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authorAl Viro <viro@zeniv.linux.org.uk>2023-01-30 23:47:28 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2023-03-02 12:32:27 -0500
commitd088af1e221c32bd67825c5dccf664f699e827b4 (patch)
treebe718bd73e7d461089e86dc50f08e63f9c029c9d /arch/ia64
parent79c54c97c7735e09f9e2193a713f30e56eec00dc (diff)
ia64: fix livelock in uaccess
ia64 equivalent of 26178ec11ef3 "x86: mm: consolidate VM_FAULT_RETRY handling" If e.g. get_user() triggers a page fault and a fatal signal is caught, we might end up with handle_mm_fault() returning VM_FAULT_RETRY and not doing anything to page tables. In such case we must *not* return to the faulting insn - that would repeat the entire thing without making any progress; what we need instead is to treat that as failed (user) memory access. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/ia64')
-rw-r--r--arch/ia64/mm/fault.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/ia64/mm/fault.c b/arch/ia64/mm/fault.c
index ef78c2d66cdd..85c4d9ac8686 100644
--- a/arch/ia64/mm/fault.c
+++ b/arch/ia64/mm/fault.c
@@ -136,8 +136,11 @@ retry:
*/
fault = handle_mm_fault(vma, address, flags, regs);
- if (fault_signal_pending(fault, regs))
+ if (fault_signal_pending(fault, regs)) {
+ if (!user_mode(regs))
+ goto no_context;
return;
+ }
/* The fault is fully completed (including releasing mmap lock) */
if (fault & VM_FAULT_COMPLETED)