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Message-ID: <20230112195541.906007455@infradead.org>
Date: Thu, 12 Jan 2023 20:43:56 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: peterz@...radead.org
Cc: richard.henderson@...aro.org, ink@...assic.park.msu.ru,
mattst88@...il.com, vgupta@...nel.org, linux@...linux.org.uk,
nsekhar@...com, brgl@...ev.pl, ulli.kroll@...glemail.com,
linus.walleij@...aro.org, shawnguo@...nel.org,
Sascha Hauer <s.hauer@...gutronix.de>, kernel@...gutronix.de,
festevam@...il.com, linux-imx@....com, tony@...mide.com,
khilman@...nel.org, krzysztof.kozlowski@...aro.org,
alim.akhtar@...sung.com, catalin.marinas@....com, will@...nel.org,
guoren@...nel.org, bcain@...cinc.com, chenhuacai@...nel.org,
kernel@...0n.name, geert@...ux-m68k.org, sammy@...my.net,
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"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH v3 42/51] ubsan: Fix objtool UACCESS warns
clang-14 allyesconfig gives:
vmlinux.o: warning: objtool: emulator_cmpxchg_emulated+0x705: call to __ubsan_handle_load_invalid_value() with UACCESS enabled
vmlinux.o: warning: objtool: paging64_update_accessed_dirty_bits+0x39e: call to __ubsan_handle_load_invalid_value() with UACCESS enabled
vmlinux.o: warning: objtool: paging32_update_accessed_dirty_bits+0x390: call to __ubsan_handle_load_invalid_value() with UACCESS enabled
vmlinux.o: warning: objtool: ept_update_accessed_dirty_bits+0x43f: call to __ubsan_handle_load_invalid_value() with UACCESS enabled
Add the required eflags save/restore and whitelist the thing.
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Acked-by: Frederic Weisbecker <frederic@...nel.org>
Tested-by: Tony Lindgren <tony@...mide.com>
Tested-by: Ulf Hansson <ulf.hansson@...aro.org>
---
lib/ubsan.c | 5 ++++-
tools/objtool/check.c | 1 +
2 files changed, 5 insertions(+), 1 deletion(-)
--- a/lib/ubsan.c
+++ b/lib/ubsan.c
@@ -340,9 +340,10 @@ void __ubsan_handle_load_invalid_value(v
{
struct invalid_value_data *data = _data;
char val_str[VALUE_LENGTH];
+ unsigned long ua_flags = user_access_save();
if (suppress_report(&data->location))
- return;
+ goto out;
ubsan_prologue(&data->location, "invalid-load");
@@ -352,6 +353,8 @@ void __ubsan_handle_load_invalid_value(v
val_str, data->type->type_name);
ubsan_epilogue();
+out:
+ user_access_restore(ua_flags);
}
EXPORT_SYMBOL(__ubsan_handle_load_invalid_value);
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -1068,6 +1068,7 @@ static const char *uaccess_safe_builtin[
"__ubsan_handle_type_mismatch",
"__ubsan_handle_type_mismatch_v1",
"__ubsan_handle_shift_out_of_bounds",
+ "__ubsan_handle_load_invalid_value",
/* misc */
"csum_partial_copy_generic",
"copy_mc_fragile",
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