRYPTO_GLUE_HELPER_X86
 	select CRYPTO_SERPENT
@@ -1481,6 +1521,8 @@ config CRYPTO_SERPENT_SSE2_X86_64
 config CRYPTO_SERPENT_SSE2_586
 	tristate "Serpent cipher algorithm (i586/SSE2)"
 	depends on X86 && !64BIT
+	# Disable under KMSAN to prevent false positives from assembly.
+	depends on !KMSAN
 	select CRYPTO_BLKCIPHER
 	select CRYPTO_GLUE_HELPER_X86
 	select CRYPTO_SERPENT
@@ -1500,6 +1542,8 @@ config CRYPTO_SERPENT_SSE2_586
 config CRYPTO_SERPENT_AVX_X86_64
 	tristate "Serpent cipher algorithm (x86_64/AVX)"
 	depends on X86 && 64BIT
+	# Disable under KMSAN to prevent false positives from assembly.
+	depends on !KMSAN
 	select CRYPTO_BLKCIPHER
 	select CRYPTO_GLUE_HELPER_X86
 	select CRYPTO_SERPENT
@@ -1520,6 +1564,8 @@ config CRYPTO_SERPENT_AVX_X86_64
 config CRYPTO_SERPENT_AVX2_X86_64
 	tristate "Serpent cipher algorithm (x86_64/AVX2)"
 	depends on X86 && 64BIT
+	# Disable under KMSAN to prevent false positives from assembly.
+	depends on !KMSAN
 	select CRYPTO_SERPENT_AVX_X86_64
 	help
 	  Serpent cipher algorithm, by Anderson, Biham & Knudsen.
@@ -1615,6 +1661,8 @@ config CRYPTO_TWOFISH_586
 config CRYPTO_TWOFISH_X86_64
 	tristate "Twofish cipher algorithm (x86_64)"
 	depends on (X86 || UML_X86) && 64BIT
+	# Disable under KMSAN to prevent false positives from assembly.
+	depends on !KMSAN
 	select CRYPTO_ALGAPI
 	select CRYPTO_TWOFISH_COMMON
 	help
@@ -1631,6 +1679,8 @@ config CRYPTO_TWOFISH_X86_64
 config CRYPTO_TWOFISH_X86_64_3WAY
 	tristate "Twofish cipher algorithm (x86_64, 3-way parallel)"
 	depends on X86 && 64BIT
+	# Disable under KMSAN to prevent false positives from assembly.
+	depends on !KMSAN
 	select CRYPTO_BLKCIPHER
 	select CRYPTO_TWOFISH_COMMON
 	select CRYPTO_TWOFISH_X86_64
@@ -1652,6 +1702,8 @@ config CRYPTO_TWOFISH_X86_64_3WAY
 config CRYPTO_TWOFISH_AVX_X86_64
 	tristate "Twofish cipher algorithm (x86_64/AVX)"
 	depends on X86 && 64BIT
+	# Disable under KMSAN to prevent false positives from assembly.
+	depends on !KMSAN
 	select CRYPTO_BLKCIPHER
 	select CRYPTO_GLUE_HELPER_X86
 	select CRYPTO_SIMD
-- 
2.24.0.432.g9d3f5f5b63-goog



  parent reply index

Thread overview: 120+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-22 11:25 [PATCH RFC v3 00/36] Add KernelMemorySanitizer infrastructure glider
2019-11-22 11:25 ` [PATCH RFC v3 01/36] stackdepot: check depot_index before accessing the stack slab glider
2019-11-27 14:22   ` Marco Elver
2019-11-22 11:25 ` [PATCH RFC v3 02/36] stackdepot: build with -fno-builtin glider
2019-11-27 14:22   ` Marco Elver
2019-11-22 11:25 ` [PATCH RFC v3 03/36] kasan: stackdepot: move filter_irq_stacks() to stackdepot.c glider
2019-11-27 14:22   ` Marco Elver
2019-11-27 14:56     ` Alexander Potapenko
2019-11-22 11:25 ` [PATCH RFC v3 04/36] stackdepot: reserve 5 extra bits in depot_stack_handle_t glider
2019-11-27 14:23   ` Marco Elver
2019-11-22 11:25 ` [PATCH RFC v3 05/36] kmsan: add ReST documentation glider
2019-11-27 14:22   ` Marco Elver
2019-12-03 12:42     ` Alexander Potapenko
2019-11-22 11:25 ` [PATCH RFC v3 06/36] kmsan: gfp: introduce __GFP_NO_KMSAN_SHADOW glider
2019-11-27 14:48   ` Marco Elver
2019-12-03 12:57     ` Alexander Potapenko
2019-11-22 11:25 ` [PATCH RFC v3 07/36] kmsan: introduce __no_sanitize_memory and __SANITIZE_MEMORY__ glider
2019-11-28 13:13   ` Marco Elver
2019-11-29 16:09   ` Andrey Konovalov
2019-12-16 11:35     ` Alexander Potapenko
2019-11-22 11:25 ` [PATCH RFC v3 08/36] kmsan: reduce vmalloc space glider
2019-11-28 13:30   ` Marco Elver
2019-11-22 11:25 ` [PATCH RFC v3 09/36] kmsan: add KMSAN bits to struct page and struct task_struct glider
2019-11-28 13:44   ` Marco Elver
2019-11-28 14:05     ` Alexander Potapenko
2019-11-22 11:25 ` [PATCH RFC v3 10/36] kmsan: add KMSAN runtime glider
2019-11-24 19:44   ` Wolfram Sang
2019-11-25  9:14     ` Alexander Potapenko
2019-11-29 16:07   ` Marco Elver
2019-12-19 14:16     ` Alexander Potapenko
2019-12-02 15:39   ` Andrey Konovalov
2019-12-20 18:58     ` Alexander Potapenko
2019-12-03 14:34   ` Andrey Konovalov
2019-11-22 11:25 ` [PATCH RFC v3 11/36] kmsan: stackdepot: don't allocate KMSAN metadata for stackdepot glider
2019-11-29 14:52   ` Andrey Konovalov
2019-12-03 14:27     ` Alexander Potapenko
2019-11-22 11:25 ` [PATCH RFC v3 12/36] kmsan: define READ_ONCE_NOCHECK() glider
2019-12-02 10:03   ` Marco Elver
2019-12-03 12:45     ` Alexander Potapenko
2019-11-22 11:25 ` [PATCH RFC v3 13/36] kmsan: make READ_ONCE_TASK_STACK() return initialized values glider
2019-12-02 10:07   ` Marco Elver
2019-12-05 15:52     ` Alexander Potapenko
2019-11-22 11:25 ` [PATCH RFC v3 14/36] kmsan: x86: sync metadata pages on page fault glider
2019-11-22 11:26 ` [PATCH RFC v3 15/36] kmsan: add tests for KMSAN glider
2019-11-29 14:14   ` Andrey Konovalov
2019-12-05 14:30     ` Alexander Potapenko
2019-11-22 11:26 ` glider [this message]
2019-12-02 13:25   ` [PATCH RFC v3 16/36] crypto: kmsan: disable accelerated configs under KMSAN Marco Elver
2019-12-05 14:51     ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 17/36] kmsan: x86: disable UNWINDER_ORC " glider
2019-12-02 13:30   ` Marco Elver
2019-11-22 11:26 ` [PATCH RFC v3 18/36] kmsan: disable LOCK_DEBUGGING_SUPPORT glider
2019-12-02 13:33   ` Marco Elver
2019-12-03 14:34     ` Alexander Potapenko
2019-12-03 15:00       ` Qian Cai
2019-12-03 15:14         ` Alexander Potapenko
2019-12-03 18:02           ` Qian Cai
2019-12-03 18:38           ` Steven Rostedt
2019-12-04  8:41             ` Alexander Potapenko
2019-12-04 12:22               ` Petr Mladek
2019-12-04 13:12                 ` Qian Cai
2019-12-04 16:24                   ` Alexander Potapenko
2019-12-04 18:03                     ` Qian Cai
2019-11-22 11:26 ` [PATCH RFC v3 20/36] kmsan: x86: increase stack sizes in KMSAN builds glider
2019-12-02 14:31   ` Marco Elver
2019-11-22 11:26 ` [PATCH RFC v3 21/36] kmsan: disable KMSAN instrumentation for certain kernel parts glider
2019-11-29 15:07   ` Andrey Konovalov
2019-12-10 10:35     ` Alexander Potapenko
2019-12-10 12:38       ` Alexander Potapenko
2019-12-10 12:43       ` Qian Cai
2019-11-22 11:26 ` [PATCH RFC v3 22/36] kmsan: mm: call KMSAN hooks from SLUB code glider
2019-12-02 15:36   ` Marco Elver
2019-12-10 12:07     ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 23/36] kmsan: call KMSAN hooks where needed glider
2019-11-26 10:17   ` Petr Mladek
2019-11-26 10:52     ` Alexander Potapenko
2019-11-29 16:21   ` Andrey Konovalov
2019-12-16 11:30     ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 24/36] kmsan: disable instrumentation of certain functions glider
2019-11-29 14:59   ` Andrey Konovalov
2019-12-18 10:02     ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 25/36] kmsan: unpoison |tlb| in arch_tlb_gather_mmu() glider
2019-11-29 15:08   ` Andrey Konovalov
2019-12-03 14:19     ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 26/36] kmsan: use __msan_memcpy() where possible glider
2019-11-29 15:13   ` Andrey Konovalov
2019-12-05 15:46     ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 27/36] kmsan: hooks for copy_to_user() and friends glider
2019-11-29 15:34   ` Andrey Konovalov
2019-12-05 16:00     ` Alexander Potapenko
2019-12-05 16:44       ` Andrey Konovalov
2019-12-11 14:22         ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 28/36] kmsan: enable KMSAN builds glider
2019-11-29 15:55   ` Andrey Konovalov
2019-12-11 12:51     ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 29/36] kmsan: handle /dev/[u]random glider
2019-11-22 11:26 ` [PATCH RFC v3 30/36] kmsan: virtio: check/unpoison scatterlist in vring_map_one_sg() glider
2019-11-22 11:26 ` [PATCH RFC v3 31/36] kmsan: disable strscpy() optimization under KMSAN glider
2019-12-02 15:51   ` Marco Elver
2019-12-02 16:23     ` Alexander Potapenko
2019-12-03 11:19       ` Alexander Potapenko
2019-12-03 11:24         ` Marco Elver
2019-12-03 11:27           ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 32/36] kmsan: add iomap support glider
2019-12-03 12:50   ` Marco Elver
2019-12-03 14:07     ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 33/36] kmsan: dma: unpoison memory mapped by dma_direct_map_page() glider
2019-11-22 11:26 ` [PATCH RFC v3 34/36] kmsan: disable physical page merging in biovec glider
2019-12-03 12:54   ` Marco Elver
2019-12-03 13:38     ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 35/36] kmsan: ext4: skip block merging logic in ext4_mpage_readpages for KMSAN glider
2019-11-25 16:05   ` Robin Murphy
2019-11-25 17:03     ` Alexander Potapenko
2019-12-03 14:22   ` Marco Elver
2019-12-05 14:31     ` Alexander Potapenko
2019-11-22 11:26 ` [PATCH RFC v3 36/36] net: kasan: kmsan: support CONFIG_GENERIC_CSUM on x86, enable it for KASAN/KMSAN glider
2019-12-03 14:17   ` Marco Elver
2019-12-05 14:37     ` Alexander Potapenko
2019-11-29 14:39 ` [PATCH RFC v3 00/36] Add KernelMemorySanitizer infrastructure Marco Elver
2019-12-02 16:02   ` Alexander Potapenko

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    --cc=viro@zeniv.linux.org.uk \
    --cc=willy@infradead.org \
    --cc=wsa@the-dreams.de \
    /path/to/YOUR_REPLY

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Linux-mm Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-mm/0 linux-mm/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-mm linux-mm/ https://lore.kernel.org/linux-mm \
		linux-mm@kvack.org
	public-inbox-index linux-mm

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kvack.linux-mm


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git