riscv/mm: Add handling for VM_FAULT_SIGSEGV in mm_fault_error()

[ Upstream commit 0c710050c47d45eb77b28c271cddefc5c785cb40 ]

Handle VM_FAULT_SIGSEGV in the page fault path so that we correctly
kill the process and we don't BUG() the kernel.

Fixes: 07037db5d479 ("RISC-V: Paging and MMU")
Signed-off-by: Zhe Qiao <qiaozhe@iscas.ac.cn>
Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Link: https://lore.kernel.org/r/20240731084547.85380-1-qiaozhe@iscas.ac.cn
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Zhe Qiao 2024-07-31 16:45:47 +08:00 committed by Ksawlii
parent 254636f1d3
commit 95a987699c

View file

@ -39,26 +39,27 @@ static inline void no_context(struct pt_regs *regs, unsigned long addr)
static inline void mm_fault_error(struct pt_regs *regs, unsigned long addr, vm_fault_t fault)
{
if (!user_mode(regs)) {
no_context(regs, addr);
return;
}
if (fault & VM_FAULT_OOM) {
/*
* We ran out of memory, call the OOM killer, and return the userspace
* (which will retry the fault, or kill us if we got oom-killed).
*/
if (!user_mode(regs)) {
no_context(regs, addr);
return;
}
pagefault_out_of_memory();
return;
} else if (fault & VM_FAULT_SIGBUS) {
/* Kernel mode? Handle exceptions or die */
if (!user_mode(regs)) {
no_context(regs, addr);
return;
}
do_trap(regs, SIGBUS, BUS_ADRERR, addr);
return;
} else if (fault & VM_FAULT_SIGSEGV) {
do_trap(regs, SIGSEGV, SEGV_MAPERR, addr);
return;
}
BUG();
}