The patch titled Subject: kernel/kexec: fix IMA when allocation happens in CMA area has been added to the -mm mm-hotfixes-unstable branch. Its filename is kernel-kexec-fix-ima-when-allocation-happens-in-cma-area.patch
This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...
This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------ From: Pingfan Liu piliu@redhat.com Subject: kernel/kexec: fix IMA when allocation happens in CMA area Date: Thu, 6 Nov 2025 14:59:04 +0800
When I tested kexec with the latest kernel, I ran into the following warning:
[ 40.712410] ------------[ cut here ]------------ [ 40.712576] WARNING: CPU: 2 PID: 1562 at kernel/kexec_core.c:1001 kimage_map_segment+0x144/0x198 [...] [ 40.816047] Call trace: [ 40.818498] kimage_map_segment+0x144/0x198 (P) [ 40.823221] ima_kexec_post_load+0x58/0xc0 [ 40.827246] __do_sys_kexec_file_load+0x29c/0x368 [...] [ 40.855423] ---[ end trace 0000000000000000 ]---
This is caused by the fact that kexec allocates the destination directly in the CMA area. In that case, the CMA kernel address should be exported directly to the IMA component, instead of using the vmalloc'd address.
Link: https://lkml.kernel.org/r/20251106065904.10772-2-piliu@redhat.com Fixes: 07d24902977e ("kexec: enable CMA based contiguous allocation") Signed-off-by: Pingfan Liu piliu@redhat.com Cc: Baoquan He bhe@redhat.com Cc: Alexander Graf graf@amazon.com Cc: Steven Chen chenste@linux.microsoft.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---
kernel/kexec_core.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
--- a/kernel/kexec_core.c~kernel-kexec-fix-ima-when-allocation-happens-in-cma-area +++ a/kernel/kexec_core.c @@ -967,6 +967,7 @@ void *kimage_map_segment(struct kimage * kimage_entry_t *ptr, entry; struct page **src_pages; unsigned int npages; + struct page *cma; void *vaddr = NULL; int i;
@@ -974,6 +975,9 @@ void *kimage_map_segment(struct kimage * size = image->segment[idx].memsz; eaddr = addr + size;
+ cma = image->segment_cma[idx]; + if (cma) + return page_address(cma); /* * Collect the source pages and map them in a contiguous VA range. */ @@ -1014,7 +1018,8 @@ void *kimage_map_segment(struct kimage *
void kimage_unmap_segment(void *segment_buffer) { - vunmap(segment_buffer); + if (is_vmalloc_addr(segment_buffer)) + vunmap(segment_buffer); }
struct kexec_load_limit { _
Patches currently in -mm which might be from piliu@redhat.com are
kernel-kexec-change-the-prototype-of-kimage_map_segment.patch kernel-kexec-fix-ima-when-allocation-happens-in-cma-area.patch