From 4617721c502b2ddaa4e324e86da4997edf738fa5 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Wed, 2 Sep 2026 09:55:01 -0400 Subject: ftrace: Synchronize the initialization of ftrace_ops There's some internal state that ftrace_ops needs to have set, but since it can be declared outside of the ftrace.c code, it calls ftrace_ops_init() on the ops in every global function. The issue is that if two tasks call it on the same ops at the same time it is possible to have the initialization of one corrupt the initialization of the other call. Create a ops_mutex to use to synchronize every initialization of the ftrace_ops. The mutex is taken within checking the ftrace_ops flag that states it was initializied but the flag is checked again after the mutex has been taken. Checking first outside the mutex allows it to shortcut having to take the mutex. But then the check needs to be done again after the mute is taken in case of races. Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock") Reported-by: sashiko-bot@kernel.org Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/ Signed-off-by: Steven Rostedt --- fs/hfs/trans.c | 150 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 150 insertions(+) create mode 100644 fs/hfs/trans.c (limited to 'fs/hfs/trans.c') diff --git a/fs/hfs/trans.c b/fs/hfs/trans.c new file mode 100644 index 000000000..fdb0edb8a --- /dev/null +++ b/fs/hfs/trans.c @@ -0,0 +1,150 @@ +/* + * linux/fs/hfs/trans.c + * + * Copyright (C) 1995-1997 Paul H. Hargrove + * This file may be distributed under the terms of the GNU General Public License. + * + * This file contains routines for converting between the Macintosh + * character set and various other encodings. This includes dealing + * with ':' vs. '/' as the path-element separator. + */ + +#include +#include + +#include "hfs_fs.h" + +/*================ Global functions ================*/ + +/* + * hfs_mac2asc() + * + * Given a 'Pascal String' (a string preceded by a length byte) in + * the Macintosh character set produce the corresponding filename using + * the 'trivial' name-mangling scheme, returning the length of the + * mangled filename. Note that the output string is not NULL + * terminated. + * + * The name-mangling works as follows: + * The character '/', which is illegal in Linux filenames is replaced + * by ':' which never appears in HFS filenames. All other characters + * are passed unchanged from input to output. + */ +int hfs_mac2asc(struct super_block *sb, char *out, const struct hfs_name *in) +{ + struct nls_table *nls_disk = HFS_SB(sb)->nls_disk; + struct nls_table *nls_io = HFS_SB(sb)->nls_io; + const char *src; + char *dst; + int srclen, dstlen, size; + + src = in->name; + srclen = in->len; + if (srclen > HFS_NAMELEN) + srclen = HFS_NAMELEN; + dst = out; + dstlen = HFS_MAX_NAMELEN; + if (nls_io) { + wchar_t ch; + + while (srclen > 0) { + if (nls_disk) { + size = nls_disk->char2uni(src, srclen, &ch); + if (size <= 0) { + ch = '?'; + size = 1; + } + src += size; + srclen -= size; + } else { + ch = *src++; + srclen--; + } + if (ch == '/') + ch = ':'; + size = nls_io->uni2char(ch, dst, dstlen); + if (size < 0) { + if (size == -ENAMETOOLONG) + goto out; + *dst = '?'; + size = 1; + } + dst += size; + dstlen -= size; + } + } else { + char ch; + + while (--srclen >= 0) + *dst++ = (ch = *src++) == '/' ? ':' : ch; + } +out: + return dst - out; +} + +/* + * hfs_asc2mac() + * + * Given an ASCII string (not null-terminated) and its length, + * generate the corresponding filename in the Macintosh character set + * using the 'trivial' name-mangling scheme, returning the length of + * the mangled filename. Note that the output string is not NULL + * terminated. + * + * This routine is a inverse to hfs_mac2triv(). + * A ':' is replaced by a '/'. + */ +void hfs_asc2mac(struct super_block *sb, struct hfs_name *out, const struct qstr *in) +{ + struct nls_table *nls_disk = HFS_SB(sb)->nls_disk; + struct nls_table *nls_io = HFS_SB(sb)->nls_io; + const char *src; + char *dst; + int srclen, dstlen, size; + + src = in->name; + srclen = in->len; + dst = out->name; + dstlen = HFS_NAMELEN; + if (nls_io) { + wchar_t ch; + + while (srclen > 0 && dstlen > 0) { + size = nls_io->char2uni(src, srclen, &ch); + if (size < 0) { + ch = '?'; + size = 1; + } + src += size; + srclen -= size; + if (ch == ':') + ch = '/'; + if (nls_disk) { + size = nls_disk->uni2char(ch, dst, dstlen); + if (size < 0) { + if (size == -ENAMETOOLONG) + goto out; + *dst = '?'; + size = 1; + } + dst += size; + dstlen -= size; + } else { + *dst++ = ch > 0xff ? '?' : ch; + dstlen--; + } + } + } else { + char ch; + + if (dstlen > srclen) + dstlen = srclen; + while (--dstlen >= 0) + *dst++ = (ch = *src++) == ':' ? '/' : ch; + } +out: + out->len = dst - (char *)out->name; + dstlen = HFS_NAMELEN - out->len; + while (--dstlen >= 0) + *dst++ = 0; +} -- cgit v1.3.1