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Message-Id: <20230124185110.143857-7-ebiggers@kernel.org>
Date: Tue, 24 Jan 2023 10:50:56 -0800
From: Eric Biggers <ebiggers@...nel.org>
To: stable@...r.kernel.org,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Kees Cook <keescook@...omium.org>, SeongJae Park <sj@...nel.org>,
Seth Jenkins <sethjenkins@...gle.com>,
Jann Horn <jannh@...gle.com>,
"Eric W . Biederman" <ebiederm@...ssion.com>,
linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 5.15 06/20] exit: Add and use make_task_dead.
From: "Eric W. Biederman" <ebiederm@...ssion.com>
commit 0e25498f8cd43c1b5aa327f373dd094e9a006da7 upstream.
There are two big uses of do_exit. The first is it's design use to be
the guts of the exit(2) system call. The second use is to terminate
a task after something catastrophic has happened like a NULL pointer
in kernel code.
Add a function make_task_dead that is initialy exactly the same as
do_exit to cover the cases where do_exit is called to handle
catastrophic failure. In time this can probably be reduced to just a
light wrapper around do_task_dead. For now keep it exactly the same so
that there will be no behavioral differences introducing this new
concept.
Replace all of the uses of do_exit that use it for catastraphic
task cleanup with make_task_dead to make it clear what the code
is doing.
As part of this rename rewind_stack_do_exit
rewind_stack_and_make_dead.
Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
Signed-off-by: Eric Biggers <ebiggers@...gle.com>
---
arch/alpha/kernel/traps.c | 6 +++---
arch/alpha/mm/fault.c | 2 +-
arch/arm/kernel/traps.c | 2 +-
arch/arm/mm/fault.c | 2 +-
arch/arm64/kernel/traps.c | 2 +-
arch/arm64/mm/fault.c | 2 +-
arch/csky/abiv1/alignment.c | 2 +-
arch/csky/kernel/traps.c | 2 +-
arch/csky/mm/fault.c | 2 +-
arch/h8300/kernel/traps.c | 2 +-
arch/h8300/mm/fault.c | 2 +-
arch/hexagon/kernel/traps.c | 2 +-
arch/ia64/kernel/mca_drv.c | 2 +-
arch/ia64/kernel/traps.c | 2 +-
arch/ia64/mm/fault.c | 2 +-
arch/m68k/kernel/traps.c | 2 +-
arch/m68k/mm/fault.c | 2 +-
arch/microblaze/kernel/exceptions.c | 4 ++--
arch/mips/kernel/traps.c | 2 +-
arch/nds32/kernel/fpu.c | 2 +-
arch/nds32/kernel/traps.c | 8 ++++----
arch/nios2/kernel/traps.c | 4 ++--
arch/openrisc/kernel/traps.c | 2 +-
arch/parisc/kernel/traps.c | 2 +-
arch/powerpc/kernel/traps.c | 8 ++++----
arch/riscv/kernel/traps.c | 2 +-
arch/riscv/mm/fault.c | 2 +-
arch/s390/kernel/dumpstack.c | 2 +-
arch/s390/kernel/nmi.c | 2 +-
arch/sh/kernel/traps.c | 2 +-
arch/sparc/kernel/traps_32.c | 4 +---
arch/sparc/kernel/traps_64.c | 4 +---
arch/x86/entry/entry_32.S | 6 +++---
arch/x86/entry/entry_64.S | 6 +++---
arch/x86/kernel/dumpstack.c | 4 ++--
arch/xtensa/kernel/traps.c | 2 +-
include/linux/sched/task.h | 1 +
kernel/exit.c | 9 +++++++++
tools/objtool/check.c | 3 ++-
39 files changed, 63 insertions(+), 56 deletions(-)
diff --git a/arch/alpha/kernel/traps.c b/arch/alpha/kernel/traps.c
index e805106409f76..f5ba12adde67c 100644
--- a/arch/alpha/kernel/traps.c
+++ b/arch/alpha/kernel/traps.c
@@ -192,7 +192,7 @@ die_if_kernel(char * str, struct pt_regs *regs, long err, unsigned long *r9_15)
local_irq_enable();
while (1);
}
- do_exit(SIGSEGV);
+ make_task_dead(SIGSEGV);
}
#ifndef CONFIG_MATHEMU
@@ -577,7 +577,7 @@ do_entUna(void * va, unsigned long opcode, unsigned long reg,
printk("Bad unaligned kernel access at %016lx: %p %lx %lu\n",
pc, va, opcode, reg);
- do_exit(SIGSEGV);
+ make_task_dead(SIGSEGV);
got_exception:
/* Ok, we caught the exception, but we don't want it. Is there
@@ -632,7 +632,7 @@ do_entUna(void * va, unsigned long opcode, unsigned long reg,
local_irq_enable();
while (1);
}
- do_exit(SIGSEGV);
+ make_task_dead(SIGSEGV);
}
/*
diff --git a/arch/alpha/mm/fault.c b/arch/alpha/mm/fault.c
index eee5102c3d889..e9193d52222ea 100644
--- a/arch/alpha/mm/fault.c
+++ b/arch/alpha/mm/fault.c
@@ -204,7 +204,7 @@ do_page_fault(unsigned long address, unsigned long mmcsr,
printk(KERN_ALERT "Unable to handle kernel paging request at "
"virtual address %016lx\n", address);
die_if_kernel("Oops", regs, cause, (unsigned long*)regs - 16);
- do_exit(SIGKILL);
+ make_task_dead(SIGKILL);
/* We ran out of memory, or some other thing happened to us that
made us unable to handle the page fault gracefully. */
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 54abd8720ddef..91e757bb054e6 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -334,7 +334,7 @@ static void oops_end(unsigned long flags, struct pt_regs *regs, int signr)
if (panic_on_oops)
panic("Fatal exception");
if (signr)
- do_exit(signr);
+ make_task_dead(signr);
}
/*
diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
index efa4020250315..af5177801fb10 100644
--- a/arch/arm/mm/fault.c
+++ b/arch/arm/mm/fault.c
@@ -125,7 +125,7 @@ __do_kernel_fault(struct mm_struct *mm, unsigned long addr, unsigned int fsr,
show_pte(KERN_ALERT, mm, addr);
die("Oops", regs, fsr);
bust_spinlocks(0);
- do_exit(SIGKILL);
+ make_task_dead(SIGKILL);
}
/*
diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index f859cc870d5b3..21e69a991bc83 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -235,7 +235,7 @@ void die(const char *str, struct pt_regs *regs, int err)
raw_spin_unlock_irqrestore(&die_lock, flags);
if (ret != NOTIFY_STOP)
- do_exit(SIGSEGV);
+ make_task_dead(SIGSEGV);
}
static void arm64_show_signal(int signo, const char *str)
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index d09b21faa0b23..97a93ee756a2e 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -302,7 +302,7 @@ static void die_kernel_fault(const char *msg, unsigned long addr,
show_pte(addr);
die("Oops", regs, esr);
bust_spinlocks(0);
- do_exit(SIGKILL);
+ make_task_dead(SIGKILL);
}
#ifdef CONFIG_KASAN_HW_TAGS
diff --git a/arch/csky/abiv1/alignment.c b/arch/csky/abiv1/alignment.c
index cb2a0d94a144d..5e2fb45d605cf 100644
--- a/arch/csky/abiv1/alignment.c
+++ b/arch/csky/abiv1/alignment.c
@@ -294,7 +294,7 @@ void csky_alignment(struct pt_regs *regs)
__func__, opcode, rz, rx, imm, addr);
show_regs(regs);
bust_spinlocks(0);
- do_exit(SIGKILL);
+ make_dead_task(SIGKILL);
}
force_sig_fault(SIGBUS, BUS_ADRALN, (void __user *)addr);
diff --git a/arch/csky/kernel/traps.c b/arch/csky/kernel/traps.c
index 2020af88b6361..b445c5aee220b 100644
--- a/arch/csky/kernel/traps.c
+++ b/arch/csky/kernel/traps.c
@@ -109,7 +109,7 @@ void die(struct pt_regs *regs, const char *str)
if (panic_on_oops)
panic("Fatal exception");
if (ret != NOTIFY_STOP)
- do_exit(SIGSEGV);
+ make_dead_task(SIGSEGV);
}
void do_trap(struct pt_regs *regs, int signo, int code, unsigned long addr)
diff --git a/arch/csky/mm/fault.c b/arch/csky/mm/fault.c
index 466ad949818a6..7215a46b6b8eb 100644
--- a/arch/csky/mm/fault.c
+++ b/arch/csky/mm/fault.c
@@ -67,7 +67,7 @@ static inline void no_context(struct pt_regs *regs, unsigned long addr)
pr_alert("Unable to handle kernel paging request at virtual "
"addr 0x%08lx, pc: 0x%08lx\n", addr, regs->pc);
die(regs, "Oops");
- do_exit(SIGKILL);
+ make_task_dead(SIGKILL);
}
static inline void mm_fault_error(struct pt_regs *regs, unsigned long addr, vm_fault_t fault)
diff --git a/arch/h8300/kernel/traps.c b/arch/h8300/kernel/traps.c
index bdbe988d8dbcf..3d4e0bde37ae7 100644
--- a/arch/h8300/kernel/traps.c
+++ b/arch/h8300/kernel/traps.c
@@ -106,7 +106,7 @@ void die(const char *str, struct pt_regs *fp, unsigned long err)
dump(fp);
spin_unlock_irq(&die_lock);
- do_exit(SIGSEGV);
+ make_dead_task(SIGSEGV);
}
static int kstack_depth_to_print = 24;
diff --git a/arch/h8300/mm/fault.c b/arch/h8300/mm/fault.c
index d4bc9c16f2df9..0223528565dd3 100644
--- a/arch/h8300/mm/fault.c
+++ b/arch/h8300/mm/fault.c
@@ -51,7 +51,7 @@ asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
printk(" at virtual address %08lx\n", address);
if (!user_mode(regs))
die("Oops", regs, error_code);
- do_exit(SIGKILL);
+ make_dead_task(SIGKILL);
return 1;
}
diff --git a/arch/hexagon/kernel/traps.c b/arch/hexagon/kernel/traps.c
index edfc35dafeb19..6dd6cf0ab711f 100644
--- a/arch/hexagon/kernel/traps.c
+++ b/arch/hexagon/kernel/traps.c
@@ -214,7 +214,7 @@ int die(const char *str, struct pt_regs *regs, long err)
panic("Fatal exception");
oops_exit();
- do_exit(err);
+ make_dead_task(err);
return 0;
}
diff --git a/arch/ia64/kernel/mca_drv.c b/arch/ia64/kernel/mca_drv.c
index 5bfc79be4cefe..23c203639a968 100644
--- a/arch/ia64/kernel/mca_drv.c
+++ b/arch/ia64/kernel/mca_drv.c
@@ -176,7 +176,7 @@ mca_handler_bh(unsigned long paddr, void *iip, unsigned long ipsr)
spin_unlock(&mca_bh_lock);
/* This process is about to be killed itself */
- do_exit(SIGKILL);
+ make_task_dead(SIGKILL);
}
/**
diff --git a/arch/ia64/kernel/traps.c b/arch/ia64/kernel/traps.c
index e13cb905930fb..753642366e12e 100644
--- a/arch/ia64/kernel/traps.c
+++ b/arch/ia64/kernel/traps.c
@@ -85,7 +85,7 @@ die (const char *str, struct pt_regs *regs, long err)
if (panic_on_oops)
panic("Fatal exception");
- do_exit(SIGSEGV);
+ make_task_dead(SIGSEGV);
return 0;
}
diff --git a/arch/ia64/mm/fault.c b/arch/ia64/mm/fault.c
index 02de2e70c5874..4796cccbf74f3 100644
--- a/arch/ia64/mm/fault.c
+++ b/arch/ia64/mm/fault.c
@@ -259,7 +259,7 @@ ia64_do_page_fault (unsigned long address, unsigned long isr, struct pt_regs *re
regs = NULL;
bust_spinlocks(0);
if (regs)
- do_exit(SIGKILL);
+ make_task_dead(SIGKILL);
return;
out_of_memory:
diff --git a/arch/m68k/kernel/traps.c b/arch/m68k/kernel/traps.c
index 34d6458340b0f..59fc63feb0dcc 100644
--- a/arch/m68k/kernel/traps.c
+++ b/arch/m68k/kernel/traps.c
@@ -1131,7 +1131,7 @@ void die_if_kernel (char *str, struct pt_regs *fp, int nr)
pr_crit("%s: %08x\n", str, nr);
show_registers(fp);
add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
- do_exit(SIGSEGV);
+ make_task_dead(SIGSEGV);
}
asmlinkage void set_esp0(unsigned long ssp)
diff --git a/arch/m68k/mm/fault.c b/arch/m68k/mm/fault.c
index ef46e77e97a5b..fcb3a0d8421c5 100644
--- a/arch/m68k/mm/fault.c
+++ b/arch/m68k/mm/fault.c
@@ -48,7 +48,7 @@ int send_fault_sig(struct pt_regs *regs)
pr_alert("Unable to handle kernel access");
pr_cont(" at virtual address %p\n", addr);
die_if_kernel("Oops", regs, 0 /*error_code*/);
- do_exit(SIGKILL);
+ make_task_dead(SIGKILL);
}
return 1;
diff --git a/arch/microblaze/kernel/exceptions.c b/arch/microblaze/kernel/exceptions.c
index 908788497b287..fd153d5fab982 100644
--- a/arch/microblaze/kernel/exceptions.c
+++ b/arch/microblaze/kernel/exceptions.c
@@ -44,10 +44,10 @@ void die(const char *str, struct pt_regs *fp, long err)
pr_warn("Oops: %s, sig: %ld\n", str, err);
show_regs(fp);
spin_unlock_irq(&die_lock);
- /* do_exit() should take care of panic'ing from an interrupt
+ /* make_task_dead() should take care of panic'ing from an interrupt
* context so we don't handle it here
*/
- do_exit(err);
+ make_task_dead(err);
}
/* for user application debugging */
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index edd93430b954a..afb2c955d99ef 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -416,7 +416,7 @@ void __noreturn die(const char *str, struct pt_regs *regs)
if (regs && kexec_should_crash(current))
crash_kexec(regs);
- do_exit(sig);
+ make_task_dead(sig);
}
extern struct exception_table_entry __start___dbe_table[];
diff --git a/arch/nds32/kernel/fpu.c b/arch/nds32/kernel/fpu.c
index 9edd7ed7d7bf8..701c09a668de4 100644
--- a/arch/nds32/kernel/fpu.c
+++ b/arch/nds32/kernel/fpu.c
@@ -223,7 +223,7 @@ inline void handle_fpu_exception(struct pt_regs *regs)
}
} else if (fpcsr & FPCSR_mskRIT) {
if (!user_mode(regs))
- do_exit(SIGILL);
+ make_task_dead(SIGILL);
si_signo = SIGILL;
}
diff --git a/arch/nds32/kernel/traps.c b/arch/nds32/kernel/traps.c
index f06421c645aff..b90030e8e546f 100644
--- a/arch/nds32/kernel/traps.c
+++ b/arch/nds32/kernel/traps.c
@@ -141,7 +141,7 @@ void die(const char *str, struct pt_regs *regs, int err)
bust_spinlocks(0);
spin_unlock_irq(&die_lock);
- do_exit(SIGSEGV);
+ make_task_dead(SIGSEGV);
}
EXPORT_SYMBOL(die);
@@ -240,7 +240,7 @@ void unhandled_interruption(struct pt_regs *regs)
pr_emerg("unhandled_interruption\n");
show_regs(regs);
if (!user_mode(regs))
- do_exit(SIGKILL);
+ make_task_dead(SIGKILL);
force_sig(SIGKILL);
}
@@ -251,7 +251,7 @@ void unhandled_exceptions(unsigned long entry, unsigned long addr,
addr, type);
show_regs(regs);
if (!user_mode(regs))
- do_exit(SIGKILL);
+ make_task_dead(SIGKILL);
force_sig(SIGKILL);
}
@@ -278,7 +278,7 @@ void do_revinsn(struct pt_regs *regs)
pr_emerg("Reserved Instruction\n");
show_regs(regs);
if (!user_mode(regs))
- do_exit(SIGILL);
+ make_task_dead(SIGILL);
force_sig(SIGILL);
}
diff --git a/arch/nios2/kernel/traps.c b/arch/nios2/kernel/traps.c
index 596986a74a26d..85ac49d64cf73 100644
--- a/arch/nios2/kernel/traps.c
+++ b/arch/nios2/kernel/traps.c
@@ -37,10 +37,10 @@ void die(const char *str, struct pt_regs *regs, long err)
show_regs(regs);
spin_unlock_irq(&die_lock);
/*
- * do_exit() should take care of panic'ing from an interrupt
+ * make_task_dead() should take care of panic'ing from an interrupt
* context so we don't handle it here
*/
- do_exit(err);
+ make_task_dead(err);
}
void _exception(int signo, struct pt_regs *regs, int code, unsigned long addr)
diff --git a/arch/openrisc/kernel/traps.c b/arch/openrisc/kernel/traps.c
index aa1e709405acd..9df1d85bfe1d1 100644
--- a/arch/openrisc/kernel/traps.c
+++ b/arch/openrisc/kernel/traps.c
@@ -212,7 +212,7 @@ void die(const char *str, struct pt_regs *regs, long err)
__asm__ __volatile__("l.nop 1");
do {} while (1);
#endif
- do_exit(SIGSEGV);
+ make_task_dead(SIGSEGV);
}
/* This is normally the 'Oops' routine */
diff --git a/arch/parisc/kernel/traps.c b/arch/parisc/kernel/traps.c
index 6fe5a3e98edc2..70ace36879507 100644
--- a/arch/parisc/kernel/traps.c
+++ b/arch/parisc/kernel/traps.c
@@ -268,7 +268,7 @@ void die_if_kernel(char *str, struct pt_regs *regs, long err)
panic("Fatal exception");
oops_exit();
- do_exit(SIGSEGV);
+ make_task_dead(SIGSEGV);
}
/* gdb uses break 4,8 */
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 11741703d26e0..a08bb7cefdc54 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -245,7 +245,7 @@ static void oops_end(unsigned long flags, struct pt_regs *regs,
if (panic_on_oops)
panic("Fatal exception");
- do_exit(signr);
+ make_task_dead(signr);
}
NOKPROBE_SYMBOL(oops_end);
@@ -792,9 +792,9 @@ int machine_check_generic(struct pt_regs *regs)
void die_mce(const char *str, struct pt_regs *regs, long err)
{
/*
- * The machine check wants to kill the interrupted context, but
- * do_exit() checks for in_interrupt() and panics in that case, so
- * exit the irq/nmi before calling die.
+ * The machine check wants to kill the interrupted context,
+ * but make_task_dead() checks for in_interrupt() and panics
+ * in that case, so exit the irq/nmi before calling die.
*/
if (in_nmi())
nmi_exit();
diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c
index 4102c97309cc2..6084bd93d2f58 100644
--- a/arch/riscv/kernel/traps.c
+++ b/arch/riscv/kernel/traps.c
@@ -59,7 +59,7 @@ void die(struct pt_regs *regs, const char *str)
if (panic_on_oops)
panic("Fatal exception");
if (ret != NOTIFY_STOP)
- do_exit(SIGSEGV);
+ make_task_dead(SIGSEGV);
}
void do_trap(struct pt_regs *regs, int signo, int code, unsigned long addr)
diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c
index 7cfaf366463fb..676a3f28811fa 100644
--- a/arch/riscv/mm/fault.c
+++ b/arch/riscv/mm/fault.c
@@ -31,7 +31,7 @@ static void die_kernel_fault(const char *msg, unsigned long addr,
bust_spinlocks(0);
die(regs, "Oops");
- do_exit(SIGKILL);
+ make_task_dead(SIGKILL);
}
static inline void no_context(struct pt_regs *regs, unsigned long addr)
diff --git a/arch/s390/kernel/dumpstack.c b/arch/s390/kernel/dumpstack.c
index db1bc00229caf..272ef8597e208 100644
--- a/arch/s390/kernel/dumpstack.c
+++ b/arch/s390/kernel/dumpstack.c
@@ -224,5 +224,5 @@ void die(struct pt_regs *regs, const char *str)
if (panic_on_oops)
panic("Fatal exception: panic_on_oops");
oops_exit();
- do_exit(SIGSEGV);
+ make_task_dead(SIGSEGV);
}
diff --git a/arch/s390/kernel/nmi.c b/arch/s390/kernel/nmi.c
index 383b4799b6dd3..d4f071e73a0a6 100644
--- a/arch/s390/kernel/nmi.c
+++ b/arch/s390/kernel/nmi.c
@@ -175,7 +175,7 @@ void __s390_handle_mcck(void)
"malfunction (code 0x%016lx).\n", mcck.mcck_code);
printk(KERN_EMERG "mcck: task: %s, pid: %d.\n",
current->comm, current->pid);
- do_exit(SIGSEGV);
+ make_task_dead(SIGSEGV);
}
}
diff --git a/arch/sh/kernel/traps.c b/arch/sh/kernel/traps.c
index e76b221570999..361b764700b74 100644
--- a/arch/sh/kernel/traps.c
+++ b/arch/sh/kernel/traps.c
@@ -57,7 +57,7 @@ void die(const char *str, struct pt_regs *regs, long err)
if (panic_on_oops)
panic("Fatal exception");
- do_exit(SIGSEGV);
+ make_task_dead(SIGSEGV);
}
void die_if_kernel(const char *str, struct pt_regs *regs, long err)
diff --git a/arch/sparc/kernel/traps_32.c b/arch/sparc/kernel/traps_32.c
index 5630e5a395e0d..179aabfa712ea 100644
--- a/arch/sparc/kernel/traps_32.c
+++ b/arch/sparc/kernel/traps_32.c
@@ -86,9 +86,7 @@ void __noreturn die_if_kernel(char *str, struct pt_regs *regs)
}
printk("Instruction DUMP:");
instruction_dump ((unsigned long *) regs->pc);
- if(regs->psr & PSR_PS)
- do_exit(SIGKILL);
- do_exit(SIGSEGV);
+ make_task_dead((regs->psr & PSR_PS) ? SIGKILL : SIGSEGV);
}
void do_hw_interrupt(struct pt_regs *regs, unsigned long type)
diff --git a/arch/sparc/kernel/traps_64.c b/arch/sparc/kernel/traps_64.c
index 6863025ed56d2..21077821f4272 100644
--- a/arch/sparc/kernel/traps_64.c
+++ b/arch/sparc/kernel/traps_64.c
@@ -2559,9 +2559,7 @@ void __noreturn die_if_kernel(char *str, struct pt_regs *regs)
}
if (panic_on_oops)
panic("Fatal exception");
- if (regs->tstate & TSTATE_PRIV)
- do_exit(SIGKILL);
- do_exit(SIGSEGV);
+ make_task_dead((regs->tstate & TSTATE_PRIV)? SIGKILL : SIGSEGV);
}
EXPORT_SYMBOL(die_if_kernel);
diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S
index 6b44263d7efbc..e309e71560389 100644
--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -1239,14 +1239,14 @@ SYM_CODE_START(asm_exc_nmi)
SYM_CODE_END(asm_exc_nmi)
.pushsection .text, "ax"
-SYM_CODE_START(rewind_stack_do_exit)
+SYM_CODE_START(rewind_stack_and_make_dead)
/* Prevent any naive code from trying to unwind to our caller. */
xorl %ebp, %ebp
movl PER_CPU_VAR(cpu_current_top_of_stack), %esi
leal -TOP_OF_KERNEL_STACK_PADDING-PTREGS_SIZE(%esi), %esp
- call do_exit
+ call make_task_dead
1: jmp 1b
-SYM_CODE_END(rewind_stack_do_exit)
+SYM_CODE_END(rewind_stack_and_make_dead)
.popsection
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index a3af2a9159b1b..9f1333a9ee41d 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -1487,7 +1487,7 @@ SYM_CODE_END(ignore_sysret)
#endif
.pushsection .text, "ax"
-SYM_CODE_START(rewind_stack_do_exit)
+SYM_CODE_START(rewind_stack_and_make_dead)
UNWIND_HINT_FUNC
/* Prevent any naive code from trying to unwind to our caller. */
xorl %ebp, %ebp
@@ -1496,6 +1496,6 @@ SYM_CODE_START(rewind_stack_do_exit)
leaq -PTREGS_SIZE(%rax), %rsp
UNWIND_HINT_REGS
- call do_exit
-SYM_CODE_END(rewind_stack_do_exit)
+ call make_task_dead
+SYM_CODE_END(rewind_stack_and_make_dead)
.popsection
diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
index ea4fe192189d5..53de044e56540 100644
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -351,7 +351,7 @@ unsigned long oops_begin(void)
}
NOKPROBE_SYMBOL(oops_begin);
-void __noreturn rewind_stack_do_exit(int signr);
+void __noreturn rewind_stack_and_make_dead(int signr);
void oops_end(unsigned long flags, struct pt_regs *regs, int signr)
{
@@ -386,7 +386,7 @@ void oops_end(unsigned long flags, struct pt_regs *regs, int signr)
* reuse the task stack and that existing poisons are invalid.
*/
kasan_unpoison_task_stack(current);
- rewind_stack_do_exit(signr);
+ rewind_stack_and_make_dead(signr);
}
NOKPROBE_SYMBOL(oops_end);
diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c
index 874b6efc6fb31..904086ad56827 100644
--- a/arch/xtensa/kernel/traps.c
+++ b/arch/xtensa/kernel/traps.c
@@ -552,5 +552,5 @@ void die(const char * str, struct pt_regs * regs, long err)
if (panic_on_oops)
panic("Fatal exception");
- do_exit(err);
+ make_task_dead(err);
}
diff --git a/include/linux/sched/task.h b/include/linux/sched/task.h
index caae8e045160d..d351f1b362ef9 100644
--- a/include/linux/sched/task.h
+++ b/include/linux/sched/task.h
@@ -59,6 +59,7 @@ extern void sched_post_fork(struct task_struct *p);
extern void sched_dead(struct task_struct *p);
void __noreturn do_task_dead(void);
+void __noreturn make_task_dead(int signr);
extern void proc_caches_init(void);
diff --git a/kernel/exit.c b/kernel/exit.c
index aefe7445508db..5d1a507fd4bae 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -877,6 +877,15 @@ void __noreturn do_exit(long code)
}
EXPORT_SYMBOL_GPL(do_exit);
+void __noreturn make_task_dead(int signr)
+{
+ /*
+ * Take the task off the cpu after something catastrophic has
+ * happened.
+ */
+ do_exit(signr);
+}
+
void complete_and_exit(struct completion *comp, long code)
{
if (comp)
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 308c8806ad94e..82ade76dcef2f 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -169,6 +169,7 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func,
"panic",
"do_exit",
"do_task_dead",
+ "make_task_dead",
"__module_put_and_exit",
"complete_and_exit",
"__reiserfs_panic",
@@ -176,7 +177,7 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func,
"fortify_panic",
"usercopy_abort",
"machine_real_restart",
- "rewind_stack_do_exit",
+ "rewind_stack_and_make_dead"
"kunit_try_catch_throw",
"xen_start_kernel",
"cpu_bringup_and_idle",
--
2.39.1
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