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Fix the following CodeQL warning (CWE-253)[1]:
> Rule ID: cpp/incorrectly-checked-scanf
> The result of scanf is only checked against 0, but it can also return
> EOF.
> Functions in the scanf family return either EOF (a negative value) in
> case of IO failure, or the number of items successfully read from the
> input. Consequently, a simple check that the return value is nonzero
> is not enough.
>
> Recommendation
>
> Ensure that all uses of scanf check the return value against the
> expected number of arguments rather than just against zero.
Note: The affected code portions attempt to read values from /etc/passwd
and /etc/group, so invalid input seems unlikely to be the case. Either
way, the changes make the checks in question more consistent with
similar sscanf return value checks in the rest of the code.
Added on commit 4f003daec ("prevent leaking user information by
modifying /home directory, /etc/passwd and /etc/group", 2015-11-19).
[1] https://github.com/netblue30/firejail/security/code-scanning/32
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Environment: codespell 2.2.2-3 on Artix Linux.
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None of the files affected use any macros from linux/limits.h:
$ git grep -Fl 'NGROUPS_MAX
ARG_MAX
LINK_MAX
MAX_CANON
MAX_INPUT
NAME_MAX
PATH_MAX
PIPE_BUF
XATTR_NAME_MAX
XATTR_SIZE_MAX
XATTR_LIST_MAX
RTSIG_MAX' -- src
src/firejail/cmdline.c
src/firejail/firejail.h
src/libtrace/libtrace.c
src/libtracelog/libtracelog.c
Environment:
$ grep '^NAME' /etc/os-release
NAME="Artix Linux"
$ pacman -Qo /usr/include/linux/limits.h
/usr/include/linux/limits.h is owned by linux-api-headers 5.12.3-1
Note: This include has been present on all of the affected files since
their inception. For restrict_users.c, that's on commit 4f003daec
("prevent leaking user information by modifying /home directory,
/etc/passwd and /etc/group") and for every other file, it's on commit
137985136 ("Baseline firejail 0.9.28").
Relates to #4578.
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just in case users decide to remove them
completely from the sandbox, by means of
private-etc or whitelist
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Whitelist2
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Dumb patch that adds O_CLOEXEC to all open/fopen
calls, even where it is obviously pointless.
While at it, also add O_EXCL where it might be
considered useful, for example to clear Coverity
warnings, or on files that subsequently are used
to configure a join sandbox.
Pure defense in depth, this patch should have no
observable effects.
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mount without stash locations, only using the file descriptors
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More liberal use of an already existing fall back path in pulseaudio.c
removes issues caused by symlinks in ~/.config/pulse (issue #3351 and
some others)
Don't die, but print warnings during /home directory masking,
so that users with a symbolic link in their home directory path can
at least make it to a shell prompt (only in combination with pulseaudio fix).
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Running `firejail --noprofile --private-bin=bash,ls ls -1Za /usr/bin`
shows that the SELinux labels are not correct:
```
user_u:object_r:user_tmpfs_t:s0 .
system_u:object_r:usr_t:s0 ..
user_u:object_r:user_tmpfs_t:s0 bash
user_u:object_r:user_tmpfs_t:s0 ls
```
After fixing this:
```
system_u:object_r:bin_t:s0 .
system_u:object_r:usr_t:s0 ..
system_u:object_r:shell_exec_t:s0 bash
system_u:object_r:bin_t:s0 ls
```
Most copied files and created directories should now have correct
labels (bind mounted objects keep their labels). This is useful to
avoid having to change the SELinux rules when using Firejail.
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* move copyright statement to 2020
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#1964
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I fixed typo in a comment, it bothered me. If you don't really care about this kind of stuff, just reject this PR :)
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and /etc/group
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Kelvin M. Klann
netblue30
David Fetter
smitsohu
startx2017
Topi Miettinen
glitsj16
netblue30
startx2017
Fred Barclay
W
Aleksey Manevich