Gilles Peskine da0913ba6b Call setbuf when reading or writing files: library ...

After opening a file containing sensitive data, call mbedtls_setbuf() to
disable buffering. This way, we don't expose sensitive data to a memory
disclosure vulnerability in a buffer outside our control.

This commit adds a call to mbedtls_setbuf() after each call to fopen(),
except:
* In ctr_drbg.c, in load_file(), because this is only used for DH parameters
  and they are not confidential data.
* In psa_its_file.c, in psa_its_remove(), because the file is only opened
  to check its existence, we don't read data from it.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>

2022-06-30 17:03:40 +02:00

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