https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217957
Bug ID: 217957
Summary: diff: Cannot create unified diffs when running under
kern.trap_enotcap=1
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Keywords: patch
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: freebsd-bugs@FreeBSD.org
Reporter: to...@freebsd.org
Created attachment 181005
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=181005&action=edit
diff.diff
This happens while running 'diff -u file1 file2' (file1 and file2 need
to actually differ).
After cap_enter() and after reading file1, diff(1) will try to open
the following files which isn't allowed in capability mode:
access("/etc/localtime",R_OK) ERR#94 'Not permitted in
capability mode'
issetugid() = 0 (0x0)
open("/usr/share/zoneinfo/UTC",O_RDONLY,00) ERR#94 'Not permitted in
capability mode'
issetugid() = 0 (0x0)
open("/usr/share/zoneinfo/posixrules",O_RDONLY,06423226000) ERR#94 'Not
permitted in capability mode'
Unfortunately when kern.trap_enotcap=1 is accidentally still set, it
means diff will die immediately after access().
To workaround this we could initialize time conversion information with
tzset(3)
just before cap_enter().
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