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Fri, 01 May 2026 02:49:38 -0700 (PDT) From: Cris Jacob Maamor To: Mike Rapoport , Pasha Tatashin , Pratyush Yadav Cc: Alexander Graf , Andrew Morton , Dan Carpenter , Greg Kroah-Hartman , kexec@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH RFC 3/5] liveupdate: validate restored LUO session metadata Date: Fri, 1 May 2026 17:46:35 +0800 Message-ID: <20260501094637.38650-4-crisjacobmaamor@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260501094637.38650-1-crisjacobmaamor@gmail.com> References: <20260501094637.38650-1-crisjacobmaamor@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: woxeg8kzzrs4foq3476iuhn36qus6wwk X-Rspam-User: X-Rspamd-Queue-Id: 2EAA91A0006 X-Rspamd-Server: rspam07 X-HE-Tag: 1777628979-574488 X-HE-Meta: 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 gBFnQsZ6 leamsL/kVSxUPKNVN7ab4tQZ33sgidbhWPRpOxd8o/bP5/8YX0Nn90Km70rnuD7qxtVO0t6nhhwt6KTqSgYQ5ufcuxXvR3njrj0IiMUu4WlyY/y03dlW760c/vIqhZAkP6KYj7Bap160oL4EIcEYbo6dSbsra+QxTt57TgFGkx8zU/aAcFlLfz+2gcMdA4e5kEEKqFiwFQEG06Stj9Pn4C1NeotvVRHvTjBxxz+aNOqRq2lIR2zcQCKwd0eQsxGaVccapAkL0E7Uq93GqkdF05h5N2lOV8upE2YMyX+Ub1ikWeptN5qdQBNu6FLZ0Y+LV0jQxruy1lHa5R6cCoR6MtACmiqL48ZbCHy1KAfbs4SCoXKEDm0aOAv7N0TBJzrAkCIiyaEfUuVftdtDvPLQGvqfUxzuGjSYgr1FV+uYw9v1OiyoX1RlhxxidCaA4B7HKuQzcJB9GXKp1P8U= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Signed-off-by: Cris Jacob Maamor --- kernel/liveupdate/luo_session.c | 22 ++++++++++++++++++++-- 1 file changed, 20 insertions(+), 2 deletions(-) diff --git a/kernel/liveupdate/luo_session.c b/kernel/liveupdate/luo_session.c index a3327a28fc1f..0244c071936d 100644 --- a/kernel/liveupdate/luo_session.c +++ b/kernel/liveupdate/luo_session.c @@ -501,7 +501,18 @@ int __init luo_session_setup_incoming(void *fdt_in) } header_ser_pa = get_unaligned((u64 *)ptr); + if (!kho_is_preserved(header_ser_pa, LUO_SESSION_PGCNT)) { + pr_err("Session header is not KHO preserved: %#llx\n", + (unsigned long long)header_ser_pa); + return -EINVAL; + } + header_ser = phys_to_virt(header_ser_pa); + if (header_ser->count > LUO_SESSION_MAX) { + pr_err("Invalid session count: %llu\n", + (unsigned long long)header_ser->count); + return -EINVAL; + } luo_session_global.incoming.header_ser = header_ser; luo_session_global.incoming.ser = (void *)(header_ser + 1); @@ -515,6 +526,7 @@ int luo_session_deserialize(void) struct luo_session_header *sh = &luo_session_global.incoming; static bool is_deserialized; static int err; + u64 count; /* If has been deserialized, always return the same error code */ if (is_deserialized) @@ -524,6 +536,13 @@ int luo_session_deserialize(void) if (!sh->active) return 0; + count = sh->header_ser->count; + if (count > LUO_SESSION_MAX) { + pr_err("Invalid session count: %llu\n", + (unsigned long long)count); + return -EINVAL; + } + /* * Note on error handling: * @@ -539,7 +558,7 @@ int luo_session_deserialize(void) * userspace to detect the failure and trigger a reboot, which will * reliably reset devices and reclaim memory. */ - for (int i = 0; i < sh->header_ser->count; i++) { + for (u64 i = 0; i < count; i++) { struct luo_session *session; session = luo_session_alloc(sh->ser[i].name); @@ -606,4 +625,3 @@ int luo_session_serialize(void) return err; } - -- 2.53.0