From e604a5e4bb61267c58e6b6179209efe74ab5f675 Mon Sep 17 00:00:00 2001 From: Xiaoming Ni Date: Mon, 4 Jan 2021 12:07:38 +0800 Subject: setrlimit/getrlimit: Use __nonnull to avoid null pointer Add __nonnull((2)) to the setrlimit()/getrlimit() function declaration to avoid null pointer access. ----- v2 According to the suggestions of the Adhemerval Zanella and Zack Weinberg: use __nonnull() to check null pointers in the compilation phase. do not add pointer check code to setrlimit()/getrlimit(). The validity of the "resource" parameter is checked in the syscall. v1 https://public-inbox.org/libc-alpha/20201230114131.47589-1-nixiaoming@huawei.com/ ----- Reviewed-by: Adhemerval Zanella --- include/sys/resource.h | 4 ++-- resource/sys/resource.h | 14 ++++++++------ 2 files changed, 10 insertions(+), 8 deletions(-) diff --git a/include/sys/resource.h b/include/sys/resource.h index 2235b02..21d3908 100644 --- a/include/sys/resource.h +++ b/include/sys/resource.h @@ -126,13 +126,13 @@ libc_hidden_proto (__getrlimit64); /* Now define the internal interfaces. */ extern int __getrlimit (enum __rlimit_resource __resource, - struct rlimit *__rlimits); + struct rlimit *__rlimits) __nonnull ((2)); libc_hidden_proto (__getrlimit) extern int __getrusage (enum __rusage_who __who, struct rusage *__usage) attribute_hidden; extern int __setrlimit (enum __rlimit_resource __resource, - const struct rlimit *__rlimits); + const struct rlimit *__rlimits) __nonnull ((2)); libc_hidden_proto (__setrlimit); #if __TIMESIZE == 64 diff --git a/resource/sys/resource.h b/resource/sys/resource.h index 936a5ca..d30379d 100644 --- a/resource/sys/resource.h +++ b/resource/sys/resource.h @@ -48,18 +48,19 @@ typedef int __priority_which_t; Returns 0 if successful, -1 if not (and sets errno). */ #ifndef __USE_FILE_OFFSET64 extern int getrlimit (__rlimit_resource_t __resource, - struct rlimit *__rlimits) __THROW; + struct rlimit *__rlimits) __THROW __nonnull ((2)); #else # ifdef __REDIRECT_NTH extern int __REDIRECT_NTH (getrlimit, (__rlimit_resource_t __resource, - struct rlimit *__rlimits), getrlimit64); + struct rlimit *__rlimits), getrlimit64) + __nonnull ((2)); # else # define getrlimit getrlimit64 # endif #endif #ifdef __USE_LARGEFILE64 extern int getrlimit64 (__rlimit_resource_t __resource, - struct rlimit64 *__rlimits) __THROW; + struct rlimit64 *__rlimits) __THROW __nonnull ((2)); #endif /* Set the soft and hard limits for RESOURCE to *RLIMITS. @@ -67,19 +68,20 @@ extern int getrlimit64 (__rlimit_resource_t __resource, Return 0 if successful, -1 if not (and sets errno). */ #ifndef __USE_FILE_OFFSET64 extern int setrlimit (__rlimit_resource_t __resource, - const struct rlimit *__rlimits) __THROW; + const struct rlimit *__rlimits) __THROW __nonnull ((2)); #else # ifdef __REDIRECT_NTH extern int __REDIRECT_NTH (setrlimit, (__rlimit_resource_t __resource, const struct rlimit *__rlimits), - setrlimit64); + setrlimit64) __nonnull ((2)); # else # define setrlimit setrlimit64 # endif #endif #ifdef __USE_LARGEFILE64 extern int setrlimit64 (__rlimit_resource_t __resource, - const struct rlimit64 *__rlimits) __THROW; + const struct rlimit64 *__rlimits) __THROW + __nonnull ((2)); #endif /* Return resource usage information on process indicated by WHO -- cgit v1.1