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kernel: kexec: copy user-array safely 

[ Upstream commit 569c8d82f95eb5993c84fb61a649a9c4ddd208b3 ]

Currently, there is no overflow-check with memdup_user().

Use the new function memdup_array_user() instead of memdup_user() for
duplicating the user-space array safely.

Suggested-by: David Airlie <airlied@redhat.com>
Signed-off-by: Philipp Stanner <pstanner@redhat.com>
Acked-by: Baoquan He <bhe@redhat.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Zack Rusin <zackr@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230920123612.16914-4-pstanner@redhat.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Philipp Stanner 2023-09-20 14:36:10 +02:00 committed by Greg Kroah-Hartman
parent 2fabc3289b
commit 8332523b13
1 changed files with 1 additions and 1 deletions
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kernel/kexec.c
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@ -240,7 +240,7 @@ SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments,
((flags & KEXEC_ARCH_MASK) != KEXEC_ARCH_DEFAULT)) ((flags & KEXEC_ARCH_MASK) != KEXEC_ARCH_DEFAULT))
return -EINVAL; return -EINVAL;
ksegments = memdup_user(segments, nr_segments * sizeof(ksegments[0])); ksegments = memdup_array_user(segments, nr_segments, sizeof(ksegments[0]));
if (IS_ERR(ksegments)) if (IS_ERR(ksegments))
return PTR_ERR(ksegments); return PTR_ERR(ksegments);