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setrlimit/getrlimit: Use __nonnull to avoid null pointer

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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  <adhemerval.zanella@linaro.org>
This commit is contained in:
Xiaoming Ni 2021-01-04 12:07:38 +08:00 committed by Adhemerval Zanella
parent 7960c5eea9
commit e604a5e4bb
2 changed files with 10 additions and 8 deletions
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4
include/sys/resource.h
View File

@ -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

14
resource/sys/resource.h
View File

@ -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