diff options
Diffstat (limited to 'meta/recipes-extended/mdadm/files/0003-mdadm-Grow-Fix-use-after-close-bug-by-closing-after-.patch')
| -rw-r--r-- | meta/recipes-extended/mdadm/files/0003-mdadm-Grow-Fix-use-after-close-bug-by-closing-after-.patch | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/meta/recipes-extended/mdadm/files/0003-mdadm-Grow-Fix-use-after-close-bug-by-closing-after-.patch b/meta/recipes-extended/mdadm/files/0003-mdadm-Grow-Fix-use-after-close-bug-by-closing-after-.patch new file mode 100644 index 0000000000..a954ab027a --- /dev/null +++ b/meta/recipes-extended/mdadm/files/0003-mdadm-Grow-Fix-use-after-close-bug-by-closing-after-.patch @@ -0,0 +1,91 @@ +From bd064da1469a6a07331b076a0294a8c6c3c38526 Mon Sep 17 00:00:00 2001 +From: Logan Gunthorpe <logang@deltatee.com> +Date: Wed, 22 Jun 2022 14:25:09 -0600 +Subject: [PATCH 3/4] mdadm/Grow: Fix use after close bug by closing after fork + +The test 07reshape-grow fails most of the time. But it succeeds around +1 in 5 times. When it does succeed, it causes the tests to die because +mdadm has segfaulted. + +The segfault was caused by mdadm attempting to repoen a file +descriptor that was already closed. The backtrace of the segfault +was: + + #0 __strncmp_avx2 () at ../sysdeps/x86_64/multiarch/strcmp-avx2.S:101 + #1 0x000056146e31d44b in devnm2devid (devnm=0x0) at util.c:956 + #2 0x000056146e31dab4 in open_dev_flags (devnm=0x0, flags=0) + at util.c:1072 + #3 0x000056146e31db22 in open_dev (devnm=0x0) at util.c:1079 + #4 0x000056146e3202e8 in reopen_mddev (mdfd=4) at util.c:2244 + #5 0x000056146e329f36 in start_array (mdfd=4, + mddev=0x7ffc55342450 "/dev/md0", content=0x7ffc55342860, + st=0x56146fc78660, ident=0x7ffc55342f70, best=0x56146fc6f5d0, + bestcnt=10, chosen_drive=0, devices=0x56146fc706b0, okcnt=5, + sparecnt=0, rebuilding_cnt=0, journalcnt=0, c=0x7ffc55342e90, + clean=1, avail=0x56146fc78720 "\001\001\001\001\001", + start_partial_ok=0, err_ok=0, was_forced=0) + at Assemble.c:1206 + #6 0x000056146e32c36e in Assemble (st=0x56146fc78660, + mddev=0x7ffc55342450 "/dev/md0", ident=0x7ffc55342f70, + devlist=0x56146fc6e2d0, c=0x7ffc55342e90) + at Assemble.c:1914 + #7 0x000056146e312ac9 in main (argc=11, argv=0x7ffc55343238) + at mdadm.c:1510 + +The file descriptor was closed early in Grow_continue(). The noted commit +moved the close() call to close the fd above the fork which caused the +parent process to return with a closed fd. + +This meant reshape_array() and Grow_continue() would return in the parent +with the fd forked. The fd would eventually be passed to reopen_mddev() +which returned an unhandled NULL from fd2devnm() which would then be +dereferenced in devnm2devid. + +Fix this by moving the close() call below the fork. This appears to +fix the 07revert-grow test. While we're at it, switch to using +close_fd() to invalidate the file descriptor. + +Fixes: 77b72fa82813 ("mdadm/Grow: prevent md's fd from being occupied during delayed time") +Cc: Alex Wu <alexwu@synology.com> +Cc: BingJing Chang <bingjingc@synology.com> +Cc: Danny Shih <dannyshih@synology.com> +Cc: ChangSyun Peng <allenpeng@synology.com> +Signed-off-by: Logan Gunthorpe <logang@deltatee.com> +Acked-by: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com> +Signed-off-by: Jes Sorensen <jes@trained-monkey.org> + +Upstream-Status: Backport + +Reference to upstream patch: +https://git.kernel.org/pub/scm/utils/mdadm/mdadm.git/commit/?id=548e9b916f86 + +Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com> +--- + Grow.c | 4 +++- + 1 file changed, 3 insertions(+), 1 deletion(-) + +diff --git a/Grow.c b/Grow.c +index 9c6fc95..a8e4e83 100644 +--- a/Grow.c ++++ b/Grow.c +@@ -3501,7 +3501,6 @@ started: + return 0; + } + +- close(fd); + /* Now we just need to kick off the reshape and watch, while + * handling backups of the data... + * This is all done by a forked background process. +@@ -3522,6 +3521,9 @@ started: + break; + } + ++ /* Close unused file descriptor in the forked process */ ++ close_fd(&fd); ++ + /* If another array on the same devices is busy, the + * reshape will wait for them. This would mean that + * the first section that we suspend will stay suspended +-- +2.39.1 + |