iov: Bypass usercopy hardening for kernel iterators#612
Open
blktests-ci[bot] wants to merge 1 commit intolinus-master_basefrom
Open
iov: Bypass usercopy hardening for kernel iterators#612blktests-ci[bot] wants to merge 1 commit intolinus-master_basefrom
blktests-ci[bot] wants to merge 1 commit intolinus-master_basefrom
Conversation
Author
|
Upstream branch: af4e9ef |
Author
|
Upstream branch: af4e9ef |
blktests-ci
bot
force-pushed
the
linus-master_base
branch
from
d4e9bad to
ecd10e2
Compare
blktests-ci
bot
force-pushed
the
series/1060724=>linus-master
branch
from
2b94c84 to
cd79156
Compare
blktests-ci
bot
force-pushed
the
linus-master_base
branch
from
ecd10e2 to
d0e1bed
Compare
Author
|
Upstream branch: af4e9ef |
blktests-ci
bot
force-pushed
the
series/1060724=>linus-master
branch
from
cd79156 to
731da92
Compare
blktests-ci
bot
force-pushed
the
linus-master_base
branch
from
d0e1bed to
6b51c57
Compare
Author
|
Upstream branch: 0031c06 |
blktests-ci
bot
force-pushed
the
series/1060724=>linus-master
branch
from
731da92 to
cd0bc18
Compare
blktests-ci
bot
force-pushed
the
linus-master_base
branch
from
6b51c57 to
78036b2
Compare
Author
|
Upstream branch: ecc64d2 |
blktests-ci
bot
force-pushed
the
series/1060724=>linus-master
branch
from
cd0bc18 to
677ac1e
Compare
blktests-ci
bot
force-pushed
the
linus-master_base
branch
from
78036b2 to
bbb3394
Compare
Author
|
Upstream branch: c107785 |
blktests-ci
bot
force-pushed
the
series/1060724=>linus-master
branch
from
677ac1e to
65595d1
Compare
blktests-ci
bot
force-pushed
the
linus-master_base
branch
from
bbb3394 to
901a429
Compare
Author
|
Upstream branch: 5ee8dbf |
blktests-ci
bot
force-pushed
the
series/1060724=>linus-master
branch
from
65595d1 to
1edc59e
Compare
blktests-ci
bot
force-pushed
the
linus-master_base
branch
from
901a429 to
1f19ba6
Compare
Author
|
Upstream branch: 1f318b9 |
blktests-ci
bot
force-pushed
the
series/1060724=>linus-master
branch
from
1edc59e to
66fe4dd
Compare
blktests-ci
bot
force-pushed
the
linus-master_base
branch
from
1f19ba6 to
e79276a
Compare
Author
|
Upstream branch: None |
blktests-ci
bot
force-pushed
the
series/1060724=>linus-master
branch
from
66fe4dd to
70a51a8
Compare
blktests-ci
bot
force-pushed
the
linus-master_base
branch
from
e79276a to
0dd9afc
Compare
Author
|
Upstream branch: 80234b5 |
Profiling NFSD under an iozone workload showed that hardened usercopy checks consume roughly 1.3% of CPU in the TCP receive path. The runtime check in check_object_size() validates that copy buffers reside in expected slab regions, which is meaningful when data crosses the user/kernel boundary but adds no value when both source and destination are kernel addresses. Split check_copy_size() so that copy_to_iter() can bypass the runtime check_object_size() call for kernel-only iterators (ITER_BVEC, ITER_KVEC). Existing callers of check_copy_size() are unaffected; user-backed iterators still receive the full usercopy validation. This benefits all kernel consumers of copy_to_iter(), including the TCP receive path used by the NFS client and server, NVMe-TCP, and any other subsystem that uses ITER_BVEC or ITER_KVEC receive buffers. Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
blktests-ci
bot
force-pushed
the
series/1060724=>linus-master
branch
from
70a51a8 to
c6bf057
Compare
This file contains hidden or 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
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Pull request for series with
subject: iov: Bypass usercopy hardening for kernel iterators
version: 1
url: https://patchwork.kernel.org/project/linux-block/list/?series=1060724