With Chrome OS the kernel setup block is stored in a separate place from the kernel, so it is not possible to access the kernel version string. At present, garbage is printed.
Add a sanity check to avoid this.
Signed-off-by: Simon Glass sjg@chromium.org Reviewed-by: Bin Meng bmeng.cn@gmail.com ---
(no changes since v1)
arch/x86/lib/zimage.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/arch/x86/lib/zimage.c b/arch/x86/lib/zimage.c index 7418c9a5fed..d425ded596d 100644 --- a/arch/x86/lib/zimage.c +++ b/arch/x86/lib/zimage.c @@ -31,6 +31,7 @@ #include <asm/arch/timestamp.h> #endif #include <linux/compiler.h> +#include <linux/ctype.h> #include <linux/libfdt.h>
/* @@ -175,11 +176,19 @@ static const char *get_kernel_version(struct boot_params *params, { struct setup_header *hdr = ¶ms->hdr; int bootproto; + const char *s, *end;
bootproto = get_boot_protocol(hdr, false); if (bootproto < 0x0200 || hdr->setup_sects < 15) return NULL;
+ /* sanity-check the kernel version in case it is missing */ + for (s = kernel_base + hdr->kernel_version + 0x200, end = s + 0x100; *s; + s++) { + if (!isprint(*s)) + return NULL; + } + return kernel_base + hdr->kernel_version + 0x200; }