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Wed, 6 May 2026 14:33:46 +0000 (GMT) Message-ID: <23784559-1e11-4e14-bf23-6ffebd7b2d30@linux.ibm.com> Date: Wed, 6 May 2026 20:03:44 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 7/9] crash_dump: Improve readability of config_keys_restore_store To: Coiby Xu , kexec@lists.infradead.org Cc: Andrew Morton , Baoquan He , Dave Young , Mike Rapoport , Pasha Tatashin , Pratyush Yadav , Coiby Xu , open list References: <20260501234342.2518281-1-coiby.xu@gmail.com> <20260501234342.2518281-8-coiby.xu@gmail.com> Content-Language: en-US From: Sourabh Jain In-Reply-To: <20260501234342.2518281-8-coiby.xu@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTA2MDEzOSBTYWx0ZWRfX3eMw0+MkNrHj E5OesnVX0cE3eyAYoM333wb4ckoS8BPnUsKs16I2YZbY0WgNWr3WAWaH1XjP4jrRN2uCakfoCbb Qz7PKv8OAfFGe2aipUz/4AoWpGTTHAcTLFem+CjK2bdvL8GcSPUBFS6qQy63GJtkIg6/B1h+j0s zSuMnMrBZTpNz+G7jbv54Ltu7LyT+0NuJK+UOKE3RGX5wKChti8XNttfsr6V2AlPgrnKQjKZElE CEz6xJzajROf4YLby/g8/KXVjsjcvlYlbDG8G8gdxyf6Xw+hgcJjNhwmTpVoA/FBtYRH94Qlg5f 9z7xusUGcd0Jrp6jlZNPE8Pe81VwEbEjBv5ombxFAQC6LqwZrpg32BsPWgnSkykPxkUDu1VXlj6 BC6y7KxcDam7ft0lCBigKXsZlgf6w5PoX+pSY+lDs6xirVumQMp21g/L0XFqFiYNCpZd/7XEERT qpwkoXt0osFYRnU79ww== X-Proofpoint-ORIG-GUID: jJN_-9ggJJLQRngugQXjIPG0B-DpvNne X-Proofpoint-GUID: Q1rK92zJdTSiNgq7akaad138bPJcbYCj X-Authority-Analysis: v=2.4 cv=W7UIkxWk c=1 sm=1 tr=0 ts=69fb5151 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=IkcTkHD0fZMA:10 a=NGcC8JguVDcA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=pGLkceISAAAA:8 a=LpzC2sJZ3Km07TKc-7cA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-05-05_03,2026-05-06_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 adultscore=0 lowpriorityscore=0 malwarescore=0 suspectscore=0 spamscore=0 clxscore=1015 phishscore=0 bulkscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2605060139 On 02/05/26 05:13, Coiby Xu wrote: > config_keys_restore_store currently doesn't validate the user input > before restoring dm-crypt keys. Although it's not necessary for the case > of vmcore dumping, it's better to do it for the sake of consistency and > code readability. Also check the return code of > restore_dm_crypt_keys_to_thread_keyring. > > Fixes: 62f17d9df692 ("crash_dump: retrieve dm crypt keys in kdump kernel") > Signed-off-by: Coiby Xu > --- > kernel/crash_dump_dm_crypt.c | 10 +++++++--- > 1 file changed, 7 insertions(+), 3 deletions(-) > > diff --git a/kernel/crash_dump_dm_crypt.c b/kernel/crash_dump_dm_crypt.c > index 545d712428d3..36e51807d94f 100644 > --- a/kernel/crash_dump_dm_crypt.c > +++ b/kernel/crash_dump_dm_crypt.c > @@ -358,12 +358,16 @@ static ssize_t config_keys_restore_show(struct config_item *item, char *page) > static ssize_t config_keys_restore_store(struct config_item *item, > const char *page, size_t count) > { > - if (!restore) > - restore_dm_crypt_keys_to_thread_keyring(); > + bool val; > > - if (kstrtobool(page, &restore)) > + if (kstrtobool(page, &val)) > return -EINVAL; > > + if (val && !restore) { > + if (!restore_dm_crypt_keys_to_thread_keyring()) > + restore = true; > + } Nit: I think it would be good to warn the user if they try to restore it when it has already been restored. - Sourabh Jain > + > return count; > } >