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authorSiddhesh Poyarekar <siddhesh.poyarekar@gmail.com>2012-02-26 20:17:55 +0400
committerH. Peter Anvin <hpa@zytor.com>2012-02-27 00:59:04 +0400
commit42dfc43ee5999ac64284476ea0ac6c937587cf2b (patch)
tree4527353aa4f9cfedc09142f2a9da418c90b618e5 /drivers/net/ethernet/amd/atarilance.c
parentb01543dfe67bb1d191998e90d20534dc354de059 (diff)
downloadlinux-42dfc43ee5999ac64284476ea0ac6c937587cf2b.tar.xz
x86_64: Record stack pointer before task execution begins
task->thread.usersp is unusable immediately after a binary is exec()'d until it undergoes a context switch cycle. The start_thread() function called during execve() saves the stack pointer into pt_regs and into old_rsp, but fails to record it into task->thread.usersp. Because of this, KSTK_ESP(task) returns an incorrect value for a 64-bit program until the task is switched out and back in since switch_to swaps %rsp values in and out into task->thread.usersp. Signed-off-by: Siddhesh Poyarekar <siddhesh.poyarekar@gmail.com> Link: http://lkml.kernel.org/r/1330273075-2949-1-git-send-email-siddhesh.poyarekar@gmail.com Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'drivers/net/ethernet/amd/atarilance.c')
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