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Filename Latest commit message Latest commit date
Rasmus Villemoes c8938263e6 tools/nolibc/string: Fix memcmp() implementation
commit b3f4f51ea68a495f8a5956064c33dce711a2df91 upstream.

The C standard says that memcmp() must treat the buffers as consisting
of "unsigned chars". If char happens to be unsigned, the casts are ok,
but then obviously the c1 variable can never contain a negative
value. And when char is signed, the casts are wrong, and there's still
a problem with using an 8-bit quantity to hold the difference, because
that can range from -255 to +255.

For example, assuming char is signed, comparing two 1-byte buffers,
one containing 0x00 and another 0x80, the current implementation would
return -128 for both memcmp(a, b, 1) and memcmp(b, a, 1), whereas one
of those should of course return something positive.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Fixes: 66b6f755ad ("rcutorture: Import a copy of nolibc")
Cc: stable@vger.kernel.org # v5.0+
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-11-10 17:57:55 +01:00
arch x86/unwind/orc: Fix unreliable stack dump with gcov 2022-11-03 23:56:55 +09:00
block block, bfq: protect 'bfqd->queued' by 'bfqd->lock' 2022-11-10 17:57:54 +01:00
certs
crypto
Documentation arm64: errata: Remove AES hwcap for COMPAT tasks 2022-10-29 10:20:35 +02:00
drivers binder: fix UAF of alloc->vma in race with munmap() 2022-11-10 17:57:54 +01:00
fs btrfs: fix type of parameter generation in btrfs_get_dentry 2022-11-10 17:57:55 +01:00
include tcp/udp: Make early_demux back namespacified. 2022-11-10 17:57:55 +01:00
init
ipc memcg: enable accounting of ipc resources 2022-11-10 17:57:54 +01:00
kernel kprobe: reverse kp->flags when arm_kprobe failed 2022-11-10 17:57:55 +01:00
lib
LICENSES
mm mm,hugetlb: take hugetlb_lock before decrementing h->resv_huge_pages 2022-11-03 23:56:54 +09:00
net tcp/udp: Make early_demux back namespacified. 2022-11-10 17:57:55 +01:00
samples
scripts kbuild: remove the target in signal traps when interrupted 2022-10-26 13:22:46 +02:00
security
sound ALSA: aoa: Fix I2S device accounting 2022-11-03 23:56:56 +09:00
tools tools/nolibc/string: Fix memcmp() implementation 2022-11-10 17:57:55 +01:00
usr
virt KVM: arm64: vgic: Fix exit condition in scan_its_table() 2022-10-29 10:20:35 +02:00
.clang-format
.cocciconfig
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COPYING
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MAINTAINERS
Makefile Linux 5.4.223 2022-11-03 23:56:57 +09:00
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.