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| author | Li Xiao Keng <lixiaokeng@huawei.com> | 2023-02-27 11:12:07 +0800 |
|---|---|---|
| committer | Jes Sorensen <jes@trained-monkey.org> | 2023-02-28 12:28:03 -0500 |
| commit | f1f3ef7d2de5e3a726c27b9f9bb20e270a100dab (patch) | |
| tree | ea76aad059160e45431a70d137c49096fc647c28 | |
| parent | d07e561810a2e33b667a8a9476edaff42eb119b9 (diff) | |
| download | mdadm-f1f3ef7d2de5e3a726c27b9f9bb20e270a100dab.tar.gz | |
Fix NULL dereference in super_by_fd
When we create 100 partitions (major is 259 not 254) in a raid device,
mdadm may coredump:
Core was generated by `/usr/sbin/mdadm --detail --export /dev/md1p7'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 __strlen_avx2_rtm () at ../sysdeps/x86_64/multiarch/strlen-avx2.S:74
74 VPCMPEQ (%rdi), %ymm0, %ymm1
(gdb) bt
#0 __strlen_avx2_rtm () at ../sysdeps/x86_64/multiarch/strlen-avx2.S:74
#1 0x00007fbb9a7e4139 in __strcpy_chk (dest=dest@entry=0x55d55d6a13ac "", src=0x0, destlen=destlen@entry=32) at strcpy_chk.c:28
#2 0x000055d55ba1766d in strcpy (__src=<optimized out>, __dest=0x55d55d6a13ac "") at /usr/include/bits/string_fortified.h:79
#3 super_by_fd (fd=fd@entry=3, subarrayp=subarrayp@entry=0x7fff44dfcc48) at util.c:1289
#4 0x000055d55ba273a6 in Detail (dev=0x7fff44dfef0b "/dev/md1p7", c=0x7fff44dfe440) at Detail.c:101
#5 0x000055d55ba0de61 in misc_list (c=<optimized out>, ss=<optimized out>, dump_directory=<optimized out>, ident=<optimized out>, devlist=<optimized out>) at mdadm.c:1959
#6 main (argc=<optimized out>, argv=<optimized out>) at mdadm.c:1629
The direct cause is fd2devnm returning NULL, so add a check.
Signed-off-by: Li Xiao Keng <lixiaokeng@huawei.com>
Signed-off-by: Wu Guang Hao <wuguanghao3@huawei.com>
Acked-by: Coly Li <colyli@suse.de>
Acked-by: Coly Li <colyli@suse.de <mailto:colyli@suse.de>>
Signed-off-by: Jes Sorensen <jes@trained-monkey.org>
| -rw-r--r-- | mapfile.c | 4 | ||||
| -rw-r--r-- | util.c | 7 |
2 files changed, 10 insertions, 1 deletions
@@ -292,6 +292,10 @@ struct map_ent *map_by_uuid(struct map_ent **map, int uuid[4]) struct map_ent *map_by_devnm(struct map_ent **map, char *devnm) { struct map_ent *mp; + + if (!devnm) + return NULL; + if (!*map) map_read(map); @@ -1160,6 +1160,11 @@ struct supertype *super_by_fd(int fd, char **subarrayp) int i; char *subarray = NULL; char container[32] = ""; + char *devnm = NULL; + + devnm = fd2devnm(fd); + if (!devnm) + return NULL; sra = sysfs_read(fd, NULL, GET_VERSION); @@ -1205,7 +1210,7 @@ struct supertype *super_by_fd(int fd, char **subarrayp) if (subarrayp) *subarrayp = subarray; strcpy(st->container_devnm, container); - strcpy(st->devnm, fd2devnm(fd)); + strncpy(st->devnm, devnm, MD_NAME_MAX - 1); } else free(subarray); |