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![Andrey Ryabinin](/assets/img/avatar_default.png)
UBSAN uses compile-time instrumentation to catch undefined behavior (UB). Compiler inserts code that perform certain kinds of checks before operations that could cause UB. If check fails (i.e. UB detected) __ubsan_handle_* function called to print error message. So the most of the work is done by compiler. This patch just implements ubsan handlers printing errors. GCC has this capability since 4.9.x [1] (see -fsanitize=undefined option and its suboptions). However GCC 5.x has more checkers implemented [2]. Article [3] has a bit more details about UBSAN in the GCC. [1] - https://gcc.gnu.org/onlinedocs/gcc-4.9.0/gcc/Debugging-Options.html [2] - https://gcc.gnu.org/onlinedocs/gcc/Debugging-Options.html [3] - http://developerblog.redhat.com/2014/10/16/gcc-undefined-behavior-sanitizer-ubsan/ Issues which UBSAN has found thus far are: Found bugs: * out-of-bounds access -97840cb67f
("netfilter: nfnetlink: fix insufficient validation in nfnetlink_bind") undefined shifts: *d48458d4a7
("jbd2: use a better hash function for the revoke table") *10632008b9
("clockevents: Prevent shift out of bounds") * 'x << -1' shift in ext4 - http://lkml.kernel.org/r/<5444EF21.8020501@samsung.com> * undefined rol32(0) - http://lkml.kernel.org/r/<1449198241-20654-1-git-send-email-sasha.levin@oracle.com> * undefined dirty_ratelimit calculation - http://lkml.kernel.org/r/<566594E2.3050306@odin.com> * undefined roundown_pow_of_two(0) - http://lkml.kernel.org/r/<1449156616-11474-1-git-send-email-sasha.levin@oracle.com> * [WONTFIX] undefined shift in __bpf_prog_run - http://lkml.kernel.org/r/<CACT4Y+ZxoR3UjLgcNdUm4fECLMx2VdtfrENMtRRCdgHB2n0bJA@mail.gmail.com> WONTFIX here because it should be fixed in bpf program, not in kernel. signed overflows: *32a8df4e0b
("sched: Fix odd values in effective_load() calculations") * mul overflow in ntp - http://lkml.kernel.org/r/<1449175608-1146-1-git-send-email-sasha.levin@oracle.com> * incorrect conversion into rtc_time in rtc_time64_to_tm() - http://lkml.kernel.org/r/<1449187944-11730-1-git-send-email-sasha.levin@oracle.com> * unvalidated timespec in io_getevents() - http://lkml.kernel.org/r/<CACT4Y+bBxVYLQ6LtOKrKtnLthqLHcw-BMp3aqP3mjdAvr9FULQ@mail.gmail.com> * [NOTABUG] signed overflow in ktime_add_safe() - http://lkml.kernel.org/r/<CACT4Y+aJ4muRnWxsUe1CMnA6P8nooO33kwG-c8YZg=0Xc8rJqw@mail.gmail.com> [akpm@linux-foundation.org: fix unused local warning] [akpm@linux-foundation.org: fix __int128 build woes] Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sasha Levin <sasha.levin@oracle.com> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Michal Marek <mmarek@suse.cz> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Yury Gribov <y.gribov@samsung.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kostya Serebryany <kcc@google.com> Cc: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
84 lines
1.5 KiB
C
84 lines
1.5 KiB
C
#ifndef _LIB_UBSAN_H
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#define _LIB_UBSAN_H
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enum {
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type_kind_int = 0,
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type_kind_float = 1,
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type_unknown = 0xffff
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};
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struct type_descriptor {
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u16 type_kind;
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u16 type_info;
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char type_name[1];
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};
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struct source_location {
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const char *file_name;
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union {
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unsigned long reported;
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struct {
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u32 line;
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u32 column;
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};
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};
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};
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struct overflow_data {
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struct source_location location;
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struct type_descriptor *type;
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};
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struct type_mismatch_data {
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struct source_location location;
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struct type_descriptor *type;
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unsigned long alignment;
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unsigned char type_check_kind;
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};
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struct nonnull_arg_data {
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struct source_location location;
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struct source_location attr_location;
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int arg_index;
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};
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struct nonnull_return_data {
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struct source_location location;
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struct source_location attr_location;
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};
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struct vla_bound_data {
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struct source_location location;
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struct type_descriptor *type;
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};
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struct out_of_bounds_data {
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struct source_location location;
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struct type_descriptor *array_type;
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struct type_descriptor *index_type;
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};
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struct shift_out_of_bounds_data {
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struct source_location location;
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struct type_descriptor *lhs_type;
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struct type_descriptor *rhs_type;
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};
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struct unreachable_data {
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struct source_location location;
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};
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struct invalid_value_data {
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struct source_location location;
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struct type_descriptor *type;
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};
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#if defined(CONFIG_ARCH_SUPPORTS_INT128) && defined(__SIZEOF_INT128__)
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typedef __int128 s_max;
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typedef unsigned __int128 u_max;
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#else
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typedef s64 s_max;
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typedef u64 u_max;
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#endif
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#endif
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