teec: do fail on MAX_SIZE allocation requests #372
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libteec/src/tee_client_api.c
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| @@ -82,7 +82,8 @@ static void *teec_paged_aligned_alloc(size_t sz) | |||
| size_t page_sz = sysconf(_SC_PAGESIZE); | |||
| size_t aligned_sz = ((sz + page_sz - 1) / page_sz) * page_sz; | |||
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| if (!posix_memalign(&p, page_sz, aligned_sz)) | |||
| /* aligned_sz will be null if MAX_SIZE was requested */ | |||
| if (aligned_sz && !posix_memalign(&p, page_sz, aligned_sz)) | |||
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How about doing a classic overflow check like:
aligned_sz >= sz && ...to make it more obvious.
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ok. I will then remove the comment .
This should work just because TEEC_RegisterSharedMemory checks for size 0 and requests 8 bytes instead btw. Otherwise we would be calling the kernel unnecessarily since the aligned_size would be 0. maybe something to remember.
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tags added and versal retested |
The variable aligned_sz will be 0 when the requested sz is MAX_SIZE. Since posix_memalign can return a valid pointer for zero size allocations, share memory registration requests for MAX_SIZE might make it to the kernel. This PR stops it early - just as it was before "teec: use multiple of page size for page aligned buffers" was merged. Fixes: acb0885 ("teec: use multiple of page size for page aligned buffers") Signed-off-by: Jorge Ramirez-Ortiz <[email protected]> Reviewed-by: Jens Wiklander <[email protected]>
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had to fix the broken reference to the "Fixes" commit. all good now. |
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The variable aligned_sz will be 0 when the requested sz is MAX_SIZE. Since posix_memalign can return a valid pointer for zero size allocations, share memory registration requests for MAX_SIZE might make it to the kernel.
This PR stops it early - just as it was before "teec: use multiple of page size for page aligned buffers" was merged.
Fixes: acb0885 ("teec: use multiple of page size for page aligned buffers")