release 9.0.0 branch: fix directory open rights#6479
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pchickey merged 3 commits intorelease-9.0.0from May 31, 2023
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May 30, 2023 15:28
in order to work with wasi-testsuite, it needs to be possible to path_open(dirfd, ".", ...) with the same rights reported in the fdstat of that dirfd. When we report the Rights::all() set, both FD_READ and FD_WRITE are set in the base rights, which results in unix rejecting an openat2(dirfd, ".", O_RDWR) with EISDIR. By not having the FD_READ and FD_WRITE rights present in the base rights, the open syscall defaults to O_RDONLY, which is the only access mode allowed for opening directories.
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Backport of fixes added to #6463.
Fix to the fixes that became 9.0.2 release: #6462 and #6471. We intend to merge this PR and ship it as patch release 9.0.3.
In order to work with wasi-testsuite, it needs to be possible to
path_open(dirfd, ".", ...) with the same rights reported in the
fdstat of that dirfd. When we report the Rights::all() set, both
FD_READ and FD_WRITE are set in the base rights, which results in
unix rejecting an openat2(dirfd, ".", O_RDWR) with EISDIR.
By not having the FD_READ and FD_WRITE rights present in the base
rights, the open syscall defaults to O_RDONLY, which is the only
access mode allowed for opening directories.
Note: wasi-testsuite is used to test our wasi-common implementation upstream, but not in this release branch, which is why this problem did not get caught before releasing 9.0.2.