arm64: Mark kernel as tainted on SAE and SError panic

[ Upstream commit d7ce7e3a84642aadf7c4787f7ec4f58eb163d129 ]

Set TAINT_MACHINE_CHECK when SError or Synchronous External Abort (SEA)
interrupts trigger a panic to flag potential hardware faults. This
tainting mechanism aids in debugging and enables correlation of
hardware-related crashes in large-scale deployments.

This change aligns with similar patches[1] that mark machine check
events when the system crashes due to hardware errors.

Link: https://lore.kernel.org/all/20250702-add_tain-v1-1-9187b10914b9@debian.org/
Signed-off-by: Breno Leitao <leitao@debian.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20250716-vmcore_hw_error-v2-1-f187f7d62aba@debian.org
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index 23d281ed7621e4eae8f6772b323b2a5e578db53b..09489e92ff94503c2b884bc6e1330faa0f059f54 100644 (file)
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -911,6 +911,7 @@ void panic_bad_stack(struct pt_regs *regs, unsigned long esr, unsigned long far)
 
 void __noreturn arm64_serror_panic(struct pt_regs *regs, unsigned long esr)
 {
+       add_taint(TAINT_MACHINE_CHECK, LOCKDEP_STILL_OK);
        console_verbose();
 
        pr_crit("SError Interrupt on CPU%d, code 0x%016lx -- %s\n",

diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index 6b6b8a82f294123de14f92224e437f564bc3e4e4..0776c98ad27f1967c53f05301fc8dc1ae2c96701 100644 (file)
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -710,6 +710,7 @@ static int do_sea(unsigned long far, unsigned long esr, struct pt_regs *regs)
                 */
                siaddr  = untagged_addr(far);
        }
+       add_taint(TAINT_MACHINE_CHECK, LOCKDEP_STILL_OK);
        arm64_notify_die(inf->name, regs, inf->sig, inf->code, siaddr, esr);
 
        return 0;