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kasan: remove PG_skip_kasan_poison flag

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Code inspection reveals that PG_skip_kasan_poison is redundant with
kasantag, because the former is intended to be set iff the latter is the
match-all tag.  It can also be observed that it's basically pointless to
poison pages which have kasantag=0, because any pages with this tag would
have been pointed to by pointers with match-all tags, so poisoning the
pages would have little to no effect in terms of bug detection. 
Therefore, change the condition in should_skip_kasan_poison() to check
kasantag instead, and remove PG_skip_kasan_poison and associated flags.

Link: https://lkml.kernel.org/r/20230310042914.3805818-3-pcc@google.com
Link: https://linux-review.googlesource.com/id/I57f825f2eaeaf7e8389d6cf4597c8a5821359838
Signed-off-by: Peter Collingbourne <pcc@google.com>
Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Peter Collingbourne
2023-03-09 20:29:14 -08:00
committed by Andrew Morton
parent 7eb16f23b9
commit 0a54864f8d
6 changed files with 47 additions and 90 deletions
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13
include/trace/events/mmflags.h
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@@ -55,8 +55,7 @@
#ifdef CONFIG_KASAN_HW_TAGS
#define __def_gfpflag_names_kasan , \
gfpflag_string(__GFP_SKIP_ZERO), \
gfpflag_string(__GFP_SKIP_KASAN_POISON), \
gfpflag_string(__GFP_SKIP_KASAN_UNPOISON)
gfpflag_string(__GFP_SKIP_KASAN)
#else
#define __def_gfpflag_names_kasan
#endif
@@ -96,13 +95,6 @@
#define IF_HAVE_PG_ARCH_X(_name)
#endif
#ifdef CONFIG_KASAN_HW_TAGS
#define IF_HAVE_PG_SKIP_KASAN_POISON(_name) \
,{1UL << PG_##_name, __stringify(_name)}
#else
#define IF_HAVE_PG_SKIP_KASAN_POISON(_name)
#endif
#define DEF_PAGEFLAG_NAME(_name) { 1UL << PG_##_name, __stringify(_name) }
#define __def_pageflag_names \
@@ -133,8 +125,7 @@ IF_HAVE_PG_HWPOISON(hwpoison) \
IF_HAVE_PG_IDLE(idle) \
IF_HAVE_PG_IDLE(young) \
IF_HAVE_PG_ARCH_X(arch_2) \
IF_HAVE_PG_ARCH_X(arch_3) \
IF_HAVE_PG_SKIP_KASAN_POISON(skip_kasan_poison)
IF_HAVE_PG_ARCH_X(arch_3)
#define show_page_flags(flags) \
(flags) ? __print_flags(flags, "|", \