The following commit has been merged into the x86/urgent branch of tip:

Commit-ID:     5849cdf8c120e3979c57d34be55b92d90a77a47e
Author:        Mike Galbraith <>
AuthorDate:    Fri, 16 Apr 2021 14:02:07 +02:00
Committer:     Borislav Petkov <>
CommitterDate: Tue, 20 Apr 2021 17:32:46 +02:00

x86/crash: Fix crash_setup_memmap_entries() out-of-bounds access

Commit in Fixes: added support for kexec-ing a kernel on panic using a
new system call. As part of it, it does prepare a memory map for the new

However, while doing so, it wrongly accesses memory it has not
allocated: it accesses the first element of the cmem->ranges[] array in
memmap_exclude_ranges() but it has not allocated the memory for it in
crash_setup_memmap_entries(). As KASAN reports:

  BUG: KASAN: vmalloc-out-of-bounds in crash_setup_memmap_entries+0x17e/0x3a0
  Write of size 8 at addr ffffc90000426008 by task kexec/1187

  (gdb) list *crash_setup_memmap_entries+0x17e
  0xffffffff8107cafe is in crash_setup_memmap_entries 
  317                                      unsigned long long mend)
  318     {
  319             unsigned long start, end;
  321             cmem->ranges[0].start = mstart;
  322             cmem->ranges[0].end = mend;
  323             cmem->nr_ranges = 1;
  325             /* Exclude elf header region */
  326             start = image->arch.elf_load_addr;

Make sure the ranges array becomes a single element allocated.

 [ bp: Write a proper commit message. ]

Fixes: dd5f726076cc ("kexec: support for kexec on panic using new system call")
Signed-off-by: Mike Galbraith <>
Signed-off-by: Borislav Petkov <>
Reviewed-by: Dave Young <>
Cc: <>
 arch/x86/kernel/crash.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c
index a8f3af2..b1deacb 100644
--- a/arch/x86/kernel/crash.c
+++ b/arch/x86/kernel/crash.c
@@ -337,7 +337,7 @@ int crash_setup_memmap_entries(struct kimage *image, struct 
boot_params *params)
        struct crash_memmap_data cmd;
        struct crash_mem *cmem;
-       cmem = vzalloc(sizeof(struct crash_mem));
+       cmem = vzalloc(struct_size(cmem, ranges, 1));
        if (!cmem)
                return -ENOMEM;

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