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Andrii Nakryiko 0cfbadb153 libbpf: Fix realloc API handling in zero-sized edge cases 
[ Upstream commit 8a0260dbf6 ]

realloc() and reallocarray() can either return NULL or a special
non-NULL pointer, if their size argument is zero. This requires a bit
more care to handle NULL-as-valid-result situation differently from
NULL-as-error case. This has caused real issues before ([0]), and just
recently bit again in production when performing bpf_program__attach_usdt().

This patch fixes 4 places that do or potentially could suffer from this
mishandling of NULL, including the reported USDT-related one.

There are many other places where realloc()/reallocarray() is used and
NULL is always treated as an error value, but all those have guarantees
that their size is always non-zero, so those spot don't need any extra
handling.

  [0] d08ab82f59 ("libbpf: Fix double-free when linker processes empty sections")

Fixes: 999783c8bb ("libbpf: Wire up spec management and other arch-independent USDT logic")
Fixes: b63b3c490e ("libbpf: Add bpf_program__set_insns function")
Fixes: 697f104db8 ("libbpf: Support custom SEC() handlers")
Fixes: b126882672 ("libbpf: Change the order of data and text relocations.")
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20230711024150.1566433-1-andrii@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-09-13 09:42:30 +02:00
arch s390/paes: fix PKEY_TYPE_EP11_AES handling for secure keyblobs 2023-09-13 09:42:29 +02:00
block blk-crypto: dynamically allocate fallback profile 2023-08-23 17:52:39 +02:00
certs certs: Fix build error when PKCS#11 URI contains semicolon 2023-02-09 11:28:11 +01:00
crypto crypto: rsa-pkcs1pad - Use helper to set reqsize 2023-09-13 09:42:26 +02:00
Documentation media: uapi: HEVC: Add num_delta_pocs_of_ref_rps_idx field 2023-09-13 09:42:20 +02:00
drivers cpufreq: powernow-k8: Use related_cpus instead of cpus in driver.exit() 2023-09-13 09:42:30 +02:00
fs vfs, security: Fix automount superblock LSM init problem, preventing NFS sb sharing 2023-09-13 09:42:28 +02:00
include vfs, security: Fix automount superblock LSM init problem, preventing NFS sb sharing 2023-09-13 09:42:28 +02:00
init sched/psi: Select KERNFS as needed 2023-09-13 09:42:28 +02:00
io_uring io_uring/parisc: Adjust pgoff in io_uring mmap() for parisc 2023-09-02 09:16:19 +02:00
ipc ipc: fix memory leak in init_mqueue_fs() 2022-12-31 13:32:01 +01:00
kernel sched/rt: Fix sysctl_sched_rr_timeslice intial value 2023-09-13 09:42:29 +02:00
lib maple_tree: disable mas_wr_append() when other readers are possible 2023-08-30 16:11:13 +02:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm tmpfs: verify {g,u}id mount options correctly 2023-09-13 09:42:27 +02:00
net net: Avoid address overwrite in kernel_connect 2023-09-13 09:42:26 +02:00
rust rust: allocator: Prevent mis-aligned allocation 2023-08-11 12:08:18 +02:00
samples samples: ftrace: Save required argument registers in sample trampolines 2023-07-23 13:49:44 +02:00
scripts gcc-plugins: Reorganize gimple includes for GCC 13 2023-08-16 18:27:20 +02:00
security vfs, security: Fix automount superblock LSM init problem, preventing NFS sb sharing 2023-09-13 09:42:28 +02:00
sound ALSA: seq: oss: Fix racy open/close of MIDI devices 2023-09-13 09:42:25 +02:00
tools libbpf: Fix realloc API handling in zero-sized edge cases 2023-09-13 09:42:30 +02:00
usr usr/gen_init_cpio.c: remove unnecessary -1 values from int file 2022-10-03 14:21:44 -07:00
virt KVM: Grab a reference to KVM for VM and vCPU stats file descriptors 2023-08-03 10:24:08 +02:00
.clang-format inet: ping: use hlist_nulls rcu iterator during lookup 2022-12-01 12:42:46 +01:00
.cocciconfig
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes
.gitignore Kbuild: add Rust support 2022-09-28 09:02:20 +02:00
.mailmap 9 hotfixes. 6 for MM, 3 for other areas. Four of these patches address 2022-12-10 17:10:52 -08:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Remove Michal Marek from Kbuild maintainers 2022-11-16 14:53:00 +09:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS devlink: move code to a dedicated directory 2023-08-30 16:11:00 +02:00
Makefile Linux 6.1.52 2023-09-06 21:27:03 +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.