From: Sven Schnelle <svens@xxxxxxxxxxxxx>
commit 277c8389386e2ccb8417afe4e36f67fc5dcd735d upstream.
In preparation of adding support for command lines with variable
sizes on s390, the check whether the new kernel image is at least HEAD_END
bytes long isn't correct. Move the check to kexec_file_add_components()
so we can get the size of the parm area and check the size there.
The '.org HEAD_END' directive can now also be removed from head.S. This
was used in the past to reserve space for the early sccb buffer, but with
commit f1d3c5323772 ("s390/boot: move sclp early buffer from fixed address
in asm to C") this is no longer required.
Signed-off-by: Sven Schnelle <svens@xxxxxxxxxxxxx>
Reviewed-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
Signed-off-by: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Signed-off-by: Michal Suchanek <msuchanek@xxxxxxx>
---
arch/s390/boot/head.S | 2 --
arch/s390/include/asm/setup.h | 1 -
arch/s390/kernel/machine_kexec_file.c | 17 ++---------------
3 files changed, 2 insertions(+), 18 deletions(-)
diff --git a/arch/s390/boot/head.S b/arch/s390/boot/head.S
index 40f4cff538b8..f3a8dba7dd5d 100644
--- a/arch/s390/boot/head.S
+++ b/arch/s390/boot/head.S
@@ -383,5 +383,3 @@ SYM_DATA_START(parmarea)
.byte 0
.org PARMAREA+__PARMAREA_SIZE
SYM_DATA_END(parmarea)
-
- .org HEAD_END
diff --git a/arch/s390/include/asm/setup.h b/arch/s390/include/asm/setup.h
index b6606ffd85d8..121e1a8c41d7 100644
--- a/arch/s390/include/asm/setup.h
+++ b/arch/s390/include/asm/setup.h
@@ -11,7 +11,6 @@
#include <linux/build_bug.h>
#define PARMAREA 0x10400
-#define HEAD_END 0x11000
/*
* Machine features detected in early.c
diff --git a/arch/s390/kernel/machine_kexec_file.c b/arch/s390/kernel/machine_kexec_file.c
index 3459362c54ac..29a9178ff0d4 100644
--- a/arch/s390/kernel/machine_kexec_file.c
+++ b/arch/s390/kernel/machine_kexec_file.c
@@ -243,7 +243,8 @@ void *kexec_file_add_components(struct kimage *image,
if (ret)
goto out;
- if (image->cmdline_buf_len >= ARCH_COMMAND_LINE_SIZE) {
+ if (image->kernel_buf_len < PARMAREA + sizeof(struct parmarea) ||
+ image->cmdline_buf_len >= ARCH_COMMAND_LINE_SIZE) {
ret = -EINVAL;
goto out;
}
@@ -333,20 +334,6 @@ int arch_kexec_apply_relocations_add(struct purgatory_info *pi,
return 0;
}
-int arch_kexec_kernel_image_probe(struct kimage *image, void *buf,
- unsigned long buf_len)
-{
- /* A kernel must be at least large enough to contain head.S. During
- * load memory in head.S will be accessed, e.g. to register the next
- * command line. If the next kernel were smaller the current kernel
- * will panic at load.
- */
- if (buf_len < HEAD_END)
- return -ENOEXEC;
-
- return kexec_image_probe_default(image, buf, buf_len);
-}
-
int arch_kimage_file_post_load_cleanup(struct kimage *image)
{
vfree(image->arch.ipl_buf);
--
2.35.3
