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On Mon, Dec 01, 2025 at 10:51:18AM +0000, Yeoreum Yun wrote: > Commit bf454ec31add ("kexec_file: allow to place kexec_buf randomly") > introduced the kexec_buf->random field to enable random placement of > kexec_buf. > > However, this field was never properly initialized for kexec images > that do not need to be placed randomly, leading to the following UBSAN > warning: > > [ +0.364528] ------------[ cut here ]------------ > [ +0.000019] UBSAN: invalid-load in ./include/linux/kexec.h:210:12 > [ +0.000131] load of value 2 is not a valid value for type 'bool' (aka '_Bool') > [ +0.000003] CPU: 4 UID: 0 PID: 927 Comm: kexec Not tainted 6.18.0-rc7+ #3 PREEMPT(full) > [ +0.000002] Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015 > [ +0.000000] Call trace: > [ +0.000001] show_stack+0x24/0x40 (C) > [ +0.000006] __dump_stack+0x28/0x48 > [ +0.000002] dump_stack_lvl+0x7c/0xb0 > [ +0.000002] dump_stack+0x18/0x34 > [ +0.000001] ubsan_epilogue+0x10/0x50 > [ +0.000002] __ubsan_handle_load_invalid_value+0xc8/0xd0 > [ +0.000003] locate_mem_hole_callback+0x28c/0x2a0 > [ +0.000003] kexec_locate_mem_hole+0xf4/0x2f0 > [ +0.000001] kexec_add_buffer+0xa8/0x178 > [ +0.000002] image_load+0xf0/0x258 > [ +0.000001] __arm64_sys_kexec_file_load+0x510/0x718 > [ +0.000002] invoke_syscall+0x68/0xe8 > [ +0.000001] el0_svc_common+0xb0/0xf8 > [ +0.000002] do_el0_svc+0x28/0x48 > [ +0.000001] el0_svc+0x40/0xe8 > [ +0.000002] el0t_64_sync_handler+0x84/0x140 > [ +0.000002] el0t_64_sync+0x1bc/0x1c0 > > To address this, initialise kexec_buf->random field properly. > > Fixes: bf454ec31add ("kexec_file: allow to place kexec_buf randomly") > Suggested-by: Breno Leitao > Cc: > Signed-off-by: Yeoreum Yun > --- > arch/arm64/kernel/kexec_image.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/arm64/kernel/kexec_image.c b/arch/arm64/kernel/kexec_image.c > index 532d72ea42ee..b70f4df15a1a 100644 > --- a/arch/arm64/kernel/kexec_image.c > +++ b/arch/arm64/kernel/kexec_image.c > @@ -41,7 +41,7 @@ static void *image_load(struct kimage *image, > struct arm64_image_header *h; > u64 flags, value; > bool be_image, be_kernel; > - struct kexec_buf kbuf; > + struct kexec_buf kbuf = {}; > unsigned long text_offset, kernel_segment_number; > struct kexec_segment *kernel_segment; > int ret; > -- > LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7} > -- Sincerely, Yeoreum Yun