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Linux/kernel/ksyms_common.c

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Diff markup

Differences between /kernel/ksyms_common.c (Version linux-6.11.5) and /kernel/ksyms_common.c (Version linux-5.18.19)


  1 // SPDX-License-Identifier: GPL-2.0-only            1 
  2 /*                                                
  3  * ksyms_common.c: A split of kernel/kallsyms.    
  4  * Contains a few generic function definations    
  5  */                                               
  6 #include <linux/kallsyms.h>                       
  7 #include <linux/security.h>                       
  8                                                   
  9 static inline int kallsyms_for_perf(void)         
 10 {                                                 
 11 #ifdef CONFIG_PERF_EVENTS                         
 12         extern int sysctl_perf_event_paranoid;    
 13                                                   
 14         if (sysctl_perf_event_paranoid <= 1)      
 15                 return 1;                         
 16 #endif                                            
 17         return 0;                                 
 18 }                                                 
 19                                                   
 20 /*                                                
 21  * We show kallsyms information even to normal    
 22  * kernel profiling and are explicitly not par    
 23  * is clear, and sysctl_perf_event_paranoid is    
 24  *                                                
 25  * Otherwise, require CAP_SYSLOG (assuming kpt    
 26  * block even that).                              
 27  */                                               
 28 bool kallsyms_show_value(const struct cred *cr    
 29 {                                                 
 30         switch (kptr_restrict) {                  
 31         case 0:                                   
 32                 if (kallsyms_for_perf())          
 33                         return true;              
 34                 fallthrough;                      
 35         case 1:                                   
 36                 if (security_capable(cred, &in    
 37                                      CAP_OPT_N    
 38                         return true;              
 39                 fallthrough;                      
 40         default:                                  
 41                 return false;                     
 42         }                                         
 43 }                                                 
 44                                                   

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