From 5febf432df1cfa5b25d99b54c32103fafbdd0eb9 Mon Sep 17 00:00:00 2001 From: Miguel Ojeda Date: Sun, 16 Aug 2026 15:32:33 +0200 Subject: kbuild: rust: keep Rust objects out of Clang LTO with inline helpers Under `CONFIG_LTO_CLANG` + `CONFIG_RUST_INLINE_HELPERS`, one may hit `objtool` errors such as: vmlinux.o: error: objtool: _R..._3Gsp4boot+0xd6a: can't find jump dest instruction at .text._R..._3Gsp4boot+0x1dfd The reason is that in such builds, the Clang invocation that compiles the combined Rust plus helpers bitcode emits LLVM bitcode (again) -- the final code generation happens in the linker's LTO step, which the `-mllvm` trap options passed to Clang do not reach. This, in turn, means that unreachable traps are missing, and the impossible paths do not merely fallthrough to the next symbol, but past the end of their own section, since LTO builds place each function in its own section. Thus filter `CC_FLAGS_LTO` out of the Clang invocation, so that it always emits machine code directly, with the traps in place. Assisted-by: LLM Cc: Gary Guo Cc: Boqun Feng Cc: Alice Ryhl Cc: Matthew Maurer Cc: Josh Poimboeuf Cc: Peter Zijlstra Cc: stable@vger.kernel.org Fixes: 3a2486cc1da5 ("kbuild: rust: provide an option to inline C helpers into Rust") Acked-by: Gary Guo Link: https://patch.msgid.link/20260816133233.197500-2-ojeda@kernel.org Signed-off-by: Miguel Ojeda --- fs/smb/client/netmisc.c | 212 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 212 insertions(+) create mode 100644 fs/smb/client/netmisc.c (limited to 'fs/smb/client/netmisc.c') diff --git a/fs/smb/client/netmisc.c b/fs/smb/client/netmisc.c new file mode 100644 index 000000000..bddadee82 --- /dev/null +++ b/fs/smb/client/netmisc.c @@ -0,0 +1,212 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * + * Copyright (c) International Business Machines Corp., 2002,2008 + * Author(s): Steve French (sfrench@us.ibm.com) + * + * Error mapping routines from Samba libsmb/errormap.c + * Copyright (C) Andrew Tridgell 2001 + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include "cifsfs.h" +#include "cifsglob.h" +#include "cifsproto.h" +#include "smb1proto.h" +#include "smberr.h" +#include "cifs_debug.h" +#include "nterr.h" + +/* + * Convert a string containing text IPv4 or IPv6 address to binary form. + * + * Returns 0 on failure. + */ +static int +cifs_inet_pton(const int address_family, const char *cp, int len, void *dst) +{ + int ret = 0; + + /* calculate length by finding first slash or NULL */ + if (address_family == AF_INET) + ret = in4_pton(cp, len, dst, '\\', NULL); + else if (address_family == AF_INET6) + ret = in6_pton(cp, len, dst , '\\', NULL); + + cifs_dbg(NOISY, "address conversion returned %d for %*.*s\n", + ret, len, len, cp); + if (ret > 0) + ret = 1; + return ret; +} + +/* + * Try to convert a string to an IPv4 address and then attempt to convert + * it to an IPv6 address if that fails. Set the family field if either + * succeeds. If it's an IPv6 address and it has a '%' sign in it, try to + * treat the part following it as a numeric sin6_scope_id. + * + * Returns 0 on failure. + */ +int +cifs_convert_address(struct sockaddr *dst, const char *src, int len) +{ + int rc, alen, slen; + const char *pct; + char scope_id[13]; + struct sockaddr_in *s4 = (struct sockaddr_in *) dst; + struct sockaddr_in6 *s6 = (struct sockaddr_in6 *) dst; + + /* IPv4 address */ + if (cifs_inet_pton(AF_INET, src, len, &s4->sin_addr.s_addr)) { + s4->sin_family = AF_INET; + return 1; + } + + /* attempt to exclude the scope ID from the address part */ + pct = memchr(src, '%', len); + alen = pct ? pct - src : len; + + rc = cifs_inet_pton(AF_INET6, src, alen, &s6->sin6_addr.s6_addr); + if (!rc) + return rc; + + s6->sin6_family = AF_INET6; + if (pct) { + /* grab the scope ID */ + slen = len - (alen + 1); + if (slen <= 0 || slen > 12) + return 0; + memcpy(scope_id, pct + 1, slen); + scope_id[slen] = '\0'; + + rc = kstrtouint(scope_id, 0, &s6->sin6_scope_id); + rc = (rc == 0) ? 1 : 0; + } + + return rc; +} + +void +cifs_set_port(struct sockaddr *addr, const unsigned short int port) +{ + switch (addr->sa_family) { + case AF_INET: + ((struct sockaddr_in *)addr)->sin_port = htons(port); + break; + case AF_INET6: + ((struct sockaddr_in6 *)addr)->sin6_port = htons(port); + break; + } +} + +/* The following are taken from fs/ntfs/util.c */ + +#define NTFS_TIME_OFFSET ((u64)(369*365 + 89) * 24 * 3600 * 10000000) + +/* + * Convert the NT UTC (based 1601-01-01, in hundred nanosecond units) + * into Unix UTC (based 1970-01-01, in seconds). + */ +struct timespec64 +cifs_NTtimeToUnix(__le64 ntutc) +{ + struct timespec64 ts; + /* BB what about the timezone? BB */ + + /* Subtract the NTFS time offset, then convert to 1s intervals. */ + s64 t = le64_to_cpu(ntutc) - NTFS_TIME_OFFSET; + u64 abs_t; + + /* + * Unfortunately can not use normal 64 bit division on 32 bit arch, but + * the alternative, do_div, does not work with negative numbers so have + * to special case them + */ + if (t < 0) { + abs_t = -t; + ts.tv_nsec = (time64_t)(do_div(abs_t, 10000000) * 100); + ts.tv_nsec = -ts.tv_nsec; + ts.tv_sec = -abs_t; + } else { + abs_t = t; + ts.tv_nsec = (time64_t)do_div(abs_t, 10000000) * 100; + ts.tv_sec = abs_t; + } + + return ts; +} + +/* Convert the Unix UTC into NT UTC. */ +u64 +cifs_UnixTimeToNT(struct timespec64 t) +{ + /* Convert to 100ns intervals and then add the NTFS time offset. */ + return (u64) t.tv_sec * 10000000 + t.tv_nsec/100 + NTFS_TIME_OFFSET; +} + +static const int total_days_of_prev_months[] = { + 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 +}; + +struct timespec64 cnvrtDosUnixTm(__le16 le_date, __le16 le_time, int offset) +{ + struct timespec64 ts; + time64_t sec, days; + int min, day, month, year; + u16 date = le16_to_cpu(le_date); + u16 time = le16_to_cpu(le_time); + SMB_TIME *st = (SMB_TIME *)&time; + SMB_DATE *sd = (SMB_DATE *)&date; + + cifs_dbg(FYI, "date %d time %d\n", date, time); + + sec = 2 * st->TwoSeconds; + min = st->Minutes; + if ((sec > 59) || (min > 59)) + cifs_dbg(VFS, "Invalid time min %d sec %lld\n", min, sec); + sec += (min * 60); + sec += 60 * 60 * st->Hours; + if (st->Hours > 24) + cifs_dbg(VFS, "Invalid hours %d\n", st->Hours); + day = sd->Day; + month = sd->Month; + if (day < 1 || day > 31 || month < 1 || month > 12) { + cifs_dbg(VFS, "Invalid date, month %d day: %d\n", month, day); + day = clamp(day, 1, 31); + month = clamp(month, 1, 12); + } + month -= 1; + days = day + total_days_of_prev_months[month]; + days += 3652; /* account for difference in days between 1980 and 1970 */ + year = sd->Year; + days += year * 365; + days += (year/4); /* leap year */ + /* generalized leap year calculation is more complex, ie no leap year + for years/100 except for years/400, but since the maximum number for DOS + year is 2**7, the last year is 1980+127, which means we need only + consider 2 special case years, ie the years 2000 and 2100, and only + adjust for the lack of leap year for the year 2100, as 2000 was a + leap year (divisible by 400) */ + if (year >= 120) /* the year 2100 */ + days = days - 1; /* do not count leap year for the year 2100 */ + + /* adjust for leap year where we are still before leap day */ + if (year != 120) + days -= ((year & 0x03) == 0) && (month < 2 ? 1 : 0); + sec += 24 * 60 * 60 * days; + + ts.tv_sec = sec + offset; + + /* cifs_dbg(FYI, "sec after cnvrt dos to unix time %d\n",sec); */ + + ts.tv_nsec = 0; + return ts; +} -- cgit v1.3.1