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git-compat-util: allow root to access both SUDO_UID and root owned

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Previous changes introduced a regression which will prevent root for
accessing repositories owned by thyself if using sudo because SUDO_UID
takes precedence.

Loosen that restriction by allowing root to access repositories owned
by both uid by default and without having to add a safe.directory
exception.

A previous workaround that was documented in the tests is no longer
needed so it has been removed together with its specially crafted
prerequisite.

Helped-by: Johanness Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Carlo Marcelo Arenas Belón <carenas@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Carlo Marcelo Arenas Belón 2022-06-17 13:23:38 -07:00 committed by Junio C Hamano
parent b9063afda1
commit 6b11e3d52e
3 changed files with 11 additions and 18 deletions
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7
Documentation/config/safe.txt
View file

@ -30,12 +30,13 @@ that you deem safe.
As explained, Git only allows you to access repositories owned by
yourself, i.e. the user who is running Git, by default. When Git
is running as 'root' in a non Windows platform that provides sudo,
however, git checks the SUDO_UID environment variable that sudo creates
and will allow access to the uid recorded as its value instead.
however, git checks the SUDO_UID environment variable that sudo creates
and will allow access to the uid recorded as its value in addition to
the id from 'root'.
This is to make it easy to perform a common sequence during installation
"make && sudo make install". A git process running under 'sudo' runs as
'root' but the 'sudo' command exports the environment variable to record
which id the original user has.
If that is not what you would prefer and want git to only trust
repositories that are owned by root instead, then you must remove
repositories that are owned by root instead, then you can remove
the `SUDO_UID` variable from root's environment before invoking git.

7
git-compat-util.h
View file

@ -447,7 +447,12 @@ static inline int is_path_owned_by_current_uid(const char *path)
euid = geteuid();
if (euid == ROOT_UID)
extract_id_from_env("SUDO_UID", &euid);
{
if (st.st_uid == ROOT_UID)
return 1;
else
extract_id_from_env("SUDO_UID", &euid);
}
return st.st_uid == euid;
}

15
t/t0034-root-safe-directory.sh
View file

@ -68,7 +68,7 @@ test_expect_success 'can access if addressed explicitly' '
)
'
test_expect_failure SUDO 'can access with sudo if root' '
test_expect_success SUDO 'can access with sudo if root' '
(
cd root/p &&
sudo git status
@ -85,19 +85,6 @@ test_expect_success SUDO 'can access with sudo if root by removing SUDO_UID' '
)
'
test_lazy_prereq SUDO_SUDO '
sudo sudo id -u >u &&
id -u root >r &&
test_cmp u r
'
test_expect_success SUDO_SUDO 'can access with sudo abusing SUDO_UID' '
(
cd root/p &&
sudo sudo git status
)
'
# this MUST be always the last test
test_expect_success SUDO 'cleanup' '
sudo rm -rf root