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-rw-r--r--gnu/packages/patches/strace-kernel-4.16.patch92
1 files changed, 92 insertions, 0 deletions
diff --git a/gnu/packages/patches/strace-kernel-4.16.patch b/gnu/packages/patches/strace-kernel-4.16.patch
new file mode 100644
index 0000000000..e86d3be439
--- /dev/null
+++ b/gnu/packages/patches/strace-kernel-4.16.patch
@@ -0,0 +1,92 @@
+Fix test failure when using Linux-Libre >= 4.16.
+
+Taken from upstream:
+https://github.com/strace/strace/commit/bcff87c31c0f27c678a43d6b7f67dab363a974fa
+
+From bcff87c31c0f27c678a43d6b7f67dab363a974fa Mon Sep 17 00:00:00 2001
+From: Masatake YAMATO <yamato@redhat.com>
+Date: Wed, 2 May 2018 17:11:07 +0900
+Subject: [PATCH] tests/ioctl_kvm_run.c: handle cpuid at the end of vcpu dentry
+
+Since Linux 4.16, kernel appends the cpuid as suffix to the entry
+for a kvm vcpu in /proc/$pid/fd like:
+
+ anon_inode:kvm-vcpu:0
+
+That was
+
+ anon_inode:kvm-vcpu
+
+This kernel change causes the test case failure on newer kernels.
+Update the test to deal with the new name as well as the old one.
+
+* tests/ioctl_kvm_run.c: Include unistd.h for using readlink(2).
+(vcpu_dev_should_have_cpuid): New function for detecting whether
+a proc entry for given fd has the cpuid suffix or not.
+(main): Trim vcpu_dev to remove the cpuid suffix if needed.
+(vcpu_dev): Remove const modifier.
+---
+ tests/ioctl_kvm_run.c | 29 ++++++++++++++++++++++++++++-
+ 1 file changed, 28 insertions(+), 1 deletion(-)
+
+diff --git a/tests/ioctl_kvm_run.c b/tests/ioctl_kvm_run.c
+index 179461430..e1bef5796 100644
+--- a/tests/ioctl_kvm_run.c
++++ b/tests/ioctl_kvm_run.c
+@@ -40,6 +40,7 @@
+ # include <string.h>
+ # include <sys/ioctl.h>
+ # include <sys/mman.h>
++# include <unistd.h>
+ # include <linux/kvm.h>
+
+ static int
+@@ -56,7 +57,7 @@ kvm_ioctl(int fd, unsigned long cmd, const char *cmd_str, void *arg)
+
+ static const char dev[] = "/dev/kvm";
+ static const char vm_dev[] = "anon_inode:kvm-vm";
+-static const char vcpu_dev[] = "anon_inode:kvm-vcpu";
++static char vcpu_dev[] = "anon_inode:kvm-vcpu:0";
+ static size_t page_size;
+
+ extern const char code[];
+@@ -165,6 +166,23 @@ run_kvm(const int vcpu_fd, struct kvm_run *const run, const size_t mmap_size,
+ }
+ }
+
++static int
++vcpu_dev_should_have_cpuid(int fd)
++{
++ int r = 0;
++ char *filename = NULL;
++ char buf[sizeof(vcpu_dev)];
++
++ if (asprintf(&filename, "/proc/%d/fd/%d", getpid(), fd) < 0)
++ error_msg_and_fail("asprintf");
++
++ if (readlink(filename, buf, sizeof(buf)) == sizeof(buf) - 1
++ && (memcmp(buf, vcpu_dev, sizeof(buf) - 1) == 0))
++ r = 1;
++ free(filename);
++ return r;
++}
++
+ int
+ main(void)
+ {
+@@ -208,6 +226,15 @@ main(void)
+ (unsigned long) page_size, (unsigned long) page_size, mem);
+
+ int vcpu_fd = KVM_IOCTL(vm_fd, KVM_CREATE_VCPU, NULL);
++ if (!vcpu_dev_should_have_cpuid(vcpu_fd))
++ /*
++ * This is an older kernel that doesn't place a cpuid
++ * at the end of the dentry associated with vcpu_fd.
++ * Trim the cpuid part of vcpu_dev like:
++ * "anon_inode:kvm-vcpu:0" -> "anon_inode:kvm-vcpu"
++ */
++ vcpu_dev[strlen (vcpu_dev) - 2] = '\0';
++
+ printf("ioctl(%d<%s>, KVM_CREATE_VCPU, 0) = %d<%s>\n",
+ vm_fd, vm_dev, vcpu_fd, vcpu_dev);
+