linux-stable.git/tools/include/nolibc, branch linux-6.10.y

tools/nolibc: powerpc: limit stack-protector workaround to GCC

2024-10-10T10:00:25+00:00

[ Upstream commit 1daea158d0aae0770371f3079305a29fdb66829e ]

As mentioned in the comment, the workaround for
__attribute__((no_stack_protector)) is only necessary on GCC.
Avoid applying the workaround on clang, as clang does not recognize
__attribute__((__optimize__)) and would fail.

Acked-by: Willy Tarreau 
Link: https://lore.kernel.org/r/20240807-nolibc-llvm-v2-3-c20f2f5fc7c2@weissschuh.net
Signed-off-by: Thomas Weißschuh 
Signed-off-by: Sasha Levin

tools/nolibc: include arch.h from string.h

2024-10-04T14:33:43+00:00

commit 6ea2987c9a7b6c5f37d08a3eaa664c9ff7467670 upstream.

string.h tests for the macros NOLIBC_ARCH_HAS_$FUNC to use the
architecture-optimized function variants.
However if string.h is included before arch.h header then that check
does not work, leading to duplicate function definitions.

Fixes: 553845eebd60 ("tools/nolibc: x86-64: Use `rep movsb` for `memcpy()` and `memmove()`")
Fixes: 12108aa8c1a1 ("tools/nolibc: x86-64: Use `rep stosb` for `memset()`")
Cc: stable@vger.kernel.org
Acked-by: Willy Tarreau 
Link: https://lore.kernel.org/r/20240725-arch-has-func-v1-1-5521ed354acd@weissschuh.net
Signed-off-by: Thomas Weißschuh 
Signed-off-by: Greg Kroah-Hartman

tools/nolibc: add support for uname(2)

2024-04-14T18:28:54+00:00

All supported kernels are assumed to use struct new_utsname.
This is validated in test_uname().

uname(2) can for example be used in ksft_min_kernel_version() from the
kernels selftest framework.

Link: https://lore.kernel.org/lkml/20240412123536.GA32444@redhat.com/
Signed-off-by: Thomas Weißschuh 
Acked-by: Willy Tarreau

tools/nolibc/string: remove open-coded strnlen()

2024-04-10T21:27:06+00:00

The same header already defines an implementation of strnlen(),
so use it.

Signed-off-by: Thomas Weißschuh

tools/nolibc: Fix strlcpy() return code and size usage

2024-04-10T21:19:02+00:00

The return code should always be strlen(src), and we should copy at most
size-1 bytes.

While we are there, make sure to null-terminate the dst buffer if we
copied something.

Signed-off-by: Rodrigo Campos 
Signed-off-by: Thomas Weißschuh

tools/nolibc: Fix strlcat() return code and size usage

2024-04-10T21:19:01+00:00

The return code should always be strlen(src) + strnlen(dst, size).

Let's make sure to copy at most size-1 bytes from src and null-terminate
the dst buffer if we did copied something.

While we can use strnlen() and strncpy() to implement strlcat(), this is
simple enough and results in shorter code when compiled.

Signed-off-by: Rodrigo Campos 
Signed-off-by: Thomas Weißschuh

tools/nolibc/string: export strlen()

2024-04-10T21:19:01+00:00

As with commit 8d304a374023, "tools/nolibc/string: export memset() and
memmove()", gcc -Os without -ffreestanding may fail to compile with:

	cc -fno-asynchronous-unwind-tables -fno-ident -s -Os -nostdlib -lgcc  -static -o test test.c
	/usr/bin/ld: /tmp/cccIasKL.o: in function `main':
	test.c:(.text.startup+0x1e): undefined reference to `strlen'
	collect2: error: ld returned 1 exit status

As on the aforementioned commit, this patch adds a section to export
this function so compilation works on those cases too.

Signed-off-by: Rodrigo Campos 
Signed-off-by: Thomas Weißschuh

tools/nolibc/stdlib: fix memory error in realloc()

2024-04-10T21:19:00+00:00

Pass user_p_len to memcpy() instead of heap->len to prevent realloc()
from copying an extra sizeof(heap) bytes from beyond the allocated
region.

Signed-off-by: Brennan Xavier McManus 
Cc: stable@vger.kernel.org
Reviewed-by: Ammar Faizi 
Fixes: 0e0ff638400be8f497a35b51a4751fd823f6bd6a ("tools/nolibc/stdlib: Implement `malloc()`, `calloc()`, `realloc()` and `free()`")
Signed-off-by: Willy Tarreau 
Signed-off-by: Thomas Weißschuh

tools/nolibc: add support for getrlimit/setrlimit

2023-12-11T21:38:35+00:00

The implementation uses the prlimit64 systemcall as that is available on
all architectures.

Signed-off-by: Thomas Weißschuh 
Link: https://lore.kernel.org/lkml/20231123-nolibc-rlimit-v1-2-a428b131de2a@weissschuh.net/
Acked-by: Willy Tarreau

tools/nolibc: drop custom definition of struct rusage

2023-12-11T21:38:34+00:00

A future commit will include linux/resource.h, which will conflict with
the private definition of struct rusage in nolibc.
Avoid the conflict by dropping the private definition and use the one
from the UAPI headers.

Signed-off-by: Thomas Weißschuh 
Link: https://lore.kernel.org/lkml/20231123-nolibc-rlimit-v1-1-a428b131de2a@weissschuh.net/
Acked-by: Willy Tarreau