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x86/sgx: Add overflow check in sgx_validate_offset_length()

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sgx_validate_offset_length() function verifies "offset" and "length"
arguments provided by userspace, but was missing an overflow check on
their addition. Add it.

Fixes: c6d26d3707 ("x86/sgx: Add SGX_IOC_ENCLAVE_ADD_PAGES")
Signed-off-by: Borys Popławski <borysp@invisiblethingslab.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Cc: stable@vger.kernel.org # v5.11+
Link: https://lore.kernel.org/r/0d91ac79-6d84-abed-5821-4dbe59fa1a38@invisiblethingslab.com
This commit is contained in:
Borys Popławski
2022-10-05 00:59:03 +02:00
committed by Borislav Petkov
parent f0c4d9fc9c
commit f0861f49bd
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kernel/cpu/sgx/ioctl.c
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@@ -356,6 +356,9 @@ static int sgx_validate_offset_length(struct sgx_encl *encl,
if (!length || !IS_ALIGNED(length, PAGE_SIZE))
return -EINVAL;
if (offset + length < offset)
return -EINVAL;
if (offset + length - PAGE_SIZE >= encl->size)
return -EINVAL;