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kernel: kexec: copy user-array safely
[ Upstream commit 569c8d82f9
]
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>
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1 changed files with 1 additions and 1 deletions
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@ -242,7 +242,7 @@ SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments,
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((flags & KEXEC_ARCH_MASK) != KEXEC_ARCH_DEFAULT))
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((flags & KEXEC_ARCH_MASK) != KEXEC_ARCH_DEFAULT))
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return -EINVAL;
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return -EINVAL;
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ksegments = memdup_user(segments, nr_segments * sizeof(ksegments[0]));
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ksegments = memdup_array_user(segments, nr_segments, sizeof(ksegments[0]));
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if (IS_ERR(ksegments))
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if (IS_ERR(ksegments))
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return PTR_ERR(ksegments);
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return PTR_ERR(ksegments);
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