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Fix incorrect expansion of "" and "." when $PATH contains an executable
file or, on Windows, a parent directory of a %PATH% element contains an
file with the same name as the %PATH% element but with one of the
%PATHEXT% extension (ex: C:\utils\bin is in PATH, and C:\utils\bin.exe
exists).
Fix incorrect expansion of ".." when $PATH contains an element which is
an the concatenation of the path to an executable file (or on Windows
a path that can be expanded to an executable by appending a %PATHEXT%
extension), a path separator and a name.
"", "." and ".." are now rejected early with ErrNotFound.
Fixes CVE-2025-47906
Fixes #74466
Change-Id: Ie50cc0a660fce8fbdc952a7f2e05c36062dcb50e
Reviewed-on: https://go-review.googlesource.com/c/go/+/685755
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Damien Neil <dneil@google.com>
Reviewed-by: Roland Shoemaker <roland@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>
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Change-Id: I5bc514bedeb1155e6db52e37736fd6101774aea0
Reviewed-on: https://go-review.googlesource.com/c/go/+/529896
Auto-Submit: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Commit-Queue: Ian Lance Taylor <iant@golang.org>
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- Use the test binary itself for printing paths instead of building a
separate binary and running it through additional subprocesses.
- Factor out a common chdir helper.
- Use t.Setenv where appropriate.
- Reduce indirection in test helpers.
- Set NoDefaultCurrentDirectoryInExePath consistently in the
environment.
Also add a test case demonstrating an interesting behavior for
relative paths that may interact with #62596.
Fixes #62594.
For #62596.
Change-Id: I19b9325034edf78cd0ca747594476cd7432bb451
Reviewed-on: https://go-review.googlesource.com/c/go/+/528035
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Bryan Mills <bcmills@google.com>
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This cuts the wall duration for 'go test os/exec' and
'go test -race os/exec' roughly in half on my machine,
which is an even more significant speedup with a high '-count'.
For better or for worse, it may also increase the repro rate
of #34988.
Tests that use Setenv or Chdir or check for FDs opened during the test
still cannot be parallelized, but they are only a few of those.
Change-Id: I8d284d8bff05787853f825ef144aeb7a4126847f
Reviewed-on: https://go-review.googlesource.com/c/go/+/439196
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Auto-Submit: Bryan Mills <bcmills@google.com>
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Updates #52580.
For #50436.
Change-Id: I669f13863f1f85d576c3c94500b118e6989000eb
Reviewed-on: https://go-review.googlesource.com/c/go/+/436655
Auto-Submit: Bryan Mills <bcmills@google.com>
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The changes are likely to break users, and we need
to make it easy to unbreak without code changes.
For #43724.
Fixes #53962.
Change-Id: I105c5d6c801d354467e0cefd268189c18846858e
Reviewed-on: https://go-review.googlesource.com/c/go/+/419794
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
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Run-TryBot: Russ Cox <rsc@golang.org>
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explicit one
If the current directory is also listed explicitly in %PATH%,
this changes the behavior of LookPath to prefer the explicit name for it
(and thereby avoid ErrDot).
However, in order to avoid running a different executable from what
would have been run by previous Go versions, we still return the
implicit path (and ErrDot) if it refers to a different file entirely.
Fixes #53536.
Updates #43724.
Change-Id: I7ab01074e21a0e8b07a176e3bc6d3b8cf0c873cd
Reviewed-on: https://go-review.googlesource.com/c/go/+/414054
Reviewed-by: Russ Cox <rsc@golang.org>
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
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CL 381374 was reverted because x/sys/execabs broke.
This CL reapplies CL 381374, but adding a lookPathErr error
field back, for execabs to manipulate with reflect.
That field will just be a bit of scar tissue in this package forever,
to keep old code working with new toolchains.
CL 403256 fixes x/sys/execabs's test to be ready for the change.
Older versions of x/sys/execabs will keep working
(that is, will keep rejecting what they should reject),
but they will return a slightly different error from LookPath
without that CL, and the test fails because of the different
error text.
For #43724.
This reverts commit f2b674756b3b684118e4245627d4ed8c07e518e7.
Change-Id: Iee55f8cd9939e1bd31e5cbdada50681cdc505117
Reviewed-on: https://go-review.googlesource.com/c/go/+/403274
Auto-Submit: Russ Cox <rsc@golang.org>
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This reverts CL 381374.
Reason for revert: broke tests for x/sys/execabs.
Updates #43724.
Updates #43947.
Change-Id: I9eb3adb5728dead66dbd20f6afe1e7a77e2a26f1
Reviewed-on: https://go-review.googlesource.com/c/go/+/403058
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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Following discussion on #43724, change os/exec to take the
approach of golang.org/x/sys/execabs, refusing to respect
path entries mentioning relative paths by default.
Code that insists on being able to find executables in relative
directories in the path will need to add a couple lines to override the error.
See the updated package docs in exec.go for more details.
Fixes #43724.
Fixes #43947.
Change-Id: I73c1214f322b60b4167a23e956e933d50470fe13
Reviewed-on: https://go-review.googlesource.com/c/go/+/381374
Reviewed-by: Bryan Mills <bcmills@google.com>
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