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Harding" , Vineet Gupta , Will Deacon , Willem de Bruijn Subject: [PATCH v2] lib: fix bitmap_parse() on 64-bit big endian archs Date: Mon, 8 Jun 2020 18:41:11 +0200 Message-Id: <1591634471-17647-1-git-send-email-agordeev@linux.ibm.com> X-Mailer: git-send-email 1.8.3.1 X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216,18.0.687 definitions=2020-06-08_14:2020-06-08,2020-06-08 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 clxscore=1011 malwarescore=0 spamscore=0 bulkscore=0 priorityscore=1501 adultscore=0 mlxlogscore=999 impostorscore=0 suspectscore=1 cotscore=-2147483648 lowpriorityscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2006080117 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit 2d6261583be0 ("lib: rework bitmap_parse()") does not take into account order of halfwords on 64-bit big endian architectures. As result (at least) Receive Packet Steering, IRQ affinity masks and runtime kernel test "test_bitmap" get broken on s390. Fixes: 2d6261583be0 ("lib: rework bitmap_parse()") Cc: stable@vger.kernel.org Cc: Andrew Morton Cc: Yury Norov Cc: Andy Shevchenko Cc: Amritha Nambiar Cc: Arnaldo Carvalho de Melo Cc: Chris Wilson Cc: Kees Cook Cc: Matthew Wilcox Cc: Miklos Szeredi Cc: Rasmus Villemoes Cc: Steffen Klassert Cc: "Tobin C . Harding" Cc: Vineet Gupta Cc: Will Deacon Cc: Willem de Bruijn Signed-off-by: Alexander Gordeev --- lib/bitmap.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/lib/bitmap.c b/lib/bitmap.c index 89260aa342d6..80d26b183248 100644 --- a/lib/bitmap.c +++ b/lib/bitmap.c @@ -739,6 +739,7 @@ int bitmap_parse(const char *start, unsigned int buflen, const char *end = strnchrnul(start, buflen, '\n') - 1; int chunks = BITS_TO_U32(nmaskbits); u32 *bitmap = (u32 *)maskp; + int chunk = 0; int unset_bit; while (1) { @@ -749,9 +750,14 @@ int bitmap_parse(const char *start, unsigned int buflen, if (!chunks--) return -EOVERFLOW; - end = bitmap_get_x32_reverse(start, end, bitmap++); +#if defined(CONFIG_64BIT) && defined(__BIG_ENDIAN) + end = bitmap_get_x32_reverse(start, end, &bitmap[chunk ^ 1]); +#else + end = bitmap_get_x32_reverse(start, end, &bitmap[chunk]); +#endif if (IS_ERR(end)) return PTR_ERR(end); + chunk++; } unset_bit = (BITS_TO_U32(nmaskbits) - chunks) * 32; -- 2.23.0