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fix: fix uint64->uint32 underflow issues resulting from using cosmoss…
…dk.io/math This fixes potential security issues resulting from extraneous parsing that used cosmossdk.math.ParseUint which uses math/big.Int which is a big integer package and can allow uint64 in places where uint32 is used and there were underflow checks. The fix for this change was to simply use strconv.ParseUint(s, 10, BIT_SIZE) where BIT_SIZE is any of 32 or 64 bits for uint32 and uint64 respectively, and by extracting the shared code to an internal package. Fixes PeggyJV#292
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Original file line number | Diff line number | Diff line change |
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module github.com/peggyjv/sommelier/internal | ||
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go 1.19 |
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Original file line number | Diff line number | Diff line change |
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package internal | ||
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import ( | ||
"fmt" | ||
"strconv" | ||
) | ||
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// ParseUint64 parses s as a decimal uint64 value. | ||
func ParseUint64(s string) (uint64, error) { | ||
return strconv.ParseUint(s, 10, 64) | ||
} | ||
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// ParseUint32 parses s as a decimal uint32 value. | ||
func ParseUint32(s string) (uint32, error) { | ||
// In response to https://github.com/PeggyJV/sommelier/issues/292 | ||
// let's use strconv.ParseUint to properly catch range errors and | ||
// avoid underflows. | ||
u, err := strconv.ParseUint(s, 10, 32) | ||
if err != nil { | ||
return 0, err | ||
} | ||
// Bullet-proof check to ensure no underflows (even though we already have range checks) | ||
u32 := uint32(u) | ||
if g := uint64(u32); g != u { | ||
return 0, fmt.Errorf("parseuint32 underflow detected: got %d, want %d", g, u) | ||
} | ||
return u32, nil | ||
} |
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