cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mount_flags.c (1326B)

      1// SPDX-License-Identifier: LGPL-2.1
      2/*
      3 * trace/beauty/mount_flags.c
      4 *
      5 *  Copyright (C) 2018, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
      6 */
      7
      8#include "trace/beauty/beauty.h"
      9#include <linux/compiler.h>
     10#include <linux/kernel.h>
     11#include <linux/log2.h>
     12#include <sys/mount.h>
     13
     14static size_t mount__scnprintf_flags(unsigned long flags, char *bf, size_t size, bool show_prefix)
     15{
     16#include "trace/beauty/generated/mount_flags_array.c"
     17	static DEFINE_STRARRAY(mount_flags, "MS_");
     18
     19	return strarray__scnprintf_flags(&strarray__mount_flags, bf, size, show_prefix, flags);
     20}
     21
     22unsigned long syscall_arg__mask_val_mount_flags(struct syscall_arg *arg __maybe_unused, unsigned long flags)
     23{
     24	// do_mount in fs/namespace.c:
     25	/*
     26	 * Pre-0.97 versions of mount() didn't have a flags word.  When the
     27	 * flags word was introduced its top half was required to have the
     28	 * magic value 0xC0ED, and this remained so until 2.4.0-test9.
     29	 * Therefore, if this magic number is present, it carries no
     30	 * information and must be discarded.
     31	 */
     32	if ((flags & MS_MGC_MSK) == MS_MGC_VAL)
     33		flags &= ~MS_MGC_MSK;
     34
     35	return flags;
     36}
     37
     38size_t syscall_arg__scnprintf_mount_flags(char *bf, size_t size, struct syscall_arg *arg)
     39{
     40	unsigned long flags = arg->val;
     41
     42	return mount__scnprintf_flags(flags, bf, size, arg->show_string_prefix);
     43}