-
Notifications
You must be signed in to change notification settings - Fork 4
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
go: backport patch fix for CVE-2021-38297
Source: poky MR: 118243 Type: Integration Disposition: Merged from poky ChangeID: 048094bcf91ba71f875fff7a8c725f998d2e3f28 Description: Patch taken from golang/go@4548fcc from the following issue golang/go#48797 Original repo https://go.googlesource.com/go/+/77f2750f4398990eed972186706f160631d7dae4 (From OE-Core rev: e9e3c3969544d18f0da90a10156c40da84d5b549) Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com> Signed-off-by: Steve Sakoman <steve@sakoman.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org> Signed-off-by: Jeremy A. Puhlman <jpuhlman@mvista.com>
- Loading branch information
Showing
2 changed files
with
99 additions
and
0 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,97 @@ | ||
From 4548fcc8dfd933c237f29bba6f90040a85922564 Mon Sep 17 00:00:00 2001 | ||
From: Michael Knyszek <mknyszek@google.com> | ||
Date: Thu, 2 Sep 2021 16:51:59 -0400 | ||
Subject: [PATCH] [release-branch.go1.16] misc/wasm, cmd/link: do not let | ||
command line args overwrite global data | ||
|
||
On Wasm, wasm_exec.js puts command line arguments at the beginning | ||
of the linear memory (following the "zero page"). Currently there | ||
is no limit for this, and a very long command line can overwrite | ||
the program's data section. Prevent this by limiting the command | ||
line to 4096 bytes, and in the linker ensuring the data section | ||
starts at a high enough address (8192). | ||
|
||
(Arguably our address assignment on Wasm is a bit confusing. This | ||
is the minimum fix I can come up with.) | ||
|
||
Thanks to Ben Lubar for reporting this issue. | ||
|
||
Change by Cherry Mui <cherryyz@google.com>. | ||
|
||
For #48797 | ||
Fixes #48799 | ||
Fixes CVE-2021-38297 | ||
|
||
Change-Id: I0f50fbb2a5b6d0d047e3c134a88988d9133e4ab3 | ||
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/1205933 | ||
Reviewed-by: Roland Shoemaker <bracewell@google.com> | ||
Reviewed-by: Than McIntosh <thanm@google.com> | ||
Reviewed-on: https://go-review.googlesource.com/c/go/+/354591 | ||
Trust: Michael Knyszek <mknyszek@google.com> | ||
Reviewed-by: Heschi Kreinick <heschi@google.com> | ||
|
||
CVE: CVE-2021-38297 | ||
|
||
Upstream-Status: Backport: | ||
https://github.com/golang/go/commit/4548fcc8dfd933c237f29bba6f90040a85922564 | ||
|
||
Inline of ctxt.isWAsm followin this implemetation: | ||
https://github.com/golang/go/blob/4548fcc8dfd933c237f29bba6f90040a85922564/src/cmd/link/internal/ld/target.go#L127 | ||
|
||
Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com> | ||
--- | ||
misc/wasm/wasm_exec.js | 7 +++++++ | ||
src/cmd/link/internal/ld/data.go | 11 ++++++++++- | ||
2 files changed, 17 insertions(+), 1 deletion(-) | ||
|
||
diff --git a/misc/wasm/wasm_exec.js b/misc/wasm/wasm_exec.js | ||
index 82041e6bb901..a0a264278b1b 100644 | ||
--- a/misc/wasm/wasm_exec.js | ||
+++ b/misc/wasm/wasm_exec.js | ||
@@ -564,6 +564,13 @@ | ||
offset += 8; | ||
}); | ||
|
||
+ // The linker guarantees global data starts from at least wasmMinDataAddr. | ||
+ // Keep in sync with cmd/link/internal/ld/data.go:wasmMinDataAddr. | ||
+ const wasmMinDataAddr = 4096 + 4096; | ||
+ if (offset >= wasmMinDataAddr) { | ||
+ throw new Error("command line too long"); | ||
+ } | ||
+ | ||
this._inst.exports.run(argc, argv); | ||
if (this.exited) { | ||
this._resolveExitPromise(); | ||
diff --git a/src/cmd/link/internal/ld/data.go b/src/cmd/link/internal/ld/data.go | ||
index 52035e96301c..54a1d188cdb9 100644 | ||
--- a/src/cmd/link/internal/ld/data.go | ||
+++ b/src/cmd/link/internal/ld/data.go | ||
@@ -2330,6 +2330,11 @@ func assignAddress(ctxt *Link, sect *sym.Section, n int, s loader.Sym, va uint64 | ||
return sect, n, va | ||
} | ||
|
||
+// On Wasm, we reserve 4096 bytes for zero page, then 4096 bytes for wasm_exec.js | ||
+// to store command line args. Data sections starts from at least address 8192. | ||
+// Keep in sync with wasm_exec.js. | ||
+const wasmMinDataAddr = 4096 + 4096 | ||
+ | ||
// address assigns virtual addresses to all segments and sections and | ||
// returns all segments in file order. | ||
func (ctxt *Link) address() []*sym.Segment { | ||
@@ -2339,10 +2344,14 @@ func (ctxt *Link) address() []*sym.Segment { | ||
order = append(order, &Segtext) | ||
Segtext.Rwx = 05 | ||
Segtext.Vaddr = va | ||
- for _, s := range Segtext.Sections { | ||
+ for i, s := range Segtext.Sections { | ||
va = uint64(Rnd(int64(va), int64(s.Align))) | ||
s.Vaddr = va | ||
va += s.Length | ||
+ | ||
+ if ctxt.Arch.Family == sys.Wasm && i == 0 && va < wasmMinDataAddr { | ||
+ va = wasmMinDataAddr | ||
+ } | ||
} | ||
|
||
Segtext.Length = va - uint64(*FlagTextAddr) | ||
|