The patch titled
Subject: kexec: return error if file bytes are less then file size
has been added to the -mm tree. Its filename is
kexec-implementation-of-new-syscall-kexec_file_load-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/kexec-implementation-of-new-syscall-kexec_file_load-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/kexec-implementation-of-new-syscall-kexec_file_load-fix.patch
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------------------------------------------------------
From: Vivek Goyal <vgoyal@xxxxxxxxxx>
Subject: kexec: return error if file bytes are less then file size
If number of bytes read from file are not same as file size, return error.
Signed-off-by: Vivek Goyal <vgoyal@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/kexec.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff -puN kernel/kexec.c~kexec-implementation-of-new-syscall-kexec_file_load-fix kernel/kexec.c
--- a/kernel/kexec.c~kexec-implementation-of-new-syscall-kexec_file_load-fix
+++ a/kernel/kexec.c
@@ -331,7 +331,7 @@ out_free_image:
static int copy_file_from_fd(int fd, void **buf, unsigned long *buf_len)
{
struct fd f = fdget(fd);
- int ret = 0;
+ int ret;
struct kstat stat;
loff_t pos;
ssize_t bytes = 0;
@@ -375,6 +375,12 @@ static int copy_file_from_fd(int fd, voi
pos += bytes;
}
+ if (pos != stat.size) {
+ ret = -EBADF;
+ vfree(*buf);
+ goto out;
+ }
+
*buf_len = pos;
out:
fdput(f);
_
Patches currently in -mm which might be from vgoyal@xxxxxxxxxx are
bin2c-move-bin2c-in-scripts-basic.patch
kernel-build-bin2c-based-on-config-option-config_build_bin2c.patch
kexec-rename-unusebale_pages-to-unusable_pages.patch
kexec-move-segment-verification-code-in-a-separate-function.patch
kexec-use-common-function-for-kimage_normal_alloc-and-kimage_crash_alloc.patch
resource-provide-new-functions-to-walk-through-resources.patch
kexec-make-kexec_segment-user-buffer-pointer-a-union.patch
kexec-new-syscall-kexec_file_load-declaration.patch
kexec-implementation-of-new-syscall-kexec_file_load.patch
kexec-implementation-of-new-syscall-kexec_file_load-checkpatch-fixes.patch
kexec-implementation-of-new-syscall-kexec_file_load-fix.patch
purgatory-sha256-provide-implementation-of-sha256-in-purgaotory-context.patch
purgatory-core-purgatory-functionality.patch
kexec-load-and-relocate-purgatory-at-kernel-load-time.patch
kexec-bzimage64-support-for-loading-bzimage-using-64bit-entry.patch
kexec-bzimage64-support-for-loading-bzimage-using-64bit-entry-fix.patch
kexec-support-for-kexec-on-panic-using-new-system-call.patch
kexec-support-for-kexec-on-panic-using-new-system-call-fix.patch
kexec-support-kexec-kdump-on-efi-systems.patch
kexec-support-kexec-kdump-on-efi-systems-fix.patch
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