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AK+Everywhere: Don't crash on invalid months

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Sadly, we don't have proper error propagation here. However, crashing
the Kernel just because a CDROM contains an invalid month seems like a
bad idea.
This commit is contained in:
Ben Wiederhake 2023-05-24 22:19:17 +02:00 committed by Jelle Raaijmakers
parent 9d40ecacb5
commit 5fafd82927
Notes: sideshowbarker 2024-07-17 04:49:48 +09:00 
Author: https://github.com/BenWiederhake
Commit: https://github.com/SerenityOS/serenity/commit/5fafd82927
Pull-request: https://github.com/SerenityOS/serenity/pull/19029
Reviewed-by: https://github.com/gmta ✅
Reviewed-by: https://github.com/kleinesfilmroellchen ✅
3 changed files with 13 additions and 37 deletions
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5
AK/Time.h
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@ -54,7 +54,10 @@ unsigned day_of_week(int year, unsigned month, int day);
// can be negative.
constexpr int day_of_year(int year, unsigned month, int day)
{
VERIFY(month >= 1 && month <= 12);
if (is_constant_evaluated())
VERIFY(month >= 1 && month <= 12); // Note that this prevents bad constexpr months, but never actually prints anything.
else if (!(month >= 1 && month <= 12))
return 0;
constexpr Array seek_table = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
int day_of_year = seek_table[month - 1] + day - 1;

2
Kernel/FileSystem/ISO9660FS/Inode.cpp
View File

@ -194,8 +194,6 @@ UnixDateTime ISO9660Inode::parse_numerical_date_time(ISO::NumericalDateAndTime c
i32 year_offset = date.years_since_1900 - 70;
// FIXME: This ignores timezone information in date.
// FIXME: This calls `VERIFY(month >= 1 && month <= 12)` (but irritatingly allows days 0 and 255),
// which means we can crash the kernel by inserting a CD with an invalid recording month.
return UnixDateTime::from_unix_time_parts(year_offset, date.month, date.day, date.hour, date.minute, date.second, 0);
}

43
Tests/AK/TestDuration.cpp
View File

@ -347,9 +347,9 @@ TEST_CASE(days_since_epoch)
// At least shouldn't crash:
EXPECT_EQ(days_since_epoch(1971, 1, 0), 364);
// FIXME shouldn't crash: EXPECT_EQ(days_since_epoch(1971, 0, 1), 334);
// FIXME shouldn't crash: EXPECT_EQ(days_since_epoch(1971, 0, 0), 333);
// FIXME shouldn't crash: EXPECT_EQ(days_since_epoch(1971, 13, 3), ???);
EXPECT_EQ(days_since_epoch(1971, 0, 1), 365);
EXPECT_EQ(days_since_epoch(1971, 0, 0), 365);
EXPECT_EQ(days_since_epoch(1971, 13, 3), 365);
// I can't easily verify that these values are perfectly exact and correct, but they're close enough.
// Also, for these "years" the most important thing is to avoid crashing (i.e. signed overflow UB).
@ -564,27 +564,14 @@ TEST_CASE(from_unix_time_parts_common_values)
TEST_CASE(from_unix_time_parts_negative)
{
// Negative "common" values. These aren't really that well-defined, but we must make sure we don't crash.
// FIXME: We shouldn't VERIFY(), especially because this is used in the Kernel!
EXPECT_DURATION(UnixDateTime::from_unix_time_parts(1970, 1, 0, 23, 0, 0, 0).offset_to_epoch(), -3600, 0);
EXPECT_DURATION(UnixDateTime::from_unix_time_parts(1970, 1, 0, 24, 0, 0, 0).offset_to_epoch(), 0, 0);
// EXPECT_DURATION(UnixDateTime::from_unix_time_parts(1970, 0, 31, 0, 0, 0, 0).offset_to_epoch(), 0, 0);
EXPECT_CRASH("Month 0 currently not allowed", [] {
(void)UnixDateTime::from_unix_time_parts(1970, 0, 31, 0, 0, 0, 0);
return Test::Crash::Failure::DidNotCrash;
});
EXPECT_DURATION(UnixDateTime::from_unix_time_parts(1970, 0, 31, 0, 0, 0, 0).offset_to_epoch(), 0, 0);
EXPECT_DURATION(UnixDateTime::from_unix_time_parts(1970, 11, 30, 0, 0, 0, 0).offset_to_epoch(), 28771200, 0);
EXPECT_DURATION(UnixDateTime::from_unix_time_parts(1970, 12, 1, 0, 0, 0, 0).offset_to_epoch(), 28857600, 0);
EXPECT_DURATION(UnixDateTime::from_unix_time_parts(1970, 12, 31, 0, 0, 0, 0).offset_to_epoch(), 31449600, 0);
// EXPECT_DURATION(UnixDateTime::from_unix_time_parts(1971, 0, 0, 0, 0, 0, 0).offset_to_epoch(), 28857600, 0);
EXPECT_CRASH("Month 0 currently not allowed", [] {
(void)UnixDateTime::from_unix_time_parts(1971, 0, 0, 0, 0, 0, 0);
return Test::Crash::Failure::DidNotCrash;
});
// EXPECT_DURATION(UnixDateTime::from_unix_time_parts(1971, 0, 1, 0, 0, 0, 0).offset_to_epoch(), 28944000, 0);
EXPECT_CRASH("Month 0 currently not allowed", [] {
(void)UnixDateTime::from_unix_time_parts(1971, 0, 1, 0, 0, 0, 0);
return Test::Crash::Failure::DidNotCrash;
});
EXPECT_DURATION(UnixDateTime::from_unix_time_parts(1971, 0, 0, 0, 0, 0, 0).offset_to_epoch(), 31536000, 0);
EXPECT_DURATION(UnixDateTime::from_unix_time_parts(1971, 0, 1, 0, 0, 0, 0).offset_to_epoch(), 31536000, 0);
EXPECT_DURATION(UnixDateTime::from_unix_time_parts(1971, 1, 0, 0, 0, 0, 0).offset_to_epoch(), 31449600, 0);
EXPECT_DURATION(UnixDateTime::from_unix_time_parts(1971, 1, 1, 0, 0, 0, 0).offset_to_epoch(), 31536000, 0);
EXPECT_DURATION(UnixDateTime::from_unix_time_parts(1969, 1, 1, 0, 0, 0, 0).offset_to_epoch(), -31536000, 0);
@ -618,11 +605,7 @@ TEST_CASE(from_unix_time_parts_overflow)
EXPECT_DURATION(UnixDateTime::from_unix_time_parts(-1'000'000, 1, 1, 0, 0, 0, 0).offset_to_epoch(), -31619119219200, 0); // Guess: -31619119195440, off by the same 23760 seconds
EXPECT_DURATION(UnixDateTime::from_unix_time_parts(-2'147'483'648, 1, 1, 0, 0, 0, 0).offset_to_epoch(), -67768100567971200, 0); // Guess: -67768100567916336, off by 54864 seconds
EXPECT_DURATION(UnixDateTime::from_unix_time_parts(-2'147'483'648, 1, 0, 0, 0, 0, 0).offset_to_epoch(), -67768100568057600, 0); // Guess: -67768100568002736, off by the same 54864 seconds
// EXPECT_DURATION(UnixDateTime::from_unix_time_parts(-2'147'483'648, 0, 0, 0, 0, 0, 0).offset_to_epoch(), -67768100568006336, 0); // Guess: -67768100568006336
EXPECT_CRASH("Month 0 currently not allowed", [] {
(void)UnixDateTime::from_unix_time_parts(-2'147'483'648, 0, 0, 0, 0, 0, 0);
return Test::Crash::Failure::DidNotCrash;
});
EXPECT_DURATION(UnixDateTime::from_unix_time_parts(-2'147'483'648, 0, 0, 0, 0, 0, 0).offset_to_epoch(), -67768100567971200, 0);
// Positive overflow
EXPECT_DURATION(UnixDateTime::from_unix_time_parts(1970, 1, 1, 0, 0, 0, 65535).offset_to_epoch(), 65, 535'000'000);
@ -631,18 +614,10 @@ TEST_CASE(from_unix_time_parts_overflow)
EXPECT_DURATION(UnixDateTime::from_unix_time_parts(1970, 1, 1, 255, 0, 0, 0).offset_to_epoch(), 918000, 0);
EXPECT_DURATION(UnixDateTime::from_unix_time_parts(1970, 1, 255, 0, 0, 0, 0).offset_to_epoch(), 21945600, 0);
EXPECT_DURATION(UnixDateTime::from_unix_time_parts(1970, 12, 1, 0, 0, 0, 0).offset_to_epoch(), 28857600, 0);
// EXPECT_DURATION(UnixDateTime::from_unix_time_parts(1970, 255, 1, 0, 0, 0, 0).offset_to_epoch(), 670585230, 0);
EXPECT_CRASH("Month 255 currently crashes", [] {
(void)UnixDateTime::from_unix_time_parts(1970, 255, 1, 0, 0, 0, 0);
return Test::Crash::Failure::DidNotCrash;
});
EXPECT_DURATION(UnixDateTime::from_unix_time_parts(1970, 255, 1, 0, 0, 0, 0).offset_to_epoch(), 0, 0);
EXPECT_DURATION(UnixDateTime::from_unix_time_parts(1'000'000, 1, 1, 0, 0, 0, 0).offset_to_epoch(), 31494784780800, 0);
EXPECT_DURATION(UnixDateTime::from_unix_time_parts(2'147'483'647, 1, 1, 0, 0, 0, 0).offset_to_epoch(), 67767976201996800, 0);
EXPECT_DURATION(UnixDateTime::from_unix_time_parts(2'147'483'647, 12, 255, 0, 0, 0, 0).offset_to_epoch(), 67767976252800000, 0);
EXPECT_DURATION(UnixDateTime::from_unix_time_parts(2'147'483'647, 12, 255, 255, 255, 255, 65535).offset_to_epoch(), 67767976253733620, 535'000'000);
// EXPECT_DURATION(UnixDateTime::from_unix_time_parts(2'147'483'647, 255, 255, 255, 255, 255, 65535).offset_to_epoch(), ????, 535'000'000);
EXPECT_CRASH("Month 255 currently crashes", [] {
(void)UnixDateTime::from_unix_time_parts(2'147'483'647, 255, 255, 255, 255, 255, 65535);
return Test::Crash::Failure::DidNotCrash;
});
EXPECT_DURATION(UnixDateTime::from_unix_time_parts(2'147'483'647, 255, 255, 255, 255, 255, 65535).offset_to_epoch(), 67767976202930420, 535'000'000);
}