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<title>grovel/arch/s390x, branch main</title>
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<updated>2022-03-08T22:21:14Z</updated>
<entry>
<title>bits/syscall.h: add landlock syscalls from linux v5.13</title>
<updated>2022-03-08T22:21:14Z</updated>
<author>
<name>Szabolcs Nagy</name>
<email>nsz@port70.net</email>
</author>
<published>2021-07-04T16:34:15Z</published>
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<id>urn:sha1:ee05b11b67d59a6c5bb4b9d661bcc20bbd0bbe7a</id>
<content type='text'>
see

  linux commit a49f4f81cb48925e8d7cbd9e59068f516e984144
  arch: Wire up Landlock syscalls

  linuxcommit 17ae69aba89dbfa2139b7f8024b757ab3cc42f59
  Merge tag 'landlock_v34' of ... jmorris/linux-security

Landlock provides for unprivileged application sandboxing. The goal of
Landlock is to enable to restrict ambient rights (e.g. global filesystem
access) for a set of processes. Landlock is inspired by seccomp-bpf but
instead of filtering syscalls and their raw arguments, a Landlock rule
can restrict the use of kernel objects like file hierarchies, according
to the kernel semantic.
</content>
</entry>
<entry>
<title>s390x: add ptrace requests from linux v5.12</title>
<updated>2022-03-08T22:19:52Z</updated>
<author>
<name>Szabolcs Nagy</name>
<email>nsz@port70.net</email>
</author>
<published>2021-05-25T21:16:43Z</published>
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<id>urn:sha1:9ffd145479c53b5eb0940dc6c3d09c060d7f3273</id>
<content type='text'>
PTRACE_OLDSETOPTIONS is old, but it was missing, PTRACE_SYSEMU and
PTRACE_SYSEMU_SINGLESTEP are new, see

  linux commit 56e62a73702836017564eaacd5212e4d0fa1c01d
  s390: convert to generic entry
</content>
</entry>
<entry>
<title>bits/syscall.h: add mount_setattr from linux v5.12</title>
<updated>2022-03-08T22:19:51Z</updated>
<author>
<name>Szabolcs Nagy</name>
<email>nsz@port70.net</email>
</author>
<published>2021-05-25T20:53:18Z</published>
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<id>urn:sha1:f7d3db5bfc4c3b2315dd8c3137f0f332e1c6896a</id>
<content type='text'>
new syscall to change the properties of a mount or a mount tree using
file descriptors which the new mount api is based on, see

  linux commit 2a1867219c7b27f928e2545782b86daaf9ad50bd
  fs: add mount_setattr()
</content>
</entry>
<entry>
<title>bits/syscall.h: add epoll_pwait2 from linux v5.11</title>
<updated>2022-03-08T22:19:36Z</updated>
<author>
<name>Szabolcs Nagy</name>
<email>nsz@port70.net</email>
</author>
<published>2021-03-07T19:21:34Z</published>
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<id>urn:sha1:b21f3ded780cc8fd8e510c99aeaf4a453d8c8a22</id>
<content type='text'>
see

  linux commit b0a0c2615f6f199a656ed8549d7dce625d77aa77
  epoll: wire up syscall epoll_pwait2

  linux commit 58169a52ebc9a733aeb5bea857bc5daa71a301bb
  epoll: add syscall epoll_pwait2

epoll_wait with struct timespec timeout instead of int. no time32 variant.
</content>
</entry>
<entry>
<title>bits/syscall.h: add process_madvise from linux v5.10</title>
<updated>2021-02-15T14:15:54Z</updated>
<author>
<name>Szabolcs Nagy</name>
<email>nsz@port70.net</email>
</author>
<published>2020-12-19T20:12:31Z</published>
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<id>urn:sha1:fd285f9dec226ca9e5377888ee24e3f8f5ada49f</id>
<content type='text'>
mainly added to linux to allow a central process management service in
android to give MADV_COLD|PAGEOUT hints for other processes, see

  linux commit ecb8ac8b1f146915aa6b96449b66dd48984caacc
  mm/madvise: introduce process_madvise() syscall: an external memory
  hinting API
</content>
</entry>
<entry>
<title>s390x: derive float_t from compiler or default to float</title>
<updated>2020-12-04T00:07:24Z</updated>
<author>
<name>Marius Hillenbrand</name>
<email>mhillen@linux.ibm.com</email>
</author>
<published>2020-12-01T14:36:34Z</published>
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<id>urn:sha1:738c4e945c1218559d36b83cbaba11459fad89c9</id>
<content type='text'>
float_t should represent the type that is used to evaluate float
expressions internally. On s390x, float_t is currently set to double.
In contrast, the isa supports single-precision float operations and
compilers by default evaluate float in single precision, which
violates the C standard (sections 5.2.4.2.2 and 7.12 in C11/C17, to be
precise). With -fexcess-precision=standard, gcc evaluates float in
double precision, which aligns with the standard yet at the cost of
added conversion instructions.

gcc-11 will drop the special case to retrofit double precision
behavior for -fexcess-precision=standard so that __FLT_EVAL_METHOD__
will be 0 on s390x in any scenario.

To improve standards compliance and compatibility with future compiler
direction, this patch changes the definition of float_t to be derived
from the compiler's __FLT_EVAL_METHOD__.
</content>
</entry>
<entry>
<title>bits/syscall.h: add __NR_close_range from linux v5.9</title>
<updated>2020-11-29T05:54:14Z</updated>
<author>
<name>Szabolcs Nagy</name>
<email>nsz@port70.net</email>
</author>
<published>2020-10-24T10:15:43Z</published>
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<id>urn:sha1:3ba370fe8d9f450d351d710066fa20afad8ce3df</id>
<content type='text'>
see

  linux commit 9b4feb630e8e9801603f3cab3a36369e3c1cf88d
  arch: wire-up close_range()

  linux commit 278a5fbaed89dacd04e9d052f4594ffd0e0585de
  open: add close_range()
</content>
</entry>
<entry>
<title>bits/syscall.h: add __NR_faccessat2 from linux v5.8</title>
<updated>2020-09-09T21:21:03Z</updated>
<author>
<name>Szabolcs Nagy</name>
<email>nsz@port70.net</email>
</author>
<published>2020-07-28T21:17:13Z</published>
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<id>urn:sha1:9b7ed9702ce8925a5a947ad3bdbba126fe955aaf</id>
<content type='text'>
the linux faccessat syscall lacks a flag argument that is necessary
to implement the posix api, see

  linux commit c8ffd8bcdd28296a198f237cc595148a8d4adfbe
  vfs: add faccessat2 syscall
</content>
</entry>
<entry>
<title>add pidfd_getfd and openat2 syscall numbers from linux v5.6</title>
<updated>2020-09-09T21:19:55Z</updated>
<author>
<name>Szabolcs Nagy</name>
<email>nsz@port70.net</email>
</author>
<published>2020-03-31T18:32:51Z</published>
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<id>urn:sha1:d990090384c6a468bb86962baf8bae7b6fd1d2bf</id>
<content type='text'>
also added clone3 on sh and m68k, on sh it's still missing (not
yet wired up), but reserved so safe to add.

see

  linux commit fddb5d430ad9fa91b49b1d34d0202ffe2fa0e179
  open: introduce openat2(2) syscall

  linux commit 9a2cef09c801de54feecd912303ace5c27237f12
  arch: wire up pidfd_getfd syscall

  linux commit 8649c322f75c96e7ced2fec201e123b2b073bf09
  pid: Implement pidfd_getfd syscall

  linux commit e8bb2a2a1d51511e6b3f7e08125d52ec73c11139
  m68k: Wire up clone3() syscall
</content>
</entry>
<entry>
<title>deduplicate __pthread_self thread pointer adjustment out of each arch</title>
<updated>2020-08-27T22:36:45Z</updated>
<author>
<name>Rich Felker</name>
<email>dalias@aerifal.cx</email>
</author>
<published>2020-08-25T02:23:08Z</published>
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<id>urn:sha1:3a5b9ae7cf656648c80fe155a5239d9b4fb4c485</id>
<content type='text'>
the adjustment made is entirely a function of TLS_ABOVE_TP and
TP_OFFSET. aside from avoiding repetition of the TP_OFFSET value and
arithmetic, this change makes pthread_arch.h independent of the
definition of struct __pthread from pthread_impl.h. this in turn will
allow inclusion of pthread_arch.h to be moved to the top of
pthread_impl.h so that it can influence the definition of the
structure.

previously, arch files were very inconsistent about the type used for
the thread pointer. this change unifies the new __get_tp interface to
always use uintptr_t, which is the most correct when performing
arithmetic that may involve addresses outside the actual pointed-to
object (due to TP_OFFSET).
</content>
</entry>
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