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Merge tag 'ipe-pr-20251202' of git://git.kernel.org/pub/scm/linux/kernel/git/wufan/ipe

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Pull IPE udates from Fan Wu:
 "The primary change is the addition of support for the AT_EXECVE_CHECK
  flag. This allows interpreters to signal the kernel to perform IPE
  security checks on script files before execution, extending IPE
  enforcement to indirectly executed scripts.

  Update documentation for it, and also fix a comment"

* tag 'ipe-pr-20251202' of git://git.kernel.org/pub/scm/linux/kernel/git/wufan/ipe:
  ipe: Update documentation for script enforcement
  ipe: Add AT_EXECVE_CHECK support for script enforcement
  ipe: Drop a duplicated CONFIG_ prefix in the ifdeffery
This commit is contained in:
Linus Torvalds
2025-12-03 11:19:34 -08:00
parent 777f817160 d7ba853c0e
commit c832183148
5 changed files with 47 additions and 4 deletions
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1
security/ipe/audit.c
View File

@@ -46,6 +46,7 @@ static const char *const audit_op_names[__IPE_OP_MAX + 1] = {
static const char *const audit_hook_names[__IPE_HOOK_MAX] = {
"BPRM_CHECK",
"BPRM_CREDS_FOR_EXEC",
"MMAP",
"MPROTECT",
"KERNEL_READ",

29
security/ipe/hooks.c
View File

@@ -35,6 +35,33 @@ int ipe_bprm_check_security(struct linux_binprm *bprm)
return ipe_evaluate_event(&ctx);
}
/**
* ipe_bprm_creds_for_exec() - ipe security hook function for bprm creds check.
* @bprm: Supplies a pointer to a linux_binprm structure to source the file
* being evaluated.
*
* This LSM hook is called when userspace signals the kernel to check a file
* for execution through the execveat syscall with the AT_EXECVE_CHECK flag.
* The hook triggers IPE policy evaluation on the script file and returns
* the policy decision to userspace. The userspace program receives the
* return code and can decide whether to proceed with script execution.
*
* Return:
* * %0 - Success
* * %-EACCES - Did not pass IPE policy
*/
int ipe_bprm_creds_for_exec(struct linux_binprm *bprm)
{
struct ipe_eval_ctx ctx = IPE_EVAL_CTX_INIT;
if (!bprm->is_check)
return 0;
ipe_build_eval_ctx(&ctx, bprm->file, IPE_OP_EXEC,
IPE_HOOK_BPRM_CREDS_FOR_EXEC);
return ipe_evaluate_event(&ctx);
}
/**
* ipe_mmap_file() - ipe security hook function for mmap check.
* @f: File being mmap'd. Can be NULL in the case of anonymous memory.
@@ -312,4 +339,4 @@ int ipe_inode_setintegrity(const struct inode *inode,
return -EINVAL;
}
#endif /* CONFIG_CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG */
#endif /* CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG */

3
security/ipe/hooks.h
View File

@@ -13,6 +13,7 @@
enum ipe_hook_type {
IPE_HOOK_BPRM_CHECK = 0,
IPE_HOOK_BPRM_CREDS_FOR_EXEC,
IPE_HOOK_MMAP,
IPE_HOOK_MPROTECT,
IPE_HOOK_KERNEL_READ,
@@ -24,6 +25,8 @@ enum ipe_hook_type {
int ipe_bprm_check_security(struct linux_binprm *bprm);
int ipe_bprm_creds_for_exec(struct linux_binprm *bprm);
int ipe_mmap_file(struct file *f, unsigned long reqprot, unsigned long prot,
unsigned long flags);

1
security/ipe/ipe.c
View File

@@ -47,6 +47,7 @@ struct ipe_inode *ipe_inode(const struct inode *inode)
static struct security_hook_list ipe_hooks[] __ro_after_init = {
LSM_HOOK_INIT(bprm_check_security, ipe_bprm_check_security),
LSM_HOOK_INIT(bprm_creds_for_exec, ipe_bprm_creds_for_exec),
LSM_HOOK_INIT(mmap_file, ipe_mmap_file),
LSM_HOOK_INIT(file_mprotect, ipe_file_mprotect),
LSM_HOOK_INIT(kernel_read_file, ipe_kernel_read_file),