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Message-ID: <20231011100545.979577-4-ruanjinjie@huawei.com>
Date: Wed, 11 Oct 2023 10:05:33 +0000
From: Jinjie Ruan <ruanjinjie@...wei.com>
To: <catalin.marinas@....com>, <will@...nel.org>,
<yuzenghui@...wei.com>, <anshuman.khandual@....com>,
<gregkh@...uxfoundation.org>, <mark.rutland@....com>,
<broonie@...nel.org>, <youngmin.nam@...sung.com>,
<ardb@...nel.org>, <f.fainelli@...il.com>, <james.morse@....com>,
<sashal@...nel.org>, <scott@...amperecomputing.com>,
<ebiederm@...ssion.com>, <haibinzhang@...cent.com>,
<hewenliang4@...wei.com>, <linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <stable@...nel.org>
CC: <ruanjinjie@...wei.com>
Subject: [PATCH v5.10 RESEND 03/15] arm64: consistently pass ESR_ELx to die()
From: Mark Rutland <mark.rutland@....com>
commit 0f2cb928a1547ae8f89e80a4b8df2c6c02ae5f96 upstream.
Currently, bug_handler() and kasan_handler() call die() with '0' as the
'err' value, whereas die_kernel_fault() passes the ESR_ELx value.
For consistency, this patch ensures we always pass the ESR_ELx value to
die(). As this is only called for exceptions taken from kernel mode,
there should be no user-visible change as a result of this patch.
For UNDEFINED exceptions, I've had to modify do_undefinstr() and its
callers to pass the ESR_ELx value. In all cases the ESR_ELx value had
already been read and was available.
Signed-off-by: Mark Rutland <mark.rutland@....com>
Cc: Mark Brown <broonie@...nel.org>
Cc: Alexandru Elisei <alexandru.elisei@....com>
Cc: Amit Daniel Kachhap <amit.kachhap@....com>
Cc: James Morse <james.morse@....com>
Cc: Will Deacon <will@...nel.org>
Reviewed-by: Anshuman Khandual <anshuman.khandual@....com>
Reviewed-by: Mark Brown <broonie@...nel.org>
Link: https://lore.kernel.org/r/20220913101732.3925290-4-mark.rutland@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@....com>
Signed-off-by: Jinjie Ruan <ruanjinjie@...wei.com>
---
arch/arm64/include/asm/exception.h | 2 +-
arch/arm64/kernel/entry-common.c | 14 +++++++-------
arch/arm64/kernel/traps.c | 14 +++++++-------
3 files changed, 15 insertions(+), 15 deletions(-)
diff --git a/arch/arm64/include/asm/exception.h b/arch/arm64/include/asm/exception.h
index 59c3facb8a56..18f7a095b91e 100644
--- a/arch/arm64/include/asm/exception.h
+++ b/arch/arm64/include/asm/exception.h
@@ -33,7 +33,7 @@ asmlinkage void exit_to_user_mode(void);
void arm64_enter_nmi(struct pt_regs *regs);
void arm64_exit_nmi(struct pt_regs *regs);
void do_mem_abort(unsigned long addr, unsigned int esr, struct pt_regs *regs);
-void do_undefinstr(struct pt_regs *regs);
+void do_undefinstr(struct pt_regs *regs, unsigned long esr);
void do_bti(struct pt_regs *regs);
asmlinkage void bad_mode(struct pt_regs *regs, int reason, unsigned int esr);
void do_debug_exception(unsigned long addr_if_watchpoint, unsigned int esr,
diff --git a/arch/arm64/kernel/entry-common.c b/arch/arm64/kernel/entry-common.c
index ec120ed18faf..c1d6720ae397 100644
--- a/arch/arm64/kernel/entry-common.c
+++ b/arch/arm64/kernel/entry-common.c
@@ -132,11 +132,11 @@ static void noinstr el1_pc(struct pt_regs *regs, unsigned long esr)
exit_to_kernel_mode(regs);
}
-static void noinstr el1_undef(struct pt_regs *regs)
+static void noinstr el1_undef(struct pt_regs *regs, unsigned long esr)
{
enter_from_kernel_mode(regs);
local_daif_inherit(regs);
- do_undefinstr(regs);
+ do_undefinstr(regs, esr);
local_daif_mask();
exit_to_kernel_mode(regs);
}
@@ -210,7 +210,7 @@ asmlinkage void noinstr el1_sync_handler(struct pt_regs *regs)
break;
case ESR_ELx_EC_SYS64:
case ESR_ELx_EC_UNKNOWN:
- el1_undef(regs);
+ el1_undef(regs, esr);
break;
case ESR_ELx_EC_BREAKPT_CUR:
case ESR_ELx_EC_SOFTSTP_CUR:
@@ -316,11 +316,11 @@ static void noinstr el0_sp(struct pt_regs *regs, unsigned long esr)
do_sp_pc_abort(regs->sp, esr, regs);
}
-static void noinstr el0_undef(struct pt_regs *regs)
+static void noinstr el0_undef(struct pt_regs *regs, unsigned long esr)
{
enter_from_user_mode();
local_daif_restore(DAIF_PROCCTX);
- do_undefinstr(regs);
+ do_undefinstr(regs, esr);
}
static void noinstr el0_bti(struct pt_regs *regs)
@@ -394,7 +394,7 @@ asmlinkage void noinstr el0_sync_handler(struct pt_regs *regs)
el0_pc(regs, esr);
break;
case ESR_ELx_EC_UNKNOWN:
- el0_undef(regs);
+ el0_undef(regs, esr);
break;
case ESR_ELx_EC_BTI:
el0_bti(regs);
@@ -454,7 +454,7 @@ asmlinkage void noinstr el0_sync_compat_handler(struct pt_regs *regs)
case ESR_ELx_EC_CP14_MR:
case ESR_ELx_EC_CP14_LS:
case ESR_ELx_EC_CP14_64:
- el0_undef(regs);
+ el0_undef(regs, esr);
break;
case ESR_ELx_EC_CP15_32:
case ESR_ELx_EC_CP15_64:
diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index 3a88bb1202ad..2060ba0ee6b4 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -395,7 +395,7 @@ void arm64_notify_segfault(unsigned long addr)
force_signal_inject(SIGSEGV, code, addr, 0);
}
-void do_undefinstr(struct pt_regs *regs)
+void do_undefinstr(struct pt_regs *regs, unsigned long esr)
{
/* check for AArch32 breakpoint instructions */
if (!aarch32_break_handler(regs))
@@ -405,7 +405,7 @@ void do_undefinstr(struct pt_regs *regs)
return;
if (!user_mode(regs))
- die("Oops - Undefined instruction", regs, 0);
+ die("Oops - Undefined instruction", regs, esr);
force_signal_inject(SIGILL, ILL_ILLOPC, regs->pc, 0);
}
@@ -663,7 +663,7 @@ void do_cp15instr(unsigned int esr, struct pt_regs *regs)
hook_base = cp15_64_hooks;
break;
default:
- do_undefinstr(regs);
+ do_undefinstr(regs, esr);
return;
}
@@ -678,7 +678,7 @@ void do_cp15instr(unsigned int esr, struct pt_regs *regs)
* EL0. Fall back to our usual undefined instruction handler
* so that we handle these consistently.
*/
- do_undefinstr(regs);
+ do_undefinstr(regs, esr);
}
NOKPROBE_SYMBOL(do_cp15instr);
#endif
@@ -698,7 +698,7 @@ void do_sysinstr(unsigned int esr, struct pt_regs *regs)
* back to our usual undefined instruction handler so that we handle
* these consistently.
*/
- do_undefinstr(regs);
+ do_undefinstr(regs, esr);
}
NOKPROBE_SYMBOL(do_sysinstr);
@@ -901,7 +901,7 @@ static int bug_handler(struct pt_regs *regs, unsigned int esr)
{
switch (report_bug(regs->pc, regs)) {
case BUG_TRAP_TYPE_BUG:
- die("Oops - BUG", regs, 0);
+ die("Oops - BUG", regs, esr);
break;
case BUG_TRAP_TYPE_WARN:
@@ -969,7 +969,7 @@ static int kasan_handler(struct pt_regs *regs, unsigned int esr)
* This is something that might be fixed at some point in the future.
*/
if (!recover)
- die("Oops - KASAN", regs, 0);
+ die("Oops - KASAN", regs, esr);
/* If thread survives, skip over the brk instruction and continue: */
arm64_skip_faulting_instruction(regs, AARCH64_INSN_SIZE);
--
2.34.1
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