mkdir: do not error out with -EEXIST for racing MkdirAlls#35
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Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
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If two programs are doing MkdirAll, the previous logic would return an error if a directory already existed once we got into the "mkdir" portion of the creation. Since we already have to accept that an attacker can swap the inode with a different directory, returning -EEXIST from mkdirat(2) just causes spurious errors. All we care about is that we open a directory. Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
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Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
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This was referenced Dec 6, 2024
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Sorry, probably should've waited for a review before merging + releasing. 😅 |
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If two programs are doing MkdirAll, the previous logic would return an
error if a directory already existed once we got into the "mkdir"
portion of the creation.
Since we already have to accept that an attacker can swap the inode with
a different directory, returning -EEXIST from mkdirat(2) just causes
spurrious errors. All we care about is that we open a directory.
Ref: opencontainers/runc#4543
Ref: moby/buildkit#5566
Signed-off-by: Aleksa Sarai cyphar@cyphar.com