Presently ima_get_kexec_buffer() doesn't check if the previous kernel's
ima-kexec-buffer lies outside the addressable memory range. This can result
in a kernel panic if the new kernel is booted with 'mem=X' arg and the
ima-kexec-buffer was allocated beyond that range by the previous kernel.
The panic is usually of the form below:
$ sudo kexec --initrd initrd vmlinux --append='mem=16G'
<snip>
BUG: Unable to handle kernel data access on read at 0xc000c01fff7f0000
Faulting instruction address: 0xc000000000837974
Oops: Kernel access of bad area, sig: 11 [#1]
<snip>
NIP [c000000000837974] ima_restore_measurement_list+0x94/0x6c0
LR [c00000000083b55c] ima_load_kexec_buffer+0xac/0x160
Call Trace:
[c00000000371fa80] [c00000000083b55c] ima_load_kexec_buffer+0xac/0x160
[c00000000371fb00] [c0000000020512c4] ima_init+0x80/0x108
[c00000000371fb70] [c0000000020514dc] init_ima+0x4c/0x120
[c00000000371fbf0] [c000000000012240] do_one_initcall+0x60/0x2c0
[c00000000371fcc0] [c000000002004ad0] kernel_init_freeable+0x344/0x3ec
[c00000000371fda0] [c0000000000128a4] kernel_init+0x34/0x1b0
[c00000000371fe10] [c00000000000ce64] ret_from_kernel_thread+0x5c/0x64
Instruction dump:
f92100b8 f92100c0 90e10090 910100a0 4182050c 282a0017 3bc00000 40810330
7c0802a6 fb610198 7c9b2378 f80101d0 <a1240000> 2c090001 40820614 e9240010
---[ end trace 0000000000000000 ]---
Fix this issue by checking returned address/size of previous kernel's
ima-kexec-buffer against memblock's memory bounds.
Fixes: fee3ff99bc67("powerpc: Move arch independent ima kexec functions to
drivers/of/kexec.c")
Cc: Frank Rowand <frowand.list@xxxxxxxxx>
Cc: Prakhar Srivastava <prsriva@xxxxxxxxxxxxxxxxxxx>
Cc: Lakshmi Ramasubramanian <nramas@xxxxxxxxxxxxxxxxxxx>
Cc: Thiago Jung Bauermann <bauerman@xxxxxxxxxxxxx>
Cc: Rob Herring <robh@xxxxxxxxxx>
Signed-off-by: Vaibhav Jain <vaibhav@xxxxxxxxxxxxx>
---
drivers/of/kexec.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/of/kexec.c b/drivers/of/kexec.c
index b9bd1cff1793..c73007eda52d 100644
--- a/drivers/of/kexec.c
+++ b/drivers/of/kexec.c
@@ -140,6 +140,13 @@ int ima_get_kexec_buffer(void **addr, size_t *size)
if (ret)
return ret;
+ /* if the ima-kexec-buffer goes beyond the addressable memory */
+ if (!memblock_is_region_memory(tmp_addr, tmp_size)) {
+ pr_warn("IMA buffer at 0x%lx, size = 0x%zx beyond memory\n",
+ tmp_addr, tmp_size);
+ return -EINVAL;
+ }
+
*addr = __va(tmp_addr);
*size = tmp_size;
--
2.35.1
