From: Baoquan He bhe@redhat.com
commit 4aa9340584e37debef06fa99b56d064beb723891 upstream.
unreferenced object 0x38000195000 (size 4096): comm "kexec", pid 8548, jiffies 4294953647 (age 32443.270s) hex dump (first 32 bytes): 00 00 00 c8 20 00 00 00 00 00 00 c0 02 80 00 00 .... ........... 40 40 40 40 40 40 40 40 00 00 00 00 00 00 00 00 @@@@@@@@........ backtrace: [<0000000011a2f199>] __vmalloc_node_range+0xc0/0x140 [<0000000081fa2752>] vzalloc+0x5a/0x70 [<0000000063a4c92d>] ipl_report_finish+0x2c/0x180 [<00000000553304da>] kexec_file_add_ipl_report+0xf4/0x150 [<00000000862d033f>] kexec_file_add_components+0x124/0x160 [<000000000d2717bb>] arch_kexec_kernel_image_load+0x62/0x90 [<000000002e0373b6>] kimage_file_alloc_init+0x1aa/0x2e0 [<0000000060f2d14f>] __do_sys_kexec_file_load+0x17c/0x2c0 [<000000008c86fe5a>] __s390x_sys_kexec_file_load+0x40/0x50 [<000000001fdb9dac>] __do_syscall+0x1bc/0x1f0 [<000000003ee4258d>] system_call+0x78/0xa0
Signed-off-by: Baoquan He bhe@redhat.com Reviewed-by: Philipp Rudo prudo@redhat.com Fixes: 99feaa717e55 ("s390/kexec_file: Create ipl report and pass to next kernel") Cc: stable@vger.kernel.org # v5.2: 20c76e242e70: s390/kexec: fix return code handling Cc: stable@vger.kernel.org # v5.2 Link: https://lore.kernel.org/r/20211116033101.GD21646@MiWiFi-R3L-srv Signed-off-by: Heiko Carstens hca@linux.ibm.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/s390/include/asm/kexec.h | 6 ++++++ arch/s390/kernel/machine_kexec_file.c | 10 ++++++++++ 2 files changed, 16 insertions(+)
--- a/arch/s390/include/asm/kexec.h +++ b/arch/s390/include/asm/kexec.h @@ -74,6 +74,12 @@ void *kexec_file_add_components(struct k int arch_kexec_do_relocs(int r_type, void *loc, unsigned long val, unsigned long addr);
+#define ARCH_HAS_KIMAGE_ARCH + +struct kimage_arch { + void *ipl_buf; +}; + extern const struct kexec_file_ops s390_kexec_image_ops; extern const struct kexec_file_ops s390_kexec_elf_ops;
--- a/arch/s390/kernel/machine_kexec_file.c +++ b/arch/s390/kernel/machine_kexec_file.c @@ -12,6 +12,7 @@ #include <linux/kexec.h> #include <linux/module_signature.h> #include <linux/verification.h> +#include <linux/vmalloc.h> #include <asm/boot_data.h> #include <asm/ipl.h> #include <asm/setup.h> @@ -206,6 +207,7 @@ static int kexec_file_add_ipl_report(str goto out; buf.bufsz = data->report->size; buf.memsz = buf.bufsz; + image->arch.ipl_buf = buf.buffer;
data->memsz += buf.memsz;
@@ -327,3 +329,11 @@ int arch_kexec_kernel_image_probe(struct
return kexec_image_probe_default(image, buf, buf_len); } + +int arch_kimage_file_post_load_cleanup(struct kimage *image) +{ + vfree(image->arch.ipl_buf); + image->arch.ipl_buf = NULL; + + return kexec_image_post_load_cleanup_default(image); +}