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update(syscall_buffer_size): don't crash in case of getpagesize error

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Signed-off-by: Andrea Terzolo <andrea.terzolo@polito.it>
Co-authored-by: Federico Di Pierro <nierro92@gmail.com>
This commit is contained in:
Andrea Terzolo 2022-09-20 15:16:29 +00:00 committed by poiana
parent b0b2f05eb5
commit 90e4634a79
1 changed files with 4 additions and 2 deletions
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6
userspace/falco/app_actions/compute_syscall_buffer_size.cpp
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@ -21,6 +21,7 @@ using namespace falco::app;
/* These indexes could change over the Falco releases. */ /* These indexes could change over the Falco releases. */
#define MIN_INDEX 1 #define MIN_INDEX 1
#define MAX_INDEX 10 #define MAX_INDEX 10
#define DEFAULT_BYTE_SIZE 1 << 23
application::run_result application::configure_syscall_buffer_size() application::run_result application::configure_syscall_buffer_size()
{ {
@ -39,7 +40,7 @@ application::run_result application::configure_syscall_buffer_size()
} }
/* Sizes from `1 MB` to `512 MB`. The index `0` is reserved, users cannot use it! */ /* Sizes from `1 MB` to `512 MB`. The index `0` is reserved, users cannot use it! */
std::vector<uint32_t> vect{0, 1 << 20, 1 << 21, 1 << 22, 1 << 23, 1 << 24, 1 << 25, 1 << 26, 1 << 27, 1 << 28, 1 << 29}; std::vector<uint32_t> vect{0, 1 << 20, 1 << 21, 1 << 22, DEFAULT_BYTE_SIZE, 1 << 24, 1 << 25, 1 << 26, 1 << 27, 1 << 28, 1 << 29};
uint64_t chosen_size = vect[index]; uint64_t chosen_size = vect[index];
@ -47,7 +48,8 @@ application::run_result application::configure_syscall_buffer_size()
long page_size = getpagesize(); long page_size = getpagesize();
if(page_size <= 0) if(page_size <= 0)
{ {
return run_result::fatal("\nUnable to get the system page size through 'getpagesize()'\n"); falco_logger::log(LOG_WARNING, "Unable to get the system page size through 'getpagesize()'. Try to use the default syscall buffer dimension: " + std::to_string(DEFAULT_BYTE_SIZE) + " bytes.\n");
return run_result::ok();
} }
/* Check if the chosen size is a multiple of the page size. */ /* Check if the chosen size is a multiple of the page size. */