@@ -18,6 +18,7 @@ SRC_URI += "\
file://0001-src-cmd-dist-buildgo.go-do-not-hardcode-host-compile.patch \
file://CVE-2022-27664.patch \
file://0001-net-http-httputil-avoid-query-parameter-smuggling.patch \
+ file://CVE-2022-41715.patch \
"
SRC_URI[main.sha256sum] = "a1a48b23afb206f95e7bbaa9b898d965f90826f6f1d1fc0c1d784ada0cd300fd"
new file mode 100644
@@ -0,0 +1,270 @@
+From e9017c2416ad0ef642f5e0c2eab2dbf3cba4d997 Mon Sep 17 00:00:00 2001
+From: Russ Cox <rsc@golang.org>
+Date: Wed, 28 Sep 2022 11:18:51 -0400
+Subject: [PATCH] [release-branch.go1.18] regexp: limit size of parsed regexps
+
+Set a 128 MB limit on the amount of space used by []syntax.Inst
+in the compiled form corresponding to a given regexp.
+
+Also set a 128 MB limit on the rune storage in the *syntax.Regexp
+tree itself.
+
+Thanks to Adam Korczynski (ADA Logics) and OSS-Fuzz for reporting this issue.
+
+Fixes CVE-2022-41715.
+Updates #55949.
+Fixes #55950.
+
+Change-Id: Ia656baed81564436368cf950e1c5409752f28e1b
+Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/1592136
+TryBot-Result: Security TryBots <security-trybots@go-security-trybots.iam.gserviceaccount.com>
+Reviewed-by: Damien Neil <dneil@google.com>
+Run-TryBot: Roland Shoemaker <bracewell@google.com>
+Reviewed-by: Julie Qiu <julieqiu@google.com>
+Reviewed-on: https://go-review.googlesource.com/c/go/+/438501
+Run-TryBot: Carlos Amedee <carlos@golang.org>
+Reviewed-by: Carlos Amedee <carlos@golang.org>
+Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
+TryBot-Result: Gopher Robot <gobot@golang.org>
+Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
+
+Upstream-Status: Backport [https://github.com/golang/go/commit/e9017c2416ad0ef642f5e0c2eab2dbf3cba4d997]
+CVE: CVE-2022-41715
+Signed-off-by: Hitendra Prajapati <hprajapati@mvista.com>
+---
+ src/regexp/syntax/parse.go | 145 ++++++++++++++++++++++++++++++--
+ src/regexp/syntax/parse_test.go | 13 +--
+ 2 files changed, 148 insertions(+), 10 deletions(-)
+
+diff --git a/src/regexp/syntax/parse.go b/src/regexp/syntax/parse.go
+index d7cf2af..3792960 100644
+--- a/src/regexp/syntax/parse.go
++++ b/src/regexp/syntax/parse.go
+@@ -90,15 +90,49 @@ const (
+ // until we've allocated at least maxHeight Regexp structures.
+ const maxHeight = 1000
+
++// maxSize is the maximum size of a compiled regexp in Insts.
++// It too is somewhat arbitrarily chosen, but the idea is to be large enough
++// to allow significant regexps while at the same time small enough that
++// the compiled form will not take up too much memory.
++// 128 MB is enough for a 3.3 million Inst structures, which roughly
++// corresponds to a 3.3 MB regexp.
++const (
++ maxSize = 128 << 20 / instSize
++ instSize = 5 * 8 // byte, 2 uint32, slice is 5 64-bit words
++)
++
++// maxRunes is the maximum number of runes allowed in a regexp tree
++// counting the runes in all the nodes.
++// Ignoring character classes p.numRunes is always less than the length of the regexp.
++// Character classes can make it much larger: each \pL adds 1292 runes.
++// 128 MB is enough for 32M runes, which is over 26k \pL instances.
++// Note that repetitions do not make copies of the rune slices,
++// so \pL{1000} is only one rune slice, not 1000.
++// We could keep a cache of character classes we've seen,
++// so that all the \pL we see use the same rune list,
++// but that doesn't remove the problem entirely:
++// consider something like [\pL01234][\pL01235][\pL01236]...[\pL^&*()].
++// And because the Rune slice is exposed directly in the Regexp,
++// there is not an opportunity to change the representation to allow
++// partial sharing between different character classes.
++// So the limit is the best we can do.
++const (
++ maxRunes = 128 << 20 / runeSize
++ runeSize = 4 // rune is int32
++)
++
+ type parser struct {
+ flags Flags // parse mode flags
+ stack []*Regexp // stack of parsed expressions
+ free *Regexp
+ numCap int // number of capturing groups seen
+ wholeRegexp string
+- tmpClass []rune // temporary char class work space
+- numRegexp int // number of regexps allocated
+- height map[*Regexp]int // regexp height for height limit check
++ tmpClass []rune // temporary char class work space
++ numRegexp int // number of regexps allocated
++ numRunes int // number of runes in char classes
++ repeats int64 // product of all repetitions seen
++ height map[*Regexp]int // regexp height, for height limit check
++ size map[*Regexp]int64 // regexp compiled size, for size limit check
+ }
+
+ func (p *parser) newRegexp(op Op) *Regexp {
+@@ -122,6 +156,104 @@ func (p *parser) reuse(re *Regexp) {
+ p.free = re
+ }
+
++func (p *parser) checkLimits(re *Regexp) {
++ if p.numRunes > maxRunes {
++ panic(ErrInternalError)
++ }
++ p.checkSize(re)
++ p.checkHeight(re)
++}
++
++func (p *parser) checkSize(re *Regexp) {
++ if p.size == nil {
++ // We haven't started tracking size yet.
++ // Do a relatively cheap check to see if we need to start.
++ // Maintain the product of all the repeats we've seen
++ // and don't track if the total number of regexp nodes
++ // we've seen times the repeat product is in budget.
++ if p.repeats == 0 {
++ p.repeats = 1
++ }
++ if re.Op == OpRepeat {
++ n := re.Max
++ if n == -1 {
++ n = re.Min
++ }
++ if n <= 0 {
++ n = 1
++ }
++ if int64(n) > maxSize/p.repeats {
++ p.repeats = maxSize
++ } else {
++ p.repeats *= int64(n)
++ }
++ }
++ if int64(p.numRegexp) < maxSize/p.repeats {
++ return
++ }
++
++ // We need to start tracking size.
++ // Make the map and belatedly populate it
++ // with info about everything we've constructed so far.
++ p.size = make(map[*Regexp]int64)
++ for _, re := range p.stack {
++ p.checkSize(re)
++ }
++ }
++
++ if p.calcSize(re, true) > maxSize {
++ panic(ErrInternalError)
++ }
++}
++
++func (p *parser) calcSize(re *Regexp, force bool) int64 {
++ if !force {
++ if size, ok := p.size[re]; ok {
++ return size
++ }
++ }
++
++ var size int64
++ switch re.Op {
++ case OpLiteral:
++ size = int64(len(re.Rune))
++ case OpCapture, OpStar:
++ // star can be 1+ or 2+; assume 2 pessimistically
++ size = 2 + p.calcSize(re.Sub[0], false)
++ case OpPlus, OpQuest:
++ size = 1 + p.calcSize(re.Sub[0], false)
++ case OpConcat:
++ for _, sub := range re.Sub {
++ size += p.calcSize(sub, false)
++ }
++ case OpAlternate:
++ for _, sub := range re.Sub {
++ size += p.calcSize(sub, false)
++ }
++ if len(re.Sub) > 1 {
++ size += int64(len(re.Sub)) - 1
++ }
++ case OpRepeat:
++ sub := p.calcSize(re.Sub[0], false)
++ if re.Max == -1 {
++ if re.Min == 0 {
++ size = 2 + sub // x*
++ } else {
++ size = 1 + int64(re.Min)*sub // xxx+
++ }
++ break
++ }
++ // x{2,5} = xx(x(x(x)?)?)?
++ size = int64(re.Max)*sub + int64(re.Max-re.Min)
++ }
++
++ if size < 1 {
++ size = 1
++ }
++ p.size[re] = size
++ return size
++}
++
+ func (p *parser) checkHeight(re *Regexp) {
+ if p.numRegexp < maxHeight {
+ return
+@@ -158,6 +290,7 @@ func (p *parser) calcHeight(re *Regexp, force bool) int {
+
+ // push pushes the regexp re onto the parse stack and returns the regexp.
+ func (p *parser) push(re *Regexp) *Regexp {
++ p.numRunes += len(re.Rune)
+ if re.Op == OpCharClass && len(re.Rune) == 2 && re.Rune[0] == re.Rune[1] {
+ // Single rune.
+ if p.maybeConcat(re.Rune[0], p.flags&^FoldCase) {
+@@ -189,7 +322,7 @@ func (p *parser) push(re *Regexp) *Regexp {
+ }
+
+ p.stack = append(p.stack, re)
+- p.checkHeight(re)
++ p.checkLimits(re)
+ return re
+ }
+
+@@ -299,7 +432,7 @@ func (p *parser) repeat(op Op, min, max int, before, after, lastRepeat string) (
+ re.Sub = re.Sub0[:1]
+ re.Sub[0] = sub
+ p.stack[n-1] = re
+- p.checkHeight(re)
++ p.checkLimits(re)
+
+ if op == OpRepeat && (min >= 2 || max >= 2) && !repeatIsValid(re, 1000) {
+ return "", &Error{ErrInvalidRepeatSize, before[:len(before)-len(after)]}
+@@ -503,6 +636,7 @@ func (p *parser) factor(sub []*Regexp) []*Regexp {
+
+ for j := start; j < i; j++ {
+ sub[j] = p.removeLeadingString(sub[j], len(str))
++ p.checkLimits(sub[j])
+ }
+ suffix := p.collapse(sub[start:i], OpAlternate) // recurse
+
+@@ -560,6 +694,7 @@ func (p *parser) factor(sub []*Regexp) []*Regexp {
+ for j := start; j < i; j++ {
+ reuse := j != start // prefix came from sub[start]
+ sub[j] = p.removeLeadingRegexp(sub[j], reuse)
++ p.checkLimits(sub[j])
+ }
+ suffix := p.collapse(sub[start:i], OpAlternate) // recurse
+
+diff --git a/src/regexp/syntax/parse_test.go b/src/regexp/syntax/parse_test.go
+index 1ef6d8a..67e3c56 100644
+--- a/src/regexp/syntax/parse_test.go
++++ b/src/regexp/syntax/parse_test.go
+@@ -484,12 +484,15 @@ var invalidRegexps = []string{
+ `(?P<>a)`,
+ `[a-Z]`,
+ `(?i)[a-Z]`,
+- `a{100000}`,
+- `a{100000,}`,
+- "((((((((((x{2}){2}){2}){2}){2}){2}){2}){2}){2}){2})",
+- strings.Repeat("(", 1000) + strings.Repeat(")", 1000),
+- strings.Repeat("(?:", 1000) + strings.Repeat(")*", 1000),
+ `\Q\E*`,
++ `a{100000}`, // too much repetition
++ `a{100000,}`, // too much repetition
++ "((((((((((x{2}){2}){2}){2}){2}){2}){2}){2}){2}){2})", // too much repetition
++ strings.Repeat("(", 1000) + strings.Repeat(")", 1000), // too deep
++ strings.Repeat("(?:", 1000) + strings.Repeat(")*", 1000), // too deep
++ "(" + strings.Repeat("(xx?)", 1000) + "){1000}", // too long
++ strings.Repeat("(xx?){1000}", 1000), // too long
++ strings.Repeat(`\pL`, 27000), // too many runes
+ }
+
+ var onlyPerl = []string{
+--
+2.25.1
+