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17 May 2024, 11:00:25 UTC
Revision fc8162e3c034af743d8def435fda6396603d321f authored by Andy Grover on 28 October 2010, 15:40:58 UTC, committed by David S. Miller on 30 October 2010, 23:34:17 UTC 
RDS: Copy rds_iovecs into kernel memory instead of rereading from userspace
 
Change rds_rdma_pages to take a passed-in rds_iovec array instead
of doing copy_from_user itself.

Change rds_cmsg_rdma_args to copy rds_iovec array once only. This
eliminates the possibility of userspace changing it after our
sanity checks.

Implement stack-based storage for small numbers of iovecs, based
on net/socket.c, to save an alloc in the extremely common case.

Although this patch reduces iovec copies in cmsg_rdma_args to 1,
we still do another one in rds_rdma_extra_size. Getting rid of
that one will be trickier, so it'll be a separate patch.

Signed-off-by: Andy Grover <andy.grover@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent f4a3fc0
History
Tip revision: fc8162e3c034af743d8def435fda6396603d321f authored by Andy Grover on 28 October 2010, 15:40:58 UTC
RDS: Copy rds_iovecs into kernel memory instead of rereading from userspace
Tip revision: fc8162e
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security
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usr
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.gitignore -rw-r--r-- 936 bytes
.mailmap -rw-r--r-- 3.9 KB
COPYING -rw-r--r-- 18.3 KB
CREDITS -rw-r--r-- 91.8 KB
Kbuild -rw-r--r-- 2.5 KB
MAINTAINERS -rw-r--r-- 178.2 KB
Makefile -rw-r--r-- 51.2 KB
README -rw-r--r-- 17.0 KB
REPORTING-BUGS -rw-r--r-- 3.3 KB

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