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authorLinus Torvalds <torvalds@linux-foundation.org>2021-10-09 09:07:58 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-10-09 09:07:58 -0700
commit717478d89fe22df61a4ecf73b1adb31b5f8d1bba (patch)
tree431a0e4d8bce3b77822ece61dddd3331591a3826
parentf84fc4e36cd816d2d5dff0541f32fed411b0355f (diff)
parent3ef6ca4f354c53abf263cbeb51e7272523c294d8 (diff)
Merge tag 'riscv-for-linus-5.15-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux
Pull RISC-V fixes from Palmer Dabbelt: - A pair of fixes (along with the necessory cleanup) to our VDSO, to avoid a locking during OOM and to prevent the text from overflowing into the data page - A fix to checksyscalls to teach it about our rv32 UABI - A fix to add clone3() to the rv32 UABI, which was pointed out by checksyscalls - A fix to properly flush the icache on the local CPU in addition to the remote CPUs * tag 'riscv-for-linus-5.15-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux: checksyscalls: Unconditionally ignore fstat{,at}64 riscv: Flush current cpu icache before other cpus RISC-V: Include clone3() on rv32 riscv/vdso: make arch_setup_additional_pages wait for mmap_sem for write killable riscv/vdso: Move vdso data page up front riscv/vdso: Refactor asm/vdso.h
-rw-r--r--arch/riscv/include/asm/syscall.h1
-rw-r--r--arch/riscv/include/asm/vdso.h18
-rw-r--r--arch/riscv/include/uapi/asm/unistd.h3
-rw-r--r--arch/riscv/kernel/syscall_table.c1
-rw-r--r--arch/riscv/kernel/vdso.c53
-rw-r--r--arch/riscv/kernel/vdso/vdso.lds.S3
-rw-r--r--arch/riscv/mm/cacheflush.c2
-rwxr-xr-xscripts/checksyscalls.sh6
8 files changed, 56 insertions, 31 deletions
diff --git a/arch/riscv/include/asm/syscall.h b/arch/riscv/include/asm/syscall.h
index b933b1583c9f..34fbb3ea21d5 100644
--- a/arch/riscv/include/asm/syscall.h
+++ b/arch/riscv/include/asm/syscall.h
@@ -82,4 +82,5 @@ static inline int syscall_get_arch(struct task_struct *task)
#endif
}
+asmlinkage long sys_riscv_flush_icache(uintptr_t, uintptr_t, uintptr_t);
#endif /* _ASM_RISCV_SYSCALL_H */
diff --git a/arch/riscv/include/asm/vdso.h b/arch/riscv/include/asm/vdso.h
index 893e47195e30..208e31bc5d1c 100644
--- a/arch/riscv/include/asm/vdso.h
+++ b/arch/riscv/include/asm/vdso.h
@@ -16,18 +16,24 @@
#ifdef CONFIG_MMU
#include <linux/types.h>
-#include <generated/vdso-offsets.h>
+/*
+ * All systems with an MMU have a VDSO, but systems without an MMU don't
+ * support shared libraries and therefor don't have one.
+ */
+#ifdef CONFIG_MMU
+
+#define __VVAR_PAGES 1
-#ifndef CONFIG_GENERIC_TIME_VSYSCALL
-struct vdso_data {
-};
-#endif
+#ifndef __ASSEMBLY__
+#include <generated/vdso-offsets.h>
#define VDSO_SYMBOL(base, name) \
(void __user *)((unsigned long)(base) + __vdso_##name##_offset)
#endif /* CONFIG_MMU */
-asmlinkage long sys_riscv_flush_icache(uintptr_t, uintptr_t, uintptr_t);
+#endif /* !__ASSEMBLY__ */
+
+#endif /* CONFIG_MMU */
#endif /* _ASM_RISCV_VDSO_H */
diff --git a/arch/riscv/include/uapi/asm/unistd.h b/arch/riscv/include/uapi/asm/unistd.h
index 4b989ae15d59..8062996c2dfd 100644
--- a/arch/riscv/include/uapi/asm/unistd.h
+++ b/arch/riscv/include/uapi/asm/unistd.h
@@ -18,9 +18,10 @@
#ifdef __LP64__
#define __ARCH_WANT_NEW_STAT
#define __ARCH_WANT_SET_GET_RLIMIT
-#define __ARCH_WANT_SYS_CLONE3
#endif /* __LP64__ */
+#define __ARCH_WANT_SYS_CLONE3
+
#include <asm-generic/unistd.h>
/*
diff --git a/arch/riscv/kernel/syscall_table.c b/arch/riscv/kernel/syscall_table.c
index a63c667c27b3..44b1420a2270 100644
--- a/arch/riscv/kernel/syscall_table.c
+++ b/arch/riscv/kernel/syscall_table.c
@@ -7,7 +7,6 @@
#include <linux/linkage.h>
#include <linux/syscalls.h>
#include <asm-generic/syscalls.h>
-#include <asm/vdso.h>
#include <asm/syscall.h>
#undef __SYSCALL
diff --git a/arch/riscv/kernel/vdso.c b/arch/riscv/kernel/vdso.c
index 25a3b8849599..b70956d80408 100644
--- a/arch/riscv/kernel/vdso.c
+++ b/arch/riscv/kernel/vdso.c
@@ -12,14 +12,24 @@
#include <linux/binfmts.h>
#include <linux/err.h>
#include <asm/page.h>
+#include <asm/vdso.h>
+
#ifdef CONFIG_GENERIC_TIME_VSYSCALL
#include <vdso/datapage.h>
#else
-#include <asm/vdso.h>
+struct vdso_data {
+};
#endif
extern char vdso_start[], vdso_end[];
+enum vvar_pages {
+ VVAR_DATA_PAGE_OFFSET,
+ VVAR_NR_PAGES,
+};
+
+#define VVAR_SIZE (VVAR_NR_PAGES << PAGE_SHIFT)
+
static unsigned int vdso_pages __ro_after_init;
static struct page **vdso_pagelist __ro_after_init;
@@ -38,7 +48,7 @@ static int __init vdso_init(void)
vdso_pages = (vdso_end - vdso_start) >> PAGE_SHIFT;
vdso_pagelist =
- kcalloc(vdso_pages + 1, sizeof(struct page *), GFP_KERNEL);
+ kcalloc(vdso_pages + VVAR_NR_PAGES, sizeof(struct page *), GFP_KERNEL);
if (unlikely(vdso_pagelist == NULL)) {
pr_err("vdso: pagelist allocation failed\n");
return -ENOMEM;
@@ -63,38 +73,41 @@ int arch_setup_additional_pages(struct linux_binprm *bprm,
unsigned long vdso_base, vdso_len;
int ret;
- vdso_len = (vdso_pages + 1) << PAGE_SHIFT;
+ BUILD_BUG_ON(VVAR_NR_PAGES != __VVAR_PAGES);
+
+ vdso_len = (vdso_pages + VVAR_NR_PAGES) << PAGE_SHIFT;
+
+ if (mmap_write_lock_killable(mm))
+ return -EINTR;
- mmap_write_lock(mm);
vdso_base = get_unmapped_area(NULL, 0, vdso_len, 0, 0);
if (IS_ERR_VALUE(vdso_base)) {
ret = vdso_base;
goto end;
}
- /*
- * Put vDSO base into mm struct. We need to do this before calling
- * install_special_mapping or the perf counter mmap tracking code
- * will fail to recognise it as a vDSO (since arch_vma_name fails).
- */
- mm->context.vdso = (void *)vdso_base;
+ mm->context.vdso = NULL;
+ ret = install_special_mapping(mm, vdso_base, VVAR_SIZE,
+ (VM_READ | VM_MAYREAD), &vdso_pagelist[vdso_pages]);
+ if (unlikely(ret))
+ goto end;
ret =
- install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT,
+ install_special_mapping(mm, vdso_base + VVAR_SIZE,
+ vdso_pages << PAGE_SHIFT,
(VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC),
vdso_pagelist);
- if (unlikely(ret)) {
- mm->context.vdso = NULL;
+ if (unlikely(ret))
goto end;
- }
- vdso_base += (vdso_pages << PAGE_SHIFT);
- ret = install_special_mapping(mm, vdso_base, PAGE_SIZE,
- (VM_READ | VM_MAYREAD), &vdso_pagelist[vdso_pages]);
+ /*
+ * Put vDSO base into mm struct. We need to do this before calling
+ * install_special_mapping or the perf counter mmap tracking code
+ * will fail to recognise it as a vDSO (since arch_vma_name fails).
+ */
+ mm->context.vdso = (void *)vdso_base + VVAR_SIZE;
- if (unlikely(ret))
- mm->context.vdso = NULL;
end:
mmap_write_unlock(mm);
return ret;
@@ -105,7 +118,7 @@ const char *arch_vma_name(struct vm_area_struct *vma)
if (vma->vm_mm && (vma->vm_start == (long)vma->vm_mm->context.vdso))
return "[vdso]";
if (vma->vm_mm && (vma->vm_start ==
- (long)vma->vm_mm->context.vdso + PAGE_SIZE))
+ (long)vma->vm_mm->context.vdso - VVAR_SIZE))
return "[vdso_data]";
return NULL;
}
diff --git a/arch/riscv/kernel/vdso/vdso.lds.S b/arch/riscv/kernel/vdso/vdso.lds.S
index e6f558bca71b..e9111f700af0 100644
--- a/arch/riscv/kernel/vdso/vdso.lds.S
+++ b/arch/riscv/kernel/vdso/vdso.lds.S
@@ -3,12 +3,13 @@
* Copyright (C) 2012 Regents of the University of California
*/
#include <asm/page.h>
+#include <asm/vdso.h>
OUTPUT_ARCH(riscv)
SECTIONS
{
- PROVIDE(_vdso_data = . + PAGE_SIZE);
+ PROVIDE(_vdso_data = . - __VVAR_PAGES * PAGE_SIZE);
. = SIZEOF_HEADERS;
.hash : { *(.hash) } :text
diff --git a/arch/riscv/mm/cacheflush.c b/arch/riscv/mm/cacheflush.c
index 094118663285..89f81067e09e 100644
--- a/arch/riscv/mm/cacheflush.c
+++ b/arch/riscv/mm/cacheflush.c
@@ -16,6 +16,8 @@ static void ipi_remote_fence_i(void *info)
void flush_icache_all(void)
{
+ local_flush_icache_all();
+
if (IS_ENABLED(CONFIG_RISCV_SBI))
sbi_remote_fence_i(NULL);
else
diff --git a/scripts/checksyscalls.sh b/scripts/checksyscalls.sh
index fd9777f63f14..9dbab13329fa 100755
--- a/scripts/checksyscalls.sh
+++ b/scripts/checksyscalls.sh
@@ -82,10 +82,8 @@ cat << EOF
#define __IGNORE_truncate64
#define __IGNORE_stat64
#define __IGNORE_lstat64
-#define __IGNORE_fstat64
#define __IGNORE_fcntl64
#define __IGNORE_fadvise64_64
-#define __IGNORE_fstatat64
#define __IGNORE_fstatfs64
#define __IGNORE_statfs64
#define __IGNORE_llseek
@@ -253,6 +251,10 @@ cat << EOF
#define __IGNORE_getpmsg
#define __IGNORE_putpmsg
#define __IGNORE_vserver
+
+/* 64-bit ports never needed these, and new 32-bit ports can use statx */
+#define __IGNORE_fstat64
+#define __IGNORE_fstatat64
EOF
}