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Description of problem:
If the path to be exported is long, or contains multi-byte characters, the export_hash() function may return a negative value, rather than a hash value within the correct range (0-1021). This may lead to a segfault due to accessing a memory location outside of the hash.
Version-Release number of selected component (if applicable):
nfs-utils-1.2.3-75.el6.x86_64
How reproducible:
easy
Steps to Reproduce:
# mkdir -p /exports/Общедоступные
# echo "/exports/Общедоступные 1.2.3.4(rw)" >> /etc/exports
# exportfs -arv
Actual results:
# exportfs -arv
Segmentation fault (core dumped)
Expected results:
no segfault
Additional info:
This is fixed in the following upstream commit:
commit a16f4a13677d13b0aae9327a3b9e8414470b7927
Author: Ivan Romanov <drizt>
Date: 2012-10-15 12:41:36 -0400
Exportfs crashes with long path
Acked-by: Bruce Fields <bfields>
Signed-off-by: Steve Dickson <steved>
diff --git a/support/export/export.c b/support/export/export.c
index 4fda30a..0257903 100644
--- a/support/export/export.c
+++ b/support/export/export.c
@@ -357,7 +357,7 @@ strtoint(char *str)
static int
export_hash(char *str)
{
- int num = strtoint(str);
+ unsigned int num = strtoint(str);
return num % HASH_TABLE_SIZE;
}
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2018:1855
Description of problem: If the path to be exported is long, or contains multi-byte characters, the export_hash() function may return a negative value, rather than a hash value within the correct range (0-1021). This may lead to a segfault due to accessing a memory location outside of the hash. Version-Release number of selected component (if applicable): nfs-utils-1.2.3-75.el6.x86_64 How reproducible: easy Steps to Reproduce: # mkdir -p /exports/Общедоступные # echo "/exports/Общедоступные 1.2.3.4(rw)" >> /etc/exports # exportfs -arv Actual results: # exportfs -arv Segmentation fault (core dumped) Expected results: no segfault Additional info: This is fixed in the following upstream commit: commit a16f4a13677d13b0aae9327a3b9e8414470b7927 Author: Ivan Romanov <drizt> Date: 2012-10-15 12:41:36 -0400 Exportfs crashes with long path Acked-by: Bruce Fields <bfields> Signed-off-by: Steve Dickson <steved> diff --git a/support/export/export.c b/support/export/export.c index 4fda30a..0257903 100644 --- a/support/export/export.c +++ b/support/export/export.c @@ -357,7 +357,7 @@ strtoint(char *str) static int export_hash(char *str) { - int num = strtoint(str); + unsigned int num = strtoint(str); return num % HASH_TABLE_SIZE; }