From d0a00ce470e3ea19ba3b9f1c390aee739570a44a Mon Sep 17 00:00:00 2001 From: Steven Chen Date: Mon, 21 Apr 2025 15:25:13 -0700 Subject: [PATCH] ima: verify if the segment size has changed kexec 'load' may be called multiple times. Free and realloc the buffer only if the segment_size is changed from the previous kexec 'load' call. Signed-off-by: Steven Chen Reviewed-by: Stefan Berger Acked-by: Baoquan He Tested-by: Stefan Berger # ppc64/kvm Signed-off-by: Mimi Zohar --- security/integrity/ima/ima_kexec.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c index 5c3b3e0b2186..ed867734ee70 100644 --- a/security/integrity/ima/ima_kexec.c +++ b/security/integrity/ima/ima_kexec.c @@ -33,6 +33,14 @@ static void ima_free_kexec_file_buf(struct seq_file *sf) static int ima_alloc_kexec_file_buf(size_t segment_size) { + /* + * kexec 'load' may be called multiple times. + * Free and realloc the buffer only if the segment_size is + * changed from the previous kexec 'load' call. + */ + if (ima_kexec_file.buf && ima_kexec_file.size == segment_size) + goto out; + ima_free_kexec_file_buf(&ima_kexec_file); /* segment size can't change between kexec load and execute */ @@ -41,6 +49,8 @@ static int ima_alloc_kexec_file_buf(size_t segment_size) return -ENOMEM; ima_kexec_file.size = segment_size; + +out: ima_kexec_file.read_pos = 0; ima_kexec_file.count = sizeof(struct ima_kexec_hdr); /* reserved space */ -- 2.51.0