boringssl

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Tag: Branch: Tree: 0bfc9b32c4

Commit Graph

Author	SHA1	Message	Date
David Benjamin	4f1fae3043	Fix the easy -Wformat-signedness errors. GCC has a warning that complains about even more type mismatches in printf. Some of these are a bit messy and will be fixed in separate CLs. This covers the easy ones. The .*s stuff is unfortunate, but printf has no size_t-clean string printer. ALPN protocol lengths are bound by uint8_t, so it doesn't really matter. The IPv6 printing one is obnoxious and arguably a false positive. It's really a C language flaw: all types smaller than int get converted to int when you do arithmetic. So something like this first doesn't overflow the shift because it computes over int, but then the result overall is stored as an int. uint8_t a, b; (a << 8) \| b On the one hand, this fixes a "missing" cast to uint16_t before the shift. At the same time, the incorrect final type means passing it to %x, which expects unsigned int. The compiler has forgotten this value actually fits in uint16_t and flags a warning. Mitigate this by storing in a uint16_t first. The story doesn't quite end here. Arguments passed to variadic functions go through integer promotion[0], so the argument is still passed to snprintf as an int! But then va_arg allows for a signedness mismatch[1], provided the value is representable in both types. The combination means that %x, though actually paired with unsigned, also accept uint8_t and uint16_t, because those are guaranteed to promote to an int that meets [1]. GCC recognizes [1] applies here. (There's also PRI16x, but that's a bit tedious to use and, in glibc, is defined as plain "x" anyway.) [0] https://en.cppreference.com/w/c/language/conversion#Default_argument_promotions [1] https://en.cppreference.com/w/c/variadic/va_arg Bug: 450 Change-Id: Ic1d41356755a18ab922956dd2e07b560470341f4 Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/50765 Reviewed-by: Adam Langley <agl@google.com> Commit-Queue: Adam Langley <agl@google.com>	3 years ago
Adam Langley	fb0c05cac2	acvp: add CMAC-AES support. Change by Dan Janni. Change-Id: I3f059e7b1a822c6f97128ca92a693499a3f7fa8f Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/41984 Commit-Queue: Adam Langley <agl@google.com> Reviewed-by: David Benjamin <davidben@google.com>	5 years ago

Author

SHA1

Message

Date

David Benjamin

4f1fae3043

Fix the easy -Wformat-signedness errors.

GCC has a warning that complains about even more type mismatches in
printf. Some of these are a bit messy and will be fixed in separate CLs.
This covers the easy ones.

The .*s stuff is unfortunate, but printf has no size_t-clean string
printer. ALPN protocol lengths are bound by uint8_t, so it doesn't
really matter.

The IPv6 printing one is obnoxious and arguably a false positive. It's
really a C language flaw: all types smaller than int get converted to
int when you do arithmetic. So something like this first doesn't
overflow the shift because it computes over int, but then the result
overall is stored as an int.

  uint8_t a, b;
  (a << 8) | b

On the one hand, this fixes a "missing" cast to uint16_t before the
shift. At the same time, the incorrect final type means passing it to
%x, which expects unsigned int. The compiler has forgotten this value
actually fits in uint16_t and flags a warning. Mitigate this by storing
in a uint16_t first.

The story doesn't quite end here. Arguments passed to variadic functions
go through integer promotion[0], so the argument is still passed to
snprintf as an int! But then va_arg allows for a signedness mismatch[1],
provided the value is representable in both types. The combination means
that %x, though actually paired with unsigned, also accept uint8_t and
uint16_t, because those are guaranteed to promote to an int that meets
[1]. GCC recognizes [1] applies here.

(There's also PRI16x, but that's a bit tedious to use and, in glibc, is
defined as plain "x" anyway.)

[0] https://en.cppreference.com/w/c/language/conversion#Default_argument_promotions
[1] https://en.cppreference.com/w/c/variadic/va_arg

Bug: 450
Change-Id: Ic1d41356755a18ab922956dd2e07b560470341f4
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/50765
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>

3 years ago

Adam Langley

fb0c05cac2

acvp: add CMAC-AES support.

Change by Dan Janni.

Change-Id: I3f059e7b1a822c6f97128ca92a693499a3f7fa8f
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/41984
Commit-Queue: Adam Langley <agl@google.com>
Reviewed-by: David Benjamin <davidben@google.com>

5 years ago

2 Commits (0bfc9b32c4ec860dc46338d15320532c5e4496c8)