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seccomp_attr_get(3) [centos man page]

seccomp_attr_set(3)					     libseccomp Documentation					       seccomp_attr_set(3)

NAME
seccomp_attr_set, seccomp_attr_get - Manage the seccomp filter attributes SYNOPSIS
#include <seccomp.h> typedef void * scmp_filter_ctx; enum scmp_filter_attr; int seccomp_attr_set(scmp_filter_ctx ctx, enum scmp_filter_attr attr, uint32_t value); int seccomp_attr_get(scmp_filter_ctx ctx, enum scmp_filter_attr attr, uint32_t *value); Link with -lseccomp. DESCRIPTION
The seccomp_attr_set() function sets the different seccomp filter attributes while the seccomp_attr_get() function fetches the filter attributes. The seccomp filter attributes are tunable values that affect how the library behaves when generating and loading the seccomp filter into the kernel. The attributes are reset to their default values whenever the filter is initialized or reset via seccomp_fil- ter_init(3) or seccomp_filter_reset(3). The filter context ctx is the value returned by the call to seccomp_init(3). Valid attr values are as follows: SCMP_FLTATR_ACT_DEFAULT The default filter action as specified in the call to seccomp_filter_init(3) or seccomp_filter_reset(3). This attribute is read- only. SCMP_FLTATR_ACT_BADARCH The filter action taken when the loaded filter does not match the architecture of the executing application. Defaults to the SCMP_ACT_KILL action. SCMP_FLTATR_CTL_NNP A flag to specify if the NO_NEW_PRIVS functionality should be enabled before loading the seccomp filter into the kernel. If set to off ( value == 0) then loading the seccomp filter into the kernel will fail if CAP_SYS_ADMIN is not set. Defaults to on ( value == 1). RETURN VALUE
Returns zero on success, negative errno values on failure. EXAMPLES
#include <seccomp.h> int main(int argc, char *argv[]) { int rc = -1; scmp_filter_ctx ctx; ctx = seccomp_init(SCMP_ACT_ALLOW); if (ctx == NULL) goto out; /* ... */ rc = seccomp_attr_set(ctx, SCMP_FLTATR_ACT_BADARCH, SCMP_ACT_TRAP); if (rc < 0) goto out; /* ... */ out: seccomp_release(ctx); return -rc; } NOTES
While the seccomp filter can be generated independent of the kernel, kernel support is required to load and enforce the seccomp filter gen- erated by libseccomp. The libseccomp project site, with more information and the source code repository, can be found at http://libseccomp.sf.net. This library is currently under development, please report any bugs at the project site or directly to the author. AUTHOR
Paul Moore <paul@paul-moore.com> SEE ALSO
seccomp_init(3), seccomp_reset(3), seccomp_load(3) paul@paul-moore.com 25 July 2012 seccomp_attr_set(3)

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seccomp_merge(3)					     libseccomp Documentation						  seccomp_merge(3)

NAME
seccomp_merge - Merge two seccomp filters SYNOPSIS
#include <seccomp.h> typedef void * scmp_filter_ctx; int seccomp_merge(scmp_filter_ctx dst, scmp_filter_ctx src); Link with -lseccomp. DESCRIPTION
The seccomp_merge() function merges the seccomp filter in src with the filter in dst and stores the resulting in the dst filter. If suc- cessfull, the src seccomp filter is released and all internal memory assocated with the filter is freed; there is no need to call sec- comp_release(3) on src and the caller should discard any references to the filter. In order to merge two seccomp filters, both filters must have the same attribute values and no overlapping architectures. RETURN VALUE
Returns zero on success and negative values on failure. EXAMPLES
#include <seccomp.h> int main(int argc, char *argv[]) { int rc = -1; scmp_filter_ctx ctx_32, ctx_64; ctx_32 = seccomp_init(SCMP_ACT_KILL); if (ctx_32 == NULL) goto out_all; ctx_64 = seccomp_init(SCMP_ACT_KILL); if (ctx_64 == NULL) goto out_all; if (seccomp_arch_exist(ctx_32, SCMP_ARCH_X86) == -EEXIST) { rc = seccomp_arch_add(ctx_32, SCMP_ARCH_X86); if (rc != 0) goto out_all; rc = seccomp_arch_remove(ctx_32, SCMP_ARCH_NATIVE); if (rc != 0) goto out_all; } if (seccomp_arch_exist(ctx_64, SCMP_ARCH_X86_64) == -EEXIST) { rc = seccomp_arch_add(ctx_64, SCMP_ARCH_X86_64); if (rc != 0) goto out_all; rc = seccomp_arch_remove(ctx_64, SCMP_ARCH_NATIVE); if (rc != 0) goto out_all; } /* ... */ rc = seccomp_merge(ctx_64, ctx_32); if (rc != 0) goto out_all; /* NOTE: the 'ctx_32' filter is no longer valid at this point */ /* ... */ out: seccomp_release(ctx_64); return -rc; out_all: seccomp_release(ctx_32); goto out; } NOTES
While the seccomp filter can be generated independent of the kernel, kernel support is required to load and enforce the seccomp filter gen- erated by libseccomp. The libseccomp project site, with more information and the source code repository, can be found at http://libseccomp.sf.net. This library is currently under development, please report any bugs at the project site or directly to the author. AUTHOR
Paul Moore <paul@paul-moore.com> SEE ALSO
seccomp_init(3), seccomp_reset(3), seccomp_arch_add(3), seccomp_arch_remove(3), seccomp_attr_get(3), seccomp_attr_set(3) paul@paul-moore.com 28 September 2012 seccomp_merge(3)
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