https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276043
Bug ID: 276043
Summary: fread(3) is truncated when reading from
pseudo-filesystems
Product: Base System
Version: 14.0-STABLE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: [email protected]
Reporter: [email protected]
I was looking why the output of `md5 /compat/linux/proc/cpuinfo` is different
from `cat /compat/linux/proc/cpuinfo | md5` and came across this code in
sbin/md5/md5.c:
```
char block[4096];
..
while ((len = fread(block, 1, sizeof(block), f)) > 0) {
```
```
The issue is a truncated read as confirmed by truss and GNU wc:
```
$ sudo truss md5 /compat/linux/proc/cpuinfo
..
read(3,"processor\t: 0\nvendor_id\t: Gen"...,4096) = 3549 (0xddd)
..
```
It obviously affects all tools using libc when comparing the output of wc vs.
GNU wc:
```
$ wc -m /compat/linux/proc/cpuinfo
3549 /compat/linux/proc/cpuinfo
$ gwc -m /compat/linux/proc/cpuinfo
3685 /compat/linux/proc/cpuinfo
```
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