Resolves: #1953669 - cp: pick additional copy_file_range()-related fixes
... from upstream
This commit is contained in:
Kamil Dudka
parent
11bc51561e
commit
6d9a280d43
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@ -1,7 +1,7 @@
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From 5f2dac18054d9d9b3d84e7fba8c2a6e750d2c245 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?P=C3=A1draig=20Brady?= <P@draigBrady.com>
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Date: Wed, 1 Apr 2020 12:51:34 +0100
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Subject: [PATCH 1/8] cp: ensure --attributes-only doesn't remove files
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Subject: [PATCH 01/12] cp: ensure --attributes-only doesn't remove files
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* src/copy.c (copy_internal): Ensure we don't unlink the destination
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unless explicitly requested.
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@ -77,7 +77,7 @@ index 59ce641..14fc844 100755
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From c728747b06e71894c96d1f27434f2484af992c75 Mon Sep 17 00:00:00 2001
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From: Paul Eggert <eggert@cs.ucla.edu>
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Date: Tue, 23 Jun 2020 19:18:04 -0700
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Subject: [PATCH 2/8] cp: refactor extent_copy
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Subject: [PATCH 02/12] cp: refactor extent_copy
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* src/copy.c (extent_copy): New arg SCAN, replacing
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REQUIRE_NORMAL_COPY. All callers changed.
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@ -320,7 +320,7 @@ index 54601ce..f694f91 100644
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From ed7ff81de507bef46991f4caac550f41ab65e3ed Mon Sep 17 00:00:00 2001
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From: Paul Eggert <eggert@cs.ucla.edu>
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Date: Wed, 24 Jun 2020 17:05:20 -0700
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Subject: [PATCH 3/8] cp: avoid copy_reg goto
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Subject: [PATCH 03/12] cp: avoid copy_reg goto
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* src/copy.c (copy_reg): Redo to avoid label and goto.
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@ -390,7 +390,7 @@ index f694f91..b382cfa 100644
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From 5631bded3a385ca0bbd77456b50767fe5580240c Mon Sep 17 00:00:00 2001
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From: Paul Eggert <eggert@cs.ucla.edu>
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Date: Thu, 25 Jun 2020 16:31:44 -0700
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Subject: [PATCH 4/8] cp: use SEEK_DATA/SEEK_HOLE if available
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Subject: [PATCH 04/12] cp: use SEEK_DATA/SEEK_HOLE if available
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If it works, prefer lseek with SEEK_DATA and SEEK_HOLE to FIEMAP,
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as lseek is simpler and more portable (will be in next POSIX).
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@ -701,7 +701,7 @@ index b382cfa..d88f8cf 100644
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From be7466be92d779cfbece418d4de33191ae52ab4a Mon Sep 17 00:00:00 2001
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From: Kamil Dudka <kdudka@redhat.com>
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Date: Wed, 24 Mar 2021 16:06:53 +0100
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Subject: [PATCH 5/8] import the copy-file-range module from gnulib
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Subject: [PATCH 05/12] import the copy-file-range module from gnulib
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---
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aclocal.m4 | 1 +
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@ -896,7 +896,7 @@ index dead90e..953e7f0 100644
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From 48370c95bcf7c25ce021fbd2145062d3d29ae6d5 Mon Sep 17 00:00:00 2001
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From: Paul Eggert <eggert@cs.ucla.edu>
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Date: Thu, 25 Jun 2020 17:34:23 -0700
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Subject: [PATCH 6/8] cp: use copy_file_range if available
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Subject: [PATCH 06/12] cp: use copy_file_range if available
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* NEWS: Mention this.
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* bootstrap.conf (gnulib_modules): Add copy-file-range.
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@ -980,7 +980,7 @@ index d88f8cf..4050f69 100644
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From 23ea1ba463d33e268f35847059e637a5935e4581 Mon Sep 17 00:00:00 2001
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From: Zorro Lang <zlang@redhat.com>
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Date: Mon, 26 Apr 2021 17:25:18 +0200
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Subject: [PATCH 7/8] copy: do not refuse to copy a swap file
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Subject: [PATCH 07/12] copy: do not refuse to copy a swap file
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* src/copy.c (sparse_copy): Fallback to read() if copy_file_range()
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fails with ETXTBSY. Otherwise it would be impossible to copy files
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@ -1013,7 +1013,7 @@ index 4050f69..1798bb7 100644
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From cd7c7a6b5ad89ef0a61722552d532901fc1bed05 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?P=C3=A1draig=20Brady?= <P@draigBrady.com>
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Date: Sun, 2 May 2021 21:27:17 +0100
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Subject: [PATCH 8/8] copy: ensure we enforce --reflink=never
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Subject: [PATCH 08/12] copy: ensure we enforce --reflink=never
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* src/copy.c (sparse_copy): Don't use copy_file_range()
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with --reflink=never as copy_file_range() may implicitly
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@ -1115,3 +1115,225 @@ index 4050f69..0337538 100644
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--
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2.30.2
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From 7978f1de88dcdb17b67db9268038930e9c71154f Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?P=C3=A1draig=20Brady?= <P@draigBrady.com>
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Date: Sat, 8 May 2021 17:18:54 +0100
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Subject: [PATCH 09/12] copy: handle ENOTSUP from copy_file_range()
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* src/copy.c (sparse_copy): Ensure we fall back to
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a standard copy if copy_file_range() returns ENOTSUP.
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This generally is best checked when checking ENOSYS,
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but it also seems to be a practical concern on Centos 7,
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as a quick search gave https://bugzilla.redhat.com/1840284
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Upstream-commit: 8ec0d1799e19a079b8a661c6bb69f6c58e52f1aa
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Signed-off-by: Kamil Dudka <kdudka@redhat.com>
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---
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src/copy.c | 5 +++--
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1 file changed, 3 insertions(+), 2 deletions(-)
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diff --git a/src/copy.c b/src/copy.c
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index 9977193..e3977cd 100644
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--- a/src/copy.c
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+++ b/src/copy.c
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@@ -290,8 +290,9 @@ sparse_copy (int src_fd, int dest_fd, char *buf, size_t buf_size,
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}
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if (n_copied < 0)
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{
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- if (errno == ENOSYS || errno == EINVAL
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- || errno == EBADF || errno == EXDEV || errno == ETXTBSY)
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+ if (errno == ENOSYS || is_ENOTSUP (errno)
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+ || errno == EINVAL || errno == EBADF
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+ || errno == EXDEV || errno == ETXTBSY)
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break;
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if (errno == EINTR)
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n_copied = 0;
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--
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2.31.1
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From d8d3edbfc13ff13c185f23436209b788f906aa41 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?P=C3=A1draig=20Brady?= <P@draigBrady.com>
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Date: Sun, 9 May 2021 21:55:22 +0100
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Subject: [PATCH 10/12] copy: handle EOPNOTSUPP from SEEK_DATA
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* src/copy.c (infer_scantype): Ensure we don't error out
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if SEEK_DATA returns EOPNOTSUPP, on systems where this value
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is distinct from ENOTSUP. Generally both of these should be checked.
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Upstream-commit: 017877bd088284d515753d78b81ca6e6a88c1350
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Signed-off-by: Kamil Dudka <kdudka@redhat.com>
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---
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src/copy.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/src/copy.c b/src/copy.c
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index e3977cd..de8030d 100644
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--- a/src/copy.c
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+++ b/src/copy.c
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@@ -1246,7 +1246,7 @@ infer_scantype (int fd, struct stat const *sb,
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scan_inference->ext_start = lseek (fd, 0, SEEK_DATA);
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if (0 <= scan_inference->ext_start)
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return LSEEK_SCANTYPE;
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- else if (errno != EINVAL && errno != ENOTSUP)
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+ else if (errno != EINVAL && !is_ENOTSUP (errno))
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return errno == ENXIO ? LSEEK_SCANTYPE : ERROR_SCANTYPE;
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#endif
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--
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2.31.1
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From 1daf8c0fc9a5766c22b7ea84bea8c88c86a0c495 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?P=C3=A1draig=20Brady?= <P@draigBrady.com>
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Date: Sat, 8 May 2021 19:23:20 +0100
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Subject: [PATCH 11/12] copy: handle system security config issues with
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copy_file_range()
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* src/copy.c (sparse_copy): Upon EPERM from copy_file_range(),
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fall back to a standard copy, which will give a more accurate
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error as to whether the issue is with the source or destination.
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Also this will avoid the issue where seccomp or apparmor are
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not configured to handle copy_file_range(), in which case
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the fall back standard copy would succeed without issue.
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This specific issue with seccomp was noticed for example in:
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https://github.com/golang/go/issues/40900
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Upstream-commit: 2e66e1732fced7af20fa76c60e636d39a1767d48
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Signed-off-by: Kamil Dudka <kdudka@redhat.com>
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---
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src/copy.c | 9 +++++++++
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1 file changed, 9 insertions(+)
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diff --git a/src/copy.c b/src/copy.c
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index de8030d..62eec7b 100644
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--- a/src/copy.c
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+++ b/src/copy.c
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@@ -294,6 +294,15 @@ sparse_copy (int src_fd, int dest_fd, char *buf, size_t buf_size,
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|| errno == EINVAL || errno == EBADF
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|| errno == EXDEV || errno == ETXTBSY)
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break;
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+
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+ /* copy_file_range might not be enabled in seccomp filters,
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+ so retry with a standard copy. EPERM can also occur
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+ for immutable files, but that would only be in the edge case
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+ where the file is made immutable after creating/truncating,
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+ in which case the (more accurate) error is still shown. */
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+ if (errno == EPERM && *total_n_read == 0)
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+ break;
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+
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if (errno == EINTR)
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n_copied = 0;
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else
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--
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2.31.1
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From 42c9e598f61ba6bc27a615e39e40023a676a523b Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?P=C3=A1draig=20Brady?= <P@draigBrady.com>
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Date: Wed, 12 May 2021 23:47:38 +0100
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Subject: [PATCH 12/12] copy: disallow copy_file_range() on Linux kernels
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before 5.3
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copy_file_range() before Linux kernel release 5.3 had many issues,
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as described at https://lwn.net/Articles/789527/, which was
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referenced from https://lwn.net/Articles/846403/; a more general
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article discussing the generality of copy_file_range().
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Linux kernel 5.3 was released in September 2019, which is new enough
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that we need to actively avoid older kernels.
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* src/copy.c (functional_copy_file_range): A new function
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that returns false for Linux kernels before version 5.3.
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(sparse_copy): Call this new function to gate use of
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copy_file_range().
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Upstream-commit: ba5e6885d2c255648cddb87b4e795659c1990374
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Signed-off-by: Kamil Dudka <kdudka@redhat.com>
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---
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src/copy.c | 47 +++++++++++++++++++++++++++++++++++++++++++++--
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1 file changed, 45 insertions(+), 2 deletions(-)
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diff --git a/src/copy.c b/src/copy.c
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index 62eec7b..2e1699b 100644
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--- a/src/copy.c
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+++ b/src/copy.c
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@@ -21,6 +21,7 @@
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#include <assert.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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+#include <sys/utsname.h>
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#include <selinux/selinux.h>
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#if HAVE_HURD_H
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@@ -64,6 +65,7 @@
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#include "write-any-file.h"
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#include "areadlink.h"
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#include "yesno.h"
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+#include "xstrtol.h"
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#include "selinux.h"
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#if USE_XATTR
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@@ -244,6 +246,47 @@ create_hole (int fd, char const *name, bool punch_holes, off_t size)
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return true;
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}
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+/* copy_file_range() before Linux kernel release 5.3 had many issues,
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+ as described at https://lwn.net/Articles/789527/,
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+ so return FALSE for Linux kernels earlier than that.
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+ This function can be removed when such kernels (released before Sep 2019)
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+ are no longer a consideration. */
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+
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+static bool
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+functional_copy_file_range (void)
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+{
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+#ifdef __linux__
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+ static int version_allowed = -1;
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+
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+ if (version_allowed == -1)
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+ version_allowed = 0;
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+ else
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+ return version_allowed;
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+
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+ struct utsname name;
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+ if (uname (&name) == -1)
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+ return version_allowed;
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+
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+ char *p = name.release;
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+ uintmax_t ver[2] = {0, 0};
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+ size_t iver = 0;
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+
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+ do
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+ {
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+ strtol_error err = xstrtoumax (p, &p, 10, &ver[iver], NULL);
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+ if (err != LONGINT_OK || *p++ != '.')
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+ break;
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+ }
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+ while (++iver < ARRAY_CARDINALITY (ver));
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+
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+ version_allowed = (ver[0] > 5 || (ver[0] == 5 && ver[1] >= 3));
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+
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+ return version_allowed;
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+#else
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+ return true;
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+#endif
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+
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+}
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/* Copy the regular file open on SRC_FD/SRC_NAME to DST_FD/DST_NAME,
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honoring the MAKE_HOLES setting and using the BUF_SIZE-byte buffer
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@@ -266,9 +309,9 @@ sparse_copy (int src_fd, int dest_fd, char *buf, size_t buf_size,
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*last_write_made_hole = false;
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*total_n_read = 0;
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- /* If not looking for holes, use copy_file_range if available,
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+ /* If not looking for holes, use copy_file_range if functional,
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but don't use if reflink disallowed as that may be implicit. */
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- if ((! hole_size) && allow_reflink)
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+ if ((! hole_size) && allow_reflink && functional_copy_file_range ())
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while (max_n_read)
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{
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/* Copy at most COPY_MAX bytes at a time; this is min
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--
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2.31.1
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@ -1,7 +1,7 @@
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Summary: A set of basic GNU tools commonly used in shell scripts
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Name: coreutils
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Version: 8.32
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Release: 25%{?dist}
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Release: 26%{?dist}
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License: GPLv3+
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Url: https://www.gnu.org/software/coreutils/
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Source0: https://ftp.gnu.org/gnu/%{name}/%{name}-%{version}.tar.xz
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@ -308,6 +308,9 @@ rm -f $RPM_BUILD_ROOT%{_infodir}/dir
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%license COPYING
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%changelog
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* Mon May 17 2021 Kamil Dudka <kdudka@redhat.com> - 8.32-26
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- cp: pick additional copy_file_range()-related fixes from upstream
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* Mon May 03 2021 Kamil Dudka <kdudka@redhat.com> - 8.32-25
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- copy: ensure we enforce --reflink=never
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