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Filename Latest commit message Latest commit date
Eric W. Biederman 33a2e62473 capabilities: Don't allow writing ambiguous v3 file capabilities 
[ Upstream commit 95ebabde382c371572297915b104e55403674e73 ]

The v3 file capabilities have a uid field that records the filesystem
uid of the root user of the user namespace the file capabilities are
valid in.

When someone is silly enough to have the same underlying uid as the
root uid of multiple nested containers a v3 filesystem capability can
be ambiguous.

In the spirit of don't do that then, forbid writing a v3 filesystem
capability if it is ambiguous.

Fixes: 8db6c34f1d ("Introduce v3 namespaced file capabilities")
Reviewed-by: Andrew G. Morgan <morgan@kernel.org>
Reviewed-by: Serge Hallyn <serge@hallyn.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-03-04 10:26:26 +01:00
arch MIPS: properly stop .eh_frame generation 2021-03-04 10:26:21 +01:00
block bsg: free the request before return error code 2021-03-04 10:26:22 +01:00
certs
crypto crypto: ecdh_helper - Ensure 'len >= secret.len' in decode_key() 2021-03-04 10:26:25 +01:00
Documentation KVM: Forbid the use of tagged userspace addresses for memslots 2021-02-03 23:25:57 +01:00
drivers hwrng: timeriomem - Fix cooldown period calculation 2021-03-04 10:26:24 +01:00
fs ubifs: Fix error return code in alloc_wbufs() 2021-03-04 10:26:26 +01:00
include ima: Free IMA measurement buffer after kexec syscall 2021-03-04 10:26:25 +01:00
init fgraph: Initialize tracing_graph_pause at task creation 2021-02-10 09:25:29 +01:00
ipc
kernel ima: Free IMA measurement buffer after kexec syscall 2021-03-04 10:26:25 +01:00
lib udp: fix skb_copy_and_csum_datagram with odd segment sizes 2021-02-17 10:35:19 +01:00
LICENSES
mm mm: provide a saner PTE walking API for modules 2021-02-26 10:10:28 +01:00
net bpf: Fix bpf_fib_lookup helper MTU check for SKB ctx 2021-03-04 10:26:17 +01:00
samples samples: bpf: Fix lwt_len_hist reusing previous BPF map 2020-12-30 11:51:12 +01:00
scripts scripts/recordmcount.pl: support big endian for ARCH sh 2021-02-26 10:10:28 +01:00
security capabilities: Don't allow writing ambiguous v3 file capabilities 2021-03-04 10:26:26 +01:00
sound ASoC: simple-card-utils: Fix device module clock 2021-03-04 10:26:25 +01:00
tools selftests: txtimestamp: fix compilation issue 2021-02-17 10:35:17 +01:00
usr
virt KVM: Use kvm_pfn_t for local PFN variable in hva_to_pfn_remapped() 2021-02-26 10:10:28 +01:00
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Makefile Linux 5.4.101 2021-02-26 10:10:28 +01:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.