From: Marco Elver <elver@google.com> mainline inclusion from mainline-v5.12-rc3 commit 0aa41cae92c1e2e61ae5b3a2dde8e674172e40ac category: bugfix bugzilla: 181005 https://gitee.com/openeuler/kernel/issues/I4EUY7 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... ----------------------------------------------- Some architectures prefix all functions with a constant string ('.' on ppc64). Add ARCH_FUNC_PREFIX, which may optionally be defined in <asm/kfence.h>, so that get_stack_skipnr() can work properly. Link: https://lkml.kernel.org/r/f036c53d-7e81-763c-47f4-6024c6c5f058@csgroup.eu Link: https://lkml.kernel.org/r/20210304144000.1148590-1-elver@google.com Signed-off-by: Marco Elver <elver@google.com> Reported-by: Christophe Leroy <christophe.leroy@csgroup.eu> Tested-by: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: Alexander Potapenko <glider@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Andrey Konovalov <andreyknvl@google.com> Cc: Jann Horn <jannh@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Peng Liu <liupeng256@huawei.com> Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com> Signed-off-by: Chen Jun <chenjun102@huawei.com> --- mm/kfence/report.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) diff --git a/mm/kfence/report.c b/mm/kfence/report.c index 519f037720f5..e3f71451ad9e 100644 --- a/mm/kfence/report.c +++ b/mm/kfence/report.c @@ -20,6 +20,11 @@ #include "kfence.h" +/* May be overridden by <asm/kfence.h>. */ +#ifndef ARCH_FUNC_PREFIX +#define ARCH_FUNC_PREFIX "" +#endif + extern bool no_hash_pointers; /* Helper function to either print to a seq_file or to console. */ @@ -67,8 +72,9 @@ static int get_stack_skipnr(const unsigned long stack_entries[], int num_entries for (skipnr = 0; skipnr < num_entries; skipnr++) { int len = scnprintf(buf, sizeof(buf), "%ps", (void *)stack_entries[skipnr]); - if (str_has_prefix(buf, "kfence_") || str_has_prefix(buf, "__kfence_") || - !strncmp(buf, "__slab_free", len)) { + if (str_has_prefix(buf, ARCH_FUNC_PREFIX "kfence_") || + str_has_prefix(buf, ARCH_FUNC_PREFIX "__kfence_") || + !strncmp(buf, ARCH_FUNC_PREFIX "__slab_free", len)) { /* * In case of tail calls from any of the below * to any of the above. @@ -77,10 +83,10 @@ static int get_stack_skipnr(const unsigned long stack_entries[], int num_entries } /* Also the *_bulk() variants by only checking prefixes. */ - if (str_has_prefix(buf, "kfree") || - str_has_prefix(buf, "kmem_cache_free") || - str_has_prefix(buf, "__kmalloc") || - str_has_prefix(buf, "kmem_cache_alloc")) + if (str_has_prefix(buf, ARCH_FUNC_PREFIX "kfree") || + str_has_prefix(buf, ARCH_FUNC_PREFIX "kmem_cache_free") || + str_has_prefix(buf, ARCH_FUNC_PREFIX "__kmalloc") || + str_has_prefix(buf, ARCH_FUNC_PREFIX "kmem_cache_alloc")) goto found; } if (fallback < num_entries) -- 2.20.1