linux-stable.git/tools/include/nolibc, branch v6.4

Merge tag 'linux-kselftest-next-6.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest

2023-04-24T19:28:34+00:00

Pull Kselftest updates from Shuah Khan:

 - several patches to enhance and fix resctrl test

 - nolibc support for kselftest with an addition to vprintf() to
   tools/nolibc/stdio and related test changes

 - Refactor 'peeksiginfo' ptrace test part

 - add 'malloc' failures checks in cgroup test_memcontrol

 - a new prctl test

 - enhancements sched test with additional ore schedule prctl calls

* tag 'linux-kselftest-next-6.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest: (25 commits)
  selftests/resctrl: Fix incorrect error return on test complete
  selftests/resctrl: Remove duplicate codes that clear each test result file
  selftests/resctrl: Commonize the signal handler register/unregister for all tests
  selftests/resctrl: Cleanup properly when an error occurs in CAT test
  selftests/resctrl: Flush stdout file buffer before executing fork()
  selftests/resctrl: Return MBA check result and make it to output message
  selftests/resctrl: Fix set up schemata with 100% allocation on first run in MBM test
  selftests/resctrl: Use correct exit code when tests fail
  kselftest/arm64: Convert za-fork to use kselftest.h
  kselftest: Support nolibc
  tools/nolibc/stdio: Implement vprintf()
  selftests/resctrl: Correct get_llc_perf() param in function comment
  selftests/resctrl: Use remount_resctrlfs() consistently with boolean
  selftests/resctrl: Change name from CBM_MASK_PATH to INFO_PATH
  selftests/resctrl: Change initialize_llc_perf() return type to void
  selftests/resctrl: Replace obsolete memalign() with posix_memalign()
  selftests/resctrl: Check for return value after write_schemata()
  selftests/resctrl: Allow ->setup() to return errors
  selftests/resctrl: Move ->setup() call outside of test specific branches
  selftests/resctrl: Return NULL if malloc_and_init_memory() did not alloc mem
  ...

tools/nolibc/stdio: Implement vprintf()

2023-04-11T20:10:42+00:00

vprintf() is equivalent to vfprintf() to stdout so implement it as a simple
wrapper for the existing vfprintf(), allowing us to build kselftest.h.

Suggested-by: Willy Tarreau 
Signed-off-by: Mark Brown 
Acked-by: Willy Tarreau 
Acked-by: Paul E. McKenney 
Acked-by: Shuah Khan 
Signed-off-by: Shuah Khan

tools/nolibc: x86_64: add stackprotector support

2023-03-27T23:26:10+00:00

Enable the new stackprotector support for x86_64.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Willy Tarreau 
Signed-off-by: Paul E. McKenney

tools/nolibc: i386: add stackprotector support

2023-03-27T23:26:10+00:00

Enable the new stackprotector support for i386.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Willy Tarreau 
Signed-off-by: Paul E. McKenney

tools/nolibc: add support for stack protector

2023-03-27T23:26:10+00:00

This is useful when using nolibc for security-critical tools.
Using nolibc has the advantage that the code is easily auditable and
sandboxable with seccomp as no unexpected syscalls are used.
Using compiler-assistent stack protection provides another security
mechanism.

For this to work the compiler and libc have to collaborate.

This patch adds the following parts to nolibc that are required by the
compiler:

* __stack_chk_guard: random sentinel value
* __stack_chk_fail: handler for detected stack smashes

In addition an initialization function is added that randomizes the
sentinel value.

Only support for global guards is implemented.
Register guards are useful in multi-threaded context which nolibc does
not provide support for.

Link: https://lwn.net/Articles/584225/

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Willy Tarreau 
Signed-off-by: Paul E. McKenney

tools/nolibc: add helpers for wait() signal exits

2023-03-27T23:26:10+00:00

These are useful for users and will also be used in an upcoming
testcase.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Willy Tarreau 
Signed-off-by: Paul E. McKenney

tools/nolibc: add definitions for standard fds

2023-03-27T23:26:10+00:00

These are useful for users and will also be used in an upcoming
testcase.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Willy Tarreau 
Signed-off-by: Paul E. McKenney

tools/nolibc: Add support for LoongArch

2023-03-20T15:45:22+00:00

Add support for LoongArch (32 and 64 bit) to nolibc.

Signed-off-by: Feiyang Chen 
Acked-by: Huacai Chen 
Signed-off-by: Willy Tarreau 
Signed-off-by: Paul E. McKenney

tools/nolibc: Add statx() and make stat() rely on statx() if necessary

2023-03-20T15:45:22+00:00

LoongArch and RISC-V 32-bit only have statx(). ARC, Hexagon, Nios2 and
OpenRISC have statx() and stat64() but not stat() or newstat(). Add
statx() and make stat() rely on statx() if necessary to make them happy.
We may just use statx() for all architectures in the future.

Signed-off-by: Feiyang Chen 
Acked-by: Huacai Chen 
Signed-off-by: Willy Tarreau 
Signed-off-by: Paul E. McKenney

tools/nolibc: Include linux/fcntl.h and remove duplicate code

2023-03-20T15:45:22+00:00

Include linux/fcntl.h for O_* and AT_*. asm/fcntl.h is included
by linux/fcntl.h, so it can be safely removed.

Signed-off-by: Feiyang Chen 
Acked-by: Huacai Chen 
Signed-off-by: Willy Tarreau 
Signed-off-by: Paul E. McKenney