mirror of
https://github.com/JakeHillion/drgn.git
synced 2024-12-22 01:03:07 +00:00
vmtest: add patch to fix /proc/vmcore reads on s390x on Linux 5.18 and 5.19
Signed-off-by: Omar Sandoval <osandov@osandov.com>
This commit is contained in:
Omar Sandoval
parent
8eb0d23538
commit
7e60bc7ac3
@ -39,7 +39,7 @@ SUPPORTED_KERNEL_VERSIONS = (
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)
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)
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KERNEL_ORG_COMPILER_VERSION = "12.2.0"
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KERNEL_ORG_COMPILER_VERSION = "12.2.0"
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VMTEST_KERNEL_VERSION = 28
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VMTEST_KERNEL_VERSION = 29
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BASE_KCONFIG = """
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BASE_KCONFIG = """
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@ -130,6 +130,10 @@ _PATCHES = (
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name="s390-kernel-emit-CFI-data-in-.debug_frame-and-discar.patch",
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name="s390-kernel-emit-CFI-data-in-.debug_frame-and-discar.patch",
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versions=((None, KernelVersion("4.15")),),
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versions=((None, KernelVersion("4.15")),),
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),
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),
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_Patch(
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name="s390-crash-fix-proc-vmcore-reads.patch",
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versions=((KernelVersion("5.18"), KernelVersion("6.0")),),
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),
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)
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)
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422
vmtest/patches/s390-crash-fix-proc-vmcore-reads.patch
Normal file
422
vmtest/patches/s390-crash-fix-proc-vmcore-reads.patch
Normal file
@ -0,0 +1,422 @@
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From 531194bfade3a8fb9f5ed25fe3b615219d92996c Mon Sep 17 00:00:00 2001
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Message-ID: <531194bfade3a8fb9f5ed25fe3b615219d92996c.1710188478.git.osandov@osandov.com>
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From: Omar Sandoval <osandov@osandov.com>
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Date: Mon, 11 Mar 2024 13:08:27 -0700
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Subject: [PATCH] s390/crash: fix /proc/vmcore reads
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Squashed backport of the following upstream commits:
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7190d84966b3 ("s390/mm: remove unused tprot() function")
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d6da67378198 ("s390/crash: move copy_to_user_real() to crash_dump.c")
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6d2e5a4a13da ("s390/crash: use static swap buffer for copy_to_user_real()")
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ebbc95701691 ("s390/crash: support multi-segment iterators")
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Signed-off-by: Omar Sandoval <osandov@osandov.com>
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---
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arch/s390/include/asm/mmu.h | 14 ----
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arch/s390/include/asm/os_info.h | 17 ++++-
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arch/s390/include/asm/sclp.h | 4 +-
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arch/s390/include/asm/uaccess.h | 1 -
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arch/s390/kernel/crash_dump.c | 118 ++++++++------------------------
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arch/s390/mm/maccess.c | 26 -------
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drivers/s390/char/zcore.c | 58 +++++++---------
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7 files changed, 70 insertions(+), 168 deletions(-)
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diff --git a/arch/s390/include/asm/mmu.h b/arch/s390/include/asm/mmu.h
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index 82aae78e1315..bc254bce48fa 100644
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--- a/arch/s390/include/asm/mmu.h
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+++ b/arch/s390/include/asm/mmu.h
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@@ -42,18 +42,4 @@ typedef struct {
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.context.pgtable_list = LIST_HEAD_INIT(name.context.pgtable_list), \
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.context.gmap_list = LIST_HEAD_INIT(name.context.gmap_list),
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-static inline int tprot(unsigned long addr)
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-{
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- int rc = -EFAULT;
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-
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- asm volatile(
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- " tprot 0(%1),0\n"
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- "0: ipm %0\n"
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- " srl %0,28\n"
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- "1:\n"
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- EX_TABLE(0b,1b)
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- : "+d" (rc) : "a" (addr) : "cc");
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- return rc;
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-}
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-
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#endif
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diff --git a/arch/s390/include/asm/os_info.h b/arch/s390/include/asm/os_info.h
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index 147a8d547ef9..85248d8fee0c 100644
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--- a/arch/s390/include/asm/os_info.h
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+++ b/arch/s390/include/asm/os_info.h
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@@ -8,6 +8,8 @@
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#ifndef _ASM_S390_OS_INFO_H
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#define _ASM_S390_OS_INFO_H
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+#include <linux/uio.h>
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+
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#define OS_INFO_VERSION_MAJOR 1
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#define OS_INFO_VERSION_MINOR 1
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#define OS_INFO_MAGIC 0x4f53494e464f535aULL /* OSINFOSZ */
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@@ -39,7 +41,20 @@ u32 os_info_csum(struct os_info *os_info);
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#ifdef CONFIG_CRASH_DUMP
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void *os_info_old_entry(int nr, unsigned long *size);
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-int copy_oldmem_kernel(void *dst, unsigned long src, size_t count);
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+size_t copy_oldmem_iter(struct iov_iter *iter, unsigned long src, size_t count);
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+
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+static inline int copy_oldmem_kernel(void *dst, unsigned long src, size_t count)
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+{
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+ struct iov_iter iter;
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+ struct kvec kvec;
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+
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+ kvec.iov_base = dst;
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+ kvec.iov_len = count;
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+ iov_iter_kvec(&iter, WRITE, &kvec, 1, count);
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+ if (copy_oldmem_iter(&iter, src, count) < count)
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+ return -EFAULT;
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+ return 0;
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+}
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#else
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static inline void *os_info_old_entry(int nr, unsigned long *size)
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{
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diff --git a/arch/s390/include/asm/sclp.h b/arch/s390/include/asm/sclp.h
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index 236b34b75ddb..24ee532fab84 100644
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--- a/arch/s390/include/asm/sclp.h
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+++ b/arch/s390/include/asm/sclp.h
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@@ -17,6 +17,7 @@
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#define EXT_SCCB_READ_CPU (3 * PAGE_SIZE)
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#ifndef __ASSEMBLY__
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+#include <linux/uio.h>
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#include <asm/chpid.h>
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#include <asm/cpu.h>
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@@ -142,8 +143,7 @@ int sclp_pci_deconfigure(u32 fid);
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int sclp_ap_configure(u32 apid);
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int sclp_ap_deconfigure(u32 apid);
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int sclp_pci_report(struct zpci_report_error_header *report, u32 fh, u32 fid);
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-int memcpy_hsa_kernel(void *dest, unsigned long src, size_t count);
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-int memcpy_hsa_user(void __user *dest, unsigned long src, size_t count);
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+size_t memcpy_hsa_iter(struct iov_iter *iter, unsigned long src, size_t count);
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void sclp_ocf_cpc_name_copy(char *dst);
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static inline int sclp_get_core_info(struct sclp_core_info *info, int early)
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diff --git a/arch/s390/include/asm/uaccess.h b/arch/s390/include/asm/uaccess.h
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index f4511e21d646..2a067315fe59 100644
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--- a/arch/s390/include/asm/uaccess.h
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+++ b/arch/s390/include/asm/uaccess.h
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@@ -285,7 +285,6 @@ static inline unsigned long __must_check clear_user(void __user *to, unsigned lo
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return __clear_user(to, n);
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}
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-int copy_to_user_real(void __user *dest, unsigned long src, unsigned long count);
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void *s390_kernel_write(void *dst, const void *src, size_t size);
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int __noreturn __put_kernel_bad(void);
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diff --git a/arch/s390/kernel/crash_dump.c b/arch/s390/kernel/crash_dump.c
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index f8ebdd70dd31..49c035e5b75d 100644
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--- a/arch/s390/kernel/crash_dump.c
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+++ b/arch/s390/kernel/crash_dump.c
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@@ -53,6 +53,8 @@ struct save_area {
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};
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static LIST_HEAD(dump_save_areas);
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+static DEFINE_MUTEX(memcpy_real_mutex);
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+static char memcpy_real_buf[PAGE_SIZE];
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/*
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* Allocate a save area
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@@ -114,38 +116,35 @@ void __init save_area_add_vxrs(struct save_area *sa, __vector128 *vxrs)
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memcpy(sa->vxrs_high, vxrs + 16, 16 * sizeof(__vector128));
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}
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-/*
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- * Return physical address for virtual address
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- */
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-static inline void *load_real_addr(void *addr)
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+static size_t copy_to_iter_real(struct iov_iter *iter, unsigned long src, size_t count)
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{
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- unsigned long real_addr;
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+ size_t len, copied, res = 0;
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- asm volatile(
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- " lra %0,0(%1)\n"
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- " jz 0f\n"
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- " la %0,0\n"
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- "0:"
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- : "=a" (real_addr) : "a" (addr) : "cc");
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- return (void *)real_addr;
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+ mutex_lock(&memcpy_real_mutex);
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+ while (count) {
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+ len = min(PAGE_SIZE, count);
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+ if (memcpy_real(memcpy_real_buf, src, len))
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+ break;
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+ copied = copy_to_iter(memcpy_real_buf, len, iter);
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+ count -= copied;
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+ src += copied;
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+ res += copied;
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+ if (copied < len)
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+ break;
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+ }
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+ mutex_unlock(&memcpy_real_mutex);
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+ return res;
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}
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-/*
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- * Copy memory of the old, dumped system to a kernel space virtual address
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- */
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-int copy_oldmem_kernel(void *dst, unsigned long src, size_t count)
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+size_t copy_oldmem_iter(struct iov_iter *iter, unsigned long src, size_t count)
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{
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- unsigned long len;
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- void *ra;
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- int rc;
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+ size_t len, copied, res = 0;
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|
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|
while (count) {
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|
if (!oldmem_data.start && src < sclp.hsa_size) {
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|
/* Copy from zfcp/nvme dump HSA area */
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|
len = min(count, sclp.hsa_size - src);
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|
- rc = memcpy_hsa_kernel(dst, src, len);
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|
- if (rc)
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|
- return rc;
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|
+ copied = memcpy_hsa_iter(iter, src, len);
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|
} else {
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|
/* Check for swapped kdump oldmem areas */
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|
if (oldmem_data.start && src - oldmem_data.start < oldmem_data.size) {
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|
@@ -157,57 +156,15 @@ int copy_oldmem_kernel(void *dst, unsigned long src, size_t count)
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|
} else {
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|
len = count;
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|
}
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|
- if (is_vmalloc_or_module_addr(dst)) {
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|
- ra = load_real_addr(dst);
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|
- len = min(PAGE_SIZE - offset_in_page(ra), len);
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|
- } else {
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|
- ra = dst;
|
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|
- }
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|
- if (memcpy_real(ra, src, len))
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|
- return -EFAULT;
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|
+ copied = copy_to_iter_real(iter, src, len);
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|
}
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|
- dst += len;
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|
- src += len;
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|
- count -= len;
|
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|
+ count -= copied;
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|
+ src += copied;
|
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|
+ res += copied;
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|
+ if (copied < len)
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|
+ break;
|
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|
}
|
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|
- return 0;
|
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|
-}
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|
-
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|
-/*
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|
- * Copy memory of the old, dumped system to a user space virtual address
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|
- */
|
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|
-static int copy_oldmem_user(void __user *dst, unsigned long src, size_t count)
|
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|
-{
|
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|
- unsigned long len;
|
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|
- int rc;
|
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|
-
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|
- while (count) {
|
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|
- if (!oldmem_data.start && src < sclp.hsa_size) {
|
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|
- /* Copy from zfcp/nvme dump HSA area */
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|
- len = min(count, sclp.hsa_size - src);
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|
- rc = memcpy_hsa_user(dst, src, len);
|
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|
- if (rc)
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|
- return rc;
|
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|
- } else {
|
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|
- /* Check for swapped kdump oldmem areas */
|
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|
- if (oldmem_data.start && src - oldmem_data.start < oldmem_data.size) {
|
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|
- src -= oldmem_data.start;
|
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|
- len = min(count, oldmem_data.size - src);
|
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|
- } else if (oldmem_data.start && src < oldmem_data.size) {
|
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|
- len = min(count, oldmem_data.size - src);
|
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|
- src += oldmem_data.start;
|
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|
- } else {
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|
- len = count;
|
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|
- }
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|
- rc = copy_to_user_real(dst, src, len);
|
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|
- if (rc)
|
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|
- return rc;
|
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|
- }
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|
- dst += len;
|
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|
- src += len;
|
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|
- count -= len;
|
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|
- }
|
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|
- return 0;
|
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|
+ return res;
|
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|
}
|
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|
|
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|
/*
|
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|
@@ -217,26 +174,9 @@ ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn, size_t csize,
|
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|
unsigned long offset)
|
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|
{
|
||||||
|
unsigned long src;
|
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|
- int rc;
|
||||||
|
|
||||||
|
- if (!(iter_is_iovec(iter) || iov_iter_is_kvec(iter)))
|
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|
- return -EINVAL;
|
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|
- /* Multi-segment iterators are not supported */
|
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|
- if (iter->nr_segs > 1)
|
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|
- return -EINVAL;
|
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|
- if (!csize)
|
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|
- return 0;
|
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|
src = pfn_to_phys(pfn) + offset;
|
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|
-
|
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|
- /* XXX: pass the iov_iter down to a common function */
|
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|
- if (iter_is_iovec(iter))
|
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|
- rc = copy_oldmem_user(iter->iov->iov_base, src, csize);
|
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|
- else
|
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|
- rc = copy_oldmem_kernel(iter->kvec->iov_base, src, csize);
|
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|
- if (rc < 0)
|
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|
- return rc;
|
||||||
|
- iov_iter_advance(iter, csize);
|
||||||
|
- return csize;
|
||||||
|
+ return copy_oldmem_iter(iter, src, csize);
|
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|
}
|
||||||
|
|
||||||
|
/*
|
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|
diff --git a/arch/s390/mm/maccess.c b/arch/s390/mm/maccess.c
|
||||||
|
index 421efa46946b..d6d84e02f35a 100644
|
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|
--- a/arch/s390/mm/maccess.c
|
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|
+++ b/arch/s390/mm/maccess.c
|
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|
@@ -171,32 +171,6 @@ void memcpy_absolute(void *dest, void *src, size_t count)
|
||||||
|
arch_local_irq_restore(flags);
|
||||||
|
}
|
||||||
|
|
||||||
|
-/*
|
||||||
|
- * Copy memory from kernel (real) to user (virtual)
|
||||||
|
- */
|
||||||
|
-int copy_to_user_real(void __user *dest, unsigned long src, unsigned long count)
|
||||||
|
-{
|
||||||
|
- int offs = 0, size, rc;
|
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|
- char *buf;
|
||||||
|
-
|
||||||
|
- buf = (char *) __get_free_page(GFP_KERNEL);
|
||||||
|
- if (!buf)
|
||||||
|
- return -ENOMEM;
|
||||||
|
- rc = -EFAULT;
|
||||||
|
- while (offs < count) {
|
||||||
|
- size = min(PAGE_SIZE, count - offs);
|
||||||
|
- if (memcpy_real(buf, src + offs, size))
|
||||||
|
- goto out;
|
||||||
|
- if (copy_to_user(dest + offs, buf, size))
|
||||||
|
- goto out;
|
||||||
|
- offs += size;
|
||||||
|
- }
|
||||||
|
- rc = 0;
|
||||||
|
-out:
|
||||||
|
- free_page((unsigned long) buf);
|
||||||
|
- return rc;
|
||||||
|
-}
|
||||||
|
-
|
||||||
|
/*
|
||||||
|
* Check if physical address is within prefix or zero page
|
||||||
|
*/
|
||||||
|
diff --git a/drivers/s390/char/zcore.c b/drivers/s390/char/zcore.c
|
||||||
|
index 92b32ce645b9..f6da215ccf9f 100644
|
||||||
|
--- a/drivers/s390/char/zcore.c
|
||||||
|
+++ b/drivers/s390/char/zcore.c
|
||||||
|
@@ -17,6 +17,7 @@
|
||||||
|
#include <linux/debugfs.h>
|
||||||
|
#include <linux/panic_notifier.h>
|
||||||
|
#include <linux/reboot.h>
|
||||||
|
+#include <linux/uio.h>
|
||||||
|
|
||||||
|
#include <asm/asm-offsets.h>
|
||||||
|
#include <asm/ipl.h>
|
||||||
|
@@ -54,38 +55,37 @@ static DEFINE_MUTEX(hsa_buf_mutex);
|
||||||
|
static char hsa_buf[PAGE_SIZE] __aligned(PAGE_SIZE);
|
||||||
|
|
||||||
|
/*
|
||||||
|
- * Copy memory from HSA to user memory (not reentrant):
|
||||||
|
+ * Copy memory from HSA to iterator (not reentrant):
|
||||||
|
*
|
||||||
|
- * @dest: User buffer where memory should be copied to
|
||||||
|
+ * @iter: Iterator where memory should be copied to
|
||||||
|
* @src: Start address within HSA where data should be copied
|
||||||
|
* @count: Size of buffer, which should be copied
|
||||||
|
*/
|
||||||
|
-int memcpy_hsa_user(void __user *dest, unsigned long src, size_t count)
|
||||||
|
+size_t memcpy_hsa_iter(struct iov_iter *iter, unsigned long src, size_t count)
|
||||||
|
{
|
||||||
|
- unsigned long offset, bytes;
|
||||||
|
+ size_t bytes, copied, res = 0;
|
||||||
|
+ unsigned long offset;
|
||||||
|
|
||||||
|
if (!hsa_available)
|
||||||
|
- return -ENODATA;
|
||||||
|
+ return 0;
|
||||||
|
|
||||||
|
mutex_lock(&hsa_buf_mutex);
|
||||||
|
while (count) {
|
||||||
|
if (sclp_sdias_copy(hsa_buf, src / PAGE_SIZE + 2, 1)) {
|
||||||
|
TRACE("sclp_sdias_copy() failed\n");
|
||||||
|
- mutex_unlock(&hsa_buf_mutex);
|
||||||
|
- return -EIO;
|
||||||
|
+ break;
|
||||||
|
}
|
||||||
|
offset = src % PAGE_SIZE;
|
||||||
|
bytes = min(PAGE_SIZE - offset, count);
|
||||||
|
- if (copy_to_user(dest, hsa_buf + offset, bytes)) {
|
||||||
|
- mutex_unlock(&hsa_buf_mutex);
|
||||||
|
- return -EFAULT;
|
||||||
|
- }
|
||||||
|
- src += bytes;
|
||||||
|
- dest += bytes;
|
||||||
|
- count -= bytes;
|
||||||
|
+ copied = copy_to_iter(hsa_buf + offset, bytes, iter);
|
||||||
|
+ count -= copied;
|
||||||
|
+ src += copied;
|
||||||
|
+ res += copied;
|
||||||
|
+ if (copied < bytes)
|
||||||
|
+ break;
|
||||||
|
}
|
||||||
|
mutex_unlock(&hsa_buf_mutex);
|
||||||
|
- return 0;
|
||||||
|
+ return res;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
@@ -95,28 +95,16 @@ int memcpy_hsa_user(void __user *dest, unsigned long src, size_t count)
|
||||||
|
* @src: Start address within HSA where data should be copied
|
||||||
|
* @count: Size of buffer, which should be copied
|
||||||
|
*/
|
||||||
|
-int memcpy_hsa_kernel(void *dest, unsigned long src, size_t count)
|
||||||
|
+static inline int memcpy_hsa_kernel(void *dst, unsigned long src, size_t count)
|
||||||
|
{
|
||||||
|
- unsigned long offset, bytes;
|
||||||
|
+ struct iov_iter iter;
|
||||||
|
+ struct kvec kvec;
|
||||||
|
|
||||||
|
- if (!hsa_available)
|
||||||
|
- return -ENODATA;
|
||||||
|
-
|
||||||
|
- mutex_lock(&hsa_buf_mutex);
|
||||||
|
- while (count) {
|
||||||
|
- if (sclp_sdias_copy(hsa_buf, src / PAGE_SIZE + 2, 1)) {
|
||||||
|
- TRACE("sclp_sdias_copy() failed\n");
|
||||||
|
- mutex_unlock(&hsa_buf_mutex);
|
||||||
|
- return -EIO;
|
||||||
|
- }
|
||||||
|
- offset = src % PAGE_SIZE;
|
||||||
|
- bytes = min(PAGE_SIZE - offset, count);
|
||||||
|
- memcpy(dest, hsa_buf + offset, bytes);
|
||||||
|
- src += bytes;
|
||||||
|
- dest += bytes;
|
||||||
|
- count -= bytes;
|
||||||
|
- }
|
||||||
|
- mutex_unlock(&hsa_buf_mutex);
|
||||||
|
+ kvec.iov_base = dst;
|
||||||
|
+ kvec.iov_len = count;
|
||||||
|
+ iov_iter_kvec(&iter, WRITE, &kvec, 1, count);
|
||||||
|
+ if (memcpy_hsa_iter(&iter, src, count) < count)
|
||||||
|
+ return -EIO;
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
--
|
||||||
|
2.44.0
|
||||||
|
|
||||||
Loading…
Reference in New Issue
Block a user