diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig.debug | 10 | ||||
| -rw-r--r-- | lib/iov_iter.c | 48 | ||||
| -rw-r--r-- | lib/maple_tree.c | 1 | ||||
| -rw-r--r-- | lib/stackdepot.c | 12 | ||||
| -rw-r--r-- | lib/test_printf.c | 26 | ||||
| -rw-r--r-- | lib/vsprintf.c | 21 |
6 files changed, 118 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 39d1d93164bd..5cd8183bb4c1 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -791,6 +791,16 @@ config DEBUG_VM If unsure, say N. +config DEBUG_VM_SHOOT_LAZIES + bool "Debug MMU_LAZY_TLB_SHOOTDOWN implementation" + depends on DEBUG_VM + depends on MMU_LAZY_TLB_SHOOTDOWN + help + Enable additional IPIs that ensure lazy tlb mm references are removed + before the mm is freed. + + If unsure, say N. + config DEBUG_VM_MAPLE_TREE bool "Debug VM maple trees" depends on DEBUG_VM diff --git a/lib/iov_iter.c b/lib/iov_iter.c index 274014e4eafe..34dd6bdf2fba 100644 --- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -172,6 +172,18 @@ static int copyout(void __user *to, const void *from, size_t n) return n; } +static int copyout_nofault(void __user *to, const void *from, size_t n) +{ + long res; + + if (should_fail_usercopy()) + return n; + + res = copy_to_user_nofault(to, from, n); + + return res < 0 ? n : res; +} + static int copyin(void *to, const void __user *from, size_t n) { size_t res = n; @@ -734,6 +746,42 @@ size_t copy_page_to_iter(struct page *page, size_t offset, size_t bytes, } EXPORT_SYMBOL(copy_page_to_iter); +size_t copy_page_to_iter_nofault(struct page *page, unsigned offset, size_t bytes, + struct iov_iter *i) +{ + size_t res = 0; + + if (!page_copy_sane(page, offset, bytes)) + return 0; + if (WARN_ON_ONCE(i->data_source)) + return 0; + if (unlikely(iov_iter_is_pipe(i))) + return copy_page_to_iter_pipe(page, offset, bytes, i); + page += offset / PAGE_SIZE; // first subpage + offset %= PAGE_SIZE; + while (1) { + void *kaddr = kmap_local_page(page); + size_t n = min(bytes, (size_t)PAGE_SIZE - offset); + + iterate_and_advance(i, n, base, len, off, + copyout_nofault(base, kaddr + offset + off, len), + memcpy(base, kaddr + offset + off, len) + ) + kunmap_local(kaddr); + res += n; + bytes -= n; + if (!bytes || !n) + break; + offset += n; + if (offset == PAGE_SIZE) { + page++; + offset = 0; + } + } + return res; +} +EXPORT_SYMBOL(copy_page_to_iter_nofault); + size_t copy_page_from_iter(struct page *page, size_t offset, size_t bytes, struct iov_iter *i) { diff --git a/lib/maple_tree.c b/lib/maple_tree.c index 7ff2a821a2a1..5577e6da6fe3 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -5814,6 +5814,7 @@ int mas_preallocate(struct ma_state *mas, gfp_t gfp) mas_reset(mas); return ret; } +EXPORT_SYMBOL_GPL(mas_preallocate); /* * mas_destroy() - destroy a maple state. diff --git a/lib/stackdepot.c b/lib/stackdepot.c index 036da8e295d1..2f5aa851834e 100644 --- a/lib/stackdepot.c +++ b/lib/stackdepot.c @@ -17,6 +17,7 @@ #include <linux/gfp.h> #include <linux/jhash.h> #include <linux/kernel.h> +#include <linux/kmsan.h> #include <linux/mm.h> #include <linux/mutex.h> #include <linux/percpu.h> @@ -306,6 +307,11 @@ depot_alloc_stack(unsigned long *entries, int size, u32 hash, void **prealloc) stack->handle.extra = 0; memcpy(stack->entries, entries, flex_array_size(stack, entries, size)); pool_offset += required_size; + /* + * Let KMSAN know the stored stack record is initialized. This shall + * prevent false positive reports if instrumented code accesses it. + */ + kmsan_unpoison_memory(stack, required_size); return stack; } @@ -465,6 +471,12 @@ unsigned int stack_depot_fetch(depot_stack_handle_t handle, struct stack_record *stack; *entries = NULL; + /* + * Let KMSAN know *entries is initialized. This shall prevent false + * positive reports if instrumented code accesses it. + */ + kmsan_unpoison_memory(entries, sizeof(*entries)); + if (!handle) return 0; diff --git a/lib/test_printf.c b/lib/test_printf.c index 46b4e6c414a3..7677ebccf3c3 100644 --- a/lib/test_printf.c +++ b/lib/test_printf.c @@ -642,12 +642,26 @@ page_flags_test(int section, int node, int zone, int last_cpupid, test(cmp_buf, "%pGp", &flags); } +static void __init page_type_test(unsigned int page_type, const char *name, + char *cmp_buf) +{ + unsigned long size; + + size = scnprintf(cmp_buf, BUF_SIZE, "%#x(", page_type); + if (page_type_has_type(page_type)) + size += scnprintf(cmp_buf + size, BUF_SIZE - size, "%s", name); + + snprintf(cmp_buf + size, BUF_SIZE - size, ")"); + test(cmp_buf, "%pGt", &page_type); +} + static void __init flags(void) { unsigned long flags; char *cmp_buffer; gfp_t gfp; + unsigned int page_type; cmp_buffer = kmalloc(BUF_SIZE, GFP_KERNEL); if (!cmp_buffer) @@ -687,6 +701,18 @@ flags(void) gfp |= __GFP_HIGH; test(cmp_buffer, "%pGg", &gfp); + page_type = ~0; + page_type_test(page_type, "", cmp_buffer); + + page_type = 10; + page_type_test(page_type, "", cmp_buffer); + + page_type = ~PG_buddy; + page_type_test(page_type, "buddy", cmp_buffer); + + page_type = ~(PG_table | PG_buddy); + page_type_test(page_type, "table|buddy", cmp_buffer); + kfree(cmp_buffer); } diff --git a/lib/vsprintf.c b/lib/vsprintf.c index be71a03c936a..fbe320b5e89f 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -2052,6 +2052,25 @@ char *format_page_flags(char *buf, char *end, unsigned long flags) return buf; } +static +char *format_page_type(char *buf, char *end, unsigned int page_type) +{ + buf = number(buf, end, page_type, default_flag_spec); + + if (buf < end) + *buf = '('; + buf++; + + if (page_type_has_type(page_type)) + buf = format_flags(buf, end, ~page_type, pagetype_names); + + if (buf < end) + *buf = ')'; + buf++; + + return buf; +} + static noinline_for_stack char *flags_string(char *buf, char *end, void *flags_ptr, struct printf_spec spec, const char *fmt) @@ -2065,6 +2084,8 @@ char *flags_string(char *buf, char *end, void *flags_ptr, switch (fmt[1]) { case 'p': return format_page_flags(buf, end, *(unsigned long *)flags_ptr); + case 't': + return format_page_type(buf, end, *(unsigned int *)flags_ptr); case 'v': flags = *(unsigned long *)flags_ptr; names = vmaflag_names; |