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From 025eb38eeb31ca07c98d2e41ce90d05016afc0f4 Mon Sep 17 00:00:00 2001
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From: Frantisek Sumsal <fsumsal@redhat.com>
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Date: Mon, 14 Jan 2019 11:20:52 +0100
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Subject: [PATCH] copy: only check for traversing mount points on directories
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This fixes the copy routines on overlay filesystem, which typically
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returns the underlying st_dev for files, symlinks, etc.
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The value of st_dev is guaranteed to be the same for directories, so
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checking it on directories only fixes this code on overlay filesystem
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and still keeps it from traversing mount points (which was the original
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intent.)
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There's a small side effect here, by which regular (non-directory) files
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with bind mounts will be copied by the new logic (while they were
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skipped by the previous logic.)
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Tested: ./build/test-copy with an overlay on /tmp.
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Cherry-picked from: ef202b848bb6635dec17d3ec0041b04cd2301bed
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---
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src/shared/copy.c | 11 +++++------
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1 file changed, 5 insertions(+), 6 deletions(-)
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diff --git a/src/shared/copy.c b/src/shared/copy.c
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index 2a0cb28080..0a7ee47f99 100644
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--- a/src/shared/copy.c
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+++ b/src/shared/copy.c
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@@ -271,13 +271,12 @@ static int fd_copy_directory(
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continue;
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}
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- if (buf.st_dev != original_device)
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- continue;
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-
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- if (S_ISREG(buf.st_mode))
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- q = fd_copy_regular(dirfd(d), de->d_name, &buf, fdt, de->d_name);
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- else if (S_ISDIR(buf.st_mode))
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+ if (S_ISDIR(buf.st_mode)) {
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+ if (buf.st_dev != original_device)
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+ continue;
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q = fd_copy_directory(dirfd(d), de->d_name, &buf, fdt, de->d_name, original_device, merge);
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+ } else if (S_ISREG(buf.st_mode))
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+ q = fd_copy_regular(dirfd(d), de->d_name, &buf, fdt, de->d_name);
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else if (S_ISLNK(buf.st_mode))
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q = fd_copy_symlink(dirfd(d), de->d_name, &buf, fdt, de->d_name);
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else if (S_ISFIFO(buf.st_mode))
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