77f2750f43
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. Fixes #48797 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/+/354571 Reviewed-by: Cherry Mui <cherryyz@google.com> Reviewed-by: Heschi Kreinick <heschi@google.com> Trust: Michael Knyszek <mknyszek@google.com> Run-TryBot: Michael Knyszek <mknyszek@google.com> TryBot-Result: Go Bot <gobot@golang.org> |
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