linux-stable.git/tools/include/nolibc, branch v6.4.7

tools/nolibc: ensure stack protector guard is never zero

2023-07-27T06:56:48+00:00

[ Upstream commit 88fc7eb54ecc6db8b773341ce39ad201066fa7da ]

The all-zero pattern is one of the more probable out-of-bound writes so
add a special case to not accidentally accept it.

Also it enables the reliable detection of stack protector initialization
during testing.

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

tools/nolibc: ensure fast64 integer types have 64 bits

2023-07-19T14:35:18+00:00

[ Upstream commit f9bf5944d37b75b8238349d4fb5b7a97bbecfc9d ]

On 32bit platforms size_t is not enough to represent [u]int_fast64_t.

Fixes: 3e9fd4e9a1d5 ("tools/nolibc: add integer types and integer limit macros")
Signed-off-by: Thomas Weißschuh 
Signed-off-by: Willy Tarreau 
Signed-off-by: Paul E. McKenney 
Signed-off-by: Sasha Levin

tools/nolibc: x86_64: disable stack protector for _start

2023-07-05T17:30:30+00:00

commit 7a9b2345202a14dfec9081994486156f7a691513 upstream.

This was forgotten in the original submission.

It is unknown why it worked for x86_64 on some compiler without this
attribute.

Reported-by: Willy Tarreau 
Closes: https://lore.kernel.org/lkml/20230520133237.GA27501@1wt.eu/
Fixes: 0d8c461adbc4 ("tools/nolibc: x86_64: add stackprotector support")
Signed-off-by: Thomas Weißschuh 
Signed-off-by: Willy Tarreau 
Signed-off-by: Paul E. McKenney 
Signed-off-by: Greg Kroah-Hartman

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