seccomp_arch_add(3)

1seccomp_arch_add(3)        libseccomp Documentation        seccomp_arch_add(3)
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NAME

6       seccomp_arch_add,    seccomp_arch_remove,    seccomp_arch_exist,   sec‐
7       comp_arch_native - Manage seccomp filter architectures
8

SYNOPSIS

10       #include <seccomp.h>
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12       typedef void * scmp_filter_ctx;
13
14       #define SCMP_ARCH_NATIVE
15       #define SCMP_ARCH_X86
16       #define SCMP_ARCH_X86_64
17
18       uint32_t seccomp_arch_resolve_name(const char *arch_name);
19       uint32_t seccomp_arch_native();
20       int seccomp_arch_exist(const scmp_filter_ctx ctx, uint32_t arch_token);
21       int seccomp_arch_add(scmp_filter_ctx ctx, uint32_t arch_token);
22       int seccomp_arch_remove(scmp_filter_ctx ctx, uint32_t arch_token);
23
24       Link with -lseccomp.
25

DESCRIPTION

27       The seccomp_arch_exist() function tests to see if a given  architecture
28       has  been  added  to  the  seccomp  filter  in  ctx  ,  where  the sec‐
29       comp_arch_add() and seccomp_arch_remove() add and remove, respectively,
30       architectures  from  the  seccomp  filter.  In all three functions, the
31       architecture values given  in  arch_token  should  be  the  SCMP_ARCH_*
32       defined  constants; with the SCMP_ARCH_NATIVE constant always referring
33       to the native compiled architecture.  The  seccomp_arch_native()  func‐
34       tion  returns  the system's architecture such that it will match one of
35       the SCMP_ARCH_* constants.  While the seccomp_arch_resolve_name() func‐
36       tion  also  returns  a SCMP_ARCH_* constant, the returned token matches
37       the name of the architecture passed as an argument to the function.
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39       When a seccomp filter is initialized with the call  to  seccomp_init(3)
40       the native architecture is automatically added to the filter.
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42       While it is possible to remove all architectures from a filter, most of
43       the libseccomp APIs will fail if the filter does not contain  at  least
44       one architecture.
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46       When  adding  a  new  architecture  to an existing filter, the existing
47       rules will not be added to the new architecture.  However, rules  added
48       after adding the new architecture will be added to all of the architec‐
49       tures in the filter.
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RETURN VALUE

52       The seccomp_arch_add() and seccomp_arch_remove() functions return  zero
53       on success, negative errno values on failure.  The seccomp_arch_exist()
54       function returns zero if the architecture exists, -EEXIST  if  it  does
55       not, and other negative errno values on failure.
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EXAMPLES

58       #include <seccomp.h>
59
60       int main(int argc, char *argv[])
61       {
62            int rc = -1;
63            scmp_filter_ctx ctx;
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65            ctx = seccomp_init(SCMP_ACT_KILL);
66            if (ctx == NULL)
67                 goto out;
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69            if (seccomp_arch_exist(ctx, SCMP_ARCH_X86) == -EEXIST) {
70                 rc = seccomp_arch_add(ctx, SCMP_ARCH_X86);
71                 if (rc != 0)
72                      goto out_all;
73                 rc = seccomp_arch_remove(ctx, SCMP_ARCH_NATIVE);
74                 if (rc != 0)
75                      goto out_all;
76            }
77
78            /* ... */
79
80       out:
81            seccomp_release(ctx);
82            return -rc;
83       }
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NOTES

86       While  the  seccomp  filter can be generated independent of the kernel,
87       kernel support is required to load and enforce the seccomp filter  gen‐
88       erated by libseccomp.
89
90       The  libseccomp project site, with more information and the source code
91       repository,  can  be  found  at  https://github.com/seccomp/libseccomp.
92       This tool, as well as the libseccomp library, is currently under devel‐
93       opment, please report any bugs at the project site or directly  to  the
94       author.
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AUTHOR

97       Paul Moore <paul@paul-moore.com>
98