grsecurity forums

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grsec: (root:U:/usr/bin/mysql) denied access to hidden file pipe:/[41951261] by /usr/bin/mysql[mysql:18146] uid/euid:0/0 gid/egid:0/0, parent /var/spool/muskul2/update[update:5485] uid/euid:0/0 gid/egid:0/0

how to create rule for that? Lines are like echo 123|mysql -e Number 41951261 every time is diffirent

As a workaround, does changing "/ h" for that subject to "/" fix the problem?

-Brad

spender wrote:As a workaround, does changing "/ h" for that subject to "/" fix the problem?

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subject /usr/bin/mysql o {
        /                               r
...
}

works for me. Trying "/" without r...

voron wrote:Trying "/" without r...

not working.
with / h got

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OS error code   2:  No such file or directory

, with / got

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OS error code  13:  Permission denied

and in dmesg

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[1360424.173566] grsec:(root:U:/usr/bin/mysql) denied open of pipe:/[112411866] for reading by /usr/bin/mysql[mysql:24789] uid/euid:0/0 gid/egid:0/0, parent /var/spool/muskul2/update[update:29102] uid/euid:0/0 gid/egid:0/0

mysql string load data local infile '/dev/stdin' replace into table....

Which version of linux and grsecurity are you using?

-Brad

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cat /etc/*-release
Gentoo Base System version 1.12.0_pre17

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uname -rpm
2.6.16.9-grsec x86_64 AMD Sempron(tm) Processor 2800+

vanilla source from kernel.org
grsecurity-2.1.9-2.6.16.12-200605012018.patch
gradm-2.1.9-200602141850 from gentoo portage

in learn for mysql I have lines like that

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        /[123628]                       r
        /[176549]                       r
        /[229654]                       r
        /[287336]                       r
        /[61052]                        r
        /[621647]                       r
        /[672684]                       r
        /[717276]                       r

maybe globbing like /[*] r will work?

I've updated the 2.4.32 patch in ~spender which should resolve this issue. Since filesystems like pipefs, shmfs, and sockfs aren't real filesystems, the RBAC system shouldn't deal with them. The latest patch corrects that. Can you give it a try and verify that it fixes the problem?

-Brad

spender wrote:I've updated the 2.4.32 patch in ~spender which should resolve this issue. Can you give it a try and verify that it fixes the problem?

my server is

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uname -mr
2.6.16.9-grsec x86_64

,so I need 2.6 patch

The latest 2.6.17.3 patch in ~spender includes the peudofs fix. Let me know if it doesn't correct your problem.

-Brad