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crosvm/common/p9
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Daniel Verkamp 53cd18e062 p9: use *at() functions for set_attr 
Use fchmodat(), fchownat(), and utimensat() to implement the SET_ATTR
request rather than using the non-'at' variants of these functions.
These can operate on a file descriptor path using the /proc file handle
and "self/fd/N" filename to modify the attributes of a file without
actually opening it, which means we can avoid problems like not being
able to open a read-only file with O_RDWR, which happened previously
with chmod requests.

This means we don't need to open the file at all, except in the case of
a request that needs to set the size, since there is no equivalent
truncateat() function.

BUG=chromium:1369647
TEST=touch /mnt/chromeos/MyFiles/Downloads/hello.txt
TEST=chmod -w /mnt/chromeos/MyFiles/Downloads/hello.txt
TEST=chmod +w /mnt/chromeos/MyFiles/Downloads/hello.txt
TEST=chmod a-r /mnt/chromeos/MyFiles/Downloads/hello.txt
TEST=chmod a+r /mnt/chromeos/MyFiles/Downloads/hello.txt
TEST=chown $USER /mnt/chromeos/MyFiles/Downloads/hello.txt
TEST=truncate -s1 /mnt/chromeos/MyFiles/Downloads/hello.txt

Change-Id: I0461ed231cc78b26bcc37ede1a364af984c87f8b
Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/3935537
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Keiichi Watanabe <keiichiw@chromium.org>
Commit-Queue: Daniel Verkamp <dverkamp@chromium.org>
2022-10-10 17:50:07 +00:00
..
fuzz Update all copyright headers to match new style 2022-09-13 18:41:29 +00:00
src p9: use *at() functions for set_attr 2022-10-10 17:50:07 +00:00
wire_format_derive Update all copyright headers to match new style 2022-09-13 18:41:29 +00:00
Cargo.lock Add Cargo.lock files to version control again 2022-08-15 19:38:44 +00:00
Cargo.toml crosvm: add serde to arg types 2022-06-30 17:47:59 +00:00
OWNERS p9: re-add OWNERS file for fuzzer ownership 2022-01-10 20:43:27 +00:00
README.md docs: Use mdformat to format markdown files 2022-01-27 21:29:11 +00:00

README.md

p9 - Server implementation of the 9p file system protocol

This directory contains the protocol definition and a server implementation of the 9p file system protocol.

  • wire_format_derive - A procedural macro that derives the serialization and de-serialization implementation for a struct into the 9p wire format.
  • src/protocol - Defines all the messages used in the 9p protocol. Also implements serialization and de-serialization for some base types (integers, strings, vectors) that form the foundation of all 9p messages. Wire format implementations for all other messages are derived using the wire_format_derive macro.
  • src/server.rs - Implements a full 9p server, carrying out file system requests on behalf of clients.