From 506ada89629ec7059b96ecfb0dc7d33ece0103ca Mon Sep 17 00:00:00 2001 From: Eduard Zingerman Date: Fri, 4 Sep 2026 17:05:56 -0700 Subject: bpf: mark a NULL kfunc argument precise check_kfunc_arg() allows bpf_register_is_null() for nullable arguments w/o marking the underlying scalar register precise. Hence a checkpoint created on such a path would prune against arbitrary scalar value. Fixes: 3bda08b63670 ("bpf: Allow NULL buffers in bpf_dynptr_slice(_rw)") Signed-off-by: Eduard Zingerman Link: https://lore.kernel.org/r/20260904-register-is-null-precise-fixes-v1-5-0f5a360ff15d@gmail.com Signed-off-by: Alexei Starovoitov --- fs/nls/nls_utf8.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 68 insertions(+) create mode 100644 fs/nls/nls_utf8.c (limited to 'fs/nls/nls_utf8.c') diff --git a/fs/nls/nls_utf8.c b/fs/nls/nls_utf8.c new file mode 100644 index 000000000..a0fa0610e --- /dev/null +++ b/fs/nls/nls_utf8.c @@ -0,0 +1,68 @@ +/* + * Module for handling utf8 just like any other charset. + * By Urban Widmark 2000 + */ + +#include +#include +#include +#include +#include + +static unsigned char identity[256]; + +static int uni2char(wchar_t uni, unsigned char *out, int boundlen) +{ + int n; + + if (boundlen <= 0) + return -ENAMETOOLONG; + + n = utf32_to_utf8(uni, out, boundlen); + if (n < 0) { + *out = '?'; + return -EINVAL; + } + return n; +} + +static int char2uni(const unsigned char *rawstring, int boundlen, wchar_t *uni) +{ + int n; + unicode_t u; + + n = utf8_to_utf32(rawstring, boundlen, &u); + if (n < 0 || u > MAX_WCHAR_T) { + *uni = 0x003f; /* ? */ + return -EINVAL; + } + *uni = (wchar_t) u; + return n; +} + +static struct nls_table table = { + .charset = "utf8", + .uni2char = uni2char, + .char2uni = char2uni, + .charset2lower = identity, /* no conversion */ + .charset2upper = identity, +}; + +static int __init init_nls_utf8(void) +{ + int i; + for (i=0; i<256; i++) + identity[i] = i; + + return register_nls(&table); +} + +static void __exit exit_nls_utf8(void) +{ + unregister_nls(&table); +} + +module_init(init_nls_utf8) +module_exit(exit_nls_utf8) +MODULE_DESCRIPTION("NLS UTF-8"); +MODULE_LICENSE("Dual BSD/GPL"); -- cgit v1.3.1