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commit d755bba40f880c01ced8740a26fecc85534454b9
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Author: Siddhesh Poyarekar <siddhesh@redhat.com>
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Date: Wed Apr 3 10:56:45 2013 +0530
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Preserve errno across _PC_CHOWN_RESTRICTED call on XFS
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Fix BZ #15305.
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On kernel versions earlier than 2.6.29, the Linux kernel exported a
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sysctl called restrict_chown for xfs, which could be used to allow
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chown to users other than the owner. 2.6.29 removed this support,
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causing the open_not_cancel_2 to fail and thus modify errno. The fix
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is to save and restore errno so that the caller sees it as unmodified.
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Additionally, since the code to check the sysctl is not useful on
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newer kernels, we add an ifdef so that in future the code block gets
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rmeoved completely.
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diff --git glibc-2.17-c758a686/sysdeps/unix/sysv/linux/kernel-features.h glibc-2.17-c758a686/sysdeps/unix/sysv/linux/kernel-features.h
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index 8fdff7e..ccd4c59 100644
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--- glibc-2.17-c758a686/sysdeps/unix/sysv/linux/kernel-features.h
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+++ glibc-2.17-c758a686/sysdeps/unix/sysv/linux/kernel-features.h
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@@ -221,3 +221,9 @@
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#if defined __x86_64__ && __LINUX_KERNEL_VERSION >= 0x030100
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# define __ASSUME_GETCPU_SYSCALL 1
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#endif
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+
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+/* 2.6.29 removed the XFS restricted_chown sysctl, so it is pointless looking
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+ for it in newer kernels. */
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+#if __LINUX_KERNEL_VERSION >= 0x02061d
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+# define __ASSUME_XFS_RESTRICTED_CHOWN 1
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+#endif
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diff --git glibc-2.17-c758a686/sysdeps/unix/sysv/linux/pathconf.c glibc-2.17-c758a686/sysdeps/unix/sysv/linux/pathconf.c
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index de91a45..723d234 100644
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--- glibc-2.17-c758a686/sysdeps/unix/sysv/linux/pathconf.c
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+++ glibc-2.17-c758a686/sysdeps/unix/sysv/linux/pathconf.c
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@@ -289,11 +289,16 @@ __statfs_chown_restricted (int result, const struct statfs *fsbuf)
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return -1;
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}
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+#if __ASSUME_XFS_RESTRICTED_CHOWN
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+ return 1;
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+#else
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int fd;
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+ int save_errno;
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long int retval = 1;
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switch (fsbuf->f_type)
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{
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case XFS_SUPER_MAGIC:
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+ save_errno = errno;
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/* Read the value from /proc/sys/fs/xfs/restrict_chown. If we cannot
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read it default to assume the restriction is in place. */
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fd = open_not_cancel_2 ("/proc/sys/fs/xfs/restrict_chown", O_RDONLY);
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@@ -306,6 +311,7 @@ __statfs_chown_restricted (int result, const struct statfs *fsbuf)
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close_not_cancel_no_status (fd);
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}
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+ __set_errno (save_errno);
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break;
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default:
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@@ -313,4 +319,5 @@ __statfs_chown_restricted (int result, const struct statfs *fsbuf)
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}
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return retval;
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+#endif
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}
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