kernel/linux.git/tools/include/nolibc, branch v7.2-rc1

tools/nolibc: cast default values of program_invocation_name

2026-05-26T19:06:12+00:00

With -Wwrite-strings the plain assignment triggers a warning as a 'const char *' is assigned to a 'char *', removing the const qualifier. Casting the const away is fine, as there is no valid modification that can be done to an empty string anyways. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260525-nolibc-write-strings-v2-1-ab5cc16c7b23@weissschuh.net

tools/nolibc: add ftruncate()

2026-05-24T21:58:04+00:00

On architectures with 32-bit longs, call the compat syscall __NR_ftruncate64. As off_t is 64-bit it must be split into 2 registers. Unlike llseek() which passes the high and low parts in explicitly named arguments, the order here is endian independent. Some architectures (arm, mips, ppc) require this pair of registers to be aligned to an even register, so add custom _sys_ftruncate64() wrappers for those. A test case for ftruncate is added which validates negative length or invalid fd return the appropriate error, and checks the length is correct on success. Co-developed-by: Jordan Richards Signed-off-by: Jordan Richards Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Reviewed-by: Daniel Palmer Link: https://patch.msgid.link/20260521-nolibc-ftruncate-v1-3-5384a83b2402@weissschuh.net

tools/nolibc: add a helper to split a 64-bit argument into 32-bit halves

2026-05-24T21:57:59+00:00

On 32-bit architectures some system calls require a single 64-bit argument to be passed as two 32-bit halves. Add a helper to easily split such arguments. This works on little and bit endian. Signed-off-by: Daniel Palmer Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260521-nolibc-ftruncate-v1-2-5384a83b2402@weissschuh.net Signed-off-by: Thomas Weißschuh

tools/nolibc: stackprotector: Avoid stalling program startup if crng is not init yet

2026-05-24T21:52:58+00:00

We are using the getrandom syscall to get a random seed for the stack protector canary but we are calling it with no flags which means it'll block until there is some real randomness to return. This means that if the crng is not ready yet program startup will block and if you are unlucky that could be for a long time and look like the program has crashed. Even if the call to getrandom does not yield any random data, we will still initialize the canary. Fixes: 7188d4637e95 ("tools/nolibc: add support for stack protector") Signed-off-by: Daniel Palmer Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260522090726.726985-1-daniel@thingy.jp Signed-off-by: Thomas Weißschuh

tools/nolibc: getopt: Fix potential out of bounds access

2026-05-20T16:43:17+00:00

Running clang-tidy on a program that uses getopt() from nolibc this warning appears: getopt.h:80:6: warning: Out of bound access to memory after the end of the string literal [clang-analyzer-security.ArrayBound] 80 | if (optstring[i] == ':') { This looks like a very unlikely case that an argument inside of argv is being changed between getopt() calls. Adding a check for d becoming 0 in the guard after the loop stops getopt() getting far enough to access beyond the end of the array and seems to correct the issue. Fixes: bae3cd708e8a ("tools/nolibc: add getopt()") Assisted-by: Claude:claude-4.6-sonnet # reproducer Signed-off-by: Daniel Palmer Link: https://patch.msgid.link/20260520111931.1027758-1-daniel@thingy.jp [Thomas: clean up commit message a bit] Signed-off-by: Thomas Weißschuh

tools/nolibc: always pass mode to open syscall

2026-05-14T15:41:14+00:00

When O_TMPFILE is set, the open mode needs to be passed to the kernel as per the documentation. Currently this is not done. Instead of checking for O_TMPFILE explicitly and making the conditionals more complex, just always pass the mode to the kernel. If no value was passed the mode will be garbage, but the kernel will ignore it anyways. Fixes: a7604ba149e7 ("tools/nolibc/sys: make open() take a vararg on the 3rd argument") Suggested-by: Willy Tarreau Link: https://lore.kernel.org/lkml/afRfjdovT6pNtwtP@1wt.eu/ Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260514-nolibc-open-tmpfile-v2-3-b4c6c5efa266@weissschuh.net

tools/nolibc: split open mode handling into a macro

2026-05-14T15:41:09+00:00

This logic is duplicated and some upcoming extensions would require even more duplicated logic. Move it into a macro to avoid the duplication and allow cleaner changes. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260514-nolibc-open-tmpfile-v2-2-b4c6c5efa266@weissschuh.net

tools/nolibc: split implicit open flags into a macro

2026-05-14T15:41:02+00:00

This logic is duplicated and its current form will be in the way of some upcoming simplificiations. Move it into a macro to avoid the duplication and enable some cleanups. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260514-nolibc-open-tmpfile-v2-1-b4c6c5efa266@weissschuh.net

tools/nolibc: add support for 32-bit parisc

2026-05-03T14:39:54+00:00

Extend nolibc to target the 32-bit parisc architecture. 64-bit is not yet supported. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch/msgid.link/20260428-nolibc-hppa-v5-2-d843d573111a@weissschuh.net

tools/nolibc: add support for OpenRISC / or1k

2026-05-03T14:34:58+00:00

Add support for OpenRISC / or1k to nolibc. _start() uses the same wrapper construct as in arch-sh.h. libgcc is necessary as OpenRISC is missing 64-bit multiplication. Signed-off-by: Thomas Weißschuh Acked-by: Stafford Horne Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260429-nolibc-openrisc-v2-1-8d7d7a2f3fec@weissschuh.net