mbedtls/ChangeLog.d/muladdc-amd64-memory.txt

Bugfix
   * Fix missing constraints on x86_64 assembly code for bignum multiplication
     that broke some bignum operations with (at least) Clang 12.
     Fixes #4116, #4786, #4917.
x86_64 MULADDC assembly: add missing constraints about memory MULADDC_CORE reads from (%%rsi) and writes to (%%rdi). This fragment is repeated up to 16 times, and %%rsi and %%rdi are s and d on entry respectively. Hence the complete asm statement reads 16 64-bit words from memory starting at s, and writes 16 64-bit words starting at d. Without any declaration of modified memory, Clang 12 and Clang 13 generated non-working code for mbedtls_mpi_mod_exp. The constraints make the unit tests pass with Clang 12. Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com> 2021-09-14 00:13:05 +02:00			`Bugfix`
			`* Fix missing constraints on x86_64 assembly code for bignum multiplication`
Update the list of issues fixed This had actually been reported multiple times. Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com> 2021-09-15 17:04:31 +02:00			`that broke some bignum operations with (at least) Clang 12.`
			`Fixes #4116, #4786, #4917.`