projects / linux-seccomp.git / blame
| Commit | Line | Data |
|---|---|---|
| 8befd5cc MG |
1 | .TH "seccomp_merge" 3 "28 September 2012" "paul@paul-moore.com" "libseccomp Documentation" |
| 2 | .\" ////////////////////////////////////////////////////////////////////////// | |
| 3 | .SH NAME | |
| 4 | .\" ////////////////////////////////////////////////////////////////////////// | |
| 5 | seccomp_merge \- Merge two seccomp filters | |
| 6 | .\" ////////////////////////////////////////////////////////////////////////// | |
| 7 | .SH SYNOPSIS | |
| 8 | .\" ////////////////////////////////////////////////////////////////////////// | |
| 9 | .nf | |
| 10 | .B #include <seccomp.h> | |
| 11 | .sp | |
| 12 | .B typedef void * scmp_filter_ctx; | |
| 13 | .sp | |
| 14 | .BI "int seccomp_merge(scmp_filter_ctx " dst ", scmp_filter_ctx " src ");" | |
| 15 | .sp | |
| 16 | Link with \fI\-lseccomp\fP. | |
| 17 | .fi | |
| 18 | .\" ////////////////////////////////////////////////////////////////////////// | |
| 19 | .SH DESCRIPTION | |
| 20 | .\" ////////////////////////////////////////////////////////////////////////// | |
| 21 | .P | |
| 22 | The | |
| 23 | .BR seccomp_merge () | |
| 24 | function merges the seccomp filter in | |
| 25 | .I src | |
| 26 | with the filter in | |
| 27 | .I dst | |
| 28 | and stores the resulting in the | |
| 29 | .I dst | |
| 30 | filter. If successfull, the | |
| 31 | .I src | |
| 32 | seccomp filter is released and all internal memory assocated with the filter | |
| 33 | is freed; there is no need to call | |
| 34 | .BR seccomp_release (3) | |
| 35 | on | |
| 36 | .I src | |
| 37 | and the caller should discard any references to the filter. | |
| 38 | .P | |
| 39 | In order to merge two seccomp filters, both filters must have the same | |
| 40 | attribute values and no overlapping architectures. | |
| 41 | .\" ////////////////////////////////////////////////////////////////////////// | |
| 42 | .SH RETURN VALUE | |
| 43 | .\" ////////////////////////////////////////////////////////////////////////// | |
| 44 | Returns zero on success and negative values on failure. | |
| 45 | .\" ////////////////////////////////////////////////////////////////////////// | |
| 46 | .SH EXAMPLES | |
| 47 | .\" ////////////////////////////////////////////////////////////////////////// | |
| 48 | .nf | |
| 49 | #include <seccomp.h> | |
| 50 | ||
| 51 | int main(int argc, char *argv[]) | |
| 52 | { | |
| 53 | int rc = \-1; | |
| 54 | scmp_filter_ctx ctx_32, ctx_64; | |
| 55 | ||
| 56 | ctx_32 = seccomp_init(SCMP_ACT_KILL); | |
| 57 | if (ctx_32 == NULL) | |
| 58 | goto out_all; | |
| 59 | ctx_64 = seccomp_init(SCMP_ACT_KILL); | |
| 60 | if (ctx_64 == NULL) | |
| 61 | goto out_all; | |
| 62 | ||
| 63 | if (seccomp_arch_exist(ctx_32, SCMP_ARCH_X86) == \-EEXIST) { | |
| 64 | rc = seccomp_arch_add(ctx_32, SCMP_ARCH_X86); | |
| 65 | if (rc != 0) | |
| 66 | goto out_all; | |
| 67 | rc = seccomp_arch_remove(ctx_32, SCMP_ARCH_NATIVE); | |
| 68 | if (rc != 0) | |
| 69 | goto out_all; | |
| 70 | } | |
| 71 | if (seccomp_arch_exist(ctx_64, SCMP_ARCH_X86_64) == \-EEXIST) { | |
| 72 | rc = seccomp_arch_add(ctx_64, SCMP_ARCH_X86_64); | |
| 73 | if (rc != 0) | |
| 74 | goto out_all; | |
| 75 | rc = seccomp_arch_remove(ctx_64, SCMP_ARCH_NATIVE); | |
| 76 | if (rc != 0) | |
| 77 | goto out_all; | |
| 78 | } | |
| 79 | ||
| 80 | /* ... */ | |
| 81 | ||
| 82 | rc = seccomp_merge(ctx_64, ctx_32); | |
| 83 | if (rc != 0) | |
| 84 | goto out_all; | |
| 85 | ||
| 86 | /* NOTE: the 'ctx_32' filter is no longer valid at this point */ | |
| 87 | ||
| 88 | /* ... */ | |
| 89 | ||
| 90 | out: | |
| 91 | seccomp_release(ctx_64); | |
| 92 | return \-rc; | |
| 93 | out_all: | |
| 94 | seccomp_release(ctx_32); | |
| 95 | goto out; | |
| 96 | } | |
| 97 | .fi | |
| 98 | .\" ////////////////////////////////////////////////////////////////////////// | |
| 99 | .SH NOTES | |
| 100 | .\" ////////////////////////////////////////////////////////////////////////// | |
| 101 | .P | |
| 102 | While the seccomp filter can be generated independent of the kernel, kernel | |
| 103 | support is required to load and enforce the seccomp filter generated by | |
| 104 | libseccomp. | |
| 105 | .P | |
| 106 | The libseccomp project site, with more information and the source code | |
| 107 | repository, can be found at https://github.com/seccomp/libseccomp. This tool, | |
| 108 | as well as the libseccomp library, is currently under development, please | |
| 109 | report any bugs at the project site or directly to the author. | |
| 110 | .\" ////////////////////////////////////////////////////////////////////////// | |
| 111 | .SH AUTHOR | |
| 112 | .\" ////////////////////////////////////////////////////////////////////////// | |
| 113 | Paul Moore <paul@paul-moore.com> | |
| 114 | .\" ////////////////////////////////////////////////////////////////////////// | |
| 115 | .SH SEE ALSO | |
| 116 | .\" ////////////////////////////////////////////////////////////////////////// | |
| 117 | .BR seccomp_init (3), | |
| 118 | .BR seccomp_reset (3), | |
| 119 | .BR seccomp_arch_add (3), | |
| 120 | .BR seccomp_arch_remove (3), | |
| 121 | .BR seccomp_attr_get (3), | |
| 122 | .BR seccomp_attr_set (3) |