kernel/linux.git/tools/include/nolibc, branch v6.6.131

tools/nolibc/stdio: let perror work when NOLIBC_IGNORE_ERRNO is set

2026-01-11T14:21:17+00:00

[ Upstream commit c485ca3aff2442adea4c08ceb5183e671ebed22a ] There is no errno variable when NOLIBC_IGNORE_ERRNO is defined. As such, simply print the message with "unknown error" rather than the integer value of errno. Fixes: acab7bcdb1bc ("tools/nolibc/stdio: add perror() to report the errno value") Signed-off-by: Benjamin Berg Signed-off-by: Thomas Weißschuh Signed-off-by: Sasha Levin

tools/nolibc: make time_t robust if __kernel_old_time_t is missing in host headers

2025-10-15T09:57:54+00:00

[ Upstream commit 0ff52df6b32a6b04a7c9dfe3d7a387aff215b482 ] Commit d5094bcb5bfd ("tools/nolibc: define time_t in terms of __kernel_old_time_t") made nolibc use the kernel's time type so that `time_t` matches `timespec::tv_sec` on all ABIs (notably x32). But since __kernel_old_time_t is fairly new, notably from 2020 in commit 94c467ddb273 ("y2038: add __kernel_old_timespec and __kernel_old_time_t"), nolibc builds that rely on host headers may fail. Switch to __kernel_time_t, which is the same as __kernel_old_time_t and has existed for longer. Tested in PPC VM of Open Source Lab of Oregon State University (./tools/testing/selftests/rcutorture/bin/mkinitrd.sh) Fixes: d5094bcb5bfd ("tools/nolibc: define time_t in terms of __kernel_old_time_t") Signed-off-by: Zhouyi Zhou [Thomas: Reformat commit and its message a bit] Signed-off-by: Thomas Weißschuh Signed-off-by: Sasha Levin

tools/nolibc: fix spelling of FD_SETBITMASK in FD_* macros

2025-08-28T14:28:32+00:00

commit a477629baa2a0e9991f640af418e8c973a1c08e3 upstream. While nolibc-test does test syscalls, it doesn't test as much the rest of the macros, and a wrong spelling of FD_SETBITMASK in commit feaf75658783a broke programs using either FD_SET() or FD_CLR() without being noticed. Let's fix these macros. Fixes: feaf75658783a ("nolibc: fix fd_set type") Cc: stable@vger.kernel.org # v6.2+ Acked-by: Thomas Weißschuh Signed-off-by: Willy Tarreau Signed-off-by: Greg Kroah-Hartman

tools/nolibc: define time_t in terms of __kernel_old_time_t

2025-08-28T14:28:17+00:00

[ Upstream commit d5094bcb5bfdfea2cf0de8aaf77cc65db56cbdb5 ] Nolibc assumes that the kernel ABI is using a time values that are as large as a long integer. For most ABIs this holds true. But for x32 this is not correct, as it uses 32bit longs but 64bit times. Also the 'struct stat' implementation of nolibc relies on timespec::tv_sec and time_t being the same type. While timespec::tv_sec comes from the kernel and is of type __kernel_old_time_t, time_t is defined within nolibc. Switch to the __kernel_old_time_t to always get the correct type. Signed-off-by: Thomas Weißschuh Link: https://lore.kernel.org/r/20250712-nolibc-x32-v1-1-6d81cb798710@weissschuh.net Acked-by: Willy Tarreau Signed-off-by: Sasha Levin

tools/nolibc: s390: include std.h

2024-12-09T09:32:45+00:00

commit 711b5875814b2a0e9a5aaf7a85ba7c80f5a389b1 upstream. arch-s390.h uses types from std.h, but does not include it. Depending on the inclusion order the compilation can fail. Include std.h explicitly to avoid these errors. Fixes: 404fa87c0eaf ("tools/nolibc: s390: provide custom implementation for sys_fork") Cc: stable@vger.kernel.org Signed-off-by: Thomas Weißschuh Link: https://lore.kernel.org/r/20240927-nolibc-s390-std-h-v1-1-30442339a6b9@linutronix.de Signed-off-by: Thomas Weißschuh Signed-off-by: Greg Kroah-Hartman

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

2024-10-10T09:57:30+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/stdlib: fix memory error in realloc()

2024-06-12T09:11:19+00:00

commit 791f4641142e2aced85de082e5783b4fb0b977c2 upstream. 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 Signed-off-by: Greg Kroah-Hartman

tools/nolibc: mark start_c as weak

2023-10-12T19:13:51+00:00

Otherwise the different instances of _start_c from each compilation unit will lead to linker errors: /usr/bin/ld: /tmp/ccSNvRqs.o: in function `_start_c': nolibc-test-foo.c:(.text.nolibc_memset+0x9): multiple definition of `_start_c'; /tmp/ccG25101.o:nolibc-test.c:(.text+0x1ea3): first defined here Fixes: 17336755150b ("tools/nolibc: add new crt.h with _start_c") Signed-off-by: Thomas Weißschuh Link: https://lore.kernel.org/lkml/20231012-nolibc-start_c-multiple-v1-1-fbfc73e0283f@weissschuh.net/ Link: https://lore.kernel.org/lkml/20231012-nolibc-linkage-test-v1-1-315e682768b4@weissschuh.net/ Acked-by: Willy Tarreau

tools/nolibc: i386: Fix a stack misalign bug on _start

2023-10-12T19:10:37+00:00

The ABI mandates that the %esp register must be a multiple of 16 when executing a 'call' instruction. Commit 2ab446336b17 ("tools/nolibc: i386: shrink _start with _start_c") simplified the _start function, but it didn't take care of the %esp alignment, causing SIGSEGV on SSE and AVX programs that use aligned move instruction (e.g., movdqa, movaps, and vmovdqa). The 'and $-16, %esp' aligns the %esp at a multiple of 16. Then 'push %eax' will subtract the %esp by 4; thus, it breaks the 16-byte alignment. Make sure the %esp is correctly aligned after the push by subtracting 12 before the push. Extra: Add 'add $12, %esp' before the 'and $-16, %esp' to avoid over-estimating for particular cases as suggested by Willy. A test program to validate the %esp alignment on _start can be found at: https://lore.kernel.org/lkml/ZOoindMFj1UKqo+s@biznet-home.integral.gnuweeb.org [ Thomas: trim Fixes tag commit id ] Cc: Zhangjin Wu Fixes: 2ab446336b17 ("tools/nolibc: i386: shrink _start with _start_c") Reported-by: Nicholas Rosenberg Acked-by: Thomas Weißschuh Signed-off-by: Ammar Faizi Reviewed-by: Alviro Iskandar Setiawan Signed-off-by: Willy Tarreau Signed-off-by: Thomas Weißschuh

tools/nolibc: avoid undesired casts in the __sysret() macro

2023-08-23T03:17:07+00:00

Having __sysret() as an inline function has the unfortunate effect of adding casts and large constants comparisons after the syscall returns that significantly inflate some light code that's otherwise syscall- heavy. Even nolibc-test grew by ~1%. Let's switch back to a macro for this, and use it only with signed arguments. Note that it is also possible to design a slightly more complex macro covering unsigned and pointers but we only have 3 such syscalls so it is pointless, and these were just addressed not to use this macro anymore. Now for the argument (the local variable containing the syscall return value), any negative value is an error, that results in -1 being returned and errno to be assigned the opposite value. This may be revisited again in the future if really needed but for now let's get back to something sane. Fixes: 428905da6ec4 ("tools/nolibc: sys.h: add a syscall return helper") Link: https://lore.kernel.org/lkml/20230806095846.GB10627@1wt.eu/ Link: https://lore.kernel.org/lkml/ZNKOJY+g66nkIyvv@1wt.eu/ Cc: Zhangjin Wu Cc: David Laight Cc: Thomas Weißschuh Signed-off-by: Willy Tarreau