/* * System call table mapper * * (C) 2016 Arnaldo Carvalho de Melo * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. */ #include "syscalltbl.h" #include #ifdef HAVE_SYSCALL_TABLE #include #include #include "util.h" #if defined(__x86_64__) #include const int syscalltbl_native_max_id = SYSCALLTBL_x86_64_MAX_ID; static const char **syscalltbl_native = syscalltbl_x86_64; #endif struct syscall { int id; const char *name; }; static int syscallcmpname(const void *vkey, const void *ventry) { const char *key = vkey; const struct syscall *entry = ventry; return strcmp(key, entry->name); } static int syscallcmp(const void *va, const void *vb) { const struct syscall *a = va, *b = vb; return strcmp(a->name, b->name); } static int syscalltbl__init_native(struct syscalltbl *tbl) { int nr_entries = 0, i, j; struct syscall *entries; for (i = 0; i <= syscalltbl_native_max_id; ++i) if (syscalltbl_native[i]) ++nr_entries; entries = tbl->syscalls.entries = malloc(sizeof(struct syscall) * nr_entries); if (tbl->syscalls.entries == NULL) return -1; for (i = 0, j = 0; i <= syscalltbl_native_max_id; ++i) { if (syscalltbl_native[i]) { entries[j].name = syscalltbl_native[i]; entries[j].id = i; ++j; } } qsort(tbl->syscalls.entries, nr_entries, sizeof(struct syscall), syscallcmp); tbl->syscalls.nr_entries = nr_entries; return 0; } struct syscalltbl *syscalltbl__new(void) { struct syscalltbl *tbl = malloc(sizeof(*tbl)); if (tbl) { if (syscalltbl__init_native(tbl)) { free(tbl); return NULL; } } return tbl; } void syscalltbl__delete(struct syscalltbl *tbl) { zfree(&tbl->syscalls.entries); free(tbl); } const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id) { return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL; } int syscalltbl__id(struct syscalltbl *tbl, const char *name) { struct syscall *sc = bsearch(name, tbl->syscalls.entries, tbl->syscalls.nr_entries, sizeof(*sc), syscallcmpname); return sc ? sc->id : -1; } #else /* HAVE_SYSCALL_TABLE */ #include struct syscalltbl *syscalltbl__new(void) { struct syscalltbl *tbl = malloc(sizeof(*tbl)); if (tbl) tbl->audit_machine = audit_detect_machine(); return tbl; } void syscalltbl__delete(struct syscalltbl *tbl) { free(tbl); } const char *syscalltbl__name(const struct syscalltbl *tbl, int id) { return audit_syscall_to_name(id, tbl->audit_machine); } int syscalltbl__id(struct syscalltbl *tbl, const char *name) { return audit_name_to_syscall(name, tbl->audit_machine); } #endif /* HAVE_SYSCALL_TABLE */ class='content'>
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authorThomas Gleixner <tglx@linutronix.de>2017-01-31 09:37:34 +0100
committerThomas Gleixner <tglx@linutronix.de>2017-01-31 21:47:58 +0100
commit0becc0ae5b42828785b589f686725ff5bc3b9b25 (patch)
treebe6d0e1f37c38ed0a7dd5da2d4b1e93f0fb43101 /net/ipv4/ip_tunnel.c
parent24c2503255d35c269b67162c397a1a1c1e02f6ce (diff)
x86/mce: Make timer handling more robust
Erik reported that on a preproduction hardware a CMCI storm triggers the BUG_ON in add_timer_on(). The reason is that the per CPU MCE timer is started by the CMCI logic before the MCE CPU hotplug callback starts the timer with add_timer_on(). So the timer is already queued which triggers the BUG. Using add_timer_on() is pretty pointless in this code because the timer is strictlty per CPU, initialized as pinned and all operations which arm the timer happen on the CPU to which the timer belongs. Simplify the whole machinery by using mod_timer() instead of add_timer_on() which avoids the problem because mod_timer() can handle already queued timers. Use __start_timer() everywhere so the earliest armed expiry time is preserved. Reported-by: Erik Veijola <erik.veijola@intel.com> Tested-by: Borislav Petkov <bp@alien8.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Borislav Petkov <bp@alien8.de> Cc: Tony Luck <tony.luck@intel.com> Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1701310936080.3457@nanos Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'net/ipv4/ip_tunnel.c')