linux-stable.git/tools/include/nolibc, branch v6.11

tools/nolibc: implement strerror()

2024-06-29T07:44:57+00:00

strerror() is commonly used.
For example in kselftest which currently needs to do an #ifdef NOLIBC to
handle the lack of strerror().

Keep it simple and reuse the output format of perror() for strerror().

Acked-by: Shuah Khan 
Signed-off-by: Thomas Weißschuh

tools/nolibc: implement strtol() and friends

2024-06-29T07:44:55+00:00

The implementation always works on uintmax_t values.

This is inefficient when only 32bit are needed.
However for all functions this only happens for strtol() on 32bit
platforms.

Signed-off-by: Thomas Weißschuh 
Acked-by: Willy Tarreau 
Link: https://lore.kernel.org/r/20240425-nolibc-strtol-v1-2-bfeef7846902@weissschuh.net

tools/nolibc: add limits for {u,}intmax_t, ulong and {u,}llong

2024-06-29T07:44:54+00:00

They are useful for users and necessary for strtol() and friends.

Signed-off-by: Thomas Weißschuh 
Acked-by: Willy Tarreau 
Link: https://lore.kernel.org/r/20240425-nolibc-strtol-v1-1-bfeef7846902@weissschuh.net

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