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Message-ID: <166855118326.4906.13329103756426094268.tip-bot2@tip-bot2>
Date: Tue, 15 Nov 2022 22:26:23 -0000
From: "tip-bot2 for Sean Christopherson" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: syzbot+ffb4f000dc2872c93f62@...kaller.appspotmail.com,
Andrey Ryabinin <ryabinin.a.a@...il.com>,
Sean Christopherson <seanjc@...gle.com>,
"Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
linux-kernel@...r.kernel.org
Subject: [tip: x86/mm] x86/mm: Populate KASAN shadow for entire per-CPU range
of CPU entry area
The following commit has been merged into the x86/mm branch of tip:
Commit-ID: 4917fc63dc646d6346f5d67ce8c10df874a6f4fe
Gitweb: https://git.kernel.org/tip/4917fc63dc646d6346f5d67ce8c10df874a6f4fe
Author: Sean Christopherson <seanjc@...gle.com>
AuthorDate: Thu, 10 Nov 2022 20:35:01
Committer: Peter Zijlstra <peterz@...radead.org>
CommitterDate: Tue, 15 Nov 2022 22:29:59 +01:00
x86/mm: Populate KASAN shadow for entire per-CPU range of CPU entry area
Populate a KASAN shadow for the entire possible per-CPU range of the CPU
entry area instead of requiring that each individual chunk map a shadow.
Mapping shadows individually is error prone, e.g. the per-CPU GDT mapping
was left behind, which can lead to not-present page faults during KASAN
validation if the kernel performs a software lookup into the GDT. The DS
buffer is also likely affected.
The motivation for mapping the per-CPU areas on-demand was to avoid
mapping the entire 512GiB range that's reserved for the CPU entry area,
shaving a few bytes by not creating shadows for potentially unused memory
was not a goal.
The bug is most easily reproduced by doing a sigreturn with a garbage
CS in the sigcontext, e.g.
int main(void)
{
struct sigcontext regs;
syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul);
syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
memset(®s, 0, sizeof(regs));
regs.cs = 0x1d0;
syscall(__NR_rt_sigreturn);
return 0;
}
to coerce the kernel into doing a GDT lookup to compute CS.base when
reading the instruction bytes on the subsequent #GP to determine whether
or not the #GP is something the kernel should handle, e.g. to fixup UMIP
violations or to emulate CLI/STI for IOPL=3 applications.
BUG: unable to handle page fault for address: fffffbc8379ace00
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 16c03a067 P4D 16c03a067 PUD 15b990067 PMD 15b98f067 PTE 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 3 PID: 851 Comm: r2 Not tainted 6.1.0-rc3-next-20221103+ #432
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015
RIP: 0010:kasan_check_range+0xdf/0x190
Call Trace:
<TASK>
get_desc+0xb0/0x1d0
insn_get_seg_base+0x104/0x270
insn_fetch_from_user+0x66/0x80
fixup_umip_exception+0xb1/0x530
exc_general_protection+0x181/0x210
asm_exc_general_protection+0x22/0x30
RIP: 0003:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0003:0000000000000000 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00000000000001d0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Fixes: 9fd429c28073 ("x86/kasan: Map shadow for percpu pages on demand")
Reported-by: syzbot+ffb4f000dc2872c93f62@...kaller.appspotmail.com
Suggested-by: Andrey Ryabinin <ryabinin.a.a@...il.com>
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Andrey Ryabinin <ryabinin.a.a@...il.com>
Link: https://lkml.kernel.org/r/20221110203504.1985010-3-seanjc@google.com
---
arch/x86/mm/cpu_entry_area.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/arch/x86/mm/cpu_entry_area.c b/arch/x86/mm/cpu_entry_area.c
index d831aae..7c855df 100644
--- a/arch/x86/mm/cpu_entry_area.c
+++ b/arch/x86/mm/cpu_entry_area.c
@@ -91,11 +91,6 @@ void cea_set_pte(void *cea_vaddr, phys_addr_t pa, pgprot_t flags)
static void __init
cea_map_percpu_pages(void *cea_vaddr, void *ptr, int pages, pgprot_t prot)
{
- phys_addr_t pa = per_cpu_ptr_to_phys(ptr);
-
- kasan_populate_shadow_for_vaddr(cea_vaddr, pages * PAGE_SIZE,
- early_pfn_to_nid(PFN_DOWN(pa)));
-
for ( ; pages; pages--, cea_vaddr+= PAGE_SIZE, ptr += PAGE_SIZE)
cea_set_pte(cea_vaddr, per_cpu_ptr_to_phys(ptr), prot);
}
@@ -195,6 +190,9 @@ static void __init setup_cpu_entry_area(unsigned int cpu)
pgprot_t tss_prot = PAGE_KERNEL;
#endif
+ kasan_populate_shadow_for_vaddr(cea, CPU_ENTRY_AREA_SIZE,
+ early_cpu_to_node(cpu));
+
cea_set_pte(&cea->gdt, get_cpu_gdt_paddr(cpu), gdt_prot);
cea_map_percpu_pages(&cea->entry_stack_page,
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