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6ad09f55e02f5f3c20c164b3a62b2e2b0e03cccd
Commit Graph

731 Commits

Author SHA1 Message Date
Leah Rowe 6ad09f55e0 util/nvmutil: restrict pointers in io_args 
Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-26 06:59:41 +00:00
Leah Rowe 8e555f444c util/nvmutil: check gbe file type before write 
Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-26 06:59:41 +00:00
Leah Rowe 47936f52e9 util/nvmutil: check gbe file size before write 
re-check. very unlikely since the program doesn't run
for very long, but we have to check if the file has
changed. this is a basic check of file size.

we could probably check the contents too, but that
would be overkill.

Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-26 06:59:41 +00:00
Leah Rowe 551470cf6f util/nvmutil: lock gbe file 
Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-26 06:59:41 +00:00
Leah Rowe afcdae1350 util/nvmutil: don't allow symlinks 
Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-26 06:59:41 +00:00
Leah Rowe 98466398f9 nvmutil: fix bound check in last commit 
i was fixing the size, but it should be calculated
properly.

Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-26 06:59:41 +00:00
Leah Rowe e44b297db5 util/nvmutul: remove unused arg in io_args 
Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-26 06:59:41 +00:00
Leah Rowe 83f67bf02a util/nvmutil: block bad offset in io_args 
Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-26 06:59:41 +00:00
Leah Rowe 14ab4c1b25 util/nvmutil: stricter i/o arg checks 
Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-26 06:59:41 +00:00
Leah Rowe 386f715a29 util/nvmutil: stricter i/o length check 
Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-26 06:59:41 +00:00
Leah Rowe d8be79432c util/nvmutil: rename len to nrw in i/o 
consistent with prw()

i prefer nrw (number of rw operations)

Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-26 06:59:41 +00:00
Leah Rowe 5ece694e67 util/nvmutil: tidy up prw() 
Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-26 06:59:41 +00:00
Leah Rowe 3e08c0724b util/nvmutil: block O_APPEND in prw() 
O_APPEND allows writes at EOF, thus breaking
positional read/write

Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-26 06:59:41 +00:00
Leah Rowe 7836a2bbc6 util/nvmutil: stricter i/o errors 
Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-26 06:59:41 +00:00
Leah Rowe 0c9bcaaba8 util/nvmutil: fix entropy issue 
the time difference used here could go negative, which
would overflow in the xor op on mix, leading to a biased
entropy pool. we want to ensure that they numbers do
not overflow, because here they are cast to unsigned
which would then produce very large numbers.

Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-26 06:59:41 +00:00
Leah Rowe 475c50932e nvmutil: cast integer in printf 
Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-26 06:59:41 +00:00
Leah Rowe 6f26bd5db7 TODO 
Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-26 06:59:41 +00:00
Leah Rowe 1abc40997f util/nvmutil: check defines/enum via assert 
not at runtime

Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-26 06:59:41 +00:00
Leah Rowe 435b67327e util/nvmutil: r_type check in rw_gbe_file_part 
i already send the right arg anyway. this is a
preventative bug fix against future maintenance.

Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-26 06:59:41 +00:00
Leah Rowe 54536b0454 util/nvmutil: remove pointless check 
already checked below, then err()

Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-26 06:59:41 +00:00
Leah Rowe f99921d717 util/nvmutil: add missing cast 
Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-26 06:59:41 +00:00
Leah Rowe ddf13a7e74 util/nvmutil: err in rw_file_exact on zero return 
zero never occurs, because rw_file_once never returns zero,
but only rw_file_once determines that. rw_file_exact must
handle every possible error.

right now, if that call returns zero, rw_file_exact would
have an infinite loop.

this doesn't actually happen at the moment, so this is a
preventative bug fix.

Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-26 06:59:41 +00:00
Leah Rowe a0ca693d42 util/nvmutil: increment rc at end of rw_file_exact 
for fussy static analysers and/or compilers

Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-26 06:59:41 +00:00
Leah Rowe 1dbd679c0c util/nvmutil: further tidy up prw() 
Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-26 06:59:41 +00:00
Leah Rowe e239a3107f util/nvmutil: clean up i/o functions 
properly verify the value of the arguments, with
asserts.

add simpler runtime checks in-function, on prw,
rw_file_once and rw_file_exact.

variable names in english now, and the code is
cleaner, while being functionally equivalent.

Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-26 06:59:41 +00:00
Leah Rowe 347e39bab7 util/nvmutil: further tidy up rw_file_once 
Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-26 06:59:41 +00:00
Leah Rowe b4154dd29b util/nvmutil: minor cleanup: rw_file_once 
Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-26 06:59:41 +00:00
Leah Rowe a85f2898e2 util/nvmutil: remove dead code 
useless check. will never be true.

Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-26 06:59:41 +00:00
Leah Rowe fdd99a9a45 util/nvmutil: remove pointless comment 
itt's totally obvious

Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-26 06:59:41 +00:00
Leah Rowe 5f6a721fa0 util/nvmutil: reduced indentation in rw_file_once 
Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-26 06:59:41 +00:00
Leah Rowe 22af92b473 another correction 
Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-12 18:25:34 +00:00
Leah Rowe 5b92b00bad util/nvmutil: fix regression on openbsd 
when i removed arc4random integration, i forgot
to change this line back. oops!

Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-12 18:23:17 +00:00
Leah Rowe 1cce4871e2 TODO 
Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-12 17:55:54 +00:00
Leah Rowe cde28a8fbb TODO 
Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-12 17:52:05 +00:00
Leah Rowe 08b9595bc5 TODO 
Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-12 17:31:25 +00:00
Leah Rowe ab9ee73350 util/nvmutil: mitigate buggy libc i/o 
Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-12 16:34:33 +00:00
Leah Rowe 303c382eae util/nvmutil: implement zero-byte r/w timeout 
Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-12 16:24:36 +00:00
Leah Rowe 9656e78c3a TODO 
Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-12 16:16:09 +00:00
Leah Rowe 571c474866 util/nvmutil: add some useful comments 
Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-12 16:10:28 +00:00
Leah Rowe 1fb720e1e6 util/nvmutil: split up rw_file_exact 
Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-12 16:03:17 +00:00
Leah Rowe 48f124a2e8 fix indentation 
i was editting this in another editor

Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-12 15:34:10 +00:00
Leah Rowe f04b796dcc util/nvmutil: add jitter to fallback_rand entropy 
Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-12 14:36:01 +00:00
Leah Rowe 38c3889f67 util/nvmutil: improved entropy in fallback_rand 
Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-12 14:32:46 +00:00
Leah Rowe 1cee54ee2b util/nvmutil: remove /dev/random fallback 
only use the old fallback, or /dev/urandom

/dev/random blocks on some older unix machines,
or in embedded environments that may never
have enough entropy, causing the code to hang.

urandom is most certainly expected to exist on
pretty much anything since the mid 90s.

i could probably re-add the arc4random setup
for BSDs. i'll think about it. gotta do that
portably too.

Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-12 14:26:54 +00:00
Leah Rowe 1ad9ffb482 util/nvmutil: include time.h after types.h 
Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-12 14:16:11 +00:00
Leah Rowe 922344e81e util/nvmutil: mitigate fast calls to rand 
if someone calls rhex fast enough, the timestamp
may not change. this mitigates that by adding
a counter value to the mix

Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-12 14:13:55 +00:00
Leah Rowe 53c5a40007 util/nvmutil: fallback randomiser 
used when a random device isn't available, on old
unix, or on certain chroot environments.

Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-12 14:10:29 +00:00
Leah Rowe 5ba0b98fbc util/nvmutil: correct install usage 
one for directory, then copy the binary

Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-12 14:01:24 +00:00
Leah Rowe 35ba3aef91 util/nvmutil: fix makefile 
forgot to include the binary in the path

Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-12 13:56:47 +00:00
Leah Rowe af1a219e40 util/nvmutil: remove errno extern 
may break modern systems. and all old systems that
i care about will handle errno just fine.

Signed-off-by: Leah Rowe <leah@libreboot.org>
 2026-03-12 13:54:04 +00:00