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Fix #253: use reentrant getmntent_r() API

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When iterating over the system fstab file to call fsck, Finit calls the
helper function ismnt(), which opens /proc/mounts to make sure mounted
file systems are not fsck'ed.  Both the main function and ismnt() used
the same non-reentrant getmntent() API which caused ismnt() to set the
fstab pointer for the first out of whack.

This change replaces getmntent() in the two critical functions with the
getmntent_r() API instead.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This commit is contained in:
Joachim Wiberg committed 2022-05-01 21:43:13 +02:00
1 parent 1015124530
commit d6c55282ef
3 files changed
+9 -4
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configure.ac
+1 -1
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@@ -34,7 +34,7 @@ AC_PROG_MKDIR_P
# Configuration.
AC_HEADER_STDC
AC_CHECK_HEADERS([termios.h sys/ioctl.h mntent.h sys/sysmacros.h])
AC_CHECK_FUNCS([strstr getopt getmntent])
AC_CHECK_FUNCS([strstr getopt getmntent getmntent_r])
# Check for uint[8,16,32]_t
AC_TYPE_UINT8_T